Idle issues

[2.5mx3]

Hey guys-

Okay, so I bought another ZE throttle body to try out on my engine, but I'm trying to figure out what is wrong with my current one. I had some major problems with my idle a couple months ago, but a TPS reset cleared a lot of it up.

However, my idle is still high - beween 1000 and 1200rpms. This is the strange part though: I have the idle air screw all the way in. I mean, I can't lower the idle ANY more. It took me by surprise because I thought the engine would just stall if the screw was turned all the way in.

Anyway, I have yet to take out the IAC valve and clean it, but I suspect that will help some. And of course I still have this extra TB to play with.

Anyone have an idea why my idle is still way too high even with the idle air screw like this?

Thanks.

[Mnemonic]

what ecu are you using?

[2.5mx3]

Currently, the 1.8 ECU.

[killerpickle]

and your vaf?

[2.5mx3]

I've got a VAF from a Ford Probe GT. This seems to be the best combination, other than the ZE ECU and MAF.

[killerpickle]

i havent tried that combination. Have you tried the 2.5 (aspec) ecu and 2.5 vaf?

[timpronk]

well I would check your throttle linkage, make sure its not to tight (which would cause the valve in the throttle body to be open a litte.)

If thats ok then there is a little screw with a nut on it that stops the throttle in the idle position (loosen the nut and turn the screw in a couple of turns so the actual thottle linkage will relax a bit.) This is located on the throttle body (this is not the same as the idle adjustment screw you already adjusted)

And the 2.5 ecu with 2.5 vaf never ran good for me.

The 2.5 ecu with 1.8 vaf (low end no top end)
the 1.8 ecu with 2.5 vaf (best other than ze setup)

[curve]

Im having the same troubles but mines idles from 1800 to 2100 rpms

[tonguefreek]

i have the exact same prob but my car is all stock except for a cai ive tried everything with no luck so far the car ran great befor i put on the cai and now it idles about 1000 to 1200 i had the mazda dealer look at it and they said its cause the new intake lets in to much air.i have no vac leaks tps and idle are set by the book to.

[Zoso124]

Originally posted by 2.5mx3:
[QB]
Anyone have an idea why my idle is still way too high even with the idle air screw like this?QB]

Hank, have you tried bringing out the small screw that holds the throttle plate open a turn or so? This should be able to bring it down then use the IAC screw on top for fine adjustment. If this does nothing double check your TPS setting again.

[Guest]

guys I got the same prob...I put in my ze and ze ecu...2 weeks ago all good for like a day now i my idel is from 1500-2000 and i am runnin veryyy rich sounds like a muscle car what can this be?

[Guest]

oh yeah and i just failed my emmisions...........by far..........they said the car is just pumping too much gas.....I played with that little idle screw and with the timing.....i may have screwed something up there but anyways.........how can i solve this ..my car is on temporary plates since i cant re-register it without emissions

[Zoso124]

Play with the TPS.

[Guest]

ok...hmmm whats tps and how do I play with it?

[Dali]

hey magicfcb good to see you have money for your car, why dont you send my money back or ship the gauges i bought off you five months ago, also there is another member machambers looking for a k8 ecu he bought off you. i will be expecting a email from you. unclesluggo@shaw.ca