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Old 10-23-2015, 06:17 AM
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2005 wk 3.7

So Jeep gurus, I am still having issues with my jeep. I have the 3.7 and it is having the low idle blues with a vase of the shakes. Only happens at operating temp. I have replaced the TPS,IAC,cleaned the throttle body thoroughly as well as replaced the champ double platinums with autolite copper core plugs all gapped correctly and after a couple junk new PCV valves from oreileys put a good one in from Napa. I ran a bottle of fuell additive through as well . None of these items have worked. Still idles great when cold but at temp drops to 500 and has rough idle shakes. The one thing I have noticed is that if I drive to town and then shut it off and restart in a few minutes it sounds like it has a muffled back fire...or a " burp" not a good sound guy. In the engine area I can hear some what sounds like hissing but that seams to be coming from power steering resivoir ? And vac around d there ?. Anyway....what next? I took it to mechanic\shop and he said it was fine. Of course this was the same place I bought it from.

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Old 10-23-2015, 06:29 AM
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Re: 2005 wk 3.7

Since temperature is involved, it could have to do with the crank position sensor.
Also, if you have a scanner, you could check the O2 sensor operation. On a cold engine, the O2 sensors are not used for fuel trimming. When warmed up a bit, the O2 sensors are used for fuel trimming. If a sensor is getting bad, it could downtrim the fuel without need. I would at least check the 1-1 and 2-1 O2 sensor voltages, they should change rapidly from 0.2-0.8V. If one, or both is/are slow in changing the voltage or fixed at one voltage, its probably time for new sensors.
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Old 10-23-2015, 06:46 AM
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Re: 2005 wk 3.7

U kind of read my mind. Work third shift and have been here thinking and looking....on my lunch break...lol for a couple days. We bought this for my son's birthday thinking ol man emu and some tires and have yet to get past this. I'm willing to try anything. But I was thinking maybe crank sensor or the o2s....
Thanks for the help.
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