http://www.wellsve.com/ Diagnosis and repair GM Type I ignition system. Learn how to check the coil and replace the module…the right way. How a bad coil ca…
GM Type I Ignition System Troubleshooting, Diagnosis and Repair by Wells EM
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Yea it looks pretty crusty, but no it was not.
Mark Hicks
Wells Vehicle Electronics
Was this car under 5 ft of water at a time?
Thank you. I will def. look into that.
It is very common on your vehicle for the catalytic convertors to cause this issue. Have the back pressure in the exhaust tested, if it is OK let me know and we can go from there.
Mark Hicks
Wells Vehicle Electronics
I have an 05 Impala SS that frequently misses under load. I replaced the coils the injectors plugs wires mass air sensor still does it. basically it bogs down and the CE light flashes a while usually while trying to get on the highway or when passing I have to drop from OD to drive and get the RPMs up to keep it from happening. Any suggestions?
I can’t answer this question. It all depends upon your experience. I would say if you feel some what comfortable, go for it! It is by far no impossible for a do it yourselfer.
Mark Hicks
Wells Vehicle Electronics
I’m having this problem now can I replace it or have my mechanic do it
Most common to cause this type of backfire on your vehicle is the ignition control module and coil. The crankshaft position sensor and timing chain have also been known to cause this. Please let me know if you have any further questions or what you find as the cause.
Mark Hicks
Wells Vehicle Electronics
it is a 1989 olds 98 regency brougham.3800 series motor. i have have replaced the pugs and wires. when the engine is put under sudden load it backfires though the intake.
Do you mean the Ignition Control Module or how it is connected? If yes, yes it could cause an engine to backfire through the intake. However, there are several reasons an engine would do this. What is the year, make, model and engine size of your vehicle and what is it doing? Maybe I can help you.
Mark Hicks
Wells Vehicle Electronics
can this part cause backfire thought the intake manifold?
A little anti-corrosion grease would not hurt anything. Remember this is the grounding point for the control module, too much could interfere.
Thanks for the great question!
Mark Hicks
Wells Vehicle Electronics
Wouldn’t it be a good idea to use the DI grease on the base to guard against future corrosion?
The music does get better in later videos :). Glad you liked the video.
Mark Hicks
Wells Vehicle Electronics
We don’t really need the music, but thanks for the video.
I’m wanting to turn crank 360degrees and reinstall the dist n try again am I on the right track, missing something, is there a stock advanced timing degree ..had the car for a week minimal time to play so far any info is helpful currently w piston at tdc 0 degrees and rotor is exactly at #1 cyl. Exhaust or comp.. I dunno, getting fuel plenty of battery (brand spankin new). Only car I have can’t borrow gf car forever nor do I wanna drive work truck everywhere
I have no start on my 2.8 firebird new dist cap rotor plugs wires. Still learning. How do I know I have #1 on tdc on compression stroke I inherited this and its prob hope previous owner didn’t put dist at tdc on #1 on exhaust stroke getn fuel I can smell it I’m thinkin of getn a new coil but wont make a difference if its installed on exhaust right help?
if you look on my channel my 99 s10 4.3 starts then stalls three minutes after running any help would be apreciated
Check the primary winding between terminal A and D, 1.2 to 1.5 Ohms. Check secondary between terminals A and the secondary terminal ( where the high voltage wire connects) 9040 and 13,560 Ohms. Check the internal noise suppressor between terminals B and D, about 2,200 ohms.
Hope this helps,
Mark Hicks
Wells Vehicle Electronics
I wish you the best in your new career. I am sure while you are learning you will have mnay questions. Stay in touch, I am happy to help.
Mark Hicks
Wells Vehicle Electronics
Oh, right, so you have the 3 plugs on your coil. mine is cylindrical on my accord. From my haynes manual, it has the different connections labelled as A, B, C, D, and the one connected to the distributor is a high “something”. So you test your pos and neg multimeter to A and D for your primary resistance, then A and the “High something” as your secondary resistance. then you measure the resistance between B and D, take the readings, and compare to what’s in your manual.
