I have a (cough)94 GMC Jimmy! - Engine Troubleshooting


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I have a (cough)94 GMC Jimmy!

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alboho
New User

Mar 13, 2009, 6:38 PM

Post #1 of 3 (3309 views)

I have a (cough)94 GMC Jimmy!	Sign In

Hi everyone,

I'm a new poster.

I have a 1994 GMC Jimmy 4.3 CPI and it wont start.

Now I've checked pretty much all of the forums out there and don't know what to do.

I have replaced everything but the kitchen sink. Injector spider, fuel pump (60 lbs.), fuel filter, coil, igniter in distributor, computer and anything else I could think of. Checked the fuel volume (pint@15 sec.), compression on all cyl. low on 1 cyl. TPS ( voltage is good throughout throttle travel 2.2v-4.8v 5v reference).

It will start for a second, then it dies.

I heard that the oil pressure switch can shut off the fuel pump if it senses low oil pressure. True? If op sw faulty?

It ran fine last week.

Thanks for your help

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 14, 2009, 2:39 AM

Post #2 of 3 (3306 views)

Re: I have a (cough)94 GMC Jimmy!	Sign In

Yes - I think the oil pressure sender switch can disable fuel pump. It likely gives you a short grace period for start up - also check the connector.....

alboho
New User

Mar 14, 2009, 9:08 AM

Post #3 of 3 (3303 views)

Re: I have a (cough)94 GMC Jimmy!	Sign In

Thanks, I'm will be checking that today.

I will let you know what happens.

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