stall at stop

[barbied]

92 3.1 with 205000 on her.
Any ideas?
A few weeks ago I had the crankshaft sensor replaced. Car would turn over but not fire. Sometimes if I waited 25 mn, it would start up with a overpowering gas smell. It seems that the problem would intensify after I filled with gas. So at fills I am now adding heet. (minnesota!!)
The fuel pump would work because you could hear it.
Now today after I filled up with gas again, I can start car, but when I approach a stop she dies. If I can get it into neutral, I can idle, or come to astop and she will idle, but when I step on the gas it kills.
So far it starts up ok after it dies, but I have to race engine and shift quickly.
What can I do oo? I believe I had this problem before, but for the life of me I cant remember what the problem was.
Thanks all!

[onstar]

205000 miles on her huh?

[barbied]

yeah - cant afford a different car right now so I got to keep her going...

[richtazz]

you have a weak fuel pressure regulator. The diaphram probably has a small pinhole or tear in it, and is allowing fuel pressure to bleed off. It's a relatively easy part to change and only costs about $40 or so. Common problem on 88-93 2.8/3.1 v-6's

[barbied]

I'll check it out. It seems if I keep speed under 25 miles per hour I dont have problem over 25 she dies at stop.
Ill look in my chiltons for how to replace and let ya know..

[barbied]

found out it was a dirty throttle plate - too much oil even though the dipstick didnt show too much
Got the oil changed added a little tranny fluid cleaned the trottle plate - whala - runs great.

[jon95se]

still check out the fuel pressure regulator. take the vacuum line off of it and if any gas in it, it is bad.
check the idle air controller. that could be sticky. and one last thing is could be torque converter lockout switch, depending on the transmission.

i feel your pain. i live in minnesota as well.

[barbied]

any trick to taking of manifiold intake to get to these other parts or do i not need to do that?

[jon95se]

i believe you only have to do that for the fuel regulator. the idle air controller is right along the air intake. and the torque converter lockout is down on the top of the transmission.

[barbied]

Crap. Now it back to not starting at all now like it had been doing when all the problems started. I had the crankshaft sensor replaced and that seemed to cure the crank no spark problem.
I'll try to start it agin in a bit and it will be like it is flooded - massive gas smell. Fuel pump works ok.

[AKWE-gt]

might check the catalytic converter. had the same symtoms in my formula when the cat was plugged up.

[jon95se]

let it sit. or hold the pedal to the floor and let her crank, that tells the system to purge and it will start.

[barbied]

Hopefully resolution to the problem :
Sensor wire connection wire full of oil and antifreeze
Different mechanic found that evidently when crankshaft sensor was replaced, the connection waterproof shield was stripped and filled with silcone. This caused a short - no spark condition when engine is hot - cold it seemed to be fine.
The wire was replaced with waterproof shield, sensor area cleaned out. Car tested, and so far so good. I will know in a week or so if this resolved the issue. Thanks again for all the great input. The fuel pressure regulator tested out a-ok (it was dry) by the way...

[barbied]

ok. Got her back,
but now she runs REALLY HOT (to the red zone.-but cools down when I'm driving. I'll check coolant level again in the am, but the coolant was just filled. I dont see a puddle where.

[jon95se]

classic thermostat problem. it is stuck open. time to replace that.