Starting Problem when Engine HOT -
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Unread 03-05-2013, 07:55 PM   #1
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1998 TJ Wrangler 
Join Date: Jun 2012
Location: Pasadena, CA
Posts: 218
Starting Problem when Engine HOT

Been on a constant search to find the problem. I'm 99% sure its one of the sensors, gone bad.

The jeep starts up fine when the engine is cold, but when it's at normal operating temp, it wants to sputter and die, unless I give it some gas for about 5 seconds. Then it idles normally, (which is slightly rough for my jeep.)

Again, IT ONLY DOES IT WHEN THE ENGINE IS HOT. It must be a bad sensor that measures temperature, or else it would always do it, right? Any ideas?

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Unread 03-05-2013, 08:09 PM   #2
Motorcharge's Avatar
1991 MJ Comanche 
Join Date: Oct 2008
Location: , Virginia
Posts: 13,313
CPS probably.

  1. Near the rear of intake manifold, disconnect (CPS) pigtail harness connector from main wiring harness.
  2. Place an ohmmeter across terminals A and B. The meter reading should be open (no resistance). Replace sensor if any resistance is indicated.
For the terminals, the flat side of where they're at is the bottom. Top terminal is A, left bottom one is B.

You can also take a can of canned air and turn it upside and blow it across the terminals to cool it down (be careful not to spray your hands). Plug it back in after and if it starts up you need to replace the sensor.
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Originally Posted by Ron Swanson
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cranking , hot engine , sensor , start problems , starting problems

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