Slight miss

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Fitts07

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I had to do the timing set because of bad tensioners. Had really bad chain rattle on startup.

The miss developed in the middle of a 2k mile road trip. Prior to leaving i had changed the plugs (bought from the dealer), air filter and changed the oil. I changed all coils halfway home thinking one or more coils might be getting weak. Its never gotten any better and i feel like its very slowly getting worse. MAF and throttle body are clean, also just normal paper air filter not an oiled one.
 

Trainmaster

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If this was my problem, I would replace the plugs again. They are cheap and the problem surfaced after you changed them. Sounds like that's all you did before the miss began. I'm assuming you replaced the rubber boots too when you did the plugs? Just my two cents.
 
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Fitts07

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So i finally found a gauge that doesnt leak.

I have 50psi with the key on engine off, it builds instantly when the key is rolled.

55psi running, only varies by 1 or 2 psi either way. Same pressure when the miss is present or wot.

Drops to 30psi after sitting for an hour.

I've replaced the plugs 3 times since this issue started, all with dealership purchased ones.
 

mr_dave

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Injectors would be my next guess. Both the injectors themselves and electrical connections. For example, I had a previous vehicle where one of the injector wires was rubbing on a metal bracket and eventually wore through the insulation, causing a (very difficult to find) short and intermittent misfire.

If you can narrow down the cylinder that would help a lot. Then you can move around things like injectors and coils to narrow down the issue.
 
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Fitts07

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I ordered new bosch injectors. I was leaning towards them too.

The trouble is what feels like a stumble or miss doesnt center on a particular cylinder. I get a few on almost every cylinder while driving. It feels like the computer is missing a lot of them.
 
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Fitts07

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Well i got rear-ended on the way home from work on friday. Being a 2011 i think she might be totaled. Guess ill be returning my injectors lol.
 

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Motorcity muscle

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Sorry to hear about accident. Problems like this need a good code reader, not the standard auto parts tool. Can use to diagnose problem and not change good parts for cheap parts that cause more issue's.
 

Hamfisted

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Well i got rear-ended on the way home from work on friday. Being a 2011 i think she might be totaled. Guess ill be returning my injectors lol.

That's why I leave the trailering ball in the hitch. It's saved my Expy a few times. But yours looks repairable if you want to. Just find one that was totaled from front end damage but still has the good liftgate and rear bumper. Not too bad a repair. You can probably even find one that color matches.




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Fitts07

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That's why I leave the trailering ball in the hitch. It's saved my Expy a few times. But yours looks repairable if you want to. Just find one that was totaled from front end damage but still has the good liftgate and rear bumper. Not too bad a repair. You can probably even find one that color matches

I honestly just pulled my triple ball hitch with a hook on it off like the day before lol.

Yea i might do that, its been a good truck and has low miles.
 
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