Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

Hp chevy bb will only run @ 40 degree timing at idle machine

Customer Question
shop engine dont have any...
hp chevy bb will only run @ 40 degree timing at idle machine shop engine dont have any spec
Submitted: 2 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 3 minutes by:
9/17/2015
Chevy Mechanic: Lou P., ASE Certified Technician replied 2 years ago
Lou P.
Lou P., ASE Certified Technician
Category: Chevy
Satisfied Customers: 5,083
Experience: building and driving chevy's since i was in the womb!!!! camaro and corvette enthusiest, access to factory diagrams and tsb's
Verified

Hello. It sounds like the balancer is bad or inaccurate for the engine. Can you give me some backstory on what was done to the engine before this happened ?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
new balancer ck tdc mark to tdc #1 piston
Chevy Mechanic: Lou P., ASE Certified Technician replied 2 years ago

Ok , so why did you replace the balancer ? Because of this ? How did this occur ? New engine ? And where is your number 1 plug located at ? And are you sure you have the correct number one cylinder with your timing light ?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
only thing that makes sense to me is timing chain off mark didnt build engine
Chevy Mechanic: Lou P., ASE Certified Technician replied 2 years ago

That could very well be , that's why I asked more info on the engine

Ask Your Own Chevy Question
Chevy Mechanic: Lou P., ASE Certified Technician replied 2 years ago

I suggest removing the spark plug for cylinder 1. Insert a long stick or 1/4" extension and crank the engine by hand until the extension stops moving to truly fint tdc and then see where the timing mark is at.

Ask Your Own Chevy Question
Customer reply replied 2 years ago
allready did that 0 the #1 piston is tdc this aint my first rodeo
Customer reply replied 2 years ago
even if the cam is degreed it still shoud not hae that much advance
Chevy Mechanic: Lou P., ASE Certified Technician replied 2 years ago

Hey man I am just trying to help you out. Why it would need to be 40 advanced to run we both know ain't right. I will opt out and see if another expert can help. I'm not sure where to go from here. My apologies. Lou

Ask Your Own Chevy Question
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,283
Experience: 15 years GM master tech
Verified

new expert here

a few questions for you when set to 40 degree's the engine will idle good and drive and perform just fine and shut off without dieseling and crank right back up no problem ? no pinging ?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
new engine not driven starts rough idle no run on when shut off restarts when warm
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

starts rough like the timing is too far advanced ?

and when set to 0 it will not run at all ?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
no
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

it really bothers me you need it at 40 degrees for it to run

the balancer is correct and the distributor is set in correctly

are you 100 % sure the valve are adjusted correctly ? ( i just want to be sure we are not compensating with the timing for an issue like tight valves )

what type distributor are you running ?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
msd pro billet with factory installed heavy springs no back fire dont think valves to tight
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

double check the valves if they are good do you have any access to a basic HEI distributor you can put in this engine and see if it will run when set at 0 degrees ?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
whats your theory on distributor
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

you have tried another distributor and it will run at 0 and allow you to set the timing and it will start up ?

it is either defective or somehow is retarding the timing when it should not be as you need to advance that one 40 degrees for it to run

is it tricked out somehow ? brand new ? used ?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
have not switched dist yet this is a mystery engine from some machine shop think chain off marks
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

i would try to switch out a basic HEI and see what it does before you pull the timing cover

if its fine with the HEI the distributor is the problem

if it still does the same thing and the valve's are adjusted correctly then the chain has to be off then pull the cover and see if it has a cam sprocket with different marks on it v/s the stock marks

if so either change it back to a stock double roller or try to set this one back to stock marks

Ask Your Own Chevy Question
Customer reply replied 2 years ago
thanks going on vacation get back with you next week
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

sure thing

you can always get me back through this post for FREE anytime with any follow up with this question anytime even after you rate us here at Justanswer !

Ask Your Own Chevy Question
Customer reply replied 2 years ago
i disagree with dist theory spark delivered 40 degree before piston comes up to tdc time light dont lie
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

40 degrees does not lie correct you don't have to agree or disagree with the theory at all either way

bot***** *****ne is this engine needs 40 degrees for it to run either physically or from the distributor itself

is it actually needing 40 degrees to run or is the distributor itself doing this ? we do not know

try another distributor to be sure

you are in the process of eliminating things at this point

if an HEI put in the engine and it does the same thing then pull the timing cover

Ask Your Own Chevy Question
Customer reply replied 2 years ago
back from vacation switched dist with stock gm hei pulled ft cover marks aligned when 1cyl tdc ck valve adjustment half turn after push rod play removed still idles best at 40 degress but still runs rough no back fire and no starter kick back please help thanks
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

at this point with an HEI only running best at 40 degree's you need to pull the timing cover and see if the timing chain is set degree'd or not

Ask Your Own Chevy Question
Customer reply replied 2 years ago
already pulled cover 1cyl tdc marks aligined
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

lets see if any other experts have any ideas

another expert will reply back to you

Ask Your Own Chevy Question
Customer reply replied 2 years ago
also did compression ck between 125-150 i know rings have not seated yet but seems low to me
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago
Mike S.
Mike S., Chevy Mechanic
Category: Chevy
Satisfied Customers: 7,645
Experience: ASE Certified Master Technician
Verified

is this a timing light that has the adjustment dial on it to measure advance?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
no old school t light
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

How did you set the distributor in?

