Club G40 Forum

Technical => Engine and Transmission => Topic started by: cheddarcheese on July 07, 2009, 03:38:41 pm

Title: G40 stalling/idle problem.
Post by: cheddarcheese on July 07, 2009, 03:38:41 pm

i can get my G to idle  and if i accelerate threw the rev range its fine but i let it go to idle or i let my foot of the accelerator the revs drop way below 500rpm and stalls even if i hold the revs at around 1500rpm and let of the accelerator it still tries to stall and stalls. the only way i can get it to idle is if i bring the revs down slow.

They engine has been sat in a unit for a year or so before i installing it and has a brand new alternator.

any ideas

cheers

Title: Re: G40 stalling/idle problem.
Post by: vwmk3jon on July 07, 2009, 04:31:11 pm

Almost what mines doing now! Pain in the f****** arse!

Interested to see what people say on this.

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 07, 2009, 07:09:32 pm

I just cleaned the idle control valve. no different.
Changed coil. no different.

Title: Re: G40 stalling/idle problem.
Post by: hayesey on July 07, 2009, 07:14:26 pm

what's the spec of the engine?

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 07, 2009, 07:21:10 pm

ECU with fitted PSD chip
G40 charger full blend
68mm pulley
G40 manifold Decat and Strait threw exhaust
Dewedged throttle body
boost return removed

Title: Re: G40 stalling/idle problem.
Post by: hayesey on July 07, 2009, 07:32:40 pm

when it does idle, what rpm does it idle at?

might also be worth making sure that the holes in the throttle plate aren't leaking.

Title: Re: G40 stalling/idle problem.
Post by: vwmk3jon on July 07, 2009, 07:37:14 pm

What would you suggest hayesey if i was running a standard t/b?

Title: Re: G40 stalling/idle problem.
Post by: GAF2 on July 07, 2009, 07:40:12 pm

mines exactly the same got a second hand isv but dont know if i will bother now if it never worked for you, when it does idle hayesey it sits about 1000rpm.  Could you explain a bit more about this throttle plate.

cheers guys

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 07, 2009, 07:43:27 pm

when it idles its about 1000rpm. i have no idea what to look at when it comes to to the throttle body as it was apparently a Dewedged throttle body when i brought the engine.

any pictures links?

i do have the opportunity to pinch some parts from my m8's none running G due to Charger oil seals gone just to see if any parts are fecked.

Title: Re: G40 stalling/idle problem.
Post by: hayesey on July 07, 2009, 08:30:33 pm

jon - your problem could just be down to needing remapping.  Hard to say really, could do with knowing what the fuelling is like when it happens.  I had similar issues with mine when it was too lean at idle.

this is a picture of a throttle body:

(http://derby.polog40.co.uk/ntlworld/paul.hayes73/100_1888.jpg)

those screws on the throttle plate hold the wedges on, when you remove the wedges these holes need sealing up or it wont idle properly. 

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 07, 2009, 08:34:55 pm

by looking at that i think mine is a standard throttle body .

Title: Re: G40 stalling/idle problem.
Post by: hayesey on July 07, 2009, 08:36:45 pm

so does it still have the wedges on the throttle plate or is the plate just flat?

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 07, 2009, 08:44:09 pm

it still has the wedges.

Title: Re: G40 stalling/idle problem.
Post by: vwmk3jon on July 07, 2009, 09:16:18 pm

yeah, i should think the lack of BVH & aquamist doesnt help when the chips suited to it.

Title: Re: G40 stalling/idle problem.
Post by: polo classic on July 08, 2009, 09:46:58 am

Yeah that will make the engine run lean down low

Title: Re: G40 stalling/idle problem.
Post by: vwmk3jon on July 08, 2009, 02:58:10 pm

Trying to pull away is dodgy to say the least! Its almost like its got a fuel defiency and then suddenly wham, the power picks up. Need them wiping off the chip really.

Title: Re: G40 stalling/idle problem.
Post by: Nick_S on July 08, 2009, 03:17:47 pm

Deffo the map on the chip.

