Possible no combustion in cylinder 1
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From: North canaan Connecticut
Year: 01, 99, 98, 98,98
Model: Cherokee
Engine: 4.0
Last edited by Waynerd; Feb 17, 2018 at 07:22 PM. Reason: Didn't link like I meant to
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Year: 1998
Model: Cherokee(SJ)
Engine: 4.0L
Another Quick update. I have not run it much since my last update. I was able to get it out today and after a lot of running it’s getting better. I have a long stretch to run tomorrow so I’ll update more after.
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
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Newbie
Joined: Feb 2018
Posts: 12
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Year: 1998
Model: Cherokee(SJ)
Engine: 4.0L
Okay so i've finally had time to drive it around a bunch. I've done multiple trips 65 miles plus, and have been driving it daily to work. The rough idle has improved, but i'm getting an intermittent misfire in cylinder 1 CEL code. It'll start idling really rough randomly, the CEL will come on after another 20 miles or so. Then once it's idling back to my "normal" the CEL will go away. The idle is still not perfect when it is running right, but i'll take that over the intermittent misfire. I think overall the water has been a positive improvement, but need to solve this other issue ASAP, i have a big run next weekend out in the desert. Thanks again for all your help.
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Newbie
Joined: Feb 2018
Posts: 12
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Year: 1998
Model: Cherokee(SJ)
Engine: 4.0L
It's always had a semi rough idle since i bought it a year ago. It improved a bit with new injectors, but the intermittent misfire in cylinder one has developed since the injectors were replaced. The first cylinder inject was replaced a second time just to be sure it wasn't a faulty inject i put in.
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Joined: Dec 2017
Posts: 622
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From: Calgary, AB
Year: 1998
Model: Grand Cherokee (ZJ)
Engine: 5.2
It's always had a semi rough idle since i bought it a year ago. It improved a bit with new injectors, but the intermittent misfire in cylinder one has developed since the injectors were replaced. The first cylinder inject was replaced a second time just to be sure it wasn't a faulty inject i put in.
Tried a different ecu?
When its running if you pull a plug wire any change in how it runs?
Last edited by firebane; Feb 23, 2018 at 02:33 PM.
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Newbie
Joined: Feb 2018
Posts: 12
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Year: 1998
Model: Cherokee(SJ)
Engine: 4.0L
I have not tried a new ecm. When it’s misfiring bad I can pull the first plug and nothing happens. When it’s idking decent it does make a difference when I pull a plug.
Senior Member
Joined: Dec 2017
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From: Calgary, AB
Year: 1998
Model: Grand Cherokee (ZJ)
Engine: 5.2
Also just a shot in the dark are your plugs gapped properly?
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Joined: Aug 2011
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Thread Starter
Newbie
Joined: Feb 2018
Posts: 12
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Year: 1998
Model: Cherokee(SJ)
Engine: 4.0L
Firebane - i checked all the plugs and they are gapped properly
Cruiser54 - I don't typically rev the engine high, i've never gotten to the red. I've gotten it up to 4000 rpms maybe 4500
Quick update, i took it to a mechanic and he seems to think the injector plug was a little loose, and has the jeep running right. He also said he thinks the ECM might be going on it because the injector plug negative voltage was low. It was 2.5 when the average is 5? Anyone have any experience with this? He didn't charge me for the diagnostic so it makes me think he's honest, but any input would help.
Once again i appreciate all your help!!!!!
Cruiser54 - I don't typically rev the engine high, i've never gotten to the red. I've gotten it up to 4000 rpms maybe 4500
Quick update, i took it to a mechanic and he seems to think the injector plug was a little loose, and has the jeep running right. He also said he thinks the ECM might be going on it because the injector plug negative voltage was low. It was 2.5 when the average is 5? Anyone have any experience with this? He didn't charge me for the diagnostic so it makes me think he's honest, but any input would help.
Once again i appreciate all your help!!!!!
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Firebane - i checked all the plugs and they are gapped properly
Cruiser54 - I don't typically rev the engine high, i've never gotten to the red. I've gotten it up to 4000 rpms maybe 4500
Quick update, i took it to a mechanic and he seems to think the injector plug was a little loose, and has the jeep running right. He also said he thinks the ECM might be going on it because the injector plug negative voltage was low. It was 2.5 when the average is 5? Anyone have any experience with this? He didn't charge me for the diagnostic so it makes me think he's honest, but any input would help.
Once again i appreciate all your help!!!!!
Cruiser54 - I don't typically rev the engine high, i've never gotten to the red. I've gotten it up to 4000 rpms maybe 4500
Quick update, i took it to a mechanic and he seems to think the injector plug was a little loose, and has the jeep running right. He also said he thinks the ECM might be going on it because the injector plug negative voltage was low. It was 2.5 when the average is 5? Anyone have any experience with this? He didn't charge me for the diagnostic so it makes me think he's honest, but any input would help.
Once again i appreciate all your help!!!!!
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