Question about 1995 Toyota 4Runner

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'95 Toy 4-Runner Check Engine light and runs rough at idle

I don't know if these two things have a common cause. I bought my 4 runner in December. It sat for three months as I got it running and legal. Driving home from the auction it ran rough. Spark plugs, leads, dist cap and rotor were pretty burned up when I changed them. Even though it runs rough it passed vehicle emissions test no problem. I ran B-12 Chemtool through first tank of gas and am half way through my second tank. Any suggestions for the rough idle?
The check engine light has been on the whole time. I have been told I can short two pins on the computer diagnostics plug and get the error code. Can anyone tell me which pins and where I can get a list of error codes and what they mean?
Fred from Dallas

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Older post...but, just in case you haven't found anything this is a great article.

Posted on Sep 14, 2009

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95 4 runner rough idle at start

Hi, 1994 4-runner hard-start after 3-4 hrs......All the above are good possibilities and should be checked.....I don't know what changing to E3 means exactly, but if it means changing the spark-plugs, it could be that the plugs are too cold or too hot is probably best to stay with the factory recommended plugs ....some plugs are hot and some are cold ,in case you are not aware of it.......good luck with it....Frankie Don.

May 07, 2014 | 1994 Toyota 4Runner

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1990 toyota four runner running rough no loss of power no check engine light

spark plugs injector cleaner have u been runing with low fuel pump may be on it way try fuel injector cleaner & fill tank 90 plus octane

Dec 22, 2013 | Cars & Trucks

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I have a 99 Toyota 4-runner with check engine light on and stuttering, rough idle, sometimes dying of you don't give it has upon starting. The mass air flow sensor was cleaned and it fixed the problem...

If your check engine light is still on, have you taken it anywhere to get the computer scanned? If you have an O'Reilly's in your area, I know they will scan for free....but I"m sure many other auto stores will too. I believe most of the time when the "check engine" light comes on, it is something to do with you emissions system and you need to have it scanned to see where the issue is.

Feb 11, 2013 | Cars & Trucks

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Replaced IAC valve and erratic reving continues

Sounds like the intake manifold gasket. Easy test. Take engine cleaner, or brake cleaner and with truck running, spray directly onto the INTAKE manifold gasket where it bolts onto the engine. If you hear ANY difference in the idle, up or down, gasket is shot. Very common. If idle doesn't change, spray all the vacuum hoses you can, listening for any change in idle. Let me know how you make out, if it's not that, I can suggest more things, but if I were a betting man, I'd bet that the gasket is the problem.Cheers from Nova Scotia

Jan 27, 2013 | Cars & Trucks

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Check engine light came on. I pulled code P2004 which comes up as the intake manifold runner being stuck open. Just before the check engine light came on, I noticed that when I start the car, the initial...

Hello, The fast idle on Startup is a normal setting for your motor. This is called the "cold start routine" and it is suppose to help create draft in the induction system and warm other components.

The problem with the runner can be from several things. There are Electric solenoids on some of the motors which may be seen as 2 pods on the Intake manifold. The Solenoids are used to either send Vacuum to the runner mechanism or to move metal rods attached to the "runners".

Sometimes the runners with Vacuum solenoids get stuck in one position. You need to check for Vacuum running through the Solenoid. For the type with metal rods that move, Ford used plastic clips to hold the rod shaft to the runner just beneath the place where the Solenoid mounts. The broken plastic clip can be replaced with a paper clip that you need to shape to fit. Or you can buy a Ford part made of plastic which will fail again.

The runner flaps themselves can be gummed up so bad that the Solenoids described earlier just can not move them. This style would need to have the Intake Manifold removed in order for you to lift out the runner plates and clean them.

I am going to explain what a "Runner" is and this should explain why there are several systems put in Ford vehicles. On some Ford engines, the breathing of the engine requires that the Intake manifold has 2 sets of intake passages. A single Intake design could not give both low-end and top-end Performance. The runner moves from one port to another and this is like having 2 Intake manifolds bolted on top of 1 engine.

When the runners can not move because of a malfuction, thats when you get Error Warnings and poor performance.

You need to identify the engine used in your ZX3 if there were optional engines. I wanted to give you a start on your repair with my Solution. You should be able to look at your motor and see which system you have and now know that a Rod-operated sytem can have broken clips, a Vacuum system can have bad Solenoids and so on. I hope this is very useful to you.

Jul 30, 2011 | Ford Focus Cars & Trucks

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Looking to buy a '95 toyota 4 runner. when test

Yes, Bill you are wise to be worried. It may be a simple fix and it may cost over $1,000 to repair. Walk away from this vehicle. There are plenty more out there without this type problem.

Aug 26, 2009 | 1995 Toyota 4Runner

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