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Author Topic: MazdaSpeed Protege 2003  (Read 2694 times)
John Peddy
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« on: January 05, 2014, 12:41:23 PM »

We have finally gotten this little project back on the road; runs pretty good under light to medium throttle. Full throttle gets you a solid whiplash inducing misfire at about 4000rpms and again at about 6000rpms. Through the course of its' resurrection many parts have been replaced just to get it running again; plugs, plug wires/coils, crank position sensor, timing belt and the ECU was replaced by one from another car that was "running great before being rear ended." Anybody out there have experience with these cars. OBD 2 tells me "random misfire"...the misfire is hardly random - happens every time at the same RPM. Any help short of roasting wienies over its glowing embers would be appreciated.
John   
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jloehlein
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« Reply #1 on: January 05, 2014, 01:35:17 PM »

have you checked the timing?  our miata had a pretty bad misfire at higher rpms after i swapped a new motor in, I had retarded the cams 1 tooth when doing the timing belt.  it ran fine part throttle.  i'd check that the cams are in the right position at TDC and then check the ignition timing with a light as well.
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2000 Honda Insight - Daily Driver
1995 Honda Civic CX - Street Mod/HPDE beater
1994 Chevy Caprice wagon w/6 speed - tow vehicle
1991 Mazda Miata (plus parts cars) - LeMons racecar
whiteryder
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« Reply #2 on: January 08, 2014, 03:47:40 PM »


BTW John.... Charlie Passut is trying to track down the Mazda marque trophy.
Do you still have it?
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2002 Honda Passport
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