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92 LeSabre 3.8L Will Not Start


tinkering
11-23-2012, 07:46 PM
This engine has been doing all kinds of things. A few people have worked on it, and have changed some parts including the ignition module, cam sensor, crank sensor maybe? The initial problem was intermittent stalling. A while after the under dash ECM was replaced it lost it's power, and started to stall intermittently again. Yesterday it wouldn't start at all. I changed the fuel filter (horrible hidden location); it hadn't been changed for quite some time; hard to blow through it (I was planning on changing it before it decided not to run at all). Whats the best way to check for spark on that baby? Please help me with ideers. :runaround:

maxwedge
11-23-2012, 08:13 PM
Spray carb cleaner into the intake if it starts you have spark, if not no fuel pressure or injector pulse. Post back results,

tinkering
11-24-2012, 12:42 PM
Spray carb cleaner into the intake if it starts you have spark, if not no fuel pressure or injector pulse. Post back results,
Do you mean undo the air intake (that comes from the air cleaner) from the throttle body, and then spray carb cleaner into the air horn while turning the engine over?

maxwedge
11-24-2012, 03:19 PM
Yes.

tinkering
11-28-2012, 05:37 PM
Spray carb cleaner into the intake if it starts you have spark, if not no fuel pressure or injector pulse. Post back results,

It did not fire when spraying carb cleaner into the air intake.

Is it still OK to pull a plug wire to physically check for spark to ground? Is it still feasible to pull a plug and ground it, to check for spark when turning over? Someone told me these old ways of checking spark will damage the IC Module or something... or was that just pertaining to pulling the coil wire to check for spark or...? What is the bottom line on that?

What is the best next step now that it doesn't seem to be fuel related?

maxwedge
11-28-2012, 09:33 PM
Pull a plug wire , you should see a strong blue spark to ground across a 1/4 inch gap, careful not to get zapped.

tinkering
11-29-2012, 11:53 AM
Pull a plug wire , you should see a strong blue spark to ground across a 1/4 inch gap, careful not to get zapped.

If it does not have a good spark, what is the first thing to suspect?

maxwedge
11-29-2012, 04:15 PM
No spark: bad module, wiring from crank sensor to module or bad crank sensor, are the most common causes.

tinkering
11-29-2012, 04:45 PM
No spark: bad module, wiring from crank sensor to module or bad crank sensor, are the most common causes.
You mean the Electronic Ignition Control Module right?... not the computer

maxwedge
11-29-2012, 07:32 PM
Correct, ign control mod, make sure you have 12v to it on the pink wire.

tinkering
12-07-2012, 12:52 AM
The thing runs intermittently. It started up today and ran for many miles of road test. It then started to stall more and more. What is the most likely component here? I don't have a code scanner, so someone else will have to do that for us. Should I just go to pick and pull, and pull every sensor and control I can see, and just go on a replacement binge? :confused::lol2: What all is in that system... MAP sensor, oxygen sensor, Throttle Position Sensor...? Will the Electronic Ignition Control Module cause an intermittent condition like this? Are there some online diagrams showing locations of all of these components?

GAnOhio
12-07-2012, 07:56 AM
My 2000 Lesabre would just simply die after it was warmed up. It was not the same as a miss. Idled poorly or stumble during acceleration too.
I noticed one time at idle that it would "stumble" when I tapped on the MAF sensor (but, not every time).
Replaced the MAF sensor ($130) and now it runs fine.

maxwedge
12-07-2012, 09:23 AM
Sounds like intermittent no spark, have the ign control module tested, napa used to do them, crank sensor would be the next suspect. The 2000 Le S will run in default with a bad maf, the 92 will not.

Tech II
12-07-2012, 12:13 PM
There are any number of things that can cause your problem......

Does this stumble under a load or also while idling?

You don't need a scan tool to read codes.....

http://www.troublecodes.net/GM/

Jumper A to B then turn key to on, don't start.....

Do you know how to read flash codes?

Does this vehicle have one coil or three individual coils?

I recommend You check for spark at each cylinder with a spark tester, which will put a load on each cylinder.....

Another thing to try is disconnect your MAF and see if it runs better.....

tinkering
01-14-2013, 09:10 AM
There are any number of things that can cause your problem......

Does this stumble under a load or also while idling?

You don't need a scan tool to read codes.....

http://www.troublecodes.net/GM/

Jumper A to B then turn key to on, don't start.....

Do you know how to read flash codes?

Does this vehicle have one coil or three individual coils?

I recommend You check for spark at each cylinder with a spark tester, which will put a load on each cylinder.....

Another thing to try is disconnect your MAF and see if it runs better.....

-It also stumbled and/or simply died while idling.
-Jumper A to B where, on the diagnostic connector somewhere? Where/how would you read the 'flash codes'? What a great thing to know.
-It has 3 coils I believe.
-How much are $park testers?
-I never thought of disconnecting the MAF as a way to test it.
One fellow tried a used MAF in there; it didn't change the problem at all. This same guy changed just about all of the other sensors. He figured it might be the internal part of the cam sensor (which would require a fairly major tear down, making it financially unfeasible to proceed considering the age of the thing).

-This same guy had replaced the under dash computer with one from the wreckers. We recently took a gamble and purchased a new computer from the AP store; it was worth trying as it was only $100.00. It seems to have solved the problem; heavy on the seems. We have to run it for awhile a few more times before I am sold on that one but it seems that way at present.

Thanks to everyone so far!

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