1992 Mazda B2200

CHAPYCHARMS

MEMBER
1992 MAZDA B2200

Engine Performance problem
1992 Mazda b2200 4 cyl Two Wheel Drive Manual

i have a mazda 1992 b2200 with 228000 kms. This started about two weeks ago. It starts ok but idles high. When you give it fuel it wants to die. Let the fuel go and it reves high again. We did a fuel pressure test, a compression test on all cylinders, and a vacuum test and everything is fine. We also changed the fuel filter, air filter, pcv valve and spark plugs. I had it at the garage and the mechanic couldn't find the problem either. Please help.

5 Replies

RACEFAN966

MECHANIC
5,029 POSTS

I would check the idle speed control valve. Simply unplug it and measure the resistance across the terminals on the valve. The resistance should be 7.7 to 9.3 ohms at or near 73 degrees. Here is a pic of the valve. Also clean the the throttle body and throttle plate with throttle body cleaner. Let me know what you find.

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Saturday, September 26th, 2009 AT 9:02 AM

CHAPYCHARMS

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3 POSTS

I was working on the truck early today for two hours and it was still doing the same thing. I had to clean up my garage as my dad was coming over to get his shocks changed. When I started the truck it ran fine as if there was nothing wrong. I got your responce after this happened could this still be the problem. Right know everything will check out good as it is working. Is there a way to check the high idle or do I have to wait till it screws up again?

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Saturday, September 26th, 2009 AT 1:20 PM

RACEFAN966

MECHANIC
5,029 POSTS

OK you will have to wait till it screws up again to test it. When it does do the test and let me know what you find and we will go from there.

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Monday, September 28th, 2009 AT 1:01 PM

CHAPYCHARMS

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3 POSTS

I have had the problem again and did what you suggested. Evertning is okay as far as the fast idle speed control sensor is concerned. It is still not running properly. My wife told me to scrap it. I am lost for ideas. Is it time to let it go?

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Tuesday, September 29th, 2009 AT 4:46 PM

RACEFAN966

MECHANIC
5,029 POSTS

Ok test the coolant temp sensor. Just unplug it and use an ohm meter and ohm the sensor (not the wire harness). If you do this when it is cold then get me the reading and the air temp at the the time of the test. If this tests good then we will check the TPS next.