badly fluctuating idle ? need help!!
18 October 2004, 08:30 PM
#1
Scooby Regular
Thread Starter
Join Date: Sep 2001
Location: london
Posts: 819
Likes: 0
Received 0 Likes
on
0 Posts
badly fluctuating idle ? need help!!
just got my uk99 with ppp, fitted with ;
3" roger clarke downpipe[no cat and heat wrapped ]
3" revolution centre section and backbox.
headers and up pipe ported and heat wrapped[done by harvey]
knocklink and lambda link.
and got my engine cleaned as well.
all fitted by gossy ,who has been very helpfull and flexible both with price and service.cleaned the car before he gave it back as well-nice touch,thanks gossy.
but on the drive home i noticed the revs at idle [at traffic lights etc. ] fluctuated badly up and down,sometimes nearly conking out!
what could the cause be?
maf?
ecu?
do i need a better air filter?
goes without saying didnt have any probs before the above mods.
HELP!! will i damage the engine driving like this?
3" roger clarke downpipe[no cat and heat wrapped ]
3" revolution centre section and backbox.
headers and up pipe ported and heat wrapped[done by harvey]
knocklink and lambda link.
and got my engine cleaned as well.
all fitted by gossy ,who has been very helpfull and flexible both with price and service.cleaned the car before he gave it back as well-nice touch,thanks gossy.
but on the drive home i noticed the revs at idle [at traffic lights etc. ] fluctuated badly up and down,sometimes nearly conking out!
what could the cause be?
maf?
ecu?
do i need a better air filter?
goes without saying didnt have any probs before the above mods.
HELP!! will i damage the engine driving like this?
18 October 2004, 09:00 PM
#2
Scooby Regular
sounds like MAF failing
did the ECU get unplugged or the battery disconnected for an amount of time
Chances are your MAF was failing anyway, but the ECU had 'learnt' to cope , until it got reset
Happened to a mate, after I fitted his gauges, and we had the ECU disconnected
New MAF sorted it out, you could try leaving the engine idling, and disconnecting the MAF, IIRC the engine should then stall if the MAF is ok
edited to add, get it changed ASAP
did the ECU get unplugged or the battery disconnected for an amount of time
Chances are your MAF was failing anyway, but the ECU had 'learnt' to cope , until it got reset
Happened to a mate, after I fitted his gauges, and we had the ECU disconnected
New MAF sorted it out, you could try leaving the engine idling, and disconnecting the MAF, IIRC the engine should then stall if the MAF is ok
edited to add, get it changed ASAP
18 October 2004, 09:10 PM
#3
Scooby Regular
Thread Starter
Join Date: Sep 2001
Location: london
Posts: 819
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by *Sonic*
sounds like MAF failing
did the ECU get unplugged or the battery disconnected for an amount of time
Chances are your MAF was failing anyway, but the ECU had 'learnt' to cope , until it got reset
Happened to a mate, after I fitted his gauges, and we had the ECU disconnected
New MAF sorted it out, you could try leaving the engine idling, and disconnecting the MAF, IIRC the engine should then stall if the MAF is ok
edited to add, get it changed ASAP
did the ECU get unplugged or the battery disconnected for an amount of time
Chances are your MAF was failing anyway, but the ECU had 'learnt' to cope , until it got reset
Happened to a mate, after I fitted his gauges, and we had the ECU disconnected
New MAF sorted it out, you could try leaving the engine idling, and disconnecting the MAF, IIRC the engine should then stall if the MAF is ok
edited to add, get it changed ASAP
how much are those buggers then?
is it easy to fit?
cheers mate
Last edited by yhe chod; 18 October 2004 at 09:12 PM.
18 October 2004, 09:45 PM
#5
Scooby Regular
Thread Starter
Join Date: Sep 2001
Location: london
Posts: 819
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by TDT
If you take it to Subaru they'll probably try and stiff you for about £320 (housing et al). But the sensor can be bought on it's own for about £72
£72, cheers but are we sure its the maf.
ill have to try and disconnect it as 2nd post suggested
18 October 2004, 10:31 PM
#6
Scooby Regular
iTrader: (2)
Join Date: Oct 2003
Location: In the summerhouse
Posts: 661
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by yhe chod
£72, cheers but are we sure its the maf.
ill have to try and disconnect it as 2nd post suggested
ill have to try and disconnect it as 2nd post suggested
Replaced it and all was back to normal - so you cannot be sure just by the disconnection method.