That’s off topic though 😛 I’m getting into the automotive course at the university in town. I’m still new at the stuff but I’m learning as I go. I just got a new car that stutters when put in gear, and dies. It’s hard to start the engine. It turns over, but it doesn’t start, 95% of the time.I have to disconnect the IAC to start it. In the process of troubleshooting, I tested the resistances in the ignition coil. I found pretty much the same results as you did for this vid.(different coil)
I have an 88 Honda Accord EX-i, automatic. I have some issues with the car starting,as in it doesn’t.. didn’t. I changed the fast idle valve last night, seemed to work with the eacv(e(missions?)..air control valve, or Idle Air Control Valve) connected. Normally I have to disconnect the eacv to start my car. it controls the idle air intake when the engine has a load put on it. With a higher load, the idle will lower,so iacv kicks in and increases the amount of air to the engine, raising idle
Guess you are going to have to help me. Dont know what the b-d or EACV are? Are you saying it dies when you put a load on the engine? What is the year, make, model and engine size?
Mark Hicks
Wells Vehicle Electronics
Very good!
Mark Hicks
Wells vehicle Electronics
mechanic’s left handed. 😉 southpaws rule!
interesting vid. my coil has pretty much the same readings. primary’s too low(analog multimetre) secondary’s on track, but the b-d is on track too. Pretty sure I need to replace my coil. My engine doesn’t start with the EACV on, and when it has load after it’s started, it just wants to die.
mechanic’s left handed. 😉 southpaws rule!
No the potting material should not be sticky or soft. It sounds like the coil or ICM or both have become very hot. This usually means high secondary resistance. Like defective ignition wires or spark plugs. It could also mean a poor ground contact, excessive AC voltage etc.
Please let me know if you can not find the cause.
Mark Hicks
Wells Vehicle Electronics
Good point that is definitely something to watch out for.
Mark Hicks
Wells Vehicle Electronics
i have a similar engine in my 87 bonneville. the coil tower devolped a pin hole and was leaking spark which was grounding out the cylinder. car ran very poorly. replaced coil, problem fixed
If you are talking about the epoxy inside the ICM, the answer is no. It should be solid and not sticky. If it is soft it means the ICM has overheated.
Mark
should the icm be stick and soft with the coil off ???
should the icm be stick and soft with the coil off ???
It is hard to say what it is without seeing the green substance. But it does sound like the ICM is getting hot. Before you replace the ICM, be sure to check the plugs, wires and coil for high resistance. You will also want to check the ground for the ICM. These ICMs ground through the mounting studs. Also check the ICM mounting bracket where it meets the head or block.
Mark Hicks
Wells Vehicle Electronics
Thanks for this I recently pulled my coil pack off the icm and had a massive amount of green goo that is extremely sticky. It was holding the coil and icm together and had gotten into the connection on the yellow lead. Upon cleaning it up a bit, cutting back the yellow wire and crimping on a new connector. I installed a new coil pack. And the problem remained. Is the green tar like stuff melted off the icm?
At this time I would not be concerned with the codes. The transmission codes could be caused by the misfire. If you have a timing light (if you dont I think you can borrow one from AutoZone) attach it to each one of the ignition wires to see if it flashes. If you find a cylinder or two that do not flash the light consistently, those are the cylinders that are misfiring. Watch the video on type two diagnostics, I will attached it to this video.
Stay in touch,]
Mark Hicks
@markhicks this is the same vehicle, but my question is does the icm have anything to do with the peak in rpm’s? this only happens in park or neutral. aslot i can heare the mufflers back fire
Is this one or two different vehicles we are talking about?
From your description if it is the same vehicle, I would first look at the catalytic converter and timing chain. By a certain RPM I am thinking you mean a low RPM. If you are saying it wont go over 5000 RPM it may be there is a rev limiter built into the computer system.
Mark Hicks
Wells Vehicle Electronics
is puttering at low acceleration a icm problem, and also when my 95 olds 88 is in park or drive the car only revs to a certian point please help
@markhicks markhicks
1. Check module control of the coil by back probing the White wire with the test light to Battery Positive Voltage (B+). If the test light will not flash on and off, while cranking the engine check the ignition control module (ICM) and pickup coil.
2. Check the output of the pickup coil; should be at least 750 mv with the engine cranking, using an AC voltmeter.
3. If the output is good replace ICM
Stay in touch,
Mark Hicks
Wells Vehicle Electronics
i have a 1994 chevy silverado 4.3 and when its hot sometimes it wont start and ive checked and it doesnt have spark..but if you let it set awhile it will start..any ideas?