Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

1989 Chevrolet: K2500..TBI injectors are not cycling, what

Customer Question
1989 Chevrolet K2500 Truck Dead...
1989 Chevrolet K2500 Truck Dead, TBI injectors are not cycling, what could be a control that is not working?
Submitted: 6 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 5 minutes by:
1/21/2011
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago
Tim's Auto Repair
Category: Chevy
Satisfied Customers: 16,161
Experience: Have owned a repair shop for 25 yrs.
Verified

hi

first,you may want to replace the ignition module again,,,,,but,i would think your problem is the pick-up coil inside the distributer,,,the reason you don't get an injector pulse is because the computer doesn't know the engine is turning,,,,if the pick-up is bad,you may consider replacing the complete distributer sense the distributer will need to come apart to replace it

thanks

 

Typical Distributor Components

Ask Your Own Chevy Question
Customer reply replied 6 years ago
should there be voltage going back to the ECM from the Ignition Module? I still have spark.
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

yes,,you can have a spark and still not have a injector pulse sometimes.......i would lean toward the pick-up on this one,,but,,if the module is new,and if you can return it,try this first because it is easy and is a possibility

thanks

 

Distributor Operation

 

Typical Distributor Components

Purpose:
The distributor distributes high voltage to the spark plugs to ignite the compressed air fuel mixture in the cylinders.

Operation:
The distributor has a separate coil which connects to the rotor through a high tension wire.

The distributor uses a magnetic pick-up assembly located inside the distributor consists of a permanent magnet, a pole piece with internal teeth, and a pick-up coil. When the teeth of the timer core, rotating inside the pole piece, line up with the teeth of the pole piece, an induced voltage in the pick-up coil signals the electronic module to trigger the coil primary circuit. The primary current decreases and a high voltage of 35,000 volts is induced in the ignition coil secondary winding which is directed through the rotor and secondary leads to fire the spark plugs. The capacitor in the distributor is for radio noise suppression.

This distributor also features a longer spark duration, made possible by the higher amount of energy that is stored in the coil. This is desirable for firing leaner mixtures.

Location:
The distributor is located in the top rear of engine.

Distributor Reference Signal

PURPOSE
The distributor reference signal provides the control module with both engine RPM and crankshaft position information. This enables the control module to operate the fuel pump relay and energize the fuel injector.

OPERATION
When the engine is cranking or running the control module receives Distributor Ignition (DI) reference pulses from the ignition module. If the wire becomes open or grounded the engine will not run, as the control module will not operate the injector.

Testing and Inspection

 

Fig. 4 Pickup coil test connections

 

Note Make sure the ignition switch is "OFF".
  1. Remove distributor cap.
  2. Disconnect pickup coil connector from IC module.
  3. Connect ohmmeter as shown in step 1, and flex pickup coil leads while observing meter. Meter should indicate infinite resistance at all times. If not, pickup coil is defective.
  4. Connect ohmmeter as shown in step 2, and flex pickup coil leads while observing meter. Meter reading should remain constant between 500 and 1500 ohms. If not, replace pickup coil.
Note To replace the coil, remove the distributor.

ignition module

Description and Operation

PURPOSE
The distributor reference signal provides the control module with both engine RPM and crankshaft position information. This enables the control module to operate the fuel pump relay and energize the fuel injector.

OPERATION
When the engine is cranking or running the control module receives Distributor Ignition (DI) reference pulses from the ignition module. If the wire becomes open or grounded the engine will not run, as the control module will not operate the injector.

Tim's Auto Repair
Category: Chevy
Satisfied Customers: 16,161
Experience: Have owned a repair shop for 25 yrs.
Verified
Tim's Auto Repair and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 6 years ago
Thank you, XXXXX XXXXX I am going to opt for a new distributor. With all the other new parts installed what the heck! Going to be my daughters birthday present at 16 in 6 months want it to be dependable. Again Thank You, Rafe
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

thanks Rafe

yes,a rebuilt unit will be just as cheap as the pick-up sense it will take more work..

tell your daughter happy birthday and god bless..

thanks for using just answer

Ask Your Own Chevy Question
Ask Tim's Auto Repair Your Own Question
Tim's Auto Repair
Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 16,161
16,161 Satisfied Customers
Experience: Have owned a repair shop for 25 yrs.

Tim's Auto Repair 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

15,289 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

16,161 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

2,918 satisfied customers

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

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
I already change the spark plugs and wires on a Malibu 2003
I already change the spark plugs and wires on a Malibu 2003 Chevy it won't start … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
Won't start, get spark from the spark plugs, have put gas in
won't start, get spark from the spark plugs, have put gas in the intact still won't start. Starter is turning all the belts … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
2014 Chevy Silverado 4.3 cylinder two misfire a spark plug
2014 Chevy Silverado 4.3 cylinder two misfire a spark plug is looks like it's wet with gasolineAlso engine code P0106… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
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
55 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
363 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
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
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
293 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
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
15,289 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
9,357 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
1,002 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
2,734 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