turbodailydan

i have a fully built jdm ITR which is turbo'd running on ectune. and im having issues with the idle speed..

its been set to 1100rpm through the ectune, and sometimes it does idle at 1100rpm but very rarely.. alot of the time it sits at 2k - 2.5rpm and then drops to 1.5k rpm after a little while, but sometimes when i start the car it barely ticks over and idles at around 200rpm and usually cuts out..

ive replaced the idle control valve.. if i pull the plug on and off whilst the engine is running and the idle is around 200rpm, it makes the idle go back up to around 1.5k rpm. sometimes it behaves itself, sometimes goes back down to 200-500 rpm after a drive up the road..

im just wondering if it could be a dodgy TPS?

your thoughts apreciated - dan

96 GSR-T

is it tuned?

BoostedGSREJ1

Vacuum leak?

BoostedGSREJ1

Whats your tp voltage at?

turbodailydan

yes its tuned, the strange thing is it was idleing fine the first time it was mapped but the turbo failed (oil restrictor too small)

replaced the turbo with the exact same model, and since then its had this problem, and it was mapped with this new turbo aswell..

i have not checked the TPS yet..

ive checked for vac leaks etc

Shadowz7429

Here's how to adjust your tps fella:

LightningTeg

You dont need to do that with ectune. Just go up to tools and TPS calibration..

PyroProblem

Sticking throttle body or butterfly?

4drdohc

both my cars do that on ectune too? my turbo one just started doing it but it runs prefectly fine and everything? idk

0mtber

iTrader: (2)

Sounds like a tuning issue, not eCtune.
Take the car back to the tuner to have it fixed.

HiProfile

In my experience, ectune idles practically anything, and does it better than any other EMS. However if you have a vac leak or a an internal engine issue, it will go bonkers trying to hunt for that RPM.

One question I have is how you have base idle set. Meaning does it idle around 500-750rpm with the IACV unplugged? With a regular 750 rpm idle, it should be 400 rpm base, so the base idle should be about half the regulated idle.

turbodailydan

ok guys just want to update this problem..

so i took the car back to my mapper, we hooked up the laptop and went about adjusting the idle via the software, moving it up and down on the software the rev's were not responding..

so we took the
idle control valve off of an ITR that was sitting in the workshop that was known to work properly.. we fitted this and went to adjust on the laptop, the revs were now responding when adjsusting it via ectune, so i thought great its fixed...

drove 5 secs down the road and when i put the clutch down she cuts out... anyways i said id give it a try for a week and see how i get on..

a week later... so its been doing the same thing as before all week, most of the time it idles at 1500rpm to 2500rpm, after driving for a while it usually drops to around 1100 to 1500rpm but thats not always the case..

yesterday started it up from warm and it was idling at around 800rpm, i opened the hood and unplugged the idle control valve whilst the car was running, then plugged it back on and the idle shot back up to 1500rpm and stayed around that for the rest of the evening..

it really does have a mind of its own..


sometimes it doesnt seem like its working at all.. this morning i started it up and its idling at 800rpm..

turbodailydan

also just to point out, we checked the voltages at the idle control valve connector and compared it with the ITR in the workshop and they were the same, so we know the wire is good.

we even plugged the ectune into the ITR in the workshop to test the ectune was working correctly with the idle control which it was..

so far we have gathered that

the ectune is functioning correctly
the idle control valve works
the idle control valve wiring is good

we also check the TPS readings via the ectune and that appears to be opperating correctly too..

are there any other sensors that the idle control valve relie's on to operate correctly?

turbodailydan

ok just started her up from cold..

idle is around 800rpm almost stalling..

open the hood, unplugged the idle control then plugged it back again and idle went up to around 1500rpm..

turned engine off... restarted.. idle at 800rpm again.. unplugged idle control and re plugged, idle goes back to 1500rpm..

turned engine off, restarted.. and the same thing..

Hybrid96EK

When you unplug the IACV with the car running, you will generate a code for a bad IACV and your CEL will come on. The idle will increase to around the point you specified because the ECU essentially is ignoring the IACV. Your not solving anything or proving anything by unplugging it and plugging it back in. Sounds like you have a vac leak, TPS isn't callibrated or possibly a map sensor/timing issue.

turbodailydan

hmmm.. map sensor is brand new omni 4bar, TPS was functioning correctly according to my mapper.

ive check all the vac pipes aswell but no leaks that i can see... plus if there was a leak you would think the idle would be high all the time, but it does idle at 800rpm alot so that kinda makes a vac leak unlikely.

ashb82

i had the same issue it was a vacum leak. was hard to find also

Bailhatch

pressure test from the throttle body.

RedR

I had a similar issue with my itr....iacv valve pretty much died...it wouldnt hold idle on while cold.

Tony the Tiger

Just swap IACV's... That will completely rule out any mechanical faults.