Question about 1994 Jeep Grand Cherokee

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My 94 G/C V8 will sometimes on a warm start, act like its vapor locked. I happens more often on a warm start with A/C on. It will stutter to the point of dying if in gear. Rev it up 4 or five times and it clears up. , Also, I,ve gone from 13.5 MPG to 10 MPG City in 6 Months. Other than a tune up, Whats up ? ?

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  • 26 Answers

Have you checked it for engine codes? Trouble codes should point you in the right direction.

Posted on Dec 26, 2017

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SOURCE:

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: 99 jgc v8 used to get 18 mpg now gets 4-10mpg has codes

P0202,203,206,208 are injector control circuit issues, this means it is either wiring harness related or powertrain control module related, P0133 and P0171 are O2 switching issues, this may be related to the injector circuit problem since it is a fuel control issue. This one is going to ake a trip to the dealer to sort out.

Posted on Nov 27, 2008

  • 195 Answers

SOURCE: eng. dies just like you turn off swich starts backup runs great

Check the roll over protection switch. Make certain that the connection is good and not corroded.
RPM Northwest

Posted on Jan 17, 2009

  • 5 Answers

SOURCE: no spark/wont start

i have a 98 and it has a distributor but it could be a fuel issue more than a spark if you have a fuel pressure gauge and check it.should be above 30 psi to me it sounds like a fuel pump thats bad

Posted on Jan 19, 2009

  • 1 Answer

SOURCE: 1996 Jeep Country Wagon. Replaced fuel filter and

My 99 Jeep Cherokee keeps shuting off when I am taking right turns. If anyone can point me in the right direction that would be awesome. I am really stumped.

Posted on Jun 23, 2009

  • 6982 Answers

SOURCE: 1995 jeep cherokee dies after driving for more

Most run at 200-210 degrees so the temp you stated is fairly normal....Vapor lock generally is associated with mechanical pumps that put out 5-8lbs of pressure...the electric pump in your car puts out over 40 when needed and unless you're running in the desert, it's doubtful that it's locking.You need to do some testing to determine exactly what pressures you have at the fuel rail, if you are getting good spark etc. in order to determine what's going on there. Don't work blind...get a manual like chiltons or haynes that can give you specifications and test procedures...It's cheaper in the long run than just throwing parts at it 'till the problem goes away!!! If the engine is balky or slow turning the problem may not be fuel or ignition but may turn out ot be a worn out starter...That's why testing is so important!!! If you have any questions about any specific tests, don't hesitate to ask. Good Luck!!!!

Posted on Jul 09, 2009

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Vapor locks


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You need to figure out if you are loosing fuel pressure or spark when it will not start back up. Could be a fuel pump relay or ignition module among other things. Even a problem with the vent for the gas tank.

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Is it vapor locking or not? All else shows okay.


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