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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 2004Mazda Ping
Been hearing some knock out of my 2000 Mazda B2500 4cyl for a while. Mostly during highway runs in a certain RPM band (around 2100). I can gas it up a bit and it goes away. Don't drive it much but the trips are mostly back and forth to work at around 7 miles a trip so the engine does reach operating temps. Took it to a dealer and they said that because of low mileage (18,400) the fuel system was craped up. Did a $260 clean up. On the way back home the engine still knocked. I called the dealer back and they now claim that I will need to drive it a while (at least a tank of gas) before it clears up. Did I get took here or what? > Been hearing some knock out of my 2000 Mazda B2500 4cyl for a while. Mostly > during highway runs in a certain RPM band (around 2100). I can gas it up a [quoted text clipped - 8 lines] > > Did I get took here or what? You got took. Fuel system flushes are useless, in the US at least, all gasoline is mandated to have a detergent in it. They are nothing more than a high cost money waster. And $260 is espically high for one of these, most of the time these flushes are not that expensive. (they are expensive, just not that expensive) Espically with this low a mileage I'd rule out carbon deposits or any other of that sort of thing. I am voting that it's the EGR valve stuck closed. Since emissions components are mandated by law to have an 80K warranty on them the factory should pay for this. An easy way to check this if your state does emissions testing is to run it through the test center and get a report. If it exceeds emissions (which it will if the EGR valve is nonfunctional) then I would go back to the dealer and raise hell. Ted Wouldn't a stuck EGR cause a code or check engine light? I found it to be a little strange that when I mentioned my warranty (good until June 2005) that the service manager suggested that it was a maintenance problem - not a warranty problem - and that it was basically my fault for not driving the hell out of the truck ... all of this before opening the hood. Going to try a different dealer tomorrow and mention the EGR valve. If they find any problems I will post the first dealer's name and address to this group (and the BBB, and Mazda, and everywhere else). > > Been hearing some knock out of my 2000 Mazda B2500 4cyl for a while. > Mostly [quoted text clipped - 33 lines] > > Ted > Wouldn't a stuck EGR cause a code or check engine light? Not necessarily. I owned a '97 mitsubishi that had repeated problems with the EGR valve getting stuck open with carbon/etc. The only code I ever got was "multiple cylinder misfire" and that only happened if I let the problem persist for a long time. I've been told that the ECM can determine if the EGR is not present, though. > Wouldn't a stuck EGR cause a code or check engine light? Maybe, but the one on my 1995 T&C didn't when it failed. All I got were high emissions. I changed the valve and got low emissions. That was a year and a half today. Now, I get low emissions and the check engine light comes on one a month with a failed egr code. Damn valve! :-( A stuck egr allows combustion temps to go high which will assist in causing pinging. Ted |
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