ogrotary

i purchased an 87 rx7 for my kid . the person that owned it before me had played w the wiring of the car as he was attemting to add an aftermarket alarm. all the wiring issues have been addressed and i was able to start the car. the problem is once running,it can idle for 10 minutes w no problems and then all of a sudden it starts to smoke and wotn rev. i try to rev it up to make it clean out but it sputters ,backfires,, n smokes as if too much fuel.if i drive it,it will run great then as i am driving it the same thing happens and it doent go away til i continue to clean it out,but it happens also at cruising speeds..once cleaned out the car runs amazing...any thoughts?

CrimsonPride

iTrader: (11)

If you suspect a problem of too much fuel you can listen for proper operating sounds from the primary injectors with an inexpensive automotive stethoscope. If you have a stopwatch and a fuel pressure gauge you can do a crude injector balance test with the ground wire for each injector at the ECU. You look at the fuel pressure drop by grounding each injector for 1/2 or 1 second or so. Compare readings for the 2 injectors. They should be roughly the same.

ogrotary

thanks for the info ...i will try that n see if it resolves the problem...

satch

iTrader: (1)

Make sure the TPS is set properly. All you need to do is take a voltage reading on the Green/Red wire at the TPS plug after the car has been driven for 20 minutes or so and w/key to the voltage reading on the wire ougt to measure one volt. If it isn't then turn the screw surrounded by a spring which is located on the front of the throttle body that is part of the throttle linkage til it reads one volt.

ogrotary

Ausome.thanks

satch

iTrader: (1)

Meant to say to take the voltage reading "with key to on" instead of "w/key."