Shuts off radomly

[Tim]

This is a very anoying problem and I will evently just start repalcing parts to find the culpret but I will ask advance on where to start.  

My car will shut of randomly like it suddenly exactly like I turned the key off. The only times it will not die is if I am on the throttle. It has died on me coasting at 40 mph before. It will also die sitting in park. It always restarts. You never notice anything is wrong while it is running. Throws no codes or anthing. Just shuts off.  I thought it was something related to current draw so I drove around with no heat, stereo or anthing power related on and it still dies. Has anyone else experienced these syptoms?

I think it is the ignition module that is messed up but not sure.
What would happen if the fuel pressure regulator was screwed?
What would happen if the car was running to rich in the low end? What I mean is would the car die because there was too much fuel at low demand situations therfore killing the engine. But then wouldn't it throw a code?


New Parts
---Jeff M chip and crossover
----New injectors
----New Fuel pump
----wires and plugs 10,000 miles on
----all recommended changes my Jeff M
-----160 amp alternator (for stereo system)
----Car has only 95,000 miles


Thanks for any advice

[eclipse5302]

Well, where to start?

If the fuel pressure regualtor is bad, you could check by pulling the vac line off of it while the engine is running.  If you see/smell any fuel in the line or coming out of the regualtor, it's bad.  You could also check fuel pressure.  Should be around 43 while the engine is off and the fuel line is primed.   And about 5-7 psi lower after the engine is started.

As for it running too rich, I doubt it.  If it ran rich enough to cause the engine to quit, you'd probably smell gas and the car would run like crap.  And it should throw a O2 sensor code (but not always).

Things to check would be:

-Ignition control module (probably just replace, these are prone to being bad)

-Coils (check continuity, measure resistance--should be around 12 ohms and the 3 coils should be around the same measurement.)

-Crank position sensor (just replace it, if it's never been replaced and it's not bad now it will be soon)

-ECM grounds (remove/clean with wirebrush-check for corrosion)

-Bad lower engine mount (causes a ground loop--look for grease/oil in the engine mount cup)

-ECM faulty (bad connections inside, tap with hammer lightly with engine running and see if it quits)

-Stoplamp switch (there was I recall on these I think, and if the car dies usually when you are on the brakes then it could be this)

-IAC valve (remove, clean carbon from inside of TB and IAC valve)

Check/replace this stuff first.  This stuff makes up most of the normal TGP problems.  There are other things, but this is a good start.  Maybe someone else has something to add?

Jason

[Tim]

:D Thanks for the help it ended up being the crank position sensor. However I went through the entire list you gave me and all passed, except you said that the coil resistance was supposed to be 12 ohm?  :? My manual said that the primary was supposed to be .5 to .9 and secondary from 5000 to 10000 ohms. Which is correct or am I getting something confused. I replaced the module and the coils with a spare orginal set that I knew did not have the problems I was trying to solve anyway. All the coils had a .5 ohm primary and 6,000 secondary.

Could the coils with those values cause a small puff of black smoke when I first get on the throttle? Because I had some one follow me home to get it fixed and back and before and after the fix it has a black puff of smoke just when I initially get on the throttle. (I have new ingectors and I checked the FPR) I am assuming this puff is unburned fuel. Have you ever heard of the orginal sparkplugs srewing up in 15000 miles? I took one out to look at it and it does not look like it has any build up what so ever on it. I thought maybe the plugs got screwed from the crank sensor being bad.


Thanks in advance

[eclipse5302]

Yeah, I was wrong on the value for the coils....was thinking injector values.  They (secondary) should be around 5k-10k ohms.  The important thing here is that they are close to each other in value.  

And the smoke is OK as long as you're getting on it hard.  If it smokes like that all the time, then theres another issue.  But if it's only under hard accel, then you're probably OK.

Jason