Question about 1998 Ford Escort

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1998 ford escort 1.8 16v zetec. My vehicle missfires erratically, the rpm goes from 1200 to 700. any ideas as to the cause. Thanks for any help. Pete

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Hi pete this could be a few things, but i will just start with the simple ones, MAF sensor,you can try unplugging it and seeing if the car idles normally if it does then that will be that if you can get access to a diagnostics system even better, check to see if the MAF is letting enough air into the system or even too much air would do it, knock sensor is another thing and also the o2 sensor on the exhaust, you may not be showing any error codes from the ECU but try that anyway and also the throttle position sensor, you will unfortunately only be able to check these through the diagnostic system but these are the things that will make it run unevenly...hope this helps

Posted on May 30, 2010

Testimonial: "Thanks for your help and advice, with this knowledge i will probably solve the problem. Thanks Pete "

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Small vacuum hose on intake manifold gets soft and causes a vacuum leak which in turn causes your engine to surge.

Posted on May 31, 2010

Testimonial: "Thanks for your help most appreciated, however i have established it is one of the censors faulty and all i have to do is find out which one!!! Get some from the scrappy and trial and error i suppose as the car is not worth paying out good money on,thanks again. Pete "

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