Rising Revs?

[senilykSkylines]

Just wondering if you guys had any ideas regarding a weird problem I have with my skyline.

When the car is warm and I stop to idle...the revs rise to about 2000 rpm and then hold there and then drops down to 1100 rpm. When it is cold it smoothly idles at 7-800 rpm? Just when it is warm it is high.

I took it to a mechanic and he said it could be any number of things but he thought it could be the computer thinking it is an auto (I did a manual conversion), but somehow I am not sure about that.

Anyone else had a problem like this switching from auto to manual?

Help!

[senilykSkylines]

Please anyone?

Any ideas as to the cause? Is it simply needing a tune after the conversion?

[Ericjayrol]

I used to get that same problem with my Ford Laser, did some tampering with the idle and when i lowered it it somehow fixed it, one of those things that doesn't make logical sense but works...

Ofcourse, that was a car that was manual out of the factory, so it could have been a completely different issue to what your experiencing, it sounds like your on the right track by assuming its a tuning issue due to the conversion.

[senilykSkylines]

I tried lowering the idle a ways back but it was already as far back as it would go from memory. I'll try again.

I don't think it is the tuning because the guy who installed the box made it so that the car thought it was in neutral all the time. If he did it in drive it would do it I would imagine. I'll just have to do some more tests and fiddling around.

cheers,

Dan

[tridentt150v]

You also have a fast idle for your A/C, maybe it is the culprit?

[senilykSkylines]

I found this - http://www.skylinesaustralia.com/forums/Di...;hl=rising+revs. I might try this out, because it sounds more like the problem. I have A/C off most of the time and the A/C doesn't work neway.

[West]

Good chance that your Coolant Temp sensor stuffed up, there is a name for it but i forgot what it call.

[central coast person]

Hey mate, i know the problem all too well next time you have the high rev, take the wire going into your Throttle postion switch out. Once you do this it confirms the s if the rev's drop, if so then you need a new throttle postion sensor. I forget how much they are but i can order them at nissan.

[senilykSkylines]

Hey mate, i know the problem all too well next time you have the high rev, take the wire going into your Throttle postion switch out. Once you do this it confirms the s if the rev's drop, if so then you need a new throttle postion sensor. I forget how much they are but i can order them at nissan.

Many thanks,

I'll check it out. My cousin mention the tps as well. I'll give it a go. Where is it in the engine? (sorry for my ignorance), I will have a look around to see if I can find it.

[central coast person]

if you stand at the front of your car you will see the throttle body has a small box attached to it (has a wire and a plug if its a series 1 or if its a series 1.5 it will have the S2 TPS but 1 of the plugs has no wires going into it and the S2 has 2 plugs both wired up). Shouldnt be able too miss it now