Title: Re: G40 stalling/idle problem.
Post by: PeteG40 on July 08, 2009, 03:53:45 pm

tbh, you'll get a bit of that with the eaton as its all top end power

Title: Re: G40 stalling/idle problem.
Post by: vwmk3jon on July 08, 2009, 05:27:05 pm

surely not as bad as mine though? Its like my 1st ever car, the carb would get shit in it and cause me to be stuck at 5mph. thats what it feels like! sometimes i can drive through it, sometimes it stalls.

Title: Re: G40 stalling/idle problem.
Post by: hayesey on July 08, 2009, 07:16:23 pm

sounds like it's running lean at the bottom end.

Title: Re: G40 stalling/idle problem.
Post by: PeteG40 on July 08, 2009, 07:30:38 pm

1341 g40 eaton i drove was like a gt/stock g40 pulling away, then you got to 4k and it went like stink, only to change and be the same... mind you car was a bag of spanners

Title: Re: G40 stalling/idle problem.
Post by: hayesey on July 08, 2009, 08:09:53 pm

yeah I wouldn't judge it by that one you had pete, I dread to think what the fuelling on that was like.  Seeing as how the "remap" on it seemed to consist of an adjustable fuel pressure reg.

Title: Re: G40 stalling/idle problem.
Post by: PeteG40 on July 08, 2009, 08:13:34 pm

L O L

Title: Re: G40 stalling/idle problem.
Post by: hayesey on July 08, 2009, 08:29:43 pm

I would say "aint so bad".......but it was.

Title: Re: G40 stalling/idle problem.
Post by: vwmk3jon on July 08, 2009, 08:31:47 pm

This pulls away like a stock cube! 5/6mph max!

Title: Re: G40 stalling/idle problem.
Post by: Andy on July 09, 2009, 08:10:54 am

Hayesey's car was deffo in need of mapping - yours may be the same. I'd only commit to spending money on a remap once you're 100% sure that everything else is in good health though.

Title: Re: G40 stalling/idle problem.
Post by: vwmk3jon on July 09, 2009, 12:19:54 pm

im gonna get the coil changed along with the pulley to a vernier but ive gotta get it working first so i can get the bottom end checked to make sure its not fubared! injectors, plugs, gaskets, sensors are all new.

Title: Re: G40 stalling/idle problem.
Post by: Andy on July 09, 2009, 02:24:17 pm

A compression tester should only cost £20-£30, that'll tell you a lot about the bottom end. Did you sort the suspected alternator problem?

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 09, 2009, 04:27:22 pm

back on topic hijackers :) and what's my problem or and possible courses? ???

Title: Re: G40 stalling/idle problem.
Post by: vwmk3jon on July 10, 2009, 09:04:56 am

mine used to be the same. i cleaned the ISV out and checked the CO pot. we adjusted the screw on the t/b too and it ran better.

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 11, 2009, 12:16:59 pm

I have still not got my G running properly things iv done

changed ecu
changed blue temp
changed spark plugs
changed relays
changed ecu breather pipe

i don't know what to do help?

Title: Re: G40 stalling/idle problem.
Post by: Dan on July 11, 2009, 12:18:51 pm

Have you gone through this:

http://www.polog40.co.uk/forum/index.php/topic,214.0.html

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 11, 2009, 04:28:09 pm

checked the co-pot all set ok

after swooping bits and bobs cleaning the throtlebody the G is now got a jumpy idle what can course this?

Title: Re: G40 stalling/idle problem.
Post by: PeteG40 on July 11, 2009, 04:31:17 pm

timing? poor alternator output poor

Title: Re: G40 stalling/idle problem.
Post by: cheddarcheese on July 11, 2009, 04:35:06 pm

alternator output fine.

cant be the timing was running correct in old shell.

?

Title: Re: G40 stalling/idle problem.
Post by: jimbugalee on July 30, 2009, 09:08:17 am

Little bit late but my G40 has exactly the same problem it's super annoying.

Mine is completely standard and all I've done is replace fuel tank (needed doing anyway).

Anyone got any closer to fixing problem?