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3k rpm idle

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Old 04-04-09, 11:59 PM
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Originally Posted by spoolage
I doubt this is your problem but when I stripped down my old block and transferred all my parts to a new engine - the primary injectors were not seated properly and caused a severe vac leak resulting in my idle sitting at 3k rpms regardless of what I did.

When you installed the FMIC, did you touch anything on the block?
nope the injectors are fine
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Old 04-05-09, 04:17 PM
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still need help.......
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Old 04-05-09, 04:36 PM
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Did you push the throttle linkage on the rear of the throttle body away from the fast idle cam to make sure it had not been sitting on the cam? If you did that, did the idle drop down, or not?
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Old 04-05-09, 08:06 PM
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Originally Posted by x mazda rx7 x
still need help.......

Did you try what I said a couple post back?
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Old 04-05-09, 10:37 PM
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Originally Posted by wstrohm
Did you push the throttle linkage on the rear of the throttle body away from the fast idle cam to make sure it had not been sitting on the cam? If you did that, did the idle drop down, or not?
i tried that and nothing happened
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Old 04-05-09, 10:38 PM
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Originally Posted by RotaryBuddha
Did you try what I said a couple post back?
i'm not exactly sure where the isc is.
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Old 04-05-09, 11:17 PM
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i'm not exactly sure where the isc is.
Actually Mazda calls it (in the 1994 FWM) an Idle Air Control (IAC) valve. It is one of two ECU-controlled intake air valves mounted on the underside of the UIM. The IAC valve is the one closer to the driver's side of the engine compartment. The electrical resistance between its two terminals should be 10.7 - 12.3 ohms. And its actuating rod should move smoothly. With no current through its coil, the valve should be closed by an internal spring.
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Old 04-05-09, 11:40 PM
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so im gunna have to take off the uim to get to it right?
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Old 04-06-09, 12:00 AM
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Right.
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Old 04-06-09, 05:53 AM
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Originally Posted by x mazda rx7 x
so im gunna have to take off the uim to get to it right?
I was able to reach the plug without removing the UIM. And was able to remove the whole ISC it self without removing the UIM. Its a bitch but it can be done. Unplug it and see if it helps.


Page F-81 from 93 FSM





Page F-83 from 93 FSM

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Old 04-06-09, 09:00 AM
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Have you tried spraying carb/brake cleaner in the engine bay to see where you might have a leak? The idle will start to drop if you find the culprit.
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Old 04-06-09, 12:01 PM
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Originally Posted by GoodfellaFD3S
Have you tried spraying carb/brake cleaner in the engine bay to see where you might have a leak? The idle will start to drop if you find the culprit.
that completely skipped my mind i'll go pick some up today
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Old 04-06-09, 12:03 PM
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also, where can you pick-up the fsm. do you have to order it from mazda?
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Old 04-06-09, 12:23 PM
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Originally Posted by x mazda rx7 x
also, where can you pick-up the fsm. do you have to order it from mazda?
In one of the "sticky" threads at the top of this section of the forum:

https://www.rx7club.com/3rd-gen-archives-73/tech-manual-directory-614824/
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Old 04-06-09, 12:24 PM
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oh. nice
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Old 04-06-09, 07:08 PM
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So Mazda called that valve an Idle Speed Control (ISC) valve in 1993, but called it an Idle Air Control (IAC) valve in 1994... They did the same thing with the Miata; changed nomenclature from ISC to IAC in 1994. In the case of the Miata though, that unit actually changed quite a bit.
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Old 04-06-09, 07:43 PM
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i sprayed the brake cleaner. no idle drops though. kind of glad its not that
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Old 04-07-09, 02:13 PM
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i think rotarybuddha was right!!!!
my isc is making 13.8 ohms and for a few seconds it jumped up to 19 ohms! should i go ahead and replace it?
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Old 04-07-09, 02:55 PM
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Originally Posted by x mazda rx7 x
i think rotarybuddha was right!!!!
my isc is making 13.8 ohms and for a few seconds it jumped up to 19 ohms! should i go ahead and replace it?
Well that means its out of spec, so you could just leave the thing unplugged and retune your PFC for manual idle control. Or it would be easier to just replace the ISC. Their are probably a couple in the for sale section from people removing them. I would sell you mine buts it was broken like yours.
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Old 04-07-09, 02:57 PM
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Originally Posted by RotaryBuddha
Well that means its out of spec, so you could just leave the thing unplugged and retune your PFC for manual idle control. Or it would be easier to just replace the ISC. Their are probably a couple in the for sale section from people removing them. I would sell you mine buts it was broken like yours.
i think i'll just replace it but for now just leave it unplugged
i just went back to test it again and now it only makes 9.4 ohms
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Old 04-07-09, 03:03 PM
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IAC valve unplugged = closed. ISC valve unplugged... don't know. Is your warm idle still around 2K rpm?
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Old 04-07-09, 03:19 PM
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not sure. ill go check
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Old 04-07-09, 03:44 PM
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ISC valve unplugged = closed

I did this on my car about 2 months back.
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Old 04-07-09, 03:52 PM
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do you think i could use duct tape to cap off my aws pipe?
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Old 04-07-09, 04:08 PM
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Originally Posted by x mazda rx7 x
do you think i could use duct tape to cap off my aws pipe?


The caps are like $1 to $2 at any parts store.
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