Question about 1990 Jeep Cherokee Limited

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Rpms runs to high in my jeep cherokee

I have a 1990 jeep cherokee . The problem im having is sometimes lately the rpm.s rev real high. and no matter what I try to get it back to normal it doesnt work. The throttel not stuck but thats what it sounds like. Then a couple days later it will be fine. Any ideas . Thanks

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  • jsjeep Dec 22, 2008

    my jeep also has a high rmp. i had it goin about 45mph without giving it any gas once. then when i shut it off and let it sit for like 5mins it is fine. but now i start it since it is so cold out that the rpms go up to 2500 and this morning it started to leak gas from the engine.

  • alpha_003 Jan 10, 2009

    i have a similar problem.....when i start my jeep the rpms are low(around 350-500) but when it warms up it idles around 1500-1750rpm!!

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Check / Replace the Throttle Postition Sensor. I had the same problem a couple years ago

Posted on Dec 10, 2008

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You should check your vacuum lines for cracks, also use zip ties on them to ensure a very tight seal.

Posted on Nov 24, 2008

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I own a 1990 jeep Cherokee 4.0L and I'm having rpm problems. Once it's warmed up and I've been driving for around 30 to 45 minutes the rpms wanna go everywhere and I can hardly drive. Thanks


are you saying idle controls are out of control
or engine power lacks.
?
here is everywhere?
if RPM Rises and car does not speed up that is transmission slip.
driveablity problems are the most complex. cept maybe noise.

we cant test drive it ,so it behoove that you
tell the full story , driving all those complex details. of speed, power, misfiring, etc.
even RPM matters. real numbers stated.

If car is stick shift?, like mine was that year
then its bad clutch if it slips.

why not ask a shop this. (live help is amazing)
or get a tune up,, if you skip them.

Nov 10, 2016 | Jeep Cherokee Cars & Trucks

1 Answer

Rpms runnning over 2000 jeep cherokee laredo 1997


Maybe the Throttle Position Sensor (TPS) if the computer thinks it is all the way to the floor then the gears would not shift until the engine RPM is real high. Also would not be able to determine the car is supposed to be idling. Do you have a check engine light? If you do this may come up on a scanner.

Feb 12, 2012 | 1997 Jeep Grand Cherokee

2 Answers

My grang cherokee2002 us spec, while driving trnz changes fine but when cick down or full excelrate and RPM reaches 4.5 or 5 engine is loosing power and getting noisy and RPM not going more, while gear on...


You are hitting the rev limiter top range, which cuts off your ignition.

I have a 2001 Grand Cherokee and the problem drives me crazy, but it is the way the car is designed- as soon as you hit the rev limit, it shuts down ignition and your jeep will "buck" - a real pain when you are trying to accelerate into traffic!

You have the 4.0L straight six engine, yes?

If so, please take my advice and learn to live with the minor annoyance of the rev limiter- that engine is IMHO the best Chrysler ever made (nearly "bulletproof"!) and it was so reliable you cannot even get it in a jeep now! For decades, that engine was used in welders, tractors, generators...and yes, jeeps... and it is a favorite among mechanics for its durability!

Feb 01, 2011 | 2002 Jeep Grand Cherokee

1 Answer

90 Cherokee Laredo 4.0 Replaced the throttle body, and fuel pump. When it starts it revs up to 2100 RPM's then dies.


Fuel system should be ok. check for air leaks around throttle body, make sure TBI gasket or o-ring are not sucking air which will cause high RPM's, also check for vaccum leaks.

Nov 16, 2009 | 1990 Jeep Cherokee Limited

2 Answers

90 inline 6 will start but not idle


check the connection on the battery but it dose sound like a alternator problem

Jul 23, 2009 | 1998 Jeep Cherokee

1 Answer

96 Jeep Cherokee RPM Surge While Driving


If the problem began before you changed the plugs that they are likely OK...Some engines "like" certain brand plugs better than others. You may have a weak ignition coil. Poor spark will generally show up at higher rpm's. Spark should be blue and have good "snap" to it and should easily bridge a 1/4" gap or better. If fuel was contaminated, it should show up at lower rpm's as well. System cleaners sometimes work but often are added far too late to do any good. (tank can hold up to a gallon of water without noticing it.) I use 3oz of acetone and one oz marvel oil per 10 gallons of fuel about once a month...cheaper and more effective than most cleaners. (and does not "melt" gaskets and seals as legend has it) The vehicle speed sensor can also give you problems but needs testing to determine if it's got any problems.
It's difficult to diagnose by remote control, but I hope you benefit form something here!

Jun 12, 2009 | 1996 Jeep Cherokee

1 Answer

Will idle high sometimes up to 3000 rpms when driving or sitting still


I have the same Jeep and same problem. The engine was running rough. The Jeep dealer fixed a vacum problem in the manifold and they then decarbonized and cleaned the fuel injectors. After these repairs the idle problem began, it would spike to 2000 rpm while sitting at idle, sometimes it would slowly come down, sometimes I would have to tap the accelerator. I took it back in and they then replaced the throttle motor and reprogrammed the PCM (Power Control Module?) Still same problem. Now they suspect a another vacuum leak and I am taking it back in on Tuesday, will let you know what happens, $ 1,300 so far.

Jun 02, 2009 | 1999 Jeep Wrangler

1 Answer

2004 jeep grand cherokee idling problem. Revs motor 200 to 500 rpms higher while driving.


I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.

May 31, 2009 | 2004 Jeep Grand Cherokee

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