Question about 2003 Buick Rendezvous

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3.4 GM v6. dead skip on #4 cyl. Spark plug ok, wire ok, replaced injector. Still dead skip. Found cyl. by disconecting wires to injectors. #4 not affected.

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The very first thing that you should do after finding a cylinder mis-fire that can not be easily explained such as a fouled spark plug, is to take a compression test especially of the mis-firing cylinder to be certain that the mis-fire is not caused by a mechanical problem, and I have seen people spend a lot of time and money trying to hunt down an electrical problem when the actual problem was a mechanical one, and no electronic part will repair a burnt or bent intake or exhaust valve.

Posted on Jun 06, 2010

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Would check the plenum to make sure it did not get cracked when the injector was changed due to over torquing the plenum bolts.Is cylinder # 4 receiving spark from the coils if not suspect a coil or ignition moduIe? If those three things check out ok a compression test may be needed the determine if the cylinder compression may be too low on that cylinder due to valve issues cracked blocked or bad piston rings. Average compression is about 150 psi

Posted on Jun 06, 2010

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Did you unplug the spark plug wire or the injector plug? You have to remove the upper intake manifold to even access the injector plugs. If it was the spark plug wire that was disconnected without any effect its probably the ignition coil for that cylinder. If indeed it was the injector plug that was disconnected, I would guess the injector connecter or wiring harness problem. Sense you replaced the injector. You are talking about a 3400 in a Buick Rendzvous correct? Or a 3.4 overhead cam V6 engine in something other than a Rendezvous?

Posted on Jun 06, 2010

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Ok, this is not a throttle body injection system. It has a throttle body with a block of individual port injectors mounted inside. the intake plenum.
Since you have good compression on that cylinder, and you have replaced the cap, rotor, plugs and wires, it is fairly safe to assume you have spark because the ignition module services all the plugs. If one works, they all should unless you have the wires mixed up? It may be a very good idea to double check your firing order. You may have two holes misfiring and not realize it! It is: 1-8-4-3-6-5-7-2
If that is correct, it is highly likely that you either have a vacuum leak at that intake port, or that injector is plugged or not firing. Unfortunately it is difficult to get at the injectors to check them. You have to remove the intake plenum, and once you've gone this far, you'll be replacing the gaskets, you may as well stick another injector in just to cover your ****. You can by them separately.
Thinking out loud- How many miles? - I'd really want to check for anything mounted near that runner that could be a vacuum leak.
If you do end up taking this apart, These are a really funny looking style of injector. They are mounted in a well in the center of the plenum. They are unlike typical Bosch style injectors, they have a solenoid valve that releases fuel into a tube that has a poppet valve on the end that is kind of willy nilly clipped into a hole in the intake port. These injectors do have some history of the poppet valve sticking. I believe I've seen a GM bulletin recommending a fuel injection cleaner chemical just for this problem.
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