I have a 1992 Chevy Lumina Euro that has an enigne problem; here is a little background...
about two years ago I have a Jasper over-hauled engine installed (car has about 175 k miles on it). About a year ago I had the transmission overhauled. About eight months ago I had a control module (TP404) and a cam sensor (C55109) replaced. The car worked fine for a couple months after that.
Currently all fluids are topped off and clean
Here are the symptoms and what I have done so far:
The engine starts fine and idles fine. When I apply throttle the engine begins to sputter and backfire at very low rpm, the behavior is similar but not exactly the same as you get when the rev limiter kicks in at high rpm. As the engine warms, I can get slightly higher rpm but not much. the problem kicks in at a low enough rpm that the car cannot be driven safely (can hardly get out of the drive in fact).
As i apply throttle very slowly, I get up to a certain point (guessing about 3k rpm) and it starts to stutter, If I add throttle them, it begins to back-fire. If I place the car in gear, brake and apply throttle, it will let me presss the pedal to the floor as long as i don't exceed the threshold rpm (sorry, no tach so I am only guessing on the rpm). So, based upon that, I am guessing that the problem is not fuel or vacuum but rather ingniion or some electronic control over ignition.
I have managed to drive to two different mechanics. If there is any kind of hill at all, I can only make 15-20 mph, if the road is level or slightly downhill, I can make 50-55 mph tops, no pwer at all though. I took it tfirst to the guy who replaced the fule module. He could not see anything on the analizer but just in case, he did a warranty replacement of the replced module, no help there. He suggested that it might be the catalytic converter. I took it to another place for that, again no-soap.
That guy suggested that it could be the oxygen sensor, I replaced that myself and it did not help. I have also added dry-gas to the tank (which is full by the way) without success.
So, there I am, It appears that whatever the problem is, it is not being described by codes available to an analyzer, I get no "check engine" light, etc. When the fuel module was replaced I had the fuel pump checked and it checked out at that time, I think they checked the fuel filter then too but I am not sure, I will try to find the ticket on that and see.
Anyone who has any idea of what I am up against, I would sure appreciate your input.
Thanks much too all!