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Old 10-19-2013, 03:51 PM   #1
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Starting Hard/ Sputtering When damp outside?

I appologize if this has already been answered elsewhere, but i recently bought a 99 TJ 2.5 4 cyl. and it has some difficulties when its cold/damp outside. I already replaced all the plugs, plug wires, distributor cap and rotor, thinking that was the issue, but not much improvement. It starts and runs great on warm dry days. On damp days when it does start, it sputters pretty badly, specifically around 2,000 rpm, until the engine warms up then it runs just fine.

Not sure what else to do. Ruled out the IAC, and obviously my home tuneup did no good, any suggestions??

-Grizzly

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Old 10-19-2013, 06:30 PM   #2
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You might try starting it and when this happens, shut it off immediately and run a code check. If it happens again, turn it off again, and run the code check again. It's an inexpensive way of performing the diagnostic. It doesn't hurt to check your air filter case for water. If your air filter is soaked, I would replace it. Check your oil for water too. Maybe you have a engine coolant leak, or condensation is building up in your engine. You might want to change your oil, and when you dump it, check it for water.

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Old 10-19-2013, 08:42 PM   #3
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I had the same thing happen on my 99 and I've replaced the throttle position sensor 3 times until I found one that worked properly...
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Old 10-20-2013, 09:20 AM   #4
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Thanks for the advice guys, i'll have to check that out. Did give a fresh oil change and all was well there. However the coolant overflow is bone dry... Hopefully its not a leak, but i guess i'll fill her back up and see if im losing any.

-Grizz
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Old 10-20-2013, 10:37 AM   #5
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Quote:
Originally Posted by Grizzly1200 View Post
Thanks for the advice guys, i'll have to check that out. Did give a fresh oil change and all was well there. However the coolant overflow is bone dry... Hopefully its not a leak, but i guess i'll fill her back up and see if im losing any.

-Grizz
You will lose some due to evaporation of the water. Maybe your Jeep is just getting a little old and feeling the effects of arthritis on damp days.
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