88 na hesitation
#1
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88 na hesitation
I have two friends that have 88 SE 5sp NA cars. BOTH of them have the same problem. At full throttle they hesitate bad, at light throttle they will go to redline but when floored they do it. I have check the ignitions, injectors,all the sensors, mas, throttle sensor, fuel pressure, everything checks out. The Factory mazda dia. tool shows no codes. The three grounds in the engine bay( bolt on driver side harness, The 6 prong plug under the trailing coils, and the tranny harness to the firewall. They both have new motors in them and compression is 90 or better all the way around on both motors. We are at 3000 ft. so the compression is within specs. I have checked everything even replaced the ecu with a spare and nothing. IS there a common problem with 88 SE's Or something. Any Ideas will help. Thanks
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ecu ground under intake mani?
there's 4 major grounds, u spoke of 3 except that ecu ground under the intake mani
if its an ecu problem causing that hesitation / stutter ... that's the ground you're looking for ... this weblink saved my car from amazing electrical happenings
http://www.aaroncake.net/rx-7/grounding.htm
if its an ecu problem causing that hesitation / stutter ... that's the ground you're looking for ... this weblink saved my car from amazing electrical happenings
http://www.aaroncake.net/rx-7/grounding.htm
#7
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Clip your ohmmeter on the signal pins of the TPS & AFM.
See if the values make a smooth sweep as you work the plunger or flap.
Any drops or bumps in the sweep of either sensor will freak the ECU.
An unlikely, but possible cause could be a stuck FPR running you lean.
That happened on my turbo, and before I could replace it, the problem went away.
See if the values make a smooth sweep as you work the plunger or flap.
Any drops or bumps in the sweep of either sensor will freak the ECU.
An unlikely, but possible cause could be a stuck FPR running you lean.
That happened on my turbo, and before I could replace it, the problem went away.
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