BMW People - Would a blowing Exhaust cause a missfire???

DanCossie · 12-08-2009, 10:32 AM

I had the coils sorted and the car serviced at the weekend and it runs alot better but it still has a really small missfire....The guy who done it said that my exhaust is blowing which to be honest it is...he said this could be causing it to miss.

anyone know if this is true?

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Chip · 12-08-2009, 10:33 AM

Yes it could be, particuarly if its blowing in front of the lambda sensor.

DanCossie · 12-08-2009, 10:37 AM

Quote:

Originally Posted by Chip

Yes it could be, particuarly if its blowing in front of the lambda sensor.

Well i bought a new exhaust and it only has 2 sections the cat at the front and the rear section which is very long...on the diagnostic machine it has a fault code regarding the o2 sensor...would this show up becuase of the exhaust ??

Lee_R21Turbo · 12-08-2009, 10:45 AM

Check for air leaks aswell mate!!

What beemer is it?

bristol_fez · 12-08-2009, 10:49 AM

The plastic intake is prone to spliting and causing a missfire.

DanCossie · 12-08-2009, 11:01 AM

E36 325....

What do you mean about plastic inlets and that??? sorry im gay lol

stu21t · 12-08-2009, 11:02 AM

O2 sensor is the lambda sensor, if that's faulty it will b causing the miss as well as overfuelling.
If the blow is before the sensor it will show the lambda too much oxygen and then the lambda will compensate with extra fuel, that's not needed.
Depending on how bad the blow is it could cause back pressure problems.
Ever since I decatted my m3 I've had an intermittant miss, and I've got a proper decat with resonating boxes. A remap will sort this tho.

In short, fix the blow, lol
to find it easily, start the car and hold a rag over the tailpipe, the gas will come out of the hole and you'll hear it.

Chip · 12-08-2009, 11:02 AM

Try unplugging the lambda sensor, it should run fine without it, but wont run fine with it not working correctly.

bristol_fez · 12-08-2009, 11:07 AM

Quote:

Originally Posted by DanCossie

E36 325....

What do you mean about plastic inlets and that??? sorry im gay lol

The hose between the airbox and throttle body is prone to spliting and causing a missfire. easy to take of and check.

Lee_R21Turbo · 12-08-2009, 11:17 AM

As bristol_fez says....

This pipe...

Ginge ! · 13-08-2009, 10:22 AM

a hole in the exhaust or airleak will cause a missfire effect on idle, lambda sensor fucked or not will still cause it can still cause it to run rough, that also includes a leak after the lamda sensor... i now this as my clio has a hole in the exhaust and when i sealed it the missfire/slight rough idle dissapeared

also check for oil leaking from rocker cover aswell

WHY did you buy a e36 325 and get rid of the jag ?

AlexF · 13-08-2009, 10:26 AM

Me thinks the Jag was too fast for him

Ginge ! · 13-08-2009, 10:30 AM

me thinks maintanance/running costs was too much for him

alex,,,, can i use a later timing chain tensioner for a e36 325 on the earlier engine,, mine weeping and i want to get the car up and running again as,,,, well driving 150 miles in a fucking clio has killed my knees,,,, not to mention the the lifting of the front/loose steering at 85mph plus....

i wanna use my bm again as that loved motorways !

DanCossie · 13-08-2009, 10:34 AM

I got rid of the Jag ginge as it got smashed up actually !!! sod all to do with maintanance/running costs thank you very much....i would still have it now as i loved it, i think i can afford to run 1 jag on my salary mate i dont work in Halfords ya know lol

And Alex it wasnt too fast for me at all was actually a very nice car.

AlexF · 13-08-2009, 10:40 AM

ooooooo touchy

AlexF · 13-08-2009, 10:41 AM

Quote:

Originally Posted by Ginge !

me thinks maintanance/running costs was too much for him

alex,,,, can i use a later timing chain tensioner for a e36 325 on the earlier engine,, mine weeping and i want to get the car up and running again as,,,, well driving 150 miles in a fucking clio has killed my knees,,,, not to mention the the lifting of the front/loose steering at 85mph plus....

i wanna use my bm again as that loved motorways !

Do the part numbers match?

cossiestu · 13-08-2009, 10:47 AM

Mine (320 E46) sounds as if its got a slight blow, but been under it and cant see/feel anything, but it does have a random missfire, when you pull away you have no power whatsoever... Only does it now an then, but bloody annoying!!!

Ginge ! · 13-08-2009, 10:48 AM

no as the later 325 E36 engine has the tensioner as a complete unit,, the ealier one you can buy it in parts like the piston, spring, washer blah blah blah

i sell the complete tensioner so can "warranty" one but we dont do the earlier one

aint sure what BMW charge for it or what part i need so its easier to just buy the complete unit off the shelf

Ginge ! · 13-08-2009, 10:49 AM

Quote:

Originally Posted by cossiestu

Mine (320 E46) sounds as if its got a slight blow, but been under it and cant see/feel anything, but it does have a random missfire, when you pull away you have no power whatsoever... Only does it now an then, but bloody annoying!!!

no power aint the same as a slight blow on the exhaust mate, get someone to cover the tail pipe ( not with hand) and get a bit of hose pipe. one part in your ear and the other along the exhaust and you will find the blow

1098 · 13-08-2009, 11:04 AM

Quote:

Originally Posted by bristol_fez

The plastic intake is prone to spliting and causing a missfire.

+1!

Definitely check this.

DanCossie · 13-08-2009, 11:51 AM

Quote:

Originally Posted by 1098

+1!

Definitely check this.

Were actually is this in relation to the engine bay???

