Headers cause of problem!???
#1
Headers cause of problem!???
I recently uprated my headers and up pipe.
Ever since doing this, ive noticed on the air/fuel gauge, that the car is running lean!
I drove it for a week or so not putting my foot down, and noticed over time that once the car was warm, (but not when cold) it would struggle low down the revs but was fine when you put your foot down, almost like a poor spark or lack of fuel.
I also noticed the knocklink light lighting up on high revs.
This problem got worse over days and made the car a bit of a pain to drive round town, so I went with the cheap option first and put some new super 7 plugs in. Fixed it momentarly, (around 40 miles) then resorted back to the same problem.
I also notice that the knocklink light's up sooner, around 4-5 rpm since I replaced the plugs.
Has any one got any idea what the f**k is going wrong!
Im wondering if a lack of fuel is causing knocking in the engine!?
Or is somthing else wrong!?
Scooby Clinic are going to get it on the rollers next week for a remapp and sayed they'll work out whats going wrong.
Any ideas would be great, the cars a version 3 STI Type R.
Cheers Shimy.
Ever since doing this, ive noticed on the air/fuel gauge, that the car is running lean!
I drove it for a week or so not putting my foot down, and noticed over time that once the car was warm, (but not when cold) it would struggle low down the revs but was fine when you put your foot down, almost like a poor spark or lack of fuel.
I also noticed the knocklink light lighting up on high revs.
This problem got worse over days and made the car a bit of a pain to drive round town, so I went with the cheap option first and put some new super 7 plugs in. Fixed it momentarly, (around 40 miles) then resorted back to the same problem.
I also notice that the knocklink light's up sooner, around 4-5 rpm since I replaced the plugs.
Has any one got any idea what the f**k is going wrong!
Im wondering if a lack of fuel is causing knocking in the engine!?
Or is somthing else wrong!?
Scooby Clinic are going to get it on the rollers next week for a remapp and sayed they'll work out whats going wrong.
Any ideas would be great, the cars a version 3 STI Type R.
Cheers Shimy.
#2
Scooby Regular
iTrader: (15)
Join Date: Jul 2001
Location: Portsmouth
Posts: 8,606
Likes: 0
Received 0 Likes
on
0 Posts
headers will allow more air into the mixture, without the necessary increase in fuelling with it, surely thats the cause of your leanness?
remap should sort it no worries.
could be wrong though...
remap should sort it no worries.
could be wrong though...
#3
Originally Posted by Peanuts
headers will allow more air into the mixture, without the necessary increase in fuelling with it, surely thats the cause of your leanness?
remap should sort it no worries.
could be wrong though...
remap should sort it no worries.
could be wrong though...
Yeah I was thinking the same thing peanuts!
I do find that if I sit at a steady speed for a while the mixture increases and gose back to normal, but then when I stop it gose back to lean.
Cheers Shimy.
#4
Scooby Regular
Join Date: Apr 2002
Location: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
Posts: 7,333
Likes: 0
Received 0 Likes
on
0 Posts
Remap will sort it.
It will be expelling exhaust gas quicker and more efficiently than before, which means mr turbo will be kicking in a bit earlier, and you will also find the headers require extra fuelling at high rpm (did on mine while being mapped)
MB
It will be expelling exhaust gas quicker and more efficiently than before, which means mr turbo will be kicking in a bit earlier, and you will also find the headers require extra fuelling at high rpm (did on mine while being mapped)
MB
#5
Scooby Regular
Join Date: Dec 2002
Location: devon
Posts: 2,944
Likes: 0
Received 0 Likes
on
0 Posts
i had my 1st re-map without my aftermarket headers
then fitted them and went to bob for 2nd re-map
car was also running lean
but sorted now , so you should be ok after re-map bud
daz
then fitted them and went to bob for 2nd re-map
car was also running lean
but sorted now , so you should be ok after re-map bud
daz
#6
Scooby Regular
Join Date: Jun 2002
Location: Nottingham
Posts: 5,285
Likes: 0
Received 0 Likes
on
0 Posts
as a short term- if you have an adjstable fuel pressure regulator (and guage!) turn up the fuel pressure a bit...
it's only a band aid tho.
remap is the safest route imo.. just resist the urge to nail the car until its done
did the clinic lads advise this would happen?
I expect from past experience that they would have done
did you listen to them is the question..
it's only a band aid tho.
remap is the safest route imo.. just resist the urge to nail the car until its done
did the clinic lads advise this would happen?
I expect from past experience that they would have done
did you listen to them is the question..
Last edited by chrome; 08 February 2005 at 12:15 AM.
Trending Topics
#10
Cheers for the reply's lads!
Yeah the Clinic did advise me on saturday to wait until next week to get it mapped on there rollers, and to take it easy until then.
There going to fit an uprated fuel pump to her aswell, cause as said before, its just about on its limit.
Fingers crossed for the re mapp then .
Do any of you guys know if the fact of it running lean is the cause for the knocklink sensor to be going off?
Cheers Shimy.
Yeah the Clinic did advise me on saturday to wait until next week to get it mapped on there rollers, and to take it easy until then.
There going to fit an uprated fuel pump to her aswell, cause as said before, its just about on its limit.
Fingers crossed for the re mapp then .
Do any of you guys know if the fact of it running lean is the cause for the knocklink sensor to be going off?
Cheers Shimy.
#11
Scooby Regular
Join Date: Apr 2002
Location: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
Posts: 7,333
Likes: 0
Received 0 Likes
on
0 Posts
My STi5 has headers, full 3" decat and uprated panel and didn't need an uprated pump. Not saying you shouldn't, but it doesnt "need" one. Any further mods and I have to have one
Primary cause of det is lean mixture, so more than likely the headers is the cause. See what SC say when its on the rollers.
MB
Primary cause of det is lean mixture, so more than likely the headers is the cause. See what SC say when its on the rollers.
MB
#12
Originally Posted by Dark Blue Mark
My STi5 has headers, full 3" decat and uprated panel and didn't need an uprated pump. Not saying you shouldn't, but it doesnt "need" one. Any further mods and I have to have one
Primary cause of det is lean mixture, so more than likely the headers is the cause. See what SC say when its on the rollers.
MB
Primary cause of det is lean mixture, so more than likely the headers is the cause. See what SC say when its on the rollers.
MB
Cheers Mark.
I had a feeling that this was causing detting.
Scooby clinic will have the rollers all set up by the end of this week so i'll see what they come up with.
I'll report back and let you lads know what the out come is.
Cheers lads, Shimy.
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