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Car with loss of power

Mazda soho 1.4i cvh fuel injection while iddling vehicle runs fine but when we give it gas to go vehicle looses power and i can only get 60km per hour max , checked compression it is fine , fuel is comming through to the injectors , timming is also fine and vehicle is getting spark on all 4 cylinders can you assist me please.

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  • norkemauto Nov 04, 2008

    I HAVE DONE EVERYTHING YOU SUGGESTED INCLUDING REPLACING THE PRESSURE FUEL REGULATOR AND THE PROBLEM PERSISTS . I HAD THE FORD DEALER LOOK AT IT AND THEY ALSO CANNOT FIND THE FAULT . ITS FUNNY WHEN IT REACHES 3000 RPM IT DOES NOT GOE ANY HIGHER AS IF THE ENGINE IS FLOODING . ANY FURTHER SUGESTIONS IM GLAD TO TRY

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It could be that the coil is weak, or the igniter module is faulty (ie not giving the coil enough time to charge), or the fuel filter is blocked, or the exhaust is blocked. I have seen Cat Converters melt down internally and block up the exhaust pipe, causing faults like what you describe. Thats probably the first area i'd check, and easy enough to do so, just remove the Cat from the exhaust and take it for a drive. It'll be noisy, but if it goes heaps better then you know that is the problem. If it doesn't go any better, stick another fuel filter on it (it's probably due for one anyway) and see if that does anything. From there it's probably better to get a mechanic or auto electrician to diagnose the fault. It is also possible that the fuel pressure regulator could be faulty, not keeping sufficient fuel pressure in the fuel rail.

Posted on Nov 02, 2008

  • Mark Stuart
    Mark Stuart Nov 05, 2008

    Strange that the dealer could not find the fault. It sounds like they didn't spend long enough on it, but then it can get pretty expensive for diagnosis sometimes. Did they test the Air flow meter? Can be difficult to test even with dealer equipment, often better to swap for a known good one. The problem there is that second hand parts dealers won't usually let you try one to see if it fixes it without buying it, so unless you know someone with the same type of car and you can swap it, it could be a problem to prove. I think the best idea would be to call around a few specialist auto electrical/electronics companies and see if they have seen the problem before, and can give you some advice. It doesn't sound like a mechanical fault if the items I suggested have not rectified the problem. Sorry I couldn't have been of more help to you, but it is difficult when I don't have the vehicle in front of me, just going off the fault description, even though yours was more comprehensive than most. Good luck with your future repair attempts!

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