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Please help my 2002 path engine problems!
The problem is intermittent consistently so. I drive 3 miles each way to work, on the highway. The problem can happen at any time on my drive, and is not related to temperature of the engine or outside. It goes like this:
· Running fine on the highway. Lots of power. I can increase speed from 110km/hr to 130km/hr by just applying a little bit of gas. The truck will not have to downshift to do this increase in speed. The rpm stay consistent around 2500.
· The problem starts (usually easiest to notice when cruising at around 120km/hr) with the rpm dropping by about 200rpm. The engine starts to run rough (quick and faint sputters). Sometimes, although rarely, the speed drops a bit. I try to increase speed and the rpm’s won’t move up at all, and the exhaust gets very loud. Finally, if I floor the gas the truck downshifts and speed increases slowly.
· Once this problem starts on a run it rarely corrects itself. I have so far replaced the mass airflow sensor, and have had all sensors on the truck checked and replaced. One mechanic said my fuel filter was clogged completely (even though I’m sure it was replaced regularly), and it seemed to have fixed it for about two weeks. Another mechanic replaced some sensors, and that also fixed the problem for about two weeks. I maintained a log of engine performance to verify that each mechanic’s work seemed to have fixed the problem for about two weeks, but it comes back.