1993 Nissan Serena Repair Question
Having hesitation problems off idle and when cruising at 60 mph car is surging
EGR seems to be opening too long. Have you tried cleaning the EGR passages?
Yes I cleaned all egr passages and checked to make sure I was getting exhaust out of all passages and tubes.
Something is telling the computer to keep the EGr opened for longer than necessary and it could be the O2 sensor. If the sensor is not OEM, it can cause such problems.
The other thing to check would be the PCM and MAF. Ensure the TPS is working correctly
Yesterday I bought a brand new bosch oxygen sensor and the car has alot more power but still hesitates. I will check the tps and maf tommorow, Thankyou, KARL
Just installed new tps and adjusted- car runs better and no surging at 60 mph but still hesitates off idle at stop signs.
Did you clean the throttle body?
Yes I cleaned it completly.
Did you check the ignition timing and valve clearances?
What about the MAF?
Timing is set to 10 degrees and vavles have been adjusted, MAF is next on the list. Thankyou for all your help, KARL