View Full Version : idle is stumbling searched but non of there problems are mine

S-Nation S13
02-19-2008, 07:43 AM
ive searched for a day and a half all i found was
IACV not grounded
pressing the brakes will cause low or stumbling idle
vac lines near throttle body
spray intake cleaner in tude near intake which leads to IACV
cold engine will reach 1000 rpms the drop 450-500 rpms rough ass idle
cold start = rough idle and stay throughout the trip
stumbling problems SR=boost leak

i found one about cts but the just brushed on it "they swapped out" and problem gone but no one really explained what was happening they just said "swapped cts" and now no problem i need clarification?

my problem

i start my car 1000-1050rpms normal as soon as car settles down stumbling idle will go from 700-750-700-650-750 like that for about 3-5 min. as soon as car reaches op. temp my car is constant 750-800/850 no stumbling steady cts is the only thing i can think of cause while i did the search^^^^i fixed all those but i still had the idle problem is it my cts?

02-19-2008, 09:57 AM
So you did all those things in that list?

Cleaned the IACV?
Cleaned the MAF with MAF cleaner? (don't use brake/carb cleaner or anything like that)
Absolutely no vac leaks?

The car idles and drives fine once it gets to operating temperature, after ~5 minutes or so? If so, honestly...I probably wouldn't worry about it much. My SR* runs and idles funny for the first ~5 minutes, especially if it's cold out, but runs great once it's all warmed up.

*which reminds me, what engine are we talking about here?

Slow Poke
02-19-2008, 10:01 AM
It's going to be either a IACV problem or a vacuum leak. Have you ever removed the TB and if so did you replace the gasket?

S-Nation S13
02-19-2008, 10:29 AM
we are talking bout KA24de sorry for not specifing yup i personally changed all vac lines my self but havent check TB gasket will look into that IACV was swapped with a known working one with no problems and yes i did replace IACV gasket with new one maf came off known working unit TpS...used a a labscope to see if potiencimeter <<i spelled it wrong had any cuts was good clean sweep...from closed to WOT

but could CTS cause cold operation to have eratic idle then when engines warms up to op. temp run normal?

02-19-2008, 11:04 AM
Having a bad CTS will diffenantly cause weird problems to occur, just replace it.

02-19-2008, 11:21 AM
have you checked the resistance in the cts when its cold or when it reaches normal op. temp. ?? i got a similar problem with my kade still havent fixed it ='[ gl=]

S-Nation S13
02-19-2008, 04:39 PM
resistence on cts..havent look ill check fsm to see how to get that reading back to the drawing board

02-20-2008, 07:57 AM
it's 17 dollar part....by the time you check it...you could've replaced it.. hehe

Dave =P