2004 jeep grand cherokee 4.7 v8, antifreeze vapor from exhaust, slight miss,no overheating , starts & runs fine otherwise,164000 miles , oil was always changed every 3000 miles , I'm guessing

SOURCE: 2000 jeep grand V8 low idle then dies

check to see if you got a pluged cat

Posted on Oct 25, 2008

SOURCE: 93 Jeep Grand Cherokee Won't start

The crankshaft position sensor was seriously problematic in those old jeeps. It's located towards the top of the bell housing slightly to the driver's side I think.

Posted on Apr 15, 2009

SOURCE: Slight miss, starts a little hard then runs fine rough idle from time to time

It sounds like its out of time move the distriutor a little bit

Posted on May 15, 2009

SOURCE: JEEP DEALERSHIP PERFORMED HEAD GASKET REPAIRS ON

Check your water pump for signs of seepage. Do this with no pressure in the system and cap off. Sometimes in the beginning stages of failure pressurizing the system will drive the seal against the shaft and actually hide the leak. I have seen very small cracks in cylinder heads, especially between the valves that won't show up on a pressure test 'till they get worse. Check the plugs for any coloring from antifreeze.
You are going in the right direction so far, but need to go over everything sometimes a few times before a small leak is found. Keep an eye out for dried or semi-dried stains, especially around the perimeter of the head /block parting line...sometimes small leaks will only leave a slight stain, often white or antifreeze colored powder residue.
Hate to say it, but sometimes when you can't find it, just put some block sealer in there and see if it corrects the problem.I'm a professional but sometimes just doing that saves a big headache for a small problem.

Posted on Nov 19, 2009

SOURCE: Idle problems 1995 Jeep Grand Cherokee Limited V8

There are several possibilites.
When it dies does the Engine Light come-on and stay-on? If so there are codes which are present that can isolate/point you to a more specific problem.
Based soley on your description: I would first check your Spark Plugs, Wires, and Coil. When were they last replaced? If these are fine: When was the Fuel Filter replaced? Air Filter? Check the fuel pressure at the port located on the fuel rail in the engine compartment.
If those check out okay: I would check and/or replace the Idle Sensor and/or the Throttle Position Sensor.
Basic rules on bad idling:
1. Fuel - is there enough getting to the cylinders?
2. Spark - Is there consistent spark getting to all the cyclinders?
3. Air - Is there a air shortage = clogged air filter?
Let me know if this helped, or if you have additinal information or questions. Feel free to contact me a FixYa.com!

Posted on Jan 06, 2010