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1988 2.8 s10 idles rough and backfires out tb. replaced ignition module and spark control unit, coil, plugs and wires. No help.

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In a nutshell...Choke valve, linkage and fast idle cam must operate freely. A non-functioning idle stop solenoid (if equipped) could cause stalling or rough idle. The reason why is that it minimizes strain on starter and battery and reduces the possibility of backfiring when attempting to start the engine. Check to see if it is equipped with the above Solenoid and the other three items are in proper working order. If this doesn't help we go to the next steps.

Posted on Mar 29, 2015

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Posted on Jan 02, 2017

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SOURCE: 1991 Olds Bravada 4.3 v6 rough idle and backfiring.

Ok guys, let's fix these things here!
Just went through this myself, so do the following:
Go to your local parts store and buy a Haynes Repair Manual.
You need to read the book first, learn how the ECM (Electronic Control Module) works. You'll see that there are alot of sensors and components that make up the fuel emissions bologna.
The nice thing about this system is not only does the ECM control all electrical functions, it also trouble-shoots it's self. When a component or sensor goes out, the ECM stores a code for that event in it's memory. You can use the Haynes Repair Manual to put the ECM into diagnostic mode and thus read any codes present.
So, all that's left is replacing what the EMC tells you too! :) Good Luck!

Posted on Feb 06, 2009

  • 73 Answers

SOURCE: 1994 pontiac transport se not firing in first coil pack at idle

ARE YOU CHEKING SPARK OFF THE COIL TOWER OR AT THE SPARK PLUG END OF THE WIRE SOUNDS LIKE YO HAVE A BAD WIRE

Posted on Apr 24, 2009

  • 67 Answers

SOURCE: I have a 97 pontiac sunfire 2.4l it has no power

Liquid meaning water in cylinder #1? Blown head gasket.

Posted on Jul 27, 2010

  • 1915 Answers

SOURCE: 1988 Jeep Wrangler starting problems. I replaced

you are saying it is getting spark, and fuel, right? If it is getting spark, and fuel in to the throttle body, check compression-make sure the Mass Air Flow sensor is plugged in, and double check your spark-you say you replaced all those ignition items, but do not say that you have spark.

Posted on Jul 01, 2011

johnware43
  • 145 Answers

SOURCE: how to fix 2002 pt cruiser rough idling

Check on intake silicon gaskets, upper and lower. About $18 at autozone

Posted on Jun 22, 2012

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1988 pont 6000 quit and would't restart. Generates 42 code. I have shop manual. Flow chart led to ign. module or ecm. I replaced both. The car idled for 20 min. and quit.


I don't know liter size of engine? I don't know exactly what testing you have done? I need more info?
You have dis ignition? Engine cranking, do you have spark at the plugs, proper fuel pressure and fuel injector pulse?
The purple wire with white tracer from ignition module to computer has a dc pulse with engine cranking? With bypass ignition, engine cranking, it's the ignition module that controls spark, during cranking rpms. Did you check voltage and ground for ignition module. With dis ignition, there is a crank sensor? I'm not saying replace anything. I would have replaced the --spark plugs and plug wires, Possibly the ignition coils.
I just don't know exactly what testing you have done?
If you have already done everything I suggested, then, pardon my post. Just trying to help.

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1 Answer

Rough idle and loss of power 1988 s10 4.3


Did you test any of those parts before you replaced them ?
Have you checked the cap, coil, and distributor yet ?
The distributor has a module and a pickup coil inside that could be faulty.
Is the check engine light on ?

Oct 07, 2012 | Chevrolet S 10 Cars & Trucks

1 Answer

Ignition system and misfire codes. rough running and stalls at idle.


sounds like the ignition module.......it comes in 2 pieces, the coil assembly and the control module......you can measure with a resistance meter across the coils which should show about 7,000 ohms as an average....it will vary from different manufacturers......if you measure nothing or infinity, then the coil is open...replace only the coil assembly......if the coil assembly is fine then suspect the control module.....other than that, other faults could be intermittant crank shaft sensor signal, intermittant or broken spark plug wires.....broken or cracked spark plugs.....fouled plugs.....plugs that have excessive gaps, incorrectly installed wires...meaning incorrect firing order.....there could be many faults but i would check the coil assembly from your ignition module first before anything else...you'll probably find at least one of the 3 coils are open or infinite resistance......good luck

Nov 27, 2009 | 2000 Dodge Ram 1500 Truck

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2000 Chevy s10 2.2L very rough idle at low rpm


run a fuel pressure test, if that checks out fine it may be a faulty coil pack or ignition control module

Jul 28, 2009 | 2000 Chevrolet S-10

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1988 chevy corsica 6 cyl suddenly running on 4


WET PLUD W/GOOD COMPRESSION IS USUALLY NO SPARK.YOUR ENGINE HAS 3 IGNITION COILS.EACH COIL CONTROLS 2 SPARK PLUGS.TRACE THE WIRES FROM THE BAD SPUGS BACK TO THE COILS .IF THEY ARE THE SAME COIL THEN U HAVE A BAD ONE OR CONTROL MODULE(UNDER COIL)

May 12, 2009 | 1988 Chevrolet Corsica

1 Answer

1994 pontiac transport se not firing in first coil pack at idle


ARE YOU CHEKING SPARK OFF THE COIL TOWER OR AT THE SPARK PLUG END OF THE WIRE SOUNDS LIKE YO HAVE A BAD WIRE

Apr 24, 2009 | 1994 Pontiac Trans Sport

1 Answer

Backfires upon acceleration, idles smoothly


Check the list ....it may help


Engine misfires periodically =

Ignition coil layer shorted > Replace
Spark plugs fouling > Clean or install hotter type plug
Spark plug(s) insulator nose leaking > Replace
Fuel injector(s) defective > Replace
Powertrain control module faulty > Replace

Jul 15, 2008 | 1998 Isuzu Trooper

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