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  #11  
Old 03-28-2015, 02:48 AM
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I forgot to ask about the air filter, but assume it's good.

I want to say EGR valve hung open, but that isn't relevant if we're comparing it to a cub. Neither would the cat.

Fuel pressure, volume, and quality good?
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  #12  
Old 03-28-2015, 02:52 AM
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Valves ok?
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  #13  
Old 03-28-2015, 03:04 AM
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Are injectors firing ok and not allowing more then they should through?....now you got me wanting to go work on a car :/
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  #14  
Old 03-28-2015, 08:23 AM
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In my very non-professional opinion it is a timing issue. If the intake valve closes early, it will not get enough air but the same amount of fuel resulting in rich mixture and the other symptoms.

Glad I could be of help
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  #15  
Old 03-28-2015, 08:37 AM
seawood seawood is offline
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DOHC new timing cover gasket was the exhast can out of time replaced head on a 1995 several tries to get timing right. Looked good till rotated over then exhaust cam off
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  #16  
Old 03-28-2015, 09:23 AM
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its a 2.4 gm nuff said... where is the fuel pressure regulator? on the rail that burnt? but wait you said injectors are not over fueling... my gut keeps thinking cam timing is off
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  #17  
Old 03-28-2015, 09:23 AM
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DOHC ----
thinking #225 comp WTF? cam or cams timed wrong to each other and or to crank---- low vacuum/rich mix
I'd be looking @ alignment marks on sprockets.
And when we figger out what is wrong, we want paid Ha,LOL!
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  #18  
Old 03-28-2015, 09:44 AM
tech1979 tech1979 is offline
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J - mech the car I had was running exactly how you describe. Fuel trims we're rich, random misfires, but 1 cylinder missed more, IAC and map readings were the same. I couldn't hear a vacuum leak. To be honest when I pulled the car in my immediate thought was the timing was off, exhaust had that wonderful sound. If your car is misfiring on one cylinder more than the other put a fuel source underneath that cylinders intake runner, I would bet money the engine speed picks up. We use a propane torch with hose.
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Old 03-28-2015, 09:55 AM
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Had plenty of time and cars with this engine (unfortunately). My instincts tell me timing, although the compression numbers make me wonder
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Old 03-28-2015, 10:19 AM
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Unmetered air comming in after the MAF, like a split in the air induction tube?
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