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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

'92 Mazda 929, Problems After Repairs

Q: I’ve just bought a used car. A ‘92 Mazda 929, V6. It ran fine until I picked it up from a local auto repair shop, that specializes in foreign repairs (Japanese cars). The repair shop changed all the belts as well as the timing belt. I wanted to do this since the car just passed 95k miles (have also recently changed the oil, checked fluids, transmission flush and filters). Ironically, when I came to pick it up, it would not start. After about five minutes of trying, pumping it, flooring the gas pedal it started. I have never before had any problems starting it. When I drive off the car hesitates and stumbles during acceleration, also lack of power. Otherwise the engine has a nice sound, and to get it up to speed, I have to accelerate slowly. The repair shop technician also experienced this during his test drive, but said it ran fine on test drive no.2. Well, it did not to me... They said I could come back in a couple of days if I had any problems with it. I went to another repair shop to get a second opinion, they recommended a MotorVac Carbonclean service, what is your opinion on that? Can it by any chance be improper placing of the timing belt? I know it’s difficult, but do you have any suggestions on what problems my car might have and what

A: My impression? The timing belt is improperly positioned, causing the valve timing to be incorrect. A vehicle like yours will run yet exhibit odd driveability problems, while sounding just fine. A reinspection of the timing belt is likely in order.

 
     
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