Question about 2004 Jeep Grand Cherokee

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After worming up idle surges and it down shifts hard when driving. Run good when cold. Today after short trip. It surged over 1300 RPM. sitting in the driveway. It seems to be getting worst. 04 Gand Cherokee 4.7 HO

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Without a data reading scan tool and the truck in front of me, i can give a very likely cause, that would be the TPS (throttle position sensor) it tells the computer where your foot is at all times and they get testy over time giving the computer very erratic information, think garbage in/garbage out, i recommend replacing the TPS disconnecting the battery for 10 minutes and seeing what happens, WARNING: only an OEM or very high quality sensor(such as NAPA,ACdelcoetc..) is recommended cheap sensors cause more issues than they are worth remember you get what you pay for

Posted on Jun 05, 2011

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Posted on Jan 02, 2017

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2 Answers

What is causing the fast Idle and slowing down


well gee, there are 50 reasons.
did you scan the PCM yet, if not ,why not?
when the idle surges, that means.
NO RPM ranges stated, if super low rpm check EGR.

1: engine lean and ISC dead, or cant handle the huge engine power drop..The PCM can even make this worse!, buy hunting the ISC to find spec, idle and failing... to...
2: or any of 50 other things causing huge engine power drop and PCM can't maintain idle controls.
super lean burn.(bogging)
super rich burn, misfire for 50 reasons.

i cant hear your engine,nor feel it, or see it shake from gross misfiring.
no can i drive it and see/feel power loss,
can I?
asking net bunny's this (blind as bats)
is "OVER THE TOP" no?
so here , ill toss the dice for you
and guess gross misfiring.
ever get a tuneup this decade, if not bingo , no?

and the others...

http://jeepdied.com/Misfire101.html

link even has the 50 cause list, to show the futility of guessing!
we do 1 to 10 tests. and find it.
for sure.

as you can see EFI systems are complex.
gue$$ is not only expensive but can net you 2 problems easy.

Feb 05, 2016 | 2002 Jeep Grand Cherokee

2 Answers

While driving my jeep seems to be shifting gears the rpms rev up and then goes back down almost as if surging I changed speed sensor as a guess so far but did not work?


old 1995
we need vastly more symptoms then that,sorry
if the engine surges, that is first. (surges in 1 gear)
but if a transmission down shifts that is normal, rpm rises
(after all its a lower gear) (higher numeric ratio)
find any machanic in town
ask him test drive it.!
10 min.later he wilt tell you
its trans issues.
or its engine, super easy this is driving.

seems you can not, and learning is 1hour in car class..or 10x that lacking facts of drive train functions.


stop guessing. why spend cash on a useless sensor now.
spend cash on $1 shop diagnosis and WIN.
i promise !

or get it scanned.
and post all those DTC errors. P0700? and more.

Jan 24, 2016 | 1995 Jeep Grand Cherokee

1 Answer

Why does idle speed surge?


Thread: 6.0 V12 XJS High RPM When Warm - Jaguar Forum.co.uk

www.jaguarforum.com/showthread.php?t=54266
Mar 3, 2013 - I recently bought a 1993 6.0 V12 XJS and when it is started from cold it runs ... to 1300 RPM so it wants to surge forward when braking which is strange. ...Classics · XJS 3.6,4.0,5.3 & 6.0; 6.0 V12 XJS High RPM When Warm ... You might want to adjust the aux (extra) air valve to bring the idle speed down.

Sep 25, 2015 | 1989 Jaguar XJS 5.3

2 Answers

Shifting from drive to neutral rpm remains high


Take it to a qualified repair shop , Thinking ??? Also was thinking the MAF sensor or Intake Air sensor might be faulty . TESTING IS THE WAY TO A PROPER FIX !!!!!

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Check your vacuum lines for leaks. Symptoms suggest vacuum leak.

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I have a 1991 pontiac trans sport with a cold start engine surge. At cold start up the engine will increase and decrease in the rpm and sometime die but ofter the van worms up it seems to run ok.


remove and clean IAC ( idle air control ), this is what controls idling on to days cars. if this does not help a lot, check or replace coolant tempurature sensor. it may be bad, if it is, it will think the engine is always warm and send wrong info to pcm. good-day ! and may god bless. you can also have a vaccumn leak ! if check engine light is on, get it scanned to know what area is causing the problem.

Oct 16, 2011 | 1991 Pontiac Trans Sport

1 Answer

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Certainly sounds like the o2 sensors have become contaminated and are not acting as fast as they used to , or are supposed to.

Apr 24, 2009 | 2001 Toyota Celica

1 Answer

Engine surging high rpms at stop signs/lights...


the idle air control solenoid or a vacuum leak on backside of intake the hose that goes to pcv valve.they are both common problems on this car.check for vacuum leak firstthanks for your question....

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1 Answer

1996 Ford Thundrbird- RPM Surging


hello first thing you want to do check for a vacuum leak arond the throttle body or intake if every thing checks out good have your THROTTLE POSITIONING SENSOR (TPS )sensor checked for out of range goodluck please rate

Oct 02, 2008 | 1989 Ford Thunderbird

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