Bear in mind however, £72 is much less than a new engine if the MAF is dead/dying.
18 October 2004, 11:19 PM
#7
Scooby Regular
Join Date: Dec 2003
Location: Saaf Oxhey
Posts: 378
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by yhe chod
just got my uk99 with ppp, fitted with ;
3" roger clarke downpipe[no cat and heat wrapped ]
3" revolution centre section and backbox.
headers and up pipe ported and heat wrapped[done by harvey]
knocklink and lambda link.
and got my engine cleaned as well.
all fitted by gossy ,who has been very helpfull and flexible both with price and service.cleaned the car before he gave it back as well-nice touch,thanks gossy.
but on the drive home i noticed the revs at idle [at traffic lights etc. ] fluctuated badly up and down,sometimes nearly conking out!
what could the cause be?
maf?
ecu?
do i need a better air filter?
goes without saying didnt have any probs before the above mods.
HELP!! will i damage the engine driving like this?
3" roger clarke downpipe[no cat and heat wrapped ]
3" revolution centre section and backbox.
headers and up pipe ported and heat wrapped[done by harvey]
knocklink and lambda link.
and got my engine cleaned as well.
all fitted by gossy ,who has been very helpfull and flexible both with price and service.cleaned the car before he gave it back as well-nice touch,thanks gossy.
but on the drive home i noticed the revs at idle [at traffic lights etc. ] fluctuated badly up and down,sometimes nearly conking out!
what could the cause be?
maf?
ecu?
do i need a better air filter?
goes without saying didnt have any probs before the above mods.
HELP!! will i damage the engine driving like this?
MAF MAF MAF MAF MAF MAF MAF.......I promise you...get it changed, asap, voice of experience.......If you in the Wycombe area I got one you can try.
Trending Topics
19 October 2004, 11:30 AM
#11
Scooby Regular
Join Date: Mar 2003
Posts: 55
Likes: 0
Received 0 Likes
on
0 Posts
After I bought Scoobymoos PPP ecu for my MY99 (Thanks again - It's improved the car no end) Mine done exactly the same. New MAF sorted it - I still have the recipt in the car: Part No 22794AA010 £77.19
19 October 2004, 08:14 PM
#12
Scooby Regular
Thread Starter
Join Date: Sep 2001
Location: london
Posts: 819
Likes: 0
Received 0 Likes
on
0 Posts
thanks lads will check ecu codes and then reset it and take it from there.
must emphasise it only fluctuates from 1000 rpm [around normal idle revs] to 0 revs.[not all the way up to 2000revs or anything.]
could it runing weak on tickover how do i increase the tick over and richen the mixture?
the funny thing is i have a lambdalink but can anyone tell me how to interpret the lights? [it was flicking 2 reds at 70-80mph]
must emphasise it only fluctuates from 1000 rpm [around normal idle revs] to 0 revs.[not all the way up to 2000revs or anything.]
could it runing weak on tickover how do i increase the tick over and richen the mixture?
the funny thing is i have a lambdalink but can anyone tell me how to interpret the lights? [it was flicking 2 reds at 70-80mph]
19 October 2004, 08:29 PM
#13
Scooby Senior
If it fluctuates downwards from normal idle speed i would deffo say your maf is stuffed.
Even if it ain't - you would be well advised to replace it anyway. It's not really a case of "if" it will go, it's more the case "when" - A simple fact of MY99 life
Even if it ain't - you would be well advised to replace it anyway. It's not really a case of "if" it will go, it's more the case "when" - A simple fact of MY99 life
19 October 2004, 10:04 PM
#14
Fault codes won't necessarily show a failing maf. Will show if the maf is knackered, but may not show if it's on it's way out. As already suggested, change to be on the safe side. Also, if you're still on the original maf, a change will be worthwhile as the replacements are said to be slightly more restistant to failure, so an upgrade, if you like.
If you're still not convinced then take : eek: up on his offer.
