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I have a 98 Lincoln Mark VIII LSC with 166,xxx miles, I take good care of it, and have been having fun modding the engine. Here is my problem when driving onto on ramps, doing about 35-45, I notice that when I come out of the turn and accelerate to get up to speed, more often than not the rpm's will drop to around 1,000-1200, it starts chugging a little and there is no power for about five or six seconds, some times to the point of almost stalling. The weird part is that I can't get to do that on any other driving situations, I even took it on a road coarse and had no problems.
If it was the transmission wouldn't the rpm's be jumping. I think this is engine because the rpm's drop and there is no/ little response from the engine
If it was the transmission wouldn't the rpm's be jumping. I think this is engine because the rpm's drop and there is no/ little response from the engine
It depends. Sometimes it can cause hesitation to the point of stalling as well. However, you are talking about a very specific time when it does it, I imagine you would have a similar issue flooring it no matter the circumstance if it was the transmission.
What happens if you let off and then suddenly floor it driving down the road at 35-45? I would expect the same thing.
If not, than it's a really odd issue and I'm not sure what to tell you. If it was engine, you would think it would be easily replicatable. If you think it's engine, I would be looking at spark and fuel delivery.
Sounds like fuel sloshing away from the pickup. Does it do it on a full tank? Can you replicate the stalling around turns? What about straight, steep hills? If you haven't been able to replicate it I assume this is a relatively new problem... keep driving, observe all of the variables that come into play.
I can only get it to do it on on-ramps. I tried to get it to do it on a race track and nothing happened....fuel pump is a year old.....i wonder if it could be that
which could be caused by a fuel pump pick-up out of position
or a wiring harness that is being stressed when the car is on the ramp, hence causing a lack of signal to a component or power supply interruption
perhaps a test drive with a diagnostic scope, such as an older Snap-On Counselor, which can be kept in the car and observed while driving ... to verify the real-time electronic controls of the car's computer system. What you need is an observer to monitor the engine control functions as you drive the car to replicate the failure mode. 5-6 seconds of poor performance should be long enough to show an abnormality of some sort on the scope.
Or you could connect a good high quality fuel pressure gauge to the fuel line schrader valve and run the gauge between the cowl and hood, making sure the hose is routed so it won't touch anything hot. Lay it flat on the windshield and hold the gauge in place with a piece of duct tape. The hood should still shut.
Drive it around and observe the gauge through the windshield noting the pressure at idle, acceleration, stopping etc. Then go find your favorite ramp and try to make it act up. If it does, you should be able to see if losing fuel pressure is the problem.
I've driven customers cars that way for up to three days to confirm a fuel delivery problem.
Another remote possibility is a partially clogged exhaust system. A baffle in the muffler or maybe even the converters. Who knows?
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