WJ - GC 4.7L Ltd - Will only start when cold - Hot engine will take ages to start. - JeepForum.com

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post #1 of 2 Old 04-22-2010, 07:54 AM Thread Starter
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2001 WJ 
Join Date: Feb 2010
Location: UK
Posts: 17
WJ - GC 4.7L Ltd - Will only start when cold - Hot engine will take ages to start.

Hey guys.

I recently had issues over in this thread.. http://www.jeepforum.com/forum/f13/n...roblem-977062/ .

Initially it was bad at starting and running badly but I have changed quite a few things now and seem to have rectified something..

I have changed in the last 4 weeks...

Battery (optima Red Top, as above post).
Crank Position Sensor.
Coil Pack on the front of engine (front of car) 2 cylinders. (changed on April 20th 2010)
New Spark Plugs.

Now the Jeep runs fantastically on cold startup and when it is running under any hot/cold start conditions. The issue is that it is really hard to start once the engine is running hot.

First thing in the morning since I have changed the 2 coil packs it is about a 2 second start routine and just purr's with no help from feathering the throttle. Perfection.

Where do you think I should be looking to make some progress folks?


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post #2 of 2 Old 07-08-2010, 11:15 AM
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2002 WJ 
Join Date: Dec 2007
Location: Utah
Posts: 3,222
Sounds like a fuel pump. WJs were very bad and losing fuel pressure due to the orings in the pump. You can confirm this by priming the system by turning the key to run a few times, then cranking. If it fires right up then you found the problem. Mine had the same issue.
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