Hi everyone,
I have a 93 g40 py engine code but i've been having some running problems, it has lumpy idle and cuts out at junctions. In the past fortnight the below jobs have been done:
Super charger overhall at jabba sport
Heads been overhauled with new guides,valves,and a skim.
Genuine coolant sensors including the blue one!
All top end gaskets (genuine)
Plugs,leads.cap,rotar arm
New fuel tank
Cambelt water pump
The timing has also been done and I've triple checked it.
However after all of this it still runs lumpy and cuts out at junctions, its worse when its cold. When you restart after its cut out in the morning it turns over slow like the timing is really far out but its not.
Also when I connect vag com the live data says its 5860rpm when its idling (900rpm) I think its something to do with this but if anyone has any ideas it would greatly appreciated.
get a multimeter and check your co pot and the output of your alternator...
i'd say the alternator was probably on its way out, not supplying enough voltage or the battery is dying and therefore the car is running in limp home mode.
Thanks mate which wires on the co pot do i check do i adjust it 5.50 ohms?
gemma sorry i didnt get back to you earlier but i would of said the same as pete anyway. Hope you get it sorted. Mine just needs an MOT and tax which frustratingly I cant afford at the moment lol
lew
550 ohms ish
http://www.polog40.co.uk/forum/index.php/topic,214.0.html
Hi all,
Thanks to everyone for their help. I got Dean to type up this original post as I don't really know the technical side but he's read through everything and we're going to try a new alternator first and work from there.
We'll keep you updated!
Gemma
Hi again all,
Had some great news from Dean that after a new alternator and a clean up of all the earth wires (think that's what he said?!) that the G seems to be running well now. I am so chuffed and grateful for all the work he put into it.
It's gonna be a like a new car when I get it back!! Can't wait .....
Thank for everyone's help on here and Phil :) Gonna polish it all up this weekend and take pics hehe
Yes, it's amazing what difference a good alternator and clean earths make !
Maybe I spoke too soon. The G still isn't quite right. It's hunting a bit and has cut out a couple of times when driving and braking.
I'm going to drive it about this weekend and see how it goes but we might have to come back for some more advice!
Thanks all
Gemma
Hi all,
I've now done the run in miles (just over 400) on the G40 and it STILL won't idle and keeps cutting out.
I think it's a little bit worse when it's cold. Sometimes it's perfect and will sit there, othertime it will totally drop revs and die. Also when I pull away it can't seem to take me accelerating and can't pick the revs up, then again cuts out. Still cuts out when you come to a junction as it can't hold the revs.
Any more ideas?!!! It's such a shame as I've waited ages to get it back but I can't really drive it like this. Thanks for all your help everyone.
Gemma
Its nothing as simple as the idle screw on the throttle body is it? Thats given me terrible idleing etc in the past. Worth a try.
jimbugalee if you get this fixed can you let me know cos i have exactly the same problem!
Its as if there is a vacuum leak somewhere, but i can't find one! I've replaced the blue temp sender and lambda (although the lambda was from gsf) and nothing seems to help.
See above for some of the things I tried Danny. They did help but the latest is that it will idle fine when I turn it on from cold although it is hunting at bit and if I leave for 5 mins it might not hold and will stall.
If I drive it when it's cold I might as well not bother as it will permentantly stall (not my lack of driving skill!). When you pull up it can't hold it's revs .. just drops to idle and then drops off completely and stalls. Definitely worse when it's cold but still not right when it's warm.
I'm going to take it back into Dean and expect he'll come back on here for some advice as we're a bit stuck.
hmm it sounds like you have very similar problems to me, if you check my other post below
i swapped the blue temp sender today and it fired straight away
but then i fitted it, tried again and it still had starting issues, so this makes me think its a wiring fault to the blue temp sender, so im going to check that its working right no loose connection
you want to put a spare blue temp sender in some hot water, and then take that to the car and fit that and fire it up and see how it effects it
just an idea, what im gunna try! aswell as checking all the connections
Thanks DK. The car is back in with Dean now so I'll ask him to check this post today. He said he'd thought of a few things to try.
the two wires that go to the blue temp sensor had breaks in on mine cut off replaced new seals and crimps solved this issue now have this problem on the coil with the brown wire
A bit obvious gemma, but take a look at the ends of the white vacuum pipe that goes to the ECU from the brake servo pipe. Easily knocked of and sends the idle to b......y.
Thanks both. Tried/tested the above and no change.
I think Dean has sent the ECU off to be tested. Apart from that we haven't got any further :( We'll keep trying!
Been through the guide?
http://www.polog40.co.uk/forum/index.php/topic,214.0.html
Dean sent the ECU off and they fixed a couple of problems but it didn't help the idling.
He's now unplugged the lamda probe and it seems a bit better. I'm going to have it back to drive for a bit to see if it makes a difference .... if so I'll buy a new probe. Fingers crossed!
If you're still struggling and around Cheshrie we can do a full health check for £50 :)
Gemma , Yoofs about 10 mins from me just to give you an idea ;)
Thanks guys :) We've got the diagnostic computer/tool thing and have been plugging that in. I'll see how it runs with this probe off and go from there.
Hello everyone! I am new here (the forum that is!) and been having exactly the same problem with my g40! Mine has an m45 conversion and i had that same problem from the moment the Eaton went in! I later found out that the metal ring that goes to the end of the plastic pipe (last hose before the throttle, had slipped from its original position and had been stuck just before the sensor (the one that goes in with just a pin and is square looking don't really know what it does, guesting its an air flow meeter!) that was causing it to really give me a hard time when trying to start the car and did stall and die on every junction, since i got the ring out and clean the sensor with some alcohol everything got better! Now it only stalls only occasionally an only dies ones in a wile! Not totally cured but better anyways! The power came back that's for sure! I hope I have helped and would really like to know if you find out what is really wrong! (Sorry for my English as I am from Greece!)
PS: I did try to set the idle by the screw, before I find out about the ring and might have messed it up a bit, maybe the reason why it still stalls a little bit!
The G now runs ALOT better without the lambda probe which is great news :) I'll keep it for the rest of this week then we'll fit a new one next week and hopefully that's the end of the garage visits and £££££££