revs limited to 2,800 rpm in 1993 MX-3 (4 cyl)
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revs limited to 2,800 rpm in 1993 MX-3 (4 cyl)
I dont know if anyone here can help, but a friend of mine has an old 1993 MX3 with the 1.6L 5spd. It runs fine except it stumbles when the rpms reach around 2,800 rpms regardless of what gear its in or even if its neautral. Its like theres a rev limiter there but not really. Its like its losing fuel or ignition at that partucluar point in the rpm range. Brandnew cap rotor, plug wires, ecu, map sensor, and distributor have been replaced already. I believe the distributor was replaced with a used one though. no sign of any check engine light. As soon as it stumbles at 2,800 the engine quickly regains and remains running. This problem occurred out of the blue since it has occurred it has been 100% consistent. It seems like an ignition problem of some kind to me, but I'm not a certified mechanic who works on mazdas everyday. Its a beater but its his only mode of transportation and hes a good guy, that I'm trying to help out. thanks in advance.
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weird..... there's something in the intake manifold called VRIS where it alters the runner length to let in more air, which starts to open around there, I believe, but I doubt that'd be the problem.
Maybe it's a bad oxygen sensor or air flow meter? Is this problem there when he floors it? That'd be a helpful test.
Maybe it's a bad oxygen sensor or air flow meter? Is this problem there when he floors it? That'd be a helpful test.
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hmmm, I have a crazy idea
get it to this weird 'limiter' in 5th.. then chuck it into 3rd, and see what happens ?!
maybe its the ECU being silly at this one RPM, and might be fine once you blast past it with a different gear
if the engine is like totally dead after that RPM and the speed just drops back til your at 3000rpm in 3rd now... no damage done I wouldn't have thought as you wont have gone much over 4.5/5k or something.. engine can definately handle it (unless its limiting you to 3k for some specific reason that I dunno about!)
maybe??!! just an idea.....
get it to this weird 'limiter' in 5th.. then chuck it into 3rd, and see what happens ?!
maybe its the ECU being silly at this one RPM, and might be fine once you blast past it with a different gear
if the engine is like totally dead after that RPM and the speed just drops back til your at 3000rpm in 3rd now... no damage done I wouldn't have thought as you wont have gone much over 4.5/5k or something.. engine can definately handle it (unless its limiting you to 3k for some specific reason that I dunno about!)
maybe??!! just an idea.....
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Id try testing your coil.. Could be the problem.. Also, hows your firing order? I know the car shouldent even run but it has happened in the past.. if you have 2 wires messed up the car will run but might have weird problems.. hence the 2500 rpm limiter
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Dont apologize, I was actually wondering about that. I appreciate everyones input. I havent had a chance to even look at the car in a while, but rest assured the details I've given you thus far are pretty accurate I know because I've driven the car once before myself. I'll have him bring it by soon so I can maybe study it again. I might learn a few more things along the way.mx3TT wrote:Replaced that too.(not jacking your thread man sorry.)