05 3.4L Sputter problem

[SuperDutyKid]

Here's the issues.......

My 2005 Base 3.4 has had that same isssue for about 6 months now.

In the morning when I go to leave for work, no matter how long I let it warm up, it will sputter REALLY bad under light acceleration for the first couple minutes, then it'll be fine all day, until the next morning.

Parts changed: Fuel regulator, MAF sensor, MAP sensor, Catalytic convertors, injectors cleaned by dealers twice.


It has been to 3 different dealer, on about 8 different occasions. Any help??

[crazy Jim]

intermittant probs are a real beotch to track down. Since its been to the dealer on several occasions I'll have to assume that they had it on the diagnostic machine first thing before it got warmed up to check the various engine management sensor readings. The 3.4 as well as the 3.8 have intake issues where they begin to leak coolant, sometimes its visible outside the engine, but other times it can leak into a cylinder. My 3.4 would leak after I turned the engine off, but it was exterior. If you have an interior leak that allows the coolant to enter the cylinder only after you shut the engine down for the night this could explain why you are having issues only first thing each morning. You could have one cylinder partially filling with water over night and when you go to start it in the morning it could be mis-firing or, worst case, attempting to hydraulic lock on the affected cylinder. There is a new and improved gasket to eliminate this problem.

[etuke]

if you are getting coolant leaking into the cylinder then you should notice excess steam out the tail pipe.You should also get the coils and wires checked.

[SuperDutyKid]

Thanks for the replies!!

It seems that since I've been dealing with Chevy customer service for the past month, they've now come to the resolution of buying the car back since they can't fix it. The lady called me yesterday and said that's what was gonna happen. Said she would call me in a few days with the "Offer". We'll see what they try to give.