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Ask Terry S. Trent Your Own Question
Terry S. Trent
Terry S. Trent, Auto Mechanic
Category: Car
Satisfied Customers: 378
Experience:  Associates Degree Automotive Technologies
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1992 Mazda 626: reving engine (rpm..rev..Check Engine Light..car back

Customer Question

My 1992 Mazda 626 has a reving engine (RPM's) problem and can shut down at a red light or in mixed speed heavy traffic any time, car can rev up and down violently when at idle also; is this an Intake Air Temperature (IAT) Sensor replacement fix and/or a Idle speed Control (ISC) Valve replacement fix?

Also the Check Engine Light is almost always on, is this related to above problem? Is it also electrically related, I knowthey fooled around with wiring on this car back when it was new from original owner.
Submitted: 7 years ago.
Category: Car
Expert:  Terry S. Trent replied 7 years ago.

First thing man, it will really help us if you take your vehilce to the nearest auto parts store and have them check the fault codes for (free) I need to know what the check engine light is telling us.

 

Other questions is this engine (carbeurated) or (fuel injiected) and is it a (turbo) ?

Customer: replied 7 years ago.

I t is fuel injected, NON-Turbo 4 cylinder;

recently had a rebuilt transmission put in - working fine

A New Starter put in

New Battery

Expert:  Terry S. Trent replied 7 years ago.
You never had ithis vehicle checked for fault codes? That would really help if I knew what the fault CODE/S are...
Customer: replied 7 years ago.
Unfortunately no, I will have to wait until 12/01 to do that, it is late now
Expert:  Terry S. Trent replied 7 years ago.

Do you mind? Without that information it only gives me a (W/O CODES) without codes symptom chart and (W/Codes) with codes it will give us exact testing procedures. I really need to know exactly what we are dealing with especialy if they messed with the wiring.

 

We really need to know the (Fault Codes)...

 

Take a look at some of the possible causes for (fast idle speed) for example.

 

graphic

Customer: replied 7 years ago.
I will hopefully get the exact fault codes tomorrow
Expert:  Terry S. Trent replied 7 years ago.
OK good... We talk more in the morning I will be on all day...