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

I think you are a tooth off.

Ask Your Own Chevy Question
Customer reply replied 2 years ago
i can move dist from 0 to 60 degress
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

60 degrees at idle? There is only 180 degrees total and if you divide that by 8 for each cylinder that only leaves 22.5 degrees before the spark from the rotor would be jumping to the next distributor cap tower. That is why I asked you how you set the distributor in?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
it will idle at 30 - 60 retard past 30 engine stalls
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Try it this way. Remove the distributor. Turn the engine over and find when the #1 piston is coming up on tdc compression stroke again, then set the timing mark on the damper and timing mark at 0. Then set the distributor down in until it meshes with the cam gear and note where the #1 is on the cap and point it toward either the #1 cylinder like I like to do or point it straight forward like some other people like to do, then pull the distributor back out until the gear is free from the camshaft gear, so you can now turn the distributor until the rotor now faces just before where #1 was on the cap. Remember as you drop the distributor in the rotor will move as the gears mesh so it may take a few times. Then reach down and turn the oil pump with either a screwdriver or a special tool so the distributor can be dropped in exactly where you want it.

Then once the oil pump is turned the distributor will drop completely in and the rotor will be facing #1 and also the armature will be ready to fire also. Most people forget that last step.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Then static time the engine in order to get it started then time it with the timing light.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

To static time,

First of all you will need a test plug.

Get the #1 piston up on TDC on its compression stroke and align up with the timing mark, whatever base timing should be. Now remove the distributor cap and make sure the rotor is facing toward or at least close to #1 tower on the cap. Put cap back on. Make a test plug and remove the spark plug wire from #1 spark plug and insert the test plug into the end of the wire and ground the clip. Loosen the distributor hold-down bolt just enough so you can turn the distributor by hand. Now turn the ignition key to run, watch the test spark plug and quickly turn the distributor back and forth across where the rotor was facing #1 on the cap tower and look for a spark. Once you find where it sparks, stop. Tighten down the distributor a little, start the engine then time the engine.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

You can make a test plug with a new spark plug and some wire, a mini hose clamp and an alligator clip. First open the spark plug gap to around 0.075” and strip both ends of a 16 gauge wire about 4 foot in length. Attach the mini hose clamp around the threads of the spark plug cause that is a ground and secure it with the mini hose clamp with the bare wire end in between to make a good connection. Next, take the other end of wire and secure to an alligator clip.

Now, you have a test plug. Remove any spark plug boot you want and insert your test plug onto the spark plug wire end you just pulled off and ground the alligator clip. Lay the spark plug in some shade somewhere under that hood and then crank the engine and look for spark. It should crackle with sound and should be blue but red is ok, orange is a little weak. If it can jump that 0.075” gap you should have no problem igniting an engine.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

There, that should do it.

Ask Your Own Chevy Question
Customer reply replied 2 years ago
that makes no sense to me 2 different dist engine runs can move dist to timing is 0 or move 60
Customer reply replied 2 years ago
nothing wrong with 2 dist same result
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

What makes no sense, that the distributor can be in wrong?

I asked you how you set it in and you didn't answer.

I assumed then you didn't know how to set one in properly.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

When you removed the one distributor and set the other one in, I know it didn't just drop right in. You had to turn the oil pump.

I asked you how you dropped it in.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Ok, let's try another question.

I don't recall you ever saying what year this engine was

Is there a vacuum advance? If so, do you have the vacuum line going to ported or non-ported vacuum?

In other words, is there vacuum advance at idle or not? If not, try vacuum advance at idle so you can set the base timing back some.

If this isn't the case, I still think you need to either set the distributor down in correctly or at least tell me exactly how you did set it down so I know not to suspect that anymore.

Ask Your Own Chevy Question
Customer reply replied 2 years ago
had to move oil pump rod dist seated flush with intake do you have the story on this engine from the other 2 mech that gave up
Customer reply replied 2 years ago
never seen this in 30 yrs of working on engines
Customer reply replied 2 years ago
6in of vacum compression 130-150 pro comp alum heads 11-1 compression says 600 horse
Customer reply replied 2 years ago
1st dist msd pro billet mech advance 2nd dist gm factory hei vac not hooked up
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Yes, I read all of those other conversations.

Here is what I think is going on. You are a tooth off on setting the distributor in and what this is causing is the rotor may be facing #1 but the armature isn't facing where it is firing, so it is so far advanced it is firing at the next tower on the cap.

6 inches of vacuum where? At the intake manifold?

6 inches is really low.

Hook up the vacuum advance for the distributor to vacuum advance at idle.

