Question about 1999 Jeep Wrangler

1 Answer

1999 Jeep wrangler 4.0 engine races

When I start the engine (cold), the engine races so fast I have to shut it off. It does not idle at all.

Posted by rogercteel on

Ad

1 Answer

mike ryner

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 115 Answers

Check the thottle linkage make sure its not stuck open. And check for any large vacuum leaks.

Posted on Apr 04, 2009

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Fast idle cold to hot


to fast hot and too fast cold that it?
well here is normal, its a G16 engine, a Vitara with Sidekick badge.
G16 in cold weather, start and race idle at about 1500 rpm
or more if in ALASKA, you never said that or how cold it is.
the IAC valve is thermal, it and opens more colder, a fact.
the 8valve engine (black steel top) is faster. cold idle
then drops in a few seconds, to 1500rpm
at this time, the ECU brain does NOT control idle speeds at all.
the the engine warms up by virtue of the thermostat
as it warms to 150F to on way to 180f stock temp.
the ECU then takes control of the idle speeds.
got that so far?
so at 180f the idle is 800 rpm (800 is hard coded in the ECU,
ad ECU regulates this, unless you turn on the A.C , and if that happens 1000rpm is called up.
if not the ECU cant control it or the ECU is in limphome mode or worse.

if you insert the diagnostic jumper
does the CEL lamp flash 12s
it must.
see this paper clip this is your only scan tool.
it is crude but that is all you get until 1996.

http://www.fixkick.com/CEL/CEL.html#OBD1codes


Jan 04, 2017 | 1993 Suzuki Sidekick

2 Answers

Fast idle problem 1999 Isuzu Roseo


Code for high idle is different,are you sure was 245?could be 225

Jul 05, 2016 | 1999 Isuzu Rodeo

1 Answer

Truck idles very high when starting


how cold is cold???? In Alaska or Key west?
tell location and bingo, i know. but didnt
all engines race cold for sure EPA regulated ones.
and race faster the colder it is

what is RPM see dash, see dash rpm gauge called the
tachometer, use that to answer
or if no tacho there, ill never know here in the cloud.

no engines size stated


its 85f here.
2000 RPM is easy cold.
here about 1500 cold (85f) but drops fast say 5min.

Dec 25, 2015 | 2002 Suzuki XL-7

1 Answer

Gas pedal gets stuck and keeps the car going cant stop without turning the car off


dont drive it. find the cause and fix it now.
Hot and cold engine or BOTH>?
1995 Tracker, no tranny , no 4wd , on engine options stated.
Exact high RPM in neutral, not stated...... 1500 is normal cold.
keeps going in Neutral. (nah , you have 5 ways to stop any car.
key, hand brake, foot brake and neutral. and with 4wd, 1 more neutral.
keep that in mind driving any car.
this car has up to 3 throttle cables that can stick. and more!

1: floor mats hit the pedal>? ala. Toyota style (lawsuits)
2: the three cables are, throttle. , cruise and A/T transmission kick down cable. if car is M/T and no cruise it has 1 cable.
so disconnect it, throttle fixed? (disconn,. 1 by 1, bingo?

no cure?, then its not the pedal , you meant just high idle.
yes, replace the cable or bad parts three.
ok say its not the cables.. (tests proved that)
the 95 came with 2 engines, 8valves and 16valves,
they work differently (8v love so race, 16v loves to stall)

1: ISC Stuck open, common.
2: 8v, any air leaks at all , will cause super high idle speeds.
3: throttle valve in the throttle body is stuckopen (gunk) or the return spring broken (very very rare the latter,in fact never heard of one breaking)
4: IAC (thermal idle control stuck open ,(my 97 was). and lots more.
5: on the 16v it takes 2 failures. to make high idle.
gross rich running engine (cold engine its normal) and any air leak
once hot the engine can not race unless there is huge overfueling
and an air leak.
6: the 8v has this device on the side of the throttle body.
called a dash pot. its just a fast idle vacuum servo.
if stuck open the engine will scream full time....
7: ECU stuck in limphome, can cause too high idle speeds.

we need to know which engine
http://www.fixkick.com/find-parts.html
8v or 16v first.
then does the idle race hot or cold or both (engine temperatures)
if it races , then how fast?, RPM the dash tachometer tells you that.

it can be as simple as a 50cent hose cracked.
to a dead ISC. (idle speed control) IAC is thermal idle air controller.
the IAC must be closed on a hot engine,
if the the engine never gets hot,it will scream full time.

Feb 13, 2014 | 1995 Geo Tracker

1 Answer

1973 toyota corolla fast idle when cold


TYPICALLY, THERE ARE NO ADJUSTMENTS THATS WHY IT IS ELECTRICALLY CONTROLLED CHECK PINNACLE(RETRACTABE)SCREW AT THROTTLE. FIRST CHECK FOR VOLTAGE FEED ALSO

Jun 24, 2013 | Toyota Celica Cars & Trucks

1 Answer

My 1994 samurai idles really high when I first crank it, but later slow down. is there anyting I can do to ?


From a cold start my sami idles really fast, but as I drive it and the engine warms up it will idle correctly. Is there a way to make it idle slower from a cold start?
what engine ? 1.3 L
carb or EFI? (94 was first year of efi, and many have been converted this old)
but the answer is the same , that is normal.
on car its a fast ilde cam on the carb.
in EFI its on the software and in the IAC thermal valve.

Mar 29, 2013 | 1994 Suzuki Samurai

1 Answer

Idle races when cold


Check your Idle Speed Control Valve,or any vacuum hose leaks.

Aug 24, 2012 | 2001 Jeep Grand Cherokee

1 Answer

What kind of carb does the 76 c10 4x4 come with need to adjust


mcdevito75 here, The fast idle is needed when the engine is cold to make the air and fuel mixture rich to keep the engine running while cold, the carb. choke doew this with a bi-metalic spring in that balck round box on the side of the carb, a screw also hepls keep the choke closed until warm up, this screw can be adjusted tpo control how tight it holds the choke cloesed, here"s how to adjust this screw to slow fast idle speed, Locate on the carb, where the gas pedal connects, have a friend operate the gas pedal with the engine off, once you locate the linkage, you"ll also see 2 screws with springs around them, 1 is for fast idle the other for regular idle, you want the fast idle screw, notice this screw will lay against and Half moon shaped tab, while the other screw lays against a shaft, you need the screw that lays against the half moon shaped tab. Start the engine and step on the gas pedal slightly and relaease, at the screw that lays against this half moon, simply turn it counter clockwise or toward you just 1 2 or 3 turns very slowly, you'll hear the fast idle come down but you don"t want the fast idle to low, listen to the engine very carefully, slow it down just a bit, it should still race though but not out of control. Of course for a full carb, adjustment the shop should handle that., but this info will help.

Mar 29, 2010 | 1978 Chevrolet C1500

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

Not finding what you are looking for?
1999 Jeep Wrangler Logo

Related Topics:

273 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts

Marvin
Marvin

Level 3 Expert

85239 Answers

Mike

Level 3 Expert

4372 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14852 Answers

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

Answer questions

Manuals & User Guides

Loading...