12-14-2018, 05:48 AM
I have an 87 samurai with a 94 tracker 16v MPFI engine. It has an issue where it will hesitate or stutter while cruising (not accelerating or decelerating).It is pretty consistent. I can't drive for 10 min. without it happening. It's more noticeable after it's warmed up. I have also noticed that the idle speed will sometimes drop from 800 to about 500 periodically when it is warmed up or vary between 800 and 500. not sure if there's any connection between the 2.
I have seen DTC 21 one time and 51 a couple times. but does not regularly occur(I have been driving for weeks with no codes.)
If I unplug the TPS the hesitation/stuttering completely goes away. The idle still drops/varies the same.
If I unplug O2 sensor it doesn't seem to make a difference
If I unplug the MAF sensor the idle goes up a bit (around 800 - 1000) hesitation/stuttering is the same.
I replaced the TPS with a new TPS and it runs the same.
Any ideas?
I have seen DTC 21 one time and 51 a couple times. but does not regularly occur(I have been driving for weeks with no codes.)
If I unplug the TPS the hesitation/stuttering completely goes away. The idle still drops/varies the same.
If I unplug O2 sensor it doesn't seem to make a difference
If I unplug the MAF sensor the idle goes up a bit (around 800 - 1000) hesitation/stuttering is the same.
I replaced the TPS with a new TPS and it runs the same.
Any ideas?