Question about 1988 Jeep Cherokee

1 Answer

1988 Cherokee Pioneer 4.0 auto trans. Son drove Jeep for several months, brought it back because it was not running good. Done some testing found the TPS was bad, changed TPS and now it idles fine, give it a little gas and it starts to move, then give it a little more and it Hesitates and stalls unless I give it about half throttle. I have adjusted the TPS Many times. I have 4.64 volts feeding the TPS, I have set it for the 82% difference, and it idles about 2500rpm, The book also gives a number of 4.2 volts, but at 4.2 volts it idles high as well, I have changed this setting MANY Times, I just can't get it to run good. When I first got the Jeep back, it run like the timing was off, I ask my son if he changed the timing and he said No. I am LOST, PLEASE HELP. I am at the Beach and do not have most of my tools with me. Thank You for any Help, Bobby RestoreTractor@aol.com

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Jeep Master
  • 20,706 Answers

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....
then
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,
amazing stuff,
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.
real
quote.
"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

  • _-__-___-_
    _-__-___-_ Mar 12, 2017

    btw just left the beach, so you are my replacement, 30 days on the beach !
    85f every day , nice off shore breeze

×

Ad

4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad
witchertorqu
  • 63 Answers

SOURCE: 1996 jeep cherokee sport 4.0 L it will stall

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"

  • 48 Answers

SOURCE: 96 jeep grand cherokee starts but wont idle

CHECK FUEL REGULATOR ON FUEL INJECTOR RAIL,&ALSO FUEL PUMP, CHARLIE

Posted on Feb 22, 2010

consaka
  • 661 Answers

SOURCE: Hello all, I am new to this forum and I just

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..."

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Jeeps...


Hi. I have a 98 GCL too with the same issue and new H gasket too !

Fully charge battery. Then find the loose ground connector at the negative battery terminal. Remove nut and sand down corrosion on the connector. Reconnect, tighten nut. Check regularly. It's even free ! Good luck.
P.s bet you park on a slope at the bank.

Regards,
Rioconnection

Oct 14, 2012 | 1997 Jeep Grand Cherokee

1 Answer

1988 Cherokee Pioneer 4.0 auto trans. 4x4. My Son drove Jeep for several months, brought it back because it was not running good. Done some testing found the TPS was bad, changed TPS and now it idles fine,...


the tps is not adjustable,
its 1v at idle and 4vdc at wot
its not the TPS.,
it has 3 pins, its just a pot, (a variable resistors is all it is and is cruede)
1 pin is ground. 0v
one pin is 5v, (about) and is POWER> 4.5 to 5.5v typ
the output pin is 1v to 4v, as you advance throttle it does that 1 to 4 gradually.
end TPS , guessing, its autolearned each key on.
i see you are reading the wrong Jeep books, its a 1988 not 1992 to 95

we cant tell you all the tests, and if no tools to do them be silly to pretend you do.. on the beach.
but if timing is off its off. the crank flywheel markes are fixed so those cant be changed,
but the distributor is not spark timed its injector sync timed
so your guess, is wrong, but if was messed with its a impossible for you to correct it lacking a scan tool.


the only words you posted that help are
it starts to move, then give it a little more gas and it Hesitates and stalls unless I give it about half throttle. but totally left off does engine have full power at wide open throttle
if not
then the fuel pressure is way too low.
or cat melted.
or map sensor, vacuum port clogged.

Mar 12, 2017 | 1998 Jeep Cherokee

2 Answers

Where is the fuse for the tranny it takes off in 3 gear it is a 4 speed auto i blow a fuse or some thing thank you bob


The trans has a built in limp mode if it detects a problem. More than likely there is something else wrong,

Try to reset it first. Turn the vehicle on and off 3 full times and then start it and see if it starts out in first. If you then fell it lurch and go back into limp mode have it scanned to see. It could be the trans computer, a sensor or a hard problem internal to the trans. Hope this helps.

28 years rebuilding trans and factory trained by chrysler on that trans.,

Nov 24, 2009 | 1987 Jeep Comanche

1 Answer

1988 4.0 L jeep cherokee. Occasional (once a


Try checking the driver side firewall electrical harness. There was apparently a bulletin issued for problems related to it. I had a somewhat similar problem which was corrected by direct wiring instead of using the harness. This was done at a Jeep dealer.

Jun 14, 2009 | 1988 Jeep Cherokee

2 Answers

1999 jeep grand cherokee all time four wheel drive will not engage


Sounds like the splines on your transfer case gear are ground down

Apr 22, 2009 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Stuck in park


Grinding noises are never a good thing. You didn't say if stick or automatic but I believe your'e talking about an auto. Grinding always indicates some degree of "hard part" damage which requires trans overhaul.
I'd ignore service intervals and change trans fluid and filter at least every 30k. You have done well at 206k but perhaps could have streched it a bit further. Always follow severe service intervals (the manufacturers definition of severe is just about anything other than being parked in the garage) If well maintained, you are the best judge of your vehicles condition and expected lifespan. Consider any previous repair work and ongoing problems (if any) when making decisions. If you have a 4.0 engine I've seen many of these go well over 300K. !!! Good luck with it.

Mar 25, 2009 | 1997 Jeep Grand Cherokee

1 Answer

2000 jeep grand cherokee laredo hesitates in 2nd gear when cold


Is it manual or auto trans? If manual the gear lube is thicker when cold and the syncronizers tend to stick and not slide free for grind free shifting or for locking into gear.
If Auto trans if the jeep is warmed up setting then cycle the gears before driving. If that helps then the fluid is not getting through the valve body properly. It could be metal in the body or filter or cold seals are letting fluid by til the seals warm, expand and hold pressure. I'm assuming trans fluid is good, not old. One item that can lead to poor cold shift in an auto trans is a bad torque convertor. Since it seems to be a second gear issue the second section of the trans could have a bad seal. In an auto trans I'd take to a shop and have a cold pressure test done. They will tell which one is the problem.

Mar 20, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Firing order 1988 Jeep Cherokee Pioneer


assuming you have a 4.0 l6, order is 153624. #1 on cap is at about 4 o'clock when viewed from r/s fender straight on. next time, take wires off one at a time!!!

Dec 28, 2008 | 1989 Jeep Cherokee

2 Answers

1998 jeep cherokee turns over/ no start. broken serpentine


if you are getting fire to the plgs its not the cranksaft sensor...if you arent getting fire you need to replace it they are simple to replace on the jeeps. took my son 5 minutes to change one out

Dec 06, 2008 | 1988 Jeep Cherokee

1 Answer

Transmision


Hi joshdwright, is your trans a AW-4 or a 46RH? the 46RH was set behind the 5.2L engine and is a 4sp/od and the AW-4 is an electronically controlled 4sp automatic. start simple check that trans oil level is good then if you have the AW-4 make sure the the shift cable adjustment is correct/on the 46RH make sure the linkage is assembled properly, after these checks things get a little more complicated so get back to me and let me know what you found out buddy we'll go from there good luck

Nov 11, 2008 | 1994 Jeep Grand Cherokee

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

31 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts

yadayada
yadayada

Level 3 Expert

76051 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Kevin Daniels

Level 3 Expert

1455 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...