hey just purchased a 93 wit 39k on it.car seems great but idles is alil jumpy.can it be a coil problem?

 

Check for vacuum leaks.

Test compression.

Clean BAC/IAC.

 

you can also check for spark on all four plugs to make sure its not a coil problem. check fuel pressure if the other suggestions dont work. check the voltage on your tps and compare to spec. stuck injector maybe? use a quick probe. check the fsm for a diagnostic list. coolant temp sensor was one of my problems.

 

Check that BAC connector. I had same problem when that BAC isn't working at all, and more obvious when I turn on my AC rpm will drop till it die.

 

This is a good list.

I would also change spark plugs (FDs eat plugs pretty fast) and check the ECU for codes.

Then look up the code in the FSM. In the back of section F you'll find a symptom/fault chart to show if any codes you find are known for causing idle problems.

If you get through all that and still nothing wrong, adjust your idle and adjust your TPS.

Dave

 

I had the same problem, turned out to be the IAT sensor
do you have a PFC? they are a God send to these sort of problems

Best of luck

 

X2 my FC had an idle surge when I first bought it.

 

got it coil prob good stuff fellas

wow v6mike what kinda rims you got on that beast?

 

thanks fella they are 'RAYS MAZDASPEED 17 split rims' with colour coded centers

glad your problem is sorted dude