Tofuball

My car has started randomly misfiring at all RPMs. It used to only do it above 3K

It is less noticable when I am actually DRIVING the car, but still there

If I hold the throttle any distance open in nutral, staying at any given RPM, it goes like;

PurrrrrrrrrrrrrWMPrrrrrrrWMPrrrrrWMPrrWMPWMPrrrrrr WMPrrrr..... (and so on)

So, I cleaned out my TB and MAF with electronic parts cleaner and it changed nothing at all.

This happens at ALL RPMs, even IDLE.

It's not really violent, it's just . . . there.

Any ideas what I should check?

WAYNE88N/A

TPS
worn plugs/wires
faulty ground (rear rotor housing, or coil assemblies-to-chassis)
engine dying (compression)
CAS dying
one of many sensors' inputs to the ECU intermittent
fuel filter(s) clogged
injector/injector connector faulty
the list could go on and on...

Try this if you would like to see what your sensors are doing at the ECU...

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/troubleshooting-your-car-ecu-340578/

RETed

It's actually normal at idle.


-Ted

Husemoller

delete this sorry

Tofuball

Awesome! Thank you very much. Guess I have a lot to check.
What I do know is:

Plugs/Wires are good
Ground is fantastic
Compression is good
Fuel Filter is brand new

So I'll check everything else on that list.

thanks again!

Tofuball

It wasnt for me, before it started doing this, at least O_O

DerangedHermit

See, this is why my car isn't fixed. I just don't have the time or money to check ALL this stuff. Oh well, slow and steady...

SureShot

Check out this video & see it's similar to your problem.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/worn-out-tps-video-example-340196/