Engine Performance problem
2002 Mazda Protege 4 cyl Front Wheel Drive Manual 96000 miles
I have a 2002 Mazda Protege 5 that has 96000 miles on it. I bought this car new and have never had any problem with it until now. I had the timing belt, tensioners, waterpump, spark plugs, crank seal, & valve cover gasket replaced by a local garage with an outstanding rep. Just after I got the car back it started to do a weird thing. The car will be running just fine when out of the blue it will loose power and start running rough like a severe mis-fire. Here is the weird thing, it goes away as quickly as it came on. Pushing in the clutch and tapping the throttle seems to help clear it up. The check engine light begins to flash and then turns solid and stays on until I reset it with my code reader. The only code it reads is P300 (random Mis-Fire). After I reset it the car runs fine and it won't not even do it's little rough/loose of power thing but the check engine light will come back on in about 15 minutes. You can't feel any rough engine idle or power lose. I took it back to the garage twice and they can't get it to do it's weird mis-fire thing. They see the check engine light that won't go away after reset but they can't find anything wrong, all voltages and parameters are within spec. They even had the car for two weeks but just gave up on it with no charges due. They said bring it back when it dies or is just about to, it would be easier to find the problem then. After driving it like this for a few weeks a new code has come up for " bad warm-up catalist". Which tells me the cat converter has gone south due to unburnt gasoline from the mis-fire getting into it. I'm completely lost at this point, what should I look at to cure this problem? EGR valve, Ignition coils, etc?
Saturday, December 20th, 2008 AT 10:36 PM