Mechanics

ERATIC RUNNING

1991 Nissan Truck

Engine Performance problem
1991 Nissan Truck 4 cyl Four Wheel Drive Manual

stated before, this truck had a dead cylinder, pulled the head and found out someone did a valve job on it before, and sunk the seat to far thus the valve never closed. With that repaired now the engine refuses to run over 2k rpm. Was surging at idle adj. The tps and got the idle right, however it still acts like it's running out of fuel at or above 2k. I tested the tps for dead spots the voltage starts out at 5 and ends at 3 however there is a point where the DMM hits ol but no matter how many times I try it again it is never in the same spot in rotation of the throttle plate. All the plugs are loaded with carbon and massive black smoke out the tp. Fuel pressure is 35 at idle and hits 40 as it starts to surge and lose power and rpm's, MAF?
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Okflyer1
April 30, 2010.




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