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-   -   4.0 ZJ intermittent stumble in idle (http://www.jeepforum.com/forum/f13/4-0-zj-intermittent-stumble-idle-1566349/)

JaneLee 08-23-2013 11:12 PM

4.0 ZJ intermittent stumble in idle
 
funky issue and no solutions in sight. i have a 94 4.0 I6. it has an intermittent slight stumble in P or N but RPM is normal. As soon as you put it in any gear the RPM drops to about 5-600, stumbles and acts like it wants to die. Cleaned the throttle body and butterfly, replaced the TPS, MAP sensor and IAC. No vacuum leaks, all injectors working with no leaks there, fuel pressure is normal at 33psi. No change in running with or without O2 screwed in so i don't think it's the CAT and CAT has no rattle at all. It wont make to a shop so i can get it scanned. Any suggestions?

newfieZJ 08-24-2013 06:17 AM

Start by cleaning your grounds .

Re-seat all your fuses and relays everywhere , and your PCM connection . Clean as needed .

Clean battery terminals

Consider pulling the crank sensor and cleaning it . It's a magnetic pick up and it picks up small metallic debris . Could be a weak signal .

If your check engine light(CEL) is on , use the key method to retrieve codes . Key to on(not start) off , on , off , on . Then the codes will blink via the CEL by blinking . Blink blink blink space blink blink = code 32

Try this first , it's free ;) . If no luck , post results .

JaneLee 08-24-2013 09:28 AM

throws no codes, just start and stop 12-55. battery term clean. pcm?

Oldfrog 08-24-2013 01:20 PM

Merely unscrewing the o2 sensor will not give you the desired results for a test. Disconnect it from the connector.

ZeeJay1997 08-24-2013 02:07 PM

Quote:

Originally Posted by Oldfrog (Post 15831720)
Merely unscrewing the o2 sensor will not give you the desired results for a test. Disconnect it from the connector.

good catch oldfrog. aren't we fixing the same jeep in another thread?

JaneLee 08-24-2013 02:22 PM

probably lol had internet/puter issues. mine went down and had to borrow being i'm stranded in another state

ZeeJay1997 08-24-2013 02:25 PM

disconnect o2 sensor. the connector should be under the manifolds


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