Dadic 78

1994 Firebird LT1. Had the engine running in the garage, started lifting the car with my jack (passnger's side first) about 15". The engine stalled out when I had the right side in the air, and I didn't think much about it, figured it was starved of fuel or something... Proceeded to lift the other side, and left it alone for a couple weeks... Today I go to start it (no tires on, still in the air) and it'll turn over all day but it won't fire... Any ideas why???

I should mention that after it stalled out I didn't touch it for about a week. Today I completed an oil change on it, but nothing went sideways, no wet opti, etc... So I'm pretty sure lifting it one side at a time affected something.

1fastrock

iTrader: (1)

Check for crushed fuel lines?

SS RRR

iTrader: (2)

First thing I thought of...

93M6Formula

You either crushed some fuel lines or you were low on oil and the low oil sensor got triggered and shut the car off (I believe that's how it works?) Are you that low on gas?

Shownomercy

iTrader: (1)

Low oil sensor is an idiot light only. PCM does not care how much or how little oil you have.

Dadic 78

There's almost a full tank of fuel. I'll double check the fuel lines.

93M6Formula

I was just curious because it also does not let you start your car when it doesn't sense oil. I was distracted one day when I changed my oil and forgot to put oil in and it wouldn't turn over, filled with oil after I realized I about fucked over my engine and it fired up then.

guppymech

iTrader: (7)

Is the fuel pump running? I had a '88 mustang that had a 'roll over' switch that would turn off the fuel pump.

SS RRR

iTrader: (2)

Makes no sense after all the "my car is running with no oil pressure" threads that have popped up over the years. I do not believe the oil sensor is connected to the PCM in any way.

93M6Formula

Then my car is a freak because it wouldn't send power to the starter until I added oil.....

ditchdrift

iTrader: (1)

then it would never crank to build up the oil pressure

mab6680

iTrader: (1)

when my oil pump drive gear broke my car didn't shut down or prevent me from staring it

WCT13

iTrader: (1)

Mine didn't shut down, but when we towed it home, it wouldn't start back up.

Dadic 78

When I turn the key to "on" I'm pretty sure I can hear the fuel pump fire up. I still haven't had a chance to get back to check it out for crushed fuel lines, etc...

I thought as well that it may be a rollover type switch. How did you get your mustang pumping fuel again?

guppymech

iTrader: (7)

I never actually had the switch trip, IIRC there was a push button to reset it.

BALLSS

OP

confirm you have fuel "pressure"

Shownomercy

iTrader: (1)

Have you checked the yaw sensors?

The angle could be extreme enough to make them fuzzy and cut out spark to the opti which means your starter wouldn't engage.

Dadic 78

What's the best way for me to do that? (Sorry, haven't done ANY fuel line work in my past!)

Well the starter does engage, it will turn over no problem. Just never fires up, that's all.

BALLSS

with a fuel pressure gauge like this:

http://www.jegs.com/i/Hypertech/533/...FY6RfgodzbcAug

the hose screws onto the Schrader valve on your fuel line rear of motor. It will have a cap on it that looks like a large tire valve cap.

some auto part stores may have them as a "loan-s-tool" deal. A good tool to have in your toolbox.

Dadic 78

Well I've just spent the afternoon in the garage. Inspected for crushed fuel lines, and found none. All seem to be in good shape. Interestingly, the fuel lines run along the left side of the car, and the engine stalled out when I lifted the right. I still haven't had a chance to get a fuel pressure guage, that's probably going to be my next step.

Can anyone confirm if there's any sort of rollover sensor in this vehicle? Or something of the sort that may be causing a no spark condition? And if there is one, how to reset it?