I recently did an extensive repair on my 2002 Chevy Venture with a 3.4L engine.I replaced head gaskets, intake manifold gaskets, timing chain and sprockets, including the timing gasket. All ignition components, coils plug wires, plugs, etc., are AC Delco original and new. I went into the engine due to the common intake manifold gasket failure and coolant in the oil.
Here are some symptoms of the “soft” misfire that vehicle experiences. I define “soft” as compared to a harder electrical ignition type misfire. I have included some other information that is not symptomatic, but might be pertinent to trouble shooting the issue.
* The vehicle cranks right away and usually runs smooth at first. Sometimes it will miss a bit right after it starts. At other times it runs very well until warmed up.
* After the vehicle warms up, a rhythmic, ‘loping’ idol sometimes occurs. The car never totally dies. The headlights will slightly dim when the loping occurs.
* The vehicle misses intermittently throughout the driving range.
* It seems to run best at sustained speeds/ interstate, etc.
* The vehicle occasionally stutters at take off in traffic.
* no check engine light has come on.
* vehicle has not totally stalled out.
Any ideas/ trouble shooing pointers would be helpful. I have checked all ground wires. They seems to be tight and in good order.
You must be logged in to reply to this topic.