If you're still not convinced then take : eek: up on his offer.
19 October 2004, 11:01 PM
#15
MAF MAF MAF
This time last year MAF died on PTMW! resulting in the requirement for a new engine
Bloody happened @ Brands on my birthday treat 
Richard Gledhill had his go a month later.
Both costs ££££ to fix in new engines
On MY99 they are a WEAK item that should be replaced on an annual basis, otherwise expect a £2k+ bill
Replace the Lambda sensor at the same time.
Don't fanny about, just do it and if it is not the problem, then at least you know you're safe from that particular fault for a year. It is a false economy to not do it.
This time last year MAF died on PTMW! resulting in the requirement for a new engine
Bloody happened @ Brands on my birthday treat Richard Gledhill had his go a month later.
Both costs ££££ to fix in new engines
On MY99 they are a WEAK item that should be replaced on an annual basis, otherwise expect a £2k+ bill
Replace the Lambda sensor at the same time.
Don't fanny about, just do it and if it is not the problem, then at least you know you're safe from that particular fault for a year. It is a false economy to not do it.
20 October 2004, 09:12 PM
#17
Scooby Regular
Join Date: Mar 2002
Location: High Wycombe BUCKS
Posts: 2,288
Likes: 0
Received 0 Likes
on
0 Posts
Derpil
As i said to you on the phone 2 hrs after you picked up the car i would almost gaurentee your maf was on the way out as you described the symptoms to me
As the battery had been disconected i would hazard that that was your problem I have a maf i can also get a maf from eek so if you bring the car over i will change it for you
All i can say is that as far as i am aware all the work that i have done should not have affected it.
I have left a message on your ansa phone too
Gossy
As i said to you on the phone 2 hrs after you picked up the car i would almost gaurentee your maf was on the way out as you described the symptoms to me
As the battery had been disconected i would hazard that that was your problem I have a maf i can also get a maf from eek so if you bring the car over i will change it for you
All i can say is that as far as i am aware all the work that i have done should not have affected it.
I have left a message on your ansa phone too
Gossy
21 October 2004, 08:15 AM
#20
Scooby Regular
Join Date: Mar 2002
Location: High Wycombe BUCKS
Posts: 2,288
Likes: 0
Received 0 Likes
on
0 Posts
oh and if you need anymore proof read this thread http://bbs.scoobynet.co.uk/showthread.php?t=371439
21 October 2004, 07:31 PM
#21
Scooby Regular
Gossy the only way the work you have done that would affect the car, is the pure and simple fact that the battery/ecu had been disconnected, resulting in the learning of the failed maf to be lost
But I guess you knew that anyway
70 quid is better than a new engine , no matter how anyone looks at it
But I guess you knew that anyway
70 quid is better than a new engine , no matter how anyone looks at it
21 October 2004, 09:19 PM
#22
Scooby Regular
Thread Starter
Join Date: Sep 2001
Location: london
Posts: 819
Likes: 0
Received 0 Likes
on
0 Posts
thanks for every ones input.much appreciated.
i bought the maf sensor today .will be fitted on the weekend.
thanks to eek for offering his maf
and thanks to gossy for his advise and texting me with the part number.
the original post may have unintentionaly implied that gossys work related to the problem .so i would like to state that the problem is not related to gossy in any way. what i was trying to put across was wheather ,if the mods themselves caused the maf failure[ie decat downpipe etc.] or whether it was already going/gone.
thanks again peeps!
i bought the maf sensor today .will be fitted on the weekend.
thanks to eek for offering his maf
and thanks to gossy for his advise and texting me with the part number.
the original post may have unintentionaly implied that gossys work related to the problem .so i would like to state that the problem is not related to gossy in any way. what i was trying to put across was wheather ,if the mods themselves caused the maf failure[ie decat downpipe etc.] or whether it was already going/gone.
thanks again peeps!
Thread
Thread Starter
Forum
Replies
Last Post
Mattybr5@MB Developments
Full Cars Breaking For Spares
28
28 December 2015 11:07 PM
Mattybr5@MB Developments
Full Cars Breaking For Spares
12
18 November 2015 07:03 AM
supshon
General Technical
2
03 October 2015 08:06 PM