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

No vacuum advance? So this has a computer?

Ask Your Own Chevy Question
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

Is this fuel injected? What year is this engine or at least close to what year?

Ask Your Own Chevy Question
Customer reply replied 2 years ago
this is a hp 70s 454 block 850 demon carb bore and stroked to 500 something
Chevy Mechanic: Mike S., Chevy Mechanic replied 2 years ago

try this. Move all of the spark plug wires on the cap one turn retarded and see what the timing mark is at now when it idles the best.

Ask Your Own Chevy Question
Customer reply replied 2 years ago
moving the wires or turning dist create the same result
Customer reply replied 2 years ago
the factory hei came out of a well running hp small block and cap was marked with firing order
Ask Mike S. Your Own Question
Mike S.
Mike S.
Mike S., Chevy Mechanic
Category: Chevy
Satisfied Customers: 7,645
7,645 Satisfied Customers
Experience: ASE Certified Master Technician

Mike S. is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,249 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

17,283 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,847 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,900 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,682 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
Pulled spark plug out and fuel came out with the plug.
pulled spark plug out and fuel came out with the plug. … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Misfire code p0306 I️ changer distributor cap spark plug and
Misfire code p0306 I️ changer distributor cap spark plug and wires new fuel pump don't understand why code is appearing … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
45 satisfied customers
A P1345 Chevrolet - Crankshaft Position-Camshaft Position
i AM GETTING A P1345 Chevrolet - Crankshaft Position-Camshaft Position FAULT on my 1996 Chevrolet Suburban 454 K25. Bad Timing chain? … read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,682 satisfied customers
Misfire in cylinder #1 replaced coil and spark plugs, engine
misfire in cylinder #1 replaced coil and spark plugs, engine light on and flashing. Put in injector cleaner also. … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Crank ok but won't start when hot, fuel 55psi,spark plug
when it cold start up no problem,i even replace coolant temp sensor… read more
Michael Solis
Michael Solis
261 satisfied customers
1 cylinder Spark Plugs crack and misfire. Random at first
1 cylinder Spark Plugs crack and misfire JA: How many miles are on the car? Is it a steady misfire? Or random? Customer: Random at first 79000 mjiles JA: What is the model/year of your Chevy? Customer… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Crank, no start. fuel pump is working. spark plugs (I think)
crank, no start. fuel pump is working. spark plugs (I think) are firing. … read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
290 satisfied customers
I'm trying to change the spark-plugs on my 2006 chevy
Hi,I'm trying to change the spark-plugs on my 2006 chevy Malibu,3.5 But I ran into a problem,a couple of the spark-plugs seem to be froze.they don't turn one bit.how can I get them out with out Breaki… read more
Eric
Eric
Auto Technician
589 satisfied customers
Second opinion] I'm trying to change the spark-plugs on my
Second opinion] Hi,I'm trying to change the spark-plugs on my 2006 chevy Malibu,3.5 But I ran into a problem,a couple of the spark-plugs seem to be froze.they don't turn one bit.how can I get them out… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
P0300 and P0480, 09 Chevy cobalt, Coil pack, spark plugs,
P0300 and P0480 JA: What is the model/year of your Chevy? Customer: 09 Chevy cobalt JA: Are you fixing your Cobalt yourself? What have you tried so far? Customer: Coil pack, spark plugs JA: How many m… read more
roy
roy
Associate Degree
3 satisfied customers
Changed spark plugs wires coil on 2002 chevy s10 4.3 v6. no
changed spark plugs wires coil on 2002 chevy s10 4.3 v6 . no spark to engine ? … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Hard starting. 1996 S10 4.3 vortec. New spark plugs, wires,
Yes.... New spark plugs, wires, distributor cap and rotor … read more
Mike S.
Mike S.
Chevy Mechanic
7,645 satisfied customers
Want to replace spark plugs 2012 chevy Malibu 2.4 ltr but
Want to replace spark plugs 2012 chevy Malibu 2.4 ltr but plastic cover over entire engine bay has me concerned how do I remove this cover to access plugs? … read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,682 satisfied customers
Misfire at idle changed egr valve and tube spark plugs and
Misfire at idle changed egr valve and tube spark plugs and wires got a p0455 code … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
No spark to my spark plugs, its a 1986, not sure exactly how
its a 1986, not sure exactly how many miles .... there is no spark to the plugs … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,913 satisfied customers
The check engine is on. I have changed all the spark plugs
Hi the check engine is on. I have changed all the spark plugs and core and ignition core. … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,249 satisfied customers
2009 spark plugs wet engine run rough loss of power. 41k
2009 spark plugs wet engine run rough loss of power. … read more
GM Bob
GM Bob
Automobile Technician
High School or GED
989 satisfied customers
Check engine light after spark plug replacment, Stays on,
Check engine light after spark plug replacment JA: Does the light stay on, or does it blink? Customer: Stays on JA: What is the model/year of your Chevy? Customer: 2010 Chevy cobalt 8500 miles JA: Are… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x