96 Cherokee stalls when warm - JeepForum.com

 
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post #1 of 4 Old 05-10-2012, 04:42 AM Thread Starter
DrMulholland
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1996 XJ Cherokee 
 
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96 Cherokee stalls when warm

Hi, looking for ideas....Summer is upon us and it's getting hotter and hotter out...My 96 Cherokee starts up okay but after about 30-60 mins of driving (temp gauge halfway) it'll get harder and harder to crank and eventually it'll stall while idling (kind of annoying when I'm at a stop sign/light) and will refuse to start up again for about an hour until the temp gauge is at 1/8. And even then I have to give it some gas and it'll very reluctantly roll over.

With the key on everything works, A/C, radio, lights, etc. it just won't crank. A little background, just recently I had the radiator, cat, and both O2 sensors replaced.

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post #2 of 4 Old 05-10-2012, 06:02 AM
chiefbill1959
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So it won't even crank after it gets warm, hmmm. It could be 2 seperate problems with one being heat soak which would cause a stall and then perhaps an open circut in your starter which shows its ugly head when everything is hot. Interesting problem.

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post #3 of 4 Old 05-10-2012, 06:35 AM
tjwalker
It's the crank sensor!
 
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We may possibly have a misunderstanding of terminology.

Explain what you mean by "but after about 30-60 mins of driving (temp gauge halfway) it'll get harder and harder to crank"

Do you mean that it turns over fine but won't START, or do you mean that it doesn't turn over well.

My interpretation is that the starting circuit always turns the engine over well, (IE: cranks) but the problem is actually the engine STARTING.

The fact that it doesn't start again until it cools down means you are experiencing "thermal failure" (heat related) of a component. A primary suspect there is the crankshaft position sensor. Secondary suspects are the ignition coil and camshaft position sensor.

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post #4 of 4 Old 05-10-2012, 09:08 AM
CJ7-Tim
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Stalling, needing use the gas pedal to start, and/or not cranking points to a low voltage issue or high resistance/loose wire connections aggravated by heat.



Possible causes:
  • low battery voltage from a short circuit
  • excessive voltage draw with the ignition off
  • a failing battery
  • a failing alternator
  • dirty or loose wire connections
  • internally corroded wires
Perform routine maintenance of the start and charge systems. Remove, clean, and firmly reconnect all the wires and cables to the battery, starter, and alternator. Look for corroded or damaged cables or connectors and replace as needed. Do the same for the grounding wires from the starter to engine block, and from the battery and engine to the Jeep's frame/body. You must remove, scrape, and clean until shiny, the cable/wire ends, and whatever they bolt to. Jeeps do not tolerate low voltage, bad connections, or poor grounds.


Have the battery and the alternator Load Tested for proper function in a test machine that applies a simulated work load. Handheld testers are inaccurate and will often pass faulty parts.

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