Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

rough idle 1989 chevy s10 blazer stalls at red light

Customer Question
rough idle 1989 chevy s10 blazer stalls at red light
Submitted: 7 years ago.Category: Chevy
Ask Your Own Chevy Question
Answered in 16 minutes by:
7/29/2010
Chevy Mechanic: John, Master A.S.E Automotive technician replied 7 years ago
John
John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9,176
Experience: A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
Verified

Hello & Welcome to JA,

 

This problem can be a faulty ignition switch ,make sure you are not losing voltage from the switch to the coil & module when this happens.

The problem can also be a faulty ignition coil,module,or distributor pick up coil.All these parts can be tested but if the problem is intermitten it may show good when tested.

Make sure you are not losing fuel pressure when this happens.If it is hard to restart & spraying carb cleaner in the intake will start it for a short period ,you have a fuel pump problem most likely.

John
John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9,176
Experience: A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
Verified
John and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 7 years ago

I replaced the coil and just put this engine in. The old engine was doing the same thing but i thought that it had to much cam. This engine is stock and has the same problem.

I repaced the engine wire harness and did ohm test on every wire on the harness before I put it in have also replaced the ecm. i have no check engine light until it stalls.when i run the codes i get a 33 and no others.I had this engine balanced and blue printed at houston engine and balance.lots of money invested.I went to have state insection and they said to much unburn fuel in the exhast at slow speed but fine at higher speed. PLEASE help.

Carl

Customer reply replied 7 years ago
It starts right back up after stall and runs down the road great plenty of power
Chevy Mechanic: John, Master A.S.E Automotive technician replied 7 years ago
OK,I suggest setting the minimum air rate (idle speed ) & replacing the Idle Air Control valve on the TBI.This is done by blocking the IAC passage at the TBI & setting the idle speed screw to 550 RPM.This condition is also caused by a faulty pick up coil in the distributor.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
This TBI has the idle screw adj blocked so you cant adj. I just replaced the distributor with a brand new one complete shaft and all. when I look in the air port I can see the IAC move in and out. As the idle gets low and rough the the IAC moves back and the idle increases then it moves back in and the idle gets rough agian.this only happens in gear with brake on or E brake on so I dont think its a bad brake booster.Do you think I should remove the solder and adj the Idle screw. The TBI has new injectors and all new gaskets.When I remove the neg cable and clear the codes the 33 code stays gone unless I let the engine completely stall.
Chevy Mechanic: John, Master A.S.E Automotive technician replied 7 years ago
ALL screws on GM TBI units are factory sealed ,sometimes due to wear,it is necessary to remove the factory plug & adjust.Make sure the TPS voltage is stable (not jumping around) & is around .50MV.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
I have it set to.51MV and its stable at WOT its 4.70MV I will try this if it works I will pay again thank you very much.
Chevy Mechanic: John, Master A.S.E Automotive technician replied 7 years ago
You are very welcome,have a good day.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
Right back to the same old thing rough idle and stall.It seemed to idle fine the I test drove it and it was back to the same. Im at wits end.
Chevy Mechanic: John, Master A.S.E Automotive technician replied 7 years ago
look at the fuel trim #s ,they should be 128 in closed loop.Check for vac leaks at the intake manifold.
Ask Your Own Chevy Question
Ask John Your Own Question
John
John
John, Master A.S.E Automotive technician
Category: Chevy
Satisfied Customers: 9,176
9,176 Satisfied Customers
Experience: A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

John 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

9,196 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

9,176 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
The engine and traction control lights are on, and there is
The engine and traction control lights are on, and there is a "service traction" message on my 2011 Malibu. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
I have a 2011 Chevy Equinox. A check engine light came on
I have a 2011 Chevy Equinox. A check engine light came on and the Stabiltrak light. Eventually just the check engine light stayed on. I took it to the dealer to have it checked along with an oil chang… read more
Eric
Eric
Auto Technician
589 satisfied customers
My check engine light has been on for awhile and I've taken
My check engine light has been on for awhile and I've taken it to my mechanic several times and we've fixed a few things. They said I might need to replace my spark plugs. My check engine light began … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Have had an engine light come on which sent a code that the
Have had an engine light come on which sent a code that the no 7 cylinder misfired. I cleared this code and it ran OK for awhile. Yesterday the traction control light came on and the engine light came… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
86 K10 temp. gauge goes to hot and engine dies, but engine
86 K10 temp. gauge goes to hot and engine dies, but engine is still cool … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
1996 chevy Silverado k2500 5.7 vortec engine engine light on
1996 chevy Silverado k2500 5.7 vortec engine engine light on po300 random misfire detected we replaced plugs wires Distributor cap and rotor pickup coil checked compression everything is good there ch… read more
Michael Solis
Michael Solis
241 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
It will not start the engine will turn fine but will not
It will not start the engine will turn fine but will not start i replaced the fuel pump but it made no difference i also tried changing the fuel pump relay but that did nothing … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
My service engine light came on. at 1st it was just
my service engine light came on. at 1st it was just flashing. Now its a on steady. I just had a oil change and radiator service … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,196 satisfied customers
Wash engine but do not start engine. Its ok. Everything is
wash engine but do not start engine JA: Have you checked the battery, particularly the terminal connections? Are they corroded? Customer: Yes its ok JA: What is the model/year of your Chevy? Customer:… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
We have changed the ignition coil and the fuel control
we have changed the ignition coil and the fuel control module and still have no fire. … read more
roy
roy
Associate Degree
3 satisfied customers
I got a crate engine 10066038 in back of the engine i says
i got a crate engine 10066038 in back of the engine i says im0918 6vp can you tell me more about this engine? … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Have a 2009 HHR, 2.4 L engine. Check engine light came on,
Have a 2009 HHR, 2.4 L engine. Check engine light came on, had scanned at AutoZone. Code P0010, with definition: intake camshaft position actuator solenoid, control circuit bank 1. Explanation:ECM has… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
Check Engine light flashing and engine seems to loose power.
Check Engine light flashing and engine seems to loose power. Also Trac light comes on. After a few seconds it all resets. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Changed 1500 ignition coil connector and fuel pump was
changed 1500 ignition coil connector and fuel pump was perfect now dies after 20 sec seems like another wire somewhere is not giving juice to pump … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,196 satisfied customers
How much does an ignition coil cost to replace. Please send
How much does an ignition coil cost to replace. JA: I'm not sure of the exact price, but there's only a $5 deposit. The rest of the price information will be on the page I send you to. Customer: Pleas… read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,682 satisfied customers
No spark from ignition coil. Batty good new coil plugs
yes fixing my self also new fuel pump i think its a el … read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
I replace the ignition coil and nothing fires, I put the old
I put the old one back on it fires and misfires on cylinder 2 an 3 … read more
kwiggins29059
kwiggins29059
Associate Degree
219 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