Question about 1999 Toyota 4Runner

1 Answer


I have a 99 4 runner and rpm's change on idle and sometimes stalls, no check engine light on. I cleaned the throattle body allready and also replaced the air flow sensor but still have the same problem, we replaced the timing belt about a month ago and was working find for the first 2 weeks but started having this problem

Posted by on

  • 6 more comments 
  • muffy p duff Jul 09, 2008

    installed mass air flow did not correct problem, throttle position sensor replaced did not fix. Replacing EGR fix problem? Wondering if Catalytic convert may be the problem? 

  • William Turner
    William Turner Jul 13, 2008

    1989 GMC Pickup, 350 engine

    Engine stall while sitting idle. Already been tuned-up and replaced Idle Air Control Valve.

  • Anonymous Jul 16, 2008

    I have a 1999 4 Runner (automatic). Idles fine. tune up done. bugs out when vehicle shifts to 2nd. help needed.

  • Carl of PNW Jul 19, 2008

    At idle, the engine rpm's fluctuate. On a slow accelerate the fluctuation continues but eventually it smooths out.

  • coopya Oct 25, 2008

    I have the same problem, where the rpm's will drop to about 450 rpm and if I have the A/C on, the compressor will kick on and cause the idle speed to increase and prevent stalling. I had the air flow sensor replaced and timing belt/water pump replaced within the last month. I have 200k miles and would like to put another 100k miles. My next steps are to replace the egr valve and check for any vacuum leaks. any suggestions would be appreciated.

  • Anonymous Nov 19, 2008

    Stalls in Idle...

  • ahchow Nov 25, 2008

    I have the same issue with a 2000 Toyota 4Runner, SR5 4WD.... just recently replaced the timing belt and got a 90K service. The problem happens after a complete stop, the engine would stall while the car is stopped and stationary. I tried replacing the idle control valve and the ECT sensor... but the problem is still happening (just two days after replacing the ECT sensor!)

    If anyone has a solution to this, please help!



  • annmadison
    annmadison Aug 02, 2012

    I had the same problem on my '99 4runner. It would stall when idling and no check engine light would come on, until this weekend. After a few months of guessing, it looks like it is the vacuum switching valve. My mechanic believes it was due to topping off the tank when I fill up with gas.



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 148 Answers

Try the egr valve

Posted on Jul 07, 2008


1 Suggested Answer

  • 2 Answers

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

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.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Why it stalls at stops and low speeds

accord stalling on every stop. (1/2) - EricTheCarGuy ...
The car runs good but stalls every time i come to a stop. ... a stop then it diesagain.only on the stops does the idle drop very low to the point of stalling.what ... only when I start slowing down and come to a complete stop RPM's go down and the cardies. ... The popular Honda Civic and Accord vehicles share many powertrain ...

1998 Honda Accord loses rpm/ stalls coming to a stop ...
Jan 10, 2013 - I just bought a 1998 4 cyl 2.3 L Honda Accord two days ago. ... 1998Honda Accord loses rpm/ stalls coming to a stop. .... Is clockwise high idle or low idle? all in all i probable rotated counterclockwide 1.5 or 2 turns. maybe this ...

1999 Accord, 130k+, stalls when slowing to a stop - Honda Accord ... > ... > General > General Tech Help
Mar 10, 2010 - My fiancee's '99 Accord EX Coupe 4-cylinder automatic, with 130,000+ miles, has recently (in .... No low RPM & feeling like it's GOING TO stall.

99 Honda Accord - Strange Stalling Issues! HELP!
My 1999 Honda Accord is having sporadic stalling problems. I've noticed a pattern. Itstalls while going slow speeds and stop and go traffic, etc. The engine just ...

Stalling or Low Engine Idle Speed Due to Dirty ... - Repair

Jan 02, 2016 | 1999 Honda Accord

3 Answers

4Runner stalls when coming to a stop

check the idle control valve, well there's really no way you can test it but you can try cleaning it. if you notice any difference after you clean it, buy a new one. best luck to you.

Dec 28, 2014 | Cars & Trucks

2 Answers

Stalling issue?

This sounds like the idle control valve or stepper motor as it's sometimes called needing a good clean out or replacement. When faulty this would cause all the symptoms you are describing.

Aug 10, 2017 | 2003 Ford F250 Super Duty Crew Cab

2 Answers

Camry stalling

Fuel filter,air filter,IAC sensor,Bring up low idle at throttle body is small set screw.

Jun 12, 2013 | Cars & Trucks

1 Answer

My 99 malibu starts and dies right away. It won't stay on unless I keep the gas pedal down and rpm above 1500

the ( iac ) idle air control is sticking and needs cleaned. heres how to clean. locate it on the throttle body, remove wire connector, remove the torx screws that hold it on. when off of car. clean valve on end you can use a old toothbrush or similar to do this. do not push in on valve it will mess up idle setting. on the 3.1 the setting is 1 and 1/8 from tip of valve to body of iac. you can use gumout spray or throttlebody cleaner. here are a few symtoms-- stalls after starts, when cold or hot. stalling on deceleration, stalls at idle, unstable idle, low idle, or stuck on high idle. hope this helps !

Jan 22, 2011 | 1999 Chevrolet Malibu

1 Answer

My toledo v5 has a jumpy idle ive changed maf sensor cleaned throttle body changed engine temp sender still no luck jumps between 600-1200 rpm on idle never stalls thanks for any help

Do you perhaps have a small exhaust leak? Check ahead of the O2 sensor. If the exhaust can **** fresh air in it can't give the computer an accurate reading and the engine will rev up and down at idle. Hope this helps.

May 09, 2010 | 1999 Volkswagen Golf

1 Answer

Chevy S10 Pick 1995 - Sputters and almost stalls when accelerating.

You could have a dirty EGR valve, you can re move it from the manifold and clean it with Throttle body cleaner. Might as well buy two cans, since your cleaning the EGR, might as well clean out the throttle body too.
Spray the throttle body cleaner in to the throttle body with the engine running and try to keep it at 1000 rpm and then to 1500 rpm as you clean out the throttle body and let it idle down for 2 min then turn the engine off. Then turn the engine to the run position for 10 seconds and start and let idle, ro for a test drive and hope that solved the problem, if not there a few more things we can do which will consist for tune up.
Note: Clean the EGR first so you don't burn your self since the engine would still be cool before you clean the Throttle body.
Good luck and keep me posted.

Jun 01, 2009 | 1995 Chevrolet S-10 CA Edition

3 Answers

Rough idle stalls at low rpm's

check your transmission fluid,the motor will stall when fluid is low

Dec 06, 2008 | 1996 Jeep Grand Cherokee

Not finding what you are looking for?
1999 Toyota 4Runner Logo

814 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

79024 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

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

Answer questions

Manuals & User Guides