Question about 1995 GMC Jimmy

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94 jimmy rough idle smells like fuel? from rear. doesn't look like leaking? The egr valve has been cleaned and i have no check engine light on. the cap, rotor, plugs and wires have been change and it still has problems starting the first time in the day or if it has set for a few hours. Can anyone help?

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My 94 and 95 blazer did that the fuel crab hoses are probably cracked inside the intake it will cause gas to pool up in between the upper and lower intake

Posted on Nov 28, 2009

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Hmmm, I would have said a coolant problem, when it sits for awhile, coolant seeps onto the piston top not allowing the fuel and spark to ignite, are you losing coolant? Perhaps the problem may be with the smell, your fuel filter, try swapping that over. Shoot down to the mechanics who has a code reader, he may be able to find an error, he shouldn't charge you for looking, ask him before you go down. Good luck

Posted on Nov 20, 2009

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Is there a smell of fuel when you check the oil ? If there is some fuel may have leaked into the intake. Google fuel smell on dipdtick. Then go from there.

It can also be the IAC Valve located just inside the hole where the air clener hose is attached. it is located to the side of the wall inside. With the engine running at about 1300 rpm, spray carb cleaner directly at the holes. Shut off the engine and let the cleaner soak in. then repeat the process 3 or 4 times. Spray a good 10 seconds at a time.

Posted on Nov 20, 2009

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Go to a mechanic that has a scope that can look into the throttle body...into the intake manifold. It's a $10 dollar part that would probably cost a diagnostic fee of about $60...to tell you it's the fuel control valve; which is leaking fuel into the intake. The fuel can sit in the intake causing a hard start situation; especially after an overnight first start.

If this helps...please kindly indicate so.

Mike.

Posted on Nov 20, 2009

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Posted on Jan 02, 2017

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SOURCE: falls on it's face when

Slimsoul, a bad fuel pressure regulator would cause a problem similar to this. You may already know this but a fuel pressure regulator kinda works backwards from the way you would think. When your car is at idle it produces the most amount of vacuum which power things like brakes. As your RPM's increase your vacuum drops. When a fuel pressure regulator recieves 0 vacuum it fully opens and allows the most amount fuel to flow through. So, you mash on the gas from idle and the car stumbles from lack of fuel. A common cause of this is because the regulator diaphram has a hole in it, which causes it to open slowly. There is a very simple test for this that, yes, even you can try at home. I'm assuming your corvette is a C4 (84-96). Open the hood, stand on the passengers side, and stare towards the back of the plenum just in front of the distributor. Now look underneath the upper plenum, and attatched to the lower manifold at an approximate 45 deg angle is a round piece that kinda resembles a top hat. This is your regulator. There should be a hard black plastic vacuum line attatched to the regulator. Now for the tricky part, unplug it and crank the car. If the regulator is in fact the problem, this should at least improve if not eliminate your problem. If it does not, my next step would be to check your fuel pressure with a fuel pressure gauge available at Autozone for around $40. A TPI motor needs at least 40 psi to operate properly. Back to the regulator, if it is in fact the problem your going to have to replace the diaphram in the regulator which is somewhat of a pain. You have to pull off the throttle body and upper plenum to get to it. Additionally the FPR is secured with special security torx bits, I believe its a T5. The plenum runner gaskets and throttle body gaskets will need to be replaced if they're original. If you're not somewhat handy I would suggest taking it to a shop to do the job.

Posted on Oct 27, 2008

kirkx
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SOURCE: 1995 gmc jimmy 4x4 rough idle smell gas from tail pipe

To check EGR valve, plug the vacuum hose to it, and it should not get hot anymore. It if does, it is leaking.
But gas smell is usually bad plug wire or plug.
With good insulation, remove one sparkplug wire at a time, to see if one has no effect. That is the target.

Posted on Jul 25, 2009

emissionwiz
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SOURCE: 1995 gmc sierra 5.7 350. rough idle in gear when warmed up poor fuel miledge. changed vacum lines between throttle body and pvc,t-body and evap can. purge solenoid ,egr and map sensor.egr engine code

It sounds like you may have low compression in one or more cylinders, suggest you run a compression test, this should always be done when this condition exists and igintion is not source of problem. This engine also can have issues with intake manifold leaks, use a can of carburetor spray and spray around the intake gasket are to cylinder head, if a leak is present then the idle change when you hit the leak.

Posted on Dec 08, 2011

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