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  #1  
Old 03-17-2016, 08:56 PM
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Misfire Cylinder #1

Hello, I have a 2002 grand Cherokee Laredo 4.7 engine. Just replaced the passenger side head and had the driver side rebuilt replaced timing chain and all gears and tensioners now i'm getting a #1 cylinder misfire I have already changed the coil pack switched injector #1 with injector #3 and the code still comes back any suggestions would be greatly appreciated i'm at my witts with this thing.

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  #2  
Old 03-18-2016, 12:01 AM
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Re: Misfire Cylinder #1

Did you check the compression of cylinder #1?
Is there spark at the plug #1?
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Old 03-18-2016, 07:39 AM
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Re: Misfire Cylinder #1

I have not checked the compression yet. My concern is that it was only missing on cylinder #2 before the repair was done. The rocker had fallen off and the valve seat had dropped on cylinder#2 I just figured I would go ahead and have the drivers side head redone while I was there.
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Old 03-18-2016, 08:14 AM
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Re: Misfire Cylinder #1

Did you check that there is spark at cylinder #1? Its easy to damage a wire during the head remove/install process.
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Old 03-18-2016, 09:59 AM
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Re: Misfire Cylinder #1

I checked it with the coil pack with a spark plug in the coil and the plug was sparking.
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Old 03-18-2016, 10:09 AM
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Re: Misfire Cylinder #1

Could it be that I have the cam on that head out of time?
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Old 03-18-2016, 11:35 AM
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Re: Misfire Cylinder #1

In that case wouldn´t cylinders 1, 3, 5 and 7 not all misfire?
Is the spark plug from cylinder #1 wet after running a bit? Just to be sure its getting fuel. If so, i would check the compression first.
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Old 03-18-2016, 12:22 PM
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Re: Misfire Cylinder #1

Yes it was wet but not soaked.
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Old 03-18-2016, 04:17 PM
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Re: Misfire Cylinder #1

So it seems that spark and fuel are there. Or the timing is bad, or there is a problem with the compression. With a bad timing, I would expect to see the same for the other cylinders on that bank.
How is the engine running?
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Old 03-18-2016, 04:47 PM
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Re: Misfire Cylinder #1

It runs fine while driving down the road you can only tell it's missing when at an idle. I'm just confused as to why the problem only developed after having the head redone. but I will definitely check the compression on that cylinder.
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Old 03-19-2016, 03:31 PM
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Re: Misfire Cylinder #1

I checked the compression on cylinder#1 it's 175lb. Any other things I can check or do. The jeep has 165336 miles on. Like I said earlier I never had a #1 cylinder misfire till after I had the cylinder head rebuilt and I replaced the passenger side cylinder head. Only had a #2 cylinder misfire before the tear down. I replaced all timing chains and guides and tensioners also new plugs to.
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Old 03-19-2016, 10:59 PM
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Re: Misfire Cylinder #1

Can it be that there is a vacuum leak at the #1 intake manifold? A vacuum leak there could cause a too lean mixture which causes misfires at idle (high vacuum, so big leak), while at higher rpm the lower vacuum has less influence and the engine runs ok.
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