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1990 Chevy Lumina Stalled & Won't Start.


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allthatufear
05-02-2007, 09:39 AM
The Car stalled while on the way home. At first we thought it could be not getting enough spark, so we took out the Coil Pack as its called. Brought it to get tested and they told me the 2 coils needed to be replaced but the ignition module that they sit on was ok. So we get home and put on the new coils and everything and still nothing. It seems to be getting gas cause we can see it in the throttle body. Heck we even tryed to pour fuel directly in the throttle body and use starter fluid but didn't work. I was told to check out the ignition fuse and see if its ok, and it is. We took out the spark plugs and they seem to be bone dry, and this is after we try to crank it numerous times. Just confused as to what to do next, we was also told to check out the timing chain, and to do that is take out a spark plug and try to crank it and see if you can feel pressure, well we felt pressure. So we have no clue, cause its getting spark & pressure.

Thanks for anyone willing to help....im so confused.

LMP
05-02-2007, 11:37 AM
Just to clarify a few things and lead others into helping....you say you are getting spark.....I suppose you actually pulled a spark plug wire and install a spare spark plug in the open and see it spark while you start?...By the way, what engine is this?...2 coils, then the 2.5 four cylinder, right? That is an overhead cam...what mileage? When was the timing belt changed last time? I would definitely check that item. NOw..these are generic things, I do not have specific experience with that very engine (well, except in an 80 vintage Jeep Cherokee) but anyway it needs fuel, spark and timing...so!

richtazz
05-02-2007, 11:57 AM
Since you're not getting spark (it would fire with gas/starter fluid if it did) then my first guess is a bad CKPS (crank position sensor) or the wiring between it and the ignition module (if it's a V-6, the 4-cyl CKPS is mounted to the botton of the ICM bracket). When you took the ICM to be tested, did they run the test more than once to get it warm? If not, it could still be faulty if the CKPS checks out.

allthatufear
05-02-2007, 01:37 PM
LMP you got it right, it is a 2.5, 4 cylinder. And we have tryed the spark plug thing..and its a good spark. the mileage i don't know a 100 percent, but its in the upwards of 230k. The last time the belt was changed, i don't know....the car was given to us and we have had it almost a year..

richtazz, its funny you say that, cause i talked to my brother also who is a ASE mechanic and he said he thinks its a crank postion sensor too...or the wiring could be frayed or melted...so we defiently will check that. Thanks guys. By the way, i keep also hearing i should change the Fuel filter, would that hinder the cranking? Cause we did buy a new one...so we will try that too, by the way what is the normal pressure for fuel? Cause we are going to check the pressure next and just wanted to know the benchmark for the pressure.

Thanks everyone,
Justin

allthatufear
05-03-2007, 07:50 AM
I think today we are gonna try out a few things...and if none of those work we are gonna go after the crank postion sensor.

richtazz
05-03-2007, 12:18 PM
If you have spark, then it's not the crank sensor. Your engine doesn't have a timing chain, it has gear to gear drive, and the cam gear is made from a phenolic (plastic like) material. When they get high in mielage, this engine is famous for jumping time/cracking the cam gear. You may want to check and see if the valve train is moving as you crank the engine, as you may have a broken timing gear set.

allthatufear
05-04-2007, 03:19 PM
Well the valve is not moving, nor are we getting any pressure from the muffler. I was also told by my brother who is a ASE mechanic that the timing is gears not chains. But i called auto place and they told me that its a chain and blah blah blah. With it being gears i've been told the whole motor needs to be removed in order to work on it. Is this true? Should we throw in the towel?

john51md
05-05-2007, 04:51 AM
Well the valve is not moving, nor are we getting any pressure from the muffler. I was also told by my brother who is a ASE mechanic that the timing is gears not chains. But i called auto place and they told me that its a chain and blah blah blah. With it being gears i've been told the whole motor needs to be removed in order to work on it. Is this true? Should we throw in the towel?

Just to clarify about a 2.5 ... my 91 2.5 indeed has a timing chain and tensioner just like the V6's. I know they previously had just gears but i dont know when they changed to a chain.so yours may or may not. But i cannot see how replacing a gear drive in the car could be much differernt than doing a chain in the car as you still have to remove and replace both gears and chain in a chain driven engine.

Also, a 2.5 is not a overhead cam engine, its a overhead valve engine.

I replaced the chain in mine in the car, and it was fairly easy job to do. Some work done from above, some thru wheel well opening.

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