Setting CO pot ( another question regarding cutting out )

[JregGT]

Afternoon folks, I've done lots and lots of searching and have found out the relevant information for the CO pot of a decent base setting of 550ohms across pins 1-3 of the CO pot. But one question that I can't find anwser'd or I am being a real doughnut. But under what conditions do you alter/test the sensor. The impression I am getting is that you set it with the car off. So simply check the sensor solely without any other influences. But thought it was certainly worth putting a post up to check!!!

Cheers everyone Rich

[JregGT]

Not to worry, done off the car and set at 550 already.
But while setting base idle, I have found that unpluggind the blue temp sensor, does not lead to a slight rise in revs, but a slight decline. The car is running well, bar when approaching junctions islands etc, if you dip the clutch to change gear and don't change instantly the car trys to cut out, and sometimes does.
I was going to post this if setting the idle and checking the CO did not clear up the problem!
Is it possible that its a dirty ISV causing this? I'm not sure when the ISV is used by the engine.

Cheers folks

Rich

[cheys03]

Andy or another G40 management hero will be able to tell you for sure, but AFAIK between pins 1&3 it's just a potentiometer (3 is earth). So if you unplug the CO pot from the loom and adjust it to ~550ohms (or whatever value you want to start from), car on or off it doesn't make a difference.

[cheys03]

when approaching junctions islands etc, if you dip the clutch to change gear and don't change instantly the car trys to cut out, and sometimes does.

What value was your CO pot set to previously? If you richen the mixture by setting the CO pot to say 200-300ohms, does that improve things?

[JregGT]

I havent altered it, It was pretty much bang on 550 when i've just tested it, I was almost hoping for it to be out so it could of been a problem, but from what I gather 550 is a good setting!

[cheys03]

It's a base setting to get it going as far as I understand. To set it properly you need an accurate CO meter in the exhaust. What map is your car running on?
You may want to richen the CO pot to see if it helps - it's not necessarily a solution and may well be hiding the true problem, but I've a hunch it'll stop the car cutting out for the moment.

[JregGT]

Well I wont say too much till i test it properly, but i've just been out and altered it to 450ish and certainly on the drive the revs aren't dropping like they did previously, its revs, then just drops back to idle.
The car is running an old jabba map in theory to all the cars modifications of stage 4 charger, GT inlet, toothies air filter and G60 injectors.

[cheys03]

Cool. It's nice when cars co-operate eh? :-) How new/known is the lambda?

[JregGT]

Brand new from GSF, I wanted a bosch from Euro but couldn't get one. It has also just had a fresh set of NGK BP7evx plugs.  Will be nipping out after tea, so will report back. But touch wood, looks to have it improved. With this altered would it alter the unplugging the blue temp sensor test? (taken my dirty clothes of fnow, otherwise would of nipped back out again!)

[cheys03]

With this altered would it alter the unplugging the blue temp sensor test? (taken my dirty clothes of fnow, otherwise would of nipped back out again!)

Possible, I don't know for sure sorry mate Let us know how you get on

[PeteG40]

from what i gather, jabba never did chips for g60s?!  its not overfuelling due to a mismatched chip/injectors?

[Andy]

Worth checking the ignition timing too.

[grantvw]

mine is doing the same or it was until i took it to pieces

[JregGT]

Well i've just checked the Jabba recipts, and it doesn't say anything about a chip for G60 injectors, so Pete, you are more than likey right. But on the ECU it has a sticker saying along the lines of ' injector correction ' I can't for the life of me remember what it actually says. But it certainly angles towards the fact that it it had been mapped to the setup, and that what was I was told when I bought the conversion.
I would like to get the map 'checked' if possible, without forking out for a full map, but i'll have to see. Last thing I want to do, is poop my engine after the work I put in doing it!
As far as the timing goes, I didn't even consider it, as the car runs brilliantly bar the described problems. It pulls very cleanly, no hesitations or obvious flat spots.
Took it to put it away for the evening and ran alot better revs still drop and the odd time it tries to cut out, but nothing like it was doing before!

[cheys03]

Is the sticker on the outside of the ECU? Does the map chip have a sticker which sheds any more light?