Question about 1991 Toyota 4Runner

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91 toyota 4runner 3.0L has very rouh idle, hard

91 toyota 4runner 3.0L has very rouh idle, hard starts and black tailpipe. Runs fine through gears but fuel mileage is affected. Can't find a clear solution to check sensors. Any suggestion on troubleshooting would be appreciated.

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All "TUNE UP' Components MUST Be Eliminated as suspect to go further with Diagnosis. They Should be 1. KNOWN to be or CLOSE to NEW or 2. Recently Replaced.
What you have is Obviously a Engine Performance Related Problem, Thus These Items Must be in very good condition when checking for a Problem here

Posted on Sep 20, 2009

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1 Answer

'92 4runner dies when I put it in gear


Check to see if any vacuum hose fell off off, or electrical connection disconnected while changing the starter

May 11, 2014 | 1992 Toyota 4Runner

1 Answer

Why does my 1992 4runner die when I put it in gear?


that could be an air/fuel problem ,does the engine rev ok when not in gear ? if it does then probably not air/fuel. the autobox speed sensor might be the fault have it checked at a auto trans repair shop

May 11, 2014 | 1992 Toyota 4Runner

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I have a 2008 mercury Milan with nearly 60k miles on it. When I come to a stop the rpm drops by 1000 then recovers quickly. What should I do to fix the problem? Any suggestions will be greatly appreciated.


Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode? http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
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http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
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Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

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Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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Fuel Injection Problem And RPM suddenly increases http://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

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1987 Toyota Camry: RPM Drops going Up hills? http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

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Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

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1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?


http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

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1999 Toyota Camry: Erratic stalling and high engine RPM at idle?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

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1995 Toyota LS: Misfire at idle or low RPM http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

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Lexus RX: Tapping noise under Valve Cover At Low RPM? http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

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These will help.
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Nov 22, 2012 | Cars & Trucks

1 Answer

Driving on the road the RPM goes higher wituout speedind


Check out related help links to troubleshoot these problem:----Click the link below:---Idles Fine but RPM jumps in drive mode?http://technoanswers.blogspot.in/2012/07/idles-fine-but-rpm-jumps-in-drive-mode.html
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--------How to adjust rpm on 2009 dodge charger SRT8?


http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
---------
Engine cuts out at 3000 RPM?http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html

---------

Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

---------
High rpm in neutral? Inconsistant high RPM in neutral?http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

-----------
Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html

--------
Fuel Injection Problem And RPM suddenly increaseshttp://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html

----------
2005 Toyota Highlander: Engine runs hard RPM below 3000?http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html

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1987 Toyota Camry: RPM Drops going Up hills?http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html

-----------
Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html

----------
1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?


http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html

------------
1999 Toyota Camry: Erratic stalling and high engine RPM at idle?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html

---------
1995 Toyota LS: Misfire at idle or low RPMhttp://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

-----------
Lexus RX: Tapping noise under Valve Cover At Low RPM?http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html

----------
These will help.
Thanks.

Nov 22, 2012 | 2008 Toyota Avalon

1 Answer

91 Toyota 4runner stalling


Try to clean the Throttle body of your engine I believe you never did, Also check whether you have also Air Flow Meter which is situated on the Flex Intake Hose of the engine.If so remove it by disconnecting the connector and remove the 2 little screws. Take it in your hands and check the inside where on the one side you will see a small wire surely would be covered on dust. By means of carburettor Cleaner give it a blast after you remove the "O" ring first.Give it a try.

Aug 20, 2012 | 1991 Toyota 4Runner

1 Answer

Rough low idle and black smoke


Bad carb or fuel injection issues- the system is fuel rich (black smoke) and also fuel rich system can make the idle low. Many things can cause this but thses are just a few.

Aug 06, 2012 | 1990 Toyota 4Runner

1 Answer

My toyota 4Runner idels fine when it is in park, but the minute I shift it into drive, before even touching the gas it has a hard shaking idel. What could be wrong?


your problem is the idle air control motor it is not adjusting the idle as you shift out of park, normally engine idle has to be bumped up slightly when in gear. yours is not working must be replaced you will find it at the end of the duct work from the air filter at the intake throttle body.

Nov 16, 2010 | 1995 Toyota 4Runner

1 Answer

91 Toyota 4runner runs rough once warmed up at a idle but does fine going down the road. idles at 500 rpm when warm


ive had a problem like this before it turned out being a shim under the camshaft worn and when idle it wasn't pushing the valve down properly.all it took was shimming it out.might want to check that out pending your mileage.

Jul 13, 2010 | 1991 Toyota 4Runner

1 Answer

Cat or fuel pump problem?


have somebody rev the engine then go to the tailpipe and check if you have strong air comming out. if you have then its not the cat. if its the pump big chance is you cant even start the engine. check the air filter first then the fuel filter. i think youll find the problem there

May 29, 2009 | 1992 Toyota 4Runner

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