| View previous topic :: View next topic |
| Author |
Message |
sleepy
Joined: 29 Nov 2004
Posts: 63
Location: UK
|
 Posted: Mon May 16, 2005 9:08 am Post subject: mixture |
 |
|
Got my new plug leads this week. After a bit of playing with the
accelerator while turning her over I eventually got her started.
Idling at not enough revs it sounds like its ready to cut out, but
sounding great at the higher revs. I didn't used to have to touch the
pedal to start it even tho idling was rough, but at the MOT (compulsary vehicle test in UK) a while ago the mixture was adjusted to get the Co2 reading closer to what its supposed to be.
Is it possible that because one of the old leads wasn't working, with the new leads the mixture will now be wrong ? I took the air
filter out & if i touch the (i think it's called?) air meter gently,
it idles normally.
Once it's been started it'll start again straight away.
-thanks.
_________________
meteor silver 1981 924 lux. -UK |
|
| Back to top |
|
 |
Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
|
| Posted: Tue May 17, 2005 5:06 pm Post subject: |
|
|
If your MoT man leaned off the mixture, it's probable that the idle speed will have dropped.
All you need to do to get it back is to tweak the throttle bypass screw on the side of the throttle housing (the one in the little tube that sticks out of the housing).
Changing plug leads shouldn't have any effect on the mixture.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
|
| Back to top |
|
|
sleepy
Joined: 29 Nov 2004
Posts: 63
Location: UK
|
| Posted: Tue May 17, 2005 5:22 pm Post subject: |
|
|
| Quote: | Changing plug leads shouldn't have any effect on the mixture.
|
my thinking was that if the mix was adjusted to compensate for a lack of spark, does it need to be adjusted now the spark is good?
_________________
meteor silver 1981 924 lux. -UK |
|
| Back to top |
|
|
Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
|
| Posted: Tue May 17, 2005 6:45 pm Post subject: |
|
|
Good point.
Lack of spark (or, more likely, intermittent spark) will certainly up the unburned hydrocarbon (HC) emissions. I can't quite see clearly what effect it would have on the CO level, but I suspect it might go [i]down[/i] with an iffy spark.
If the mixture was tweaked to lower the HC level with dodgy leads, you could be running dangerously lean, but I think it's unlikely. If your car pulls away strongly with a warm engine, the mixture's not too far on the lean side.
_________________
1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
