Idle problems are here again.

[pdtaylor18]

I think Dave\'s piece was more geared towards my problem but in a way just another piece of the jigsaw in everything concerned with the idle.
Hope the TPS check goes ok, its fairly easy and defo worth doing before anything else.

[BenLewisMav]

This table might give a clue - it\'s the input to output table - what sensors affect what outputs Neutral and Clutch seem to affect quite a few
 
I know when you start the car out of neutral (foot on clutch ) it will disable the AWS/ASV solenoids (they are wired in parallel, so it\'s really only 1 output) which is the circuit that revs the nuts off the car when you first start it to warm up the cat (which most of us don\'t have anymore).
 
I\'ve noticed the rev change when I select first as well, so I am guessing this is the neutral switch or clutch switch - and may be some kind of preload launch thing built into the ECU.
 
The PRC solenoid is tied to the IAT sensor and provides higher fuel pressure on a warm start - that might effect rev\'s in that way - may test this by unplugging the solenoid  - but that should only operate on starting - it\'s defeated after about 60s as is the AWS/ASV rev up code.
 
I know the relief/split and port solenoids are tied into the revs and clutch/reverse/5th switch, but I no longer have these and still have the rev increase on selecting 1st gear.
 
Defo needs further investigation...

Here\'s one thats going to mess with you-
I\'ve removed all of the solenoids and emissions stuff and the original engine loom and ecu (gone Microtech) and pressing the clutch pedal down STILL effects idle... lol

And TPS is causing me idle probs too at the moment, as it relies on the voltage from the battery to tell the ecu what the throttle position is (and the voltage seems to keep changing every time I run it) I spend most times adjusting the TPS reading.

[Prof]

One thing I\'ve noticed is that when the oil level is lower on the dip stick the idle seems to hunt more.  Topping up the oil so that you are between 2/3rd\'s and Full seems to help with the idle - no idea why?
 
Does anyone know how often the TPS goes out of adjustment ?

[DRIFTMOTION]

Hi Adrian,

I fitted my Blitz ecu on mine no idle probs at all... Then developed a fault with my omp and blew a power trans in my Blitz ecu:mad: Since changed the omp and ecu to a RE Amemiya and that is idling low sometimes stalling. Have\'nt had the chance to have a look at it, but I suspect tps. You will have to rig up a test light to do though mate.

[TiddlesRX7]

Well some good news finally. I got round to removing the TPS off my donner car at the weekend. So decided to fit it on monday night. I took the intercooler off only to realize that I had left my 1/4 drive socket set at work, and couldn\'t remove the TPS cause you can\'t get a spanner in. Gutted. The UIM around the TPS was generally covered in oxidisation and muck so moved it by hand a few times to make sure it was all free. I replaced the intercooler and fired up the engine to make sure I had no leaky pipes. Only to be greeted with a lovely purr from the engine at about 1200 rpm. HHHMMMM I thought reaching for the BAC valve screw. Sure enough after a couple of turns she was purring like a kitten at 750 rpm and not hunting in the slightest . Shes been running like that for a couple of days now so I am hoping that is the end of it.
Except she doesn\'t do the 3000 rpm cold start thing its more like 2000rpm then dropping to 1500 rpm but I can live with that.

[pdtaylor18]

maybe then a sticky TPS? or maybe a leak from the intercooler and you just never spotted it?  Main thing is that it works. My idle is fine now as well but still hunts a bit until its warm. Not got round to adjusting/checking the TPS but that cured it last time.