Need some help!!! - JeepForum.com

 
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post #1 of 14 Old 04-06-2014, 01:59 PM Thread Starter
ShadowBroker
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2004 KJ Liberty 
 
Join Date: Apr 2011
Location: Champaign
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Need some help!!!

I have a 2004 Jeep Liberty with the 3.7l V6. Lately (at random times) the engine will bog down and act like it's being starved of either fuel or air. Even when the accelerator is pressed all the way to floor the engine doesn't respond. After a time the engine will rev up and it will drive just fine until the next time. On the occassion that it stalls, it will always restart and run fine until the next episode. I have replaced both Cats and front and rear O2 sensors. At this point I need some guidance before I throw more money at it.

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post #2 of 14 Old 04-06-2014, 03:21 PM
95BadBoy
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Have you hooked up a scan tool to see if you have any codes showing?

05 TJ RME 42RLE with some things
05 KJ CRD 545RFE, GDE Eco tune, Franky II, Al's 4.5 A-arms, JK Rubi Moabs, Silent Armors 245-70-17's, Spidertrax Adapters, Rola Basket, Fumoto Valve, Pinch welds pounded - Sold 2015
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post #3 of 14 Old 04-06-2014, 07:57 PM Thread Starter
ShadowBroker
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As of right now, I have no codes at all. Even when it did have codes it was for the O2 sensors, which have been replaced.
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post #4 of 14 Old 04-07-2014, 02:09 AM
xxxxxxxxxxxxSmetna
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Quote:
Originally Posted by ShadowBroker
I have a 2004 Jeep Liberty with the 3.7l V6. Lately (at random times) the engine will bog down and act like it's being starved of either fuel or air.
MAF sensor ok? PCV ok? Maybe your fuel injectors are filthy? Try running a couple bottles of Techron through your gas a couple tanks before your next oil change.
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post #5 of 14 Old 04-07-2014, 01:12 PM Thread Starter
ShadowBroker
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Thanks for that info. I'll do that. Someone else suggested that the dreaded fuel filter may be clogged. Would that give me such issues?
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post #6 of 14 Old 04-07-2014, 01:54 PM
xxxxxxxxxxxxSmetna
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If the problem is intermittent, probably not. Maybe one of the resident experts will stop in and give $.02
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post #7 of 14 Old 04-07-2014, 02:20 PM Thread Starter
ShadowBroker
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I appreciate all help I can get
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post #8 of 14 Old 04-08-2014, 07:56 AM
Bilge
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2008 JK Wrangler 
 
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First I'd do what Smetna suggested and then I'd also suggest checking the idle air control valve (IAC). Does it happen while cruising at a steady rpm or while accelerating from a stop or both?

Currently Own: '99 WJ - '02 KJ - '05 WK - '08 JK
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post #9 of 14 Old 04-09-2014, 09:09 AM Thread Starter
ShadowBroker
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It happens both times!
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post #10 of 14 Old 04-10-2014, 11:06 AM
Bilge
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Okay, then probably not the IAC.

Is your check engine light (CEL) on? If so, see if any of the local auto parts stores will do a free CEL check. Even if there are no lights, you still may want to check to see if there are any stored codes. My wife's '05 WK had no CEL but I found 10 stored codes two with freeze frame data. She said the CEL was on briefly a couple of months ago but went off.

It would really be nice if you could get your hands on a data logger. Since the computer makes decisions based on data from the sensors it's often difficult to tell when a sensor is giving bad data until it completely fails and triggers a code. For example, my son's Eagle Talon was experiencing erratic driveability problems; After logging the data it was clear that the throttle position sensor (TPS) was going bad. There were no codes because the sensor hadn't completely failed or given data outside set parameters, but it wasn't giving proper data either.

Currently Own: '99 WJ - '02 KJ - '05 WK - '08 JK
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post #11 of 14 Old 04-30-2014, 07:38 AM Thread Starter
ShadowBroker
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I finally got around to fooling with my Liberty again. I started it up and drove it and it is having the same issues, but this morning it started something new. The idle was very high (but not more stalling). I used my cheapo OBDII scanner and got a code P0507 (Control System RPM Higher Than Expected). I unplugged the IAC and the idle returned to normal and stayed there when I plugged the IAC back in. Is this an indication of a faulty IAC?
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post #12 of 14 Old 05-01-2014, 07:33 PM
Bilge
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2008 JK Wrangler 
 
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It very well could be. But it sounds like it could also be the IAC control circuit. The reason I am thinking this is because unplugging the connector (if I read that correctly) lowers the idle. The valve could still be bad, malfunctioning electrically, but usually they just get worn and dirty then tend to stick. I believe I have a Factory Service Manual in pdf on my laptop. I'll see if I can track that down and find out the circuit diagnosis procedure then post it here for you.

Currently Own: '99 WJ - '02 KJ - '05 WK - '08 JK
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post #13 of 14 Old 05-04-2014, 07:27 AM Thread Starter
ShadowBroker
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Thanks. When I say the idle dropped, I mean that when I started the truck the idle was running at about 1300 rpm. Once I unplugged the IAC, the idle returned to normal.
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post #14 of 14 Old 06-11-2014, 06:15 AM Thread Starter
ShadowBroker
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2004 KJ Liberty 
 
Join Date: Apr 2011
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Finally got the problem solved. I took the Liberty in to have the AC charged. The mechanic could not the the compressor to run. While doing some trouble shooting, he found a very loose ground strap. He fixed it (and found another). The compressor started running and I have had no problem with the engine bogging down. I have driven the truck for a week with with no stalling or stuttering from the engine. I'm so happy to have this problem solved and have my AC working again.
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