Question about 1988 Jeep Cherokee
Books on 88s are hard to find
owned 2, 88s. French REnix, EFI, just plain old sux....
the TPS is near 1vdc at idle.(out pin)
it's just a POT. 5v /\/\/\/\/ground....
the output is the tap lug called throttle angle.
1v is par.
never 4v that is Wide open throttle, 100%
4.64v is power, spec, is 4.5 to 5.5v , 5v is perfect, its just a 5v power regulator in the ECU that runs external sensors.
that is good.
all 88s love to have the ISC stick when it sticks idle screams.
cleaned mine 100s of times. in 300k miles.
then used Siberian gun oil slick on it and ended that.
this gun oil dries and looks like fry plan TEFLON,
the stepper motor jams at the valve cone.
ever 10,000 miles on mine, even both brand new cars.... did.
back to TPS page in the service manual, I have.
"Throttle position sensor is nonadjustable. Only output
voltage can be monitored." (for errors, my comment added.)
that means its learned. never calibrated.
watch out for kids, they hear advance timing and 2x more horse power and they find out later the distributor
is injector sync, and takes a dealer DRB scan tool to set.
leave the distributor alone
the spark timing is carved in the side of the flywheel for ever.
and is not adjustable at all
and that CKP if played with, it is a buggger to re tune,!
its a dang 2 wire Faraday sensor with trick gap setting.
thats it for now..
Posted on Mar 12, 2017
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Posted on Jan 02, 2017
it looks like your engine is having an over rich fuel mixture maybe, thatswhy when you press the pedal to the floor it starts becouse you allow lots of air to help clean the mixture while cranking, also you should have black smoke in the tailpipe until it cleans up and runs fine, i think youre having a leak in one our more injectors you should check them first for proper seal under pressure these is done in an injector test machine, second it may be a defective map sensor these trucks some times have a bad map and dont give a MIL (malfunction indacator lamp) and last but more rare to be is a blocked fuel pressure regulator chek fuel pressure it should be between 38 and 45 psi and it shoul hold these pressure when you turn off the engine if pressure drops fast its injector seal problems or fuel pump check
Posted on Dec 10, 2009
Testimonial: "thanks for the help. ill be working on it tomorrow"
Im jealous! Im basically looking for that rig in the Suburban form. I already have a gas one of that year. The 4x4 stuff is the same regardless and yeah you have to stop to put it in four hi or four low. It is simplicity itself. Less to go wrong in the long run. I like it better then my mothers jeep.
Posted on Mar 30, 2010
Testimonial: "Thank you for the FAST response, I will stop to put my truck into 4 wheel drive. Good luck finding that Suburban. Thanks Again..."
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