Question about 2002 Jeep Wrangler

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Jeep starts from standstill with normal rpm to about 40mph. then the engines 'races' rpm at 3,000 and the pseed drops to about 20mph. I installed a dealer purchsed iac, but the problem persist.

The fluid levels and gauges are fine and within normal ranges. the car fells like the clutch is slipping.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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justuscc
  • 360 Answers

SOURCE: 1989 Jeep Idle Races at startup

yes its the iac "idle air control" they go bad also loose batt conections cause this problem good luck

Posted on Sep 20, 2008

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  • 41 Answers

SOURCE: no heat when car not moving

Ok, judging from what you've said it sounds like a vacuum issue. The temperature controls are activated by vacuum which is produced by the engine. Look for small hoses that lead from the intake manifold to the firewall, check them and make sure they are not broken, disconnected, or leaking.  The vacuum directly controls the doors inside your dashboard which push the air to the heater core. Also make sure that the coolant hoses going to and from the firewall are hot.  If all that checks out, then the controls inside the car may have gone bad, or may have become disconnected from the vacuum supply, or the actuator door inside the dash is stuck or broken.

Posted on Dec 23, 2008

yotaguy
  • 232 Answers

SOURCE: low battery gauge indicated

Not necessarily,this can also be caused by poor battery cable connections or a bad battery cable or a bad connection to the gauge or just a bad gauge.Check or have them checked first,and then have the alternator output tested,a voltmeter connected at the battery posts should measure 14.5 to 14.8 volts at an idle,any lower than this than the alternator is the problem.

Posted on May 30, 2009

  • 295 Answers

SOURCE: check engine code P0740 (torque conv clutch no rpm

Low fluid pressure to the torque converter Have seen this before. I first try to flush the fluid and replace the filter fixed the problem most of the time. If that doesn't work u need a new torque converter.

Posted on Jul 20, 2009

  • 1 Answer

SOURCE: Oil pressure gauge

the solutionit is the oil pump sensor (if gage goes up and down and gage light blinks).

Posted on Nov 06, 2009

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1 Answer

Not all the time but when I start the car it starts very hard. When it starts hard like that and I wait a few second and put it into gear it slams into gear and sometimes won't move.


get it serviced?
hard starts are usually never getting a tuneup, (like spark plugs?)
slamming in to gear is normal if RPM is too high in park, is it.
wont move , in any gear, car wont move even in reverse.
and RPM of engine does what , sticks low, like 800 rpm
or screams at the advancement of right foot.
need lots of details. we cant drive car, but if could in 5min flat all that is clear,
eg:
transmission slips
engine weak
engine racing in park too high.
wont start and misfires when it does.
is fuel fresh, not year old.
ever get a new air filter and fuel filter. if filter is outside tank.

Apr 21, 2015 | 2007 Jeep Compass 2.0

1 Answer

The tachometer shows 900 RPM on idle position but as i put the car in gear and release the clutch the RPM drops and u have to race the car manually through accelerator pedal.recomend the diagnostics a


The engine does not need to be raced when cold

The vehicles computer will adjust the idle according
to how the manufacture programmed it

After about one mine or so, the idle on most vehicles
comes down to approx 750RPM, generically speaking

When you put the car in gear,assuming it is an automatic,
the rpm will drop a 100 at most & may be adjusted by the
computer, just as it does when you put the A/C on. That is
to compensate for the change in engine load

You should be waiting for the rpm to come down to 650 to
800 & then a couple more minutes for some temp to come
up, before driving off. In cold weather wait at least 5 min or more

I think your vehicle is not working correctly, or you not explaining
it in a way I understand what answer you want

Sep 04, 2012 | Toyota Cars & Trucks

1 Answer

When i start the car the engine racces to 2500 rpm why?


This is normal idle control strategy, it races up to keep the engine from stalling out until it stabilizes, if it doesn't drop back to normal idle speed of about 600 RPM after a few seconds (longer on cold start up) then you need to have the electronics tested to see what the problem is.

Aug 08, 2012 | 2000 Mitsubishi Galant

1 Answer

When I start my 2001 jeep grand cherokee the engine will "race" to a high rpm and then go back to normal. Then as I drive the rpm's will jump and go up and down especially when I drive on the interstate. ...


Make sure the vacuum hose has no leaks, or replace the hose if it looks tatty good luck, a fault finder plug in tool should tell you when plugged in to the cars management socket good luck colin

Jun 13, 2017 | 2001 Jeep Grand Cherokee

2 Answers

I was wondering what rpm should my tacometer be at when going 70 mph? it seems high and im not sure if transmission is dropping into the final gear. the overdrive doesnt work either, is it stuck in...


Cruising speed rpm should be roughly 2200 rpm If OD (lockup) is not engaging it will be running at about 3,000rpm.
If it was staying engaged, you would not have a problem at cruising speed but would be "lugging" when taking off from a standstill. OD should come on at about 45mph and the tach should show a drop in rpm.

Apr 20, 2010 | 1999 Jeep Grand Cherokee

2 Answers

Cold engine, idle rpm 1200 is this normal? 2002 Toyota Carollia


you need to replace the throttle position sensor on the intake.

Dec 16, 2009 | 2001 Toyota Corolla

1 Answer

I have 2002 audit quattro TT with 180k miles. When I do a normal acceleration the car surges and rpm drop but pick back up. If I accel hard it runs fine. Also at idle at times it varies 200 rpm like a


this sounds similar to a problem i had. as the rpm went over 2000 the engine would stop for a split second and then kick back in.
after a few days looking my garage finally found the problem was a faulty air mass meter.
this cost me £200 in total to be repaired.

May 06, 2009 | 2002 Audi TT

1 Answer

1989 Jeep Idle Races at startup


yes its the iac "idle air control" they go bad also loose batt conections cause this problem good luck

Sep 20, 2008 | 1989 Jeep Cherokee

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