which way to go?
Have a 2000 Mercury Grand Marquis 80,000 km. 50,000 Mi.
The following is happening.
When I am accelerating at the 47 km (30 Mi)approx and again at the 67 km (40 Mi) the car "jerks" as if the transmission was slipping.(My guess)
But if I accelerate like as if I was using a manual, listening to the engine, I don't get the slipping.
Transmission specialist suggested to see dealer first as could be wiring problem. His "tester" (ABD) does not give a faulty transmission reading.
So off I went to dealer that sold me the car. Warranty no longer applies. Mechanic tested, confirmed the slippage and said" Ya, this happens to some models" "changed the fluid, ran a road test, and all OK". Well, when I took a trip to NJ 756 km (470 Mi) Car ran fine. but for this slippage if not applying proper gas. This is a vexing situation.
I have purchased ABD (On Board Diagnostic) unit, and get no readings. You would think that "slippage" would leave a code. But NADA.
Mechanic's on board?
Could the wiring be faulty?
That this occurs. How do you test?
I have read, and I did change wire harness on my 88' Buick, which now has 300,000+Km (186M Mi) Son in Law using to go to work and back.City transport only.
Could it be an electrical computer problem?
Having to do with the gas feed to carb?
This would explain the reason having to be "Hard footed" to run smooth.
Ideas! Before I go to my Garage.