Lee_R21Turbo · 13-08-2009, 12:18 PM

Dan....theres a bloody picture there you numpty!!!

Its on the right hand side of the engine bay inbetween the airbox & the throttle!!

DanCossie · 13-08-2009, 12:29 PM

Quote:

Originally Posted by Lee_R21Turbo

Dan....theres a bloody picture there you numpty!!!

Its on the right hand side of the engine bay inbetween the airbox & the throttle!!

Lee im gay come on

Thanks mate i will have a look at lunch

Lee_R21Turbo · 13-08-2009, 12:32 PM

Exactly.....if I'd of shoved some young lads arse hole in the engine bay I'm sure you'd of found it very easily!!!

Ginge ! · 13-08-2009, 12:32 PM

Quote:

Originally Posted by Lee_R21Turbo

Dan....theres a bloody picture there you numpty!!!

Its on the right hand side of the engine bay inbetween the airbox & the throttle!!

you do know hes gonna be looking between the airbox and the accelerator pedal dont you !

DanCossie · 13-08-2009, 12:39 PM

Quote:

Originally Posted by Lee_R21Turbo

Exactly.....if I'd of shoved some young lads arse hole in the engine bay I'm sure you'd of found it very easily!!!

hahahahaah love it

and i probably could

DanCossie · 13-08-2009, 12:42 PM

Quote:

Originally Posted by Ginge !

you do know hes gonna be looking between the airbox and the accelerator pedal dont you !

i know were the airbox is ginge and the throttle body i aint that stupid

Asturias · 13-08-2009, 05:47 PM

Ive seen naffed ecu's cause a misfire on these.

12-08-2009, 10:33 AM	#2
Chip * Sierra RS Custard * Garage is empty, add now Trader Score: (3) Join Date: Dec 2006 Posts: 44,611 Rep Power: 51	Yes it could be, particuarly if its blowing in front of the lambda sensor. __________________ Sometimes its more fun not to care if things make sense, and just do them anyway! Vauxhall Nova, Mid Engined, RWD, 457bhp, Autronic SM4, GT35R, Quaiffe ATB Diff 2.0 16v - DIY Specced, DIY Built, DIY Mapped, DIY Abused www.VauxSport.com

12-08-2009, 10:45 AM	#4
Lee_R21Turbo PassionFord Post Whore!! Garage is empty, add now Trader Score: (1) Join Date: May 2004 Location: Liverpool :o) Posts: 4,720 Rep Power: 12	Check for air leaks aswell mate!! What beemer is it? __________________ Cheers Lee 'Just Modify It' Renault 21 Cosworth, Volkswagen Bora Daily Drive, Renault Clio 172 Track Toy

12-08-2009, 10:49 AM	#5
bristol_fez Too many posts.. I need a life!! Garage is empty, add now Trader Score: (1) Join Date: Feb 2005 Location: Bath Posts: 540 Rep Power: 8	The plastic intake is prone to spliting and causing a missfire. __________________ O dear i have bought a BMW....that she wrote off. Now driving Octavia VRS

12-08-2009, 11:02 AM	#7
stu21t PassionFord Post Troll Garage is empty, add now Trader Score: (0) Join Date: Oct 2004 Location: south london Posts: 2,835 Rep Power: 10	O2 sensor is the lambda sensor, if that's faulty it will b causing the miss as well as overfuelling. If the blow is before the sensor it will show the lambda too much oxygen and then the lambda will compensate with extra fuel, that's not needed. Depending on how bad the blow is it could cause back pressure problems. Ever since I decatted my m3 I've had an intermittant miss, and I've got a proper decat with resonating boxes. A remap will sort this tho. In short, fix the blow, lol to find it easily, start the car and hold a rag over the tailpipe, the gas will come out of the hole and you'll hear it. __________________ link to my cossie powered renault 5 http://passionford.com/forum/restora...nault-5-a.html

12-08-2009, 11:02 AM	#8
Chip * Sierra RS Custard * Garage is empty, add now Trader Score: (3) Join Date: Dec 2006 Posts: 44,611 Rep Power: 51	Try unplugging the lambda sensor, it should run fine without it, but wont run fine with it not working correctly. __________________ Sometimes its more fun not to care if things make sense, and just do them anyway! Vauxhall Nova, Mid Engined, RWD, 457bhp, Autronic SM4, GT35R, Quaiffe ATB Diff 2.0 16v - DIY Specced, DIY Built, DIY Mapped, DIY Abused www.VauxSport.com

12-08-2009, 11:01 AM	#6
DanCossie Post Whore 2004 BMW M3 Trader Score: (1) Join Date: Sep 2007 Location: Camden Posts: 6,464 Rep Power: 11	E36 325.... What do you mean about plastic inlets and that??? sorry im gay lol

12-08-2009, 11:17 AM	#10
Lee_R21Turbo PassionFord Post Whore!! Garage is empty, add now Trader Score: (1) Join Date: May 2004 Location: Liverpool :o) Posts: 4,720 Rep Power: 12	As bristol_fez says.... This pipe... __________________ Cheers Lee 'Just Modify It' Renault 21 Cosworth, Volkswagen Bora Daily Drive, Renault Clio 172 Track Toy

13-08-2009, 10:26 AM	#12
AlexF 10K+ Poster!! Garage is empty, add now Trader Score: (0) Join Date: May 2003 Location: Newbury Posts: 13,127 Rep Power: 22	Me thinks the Jag was too fast for him __________________ "Judging by the car you have chosen, you are a motorist of a special breed, and you are probably no novice when it comes to automobiles." . . . 928 S4 Owner's Manual 1987

13-08-2009, 10:34 AM	#14
DanCossie Post Whore 2004 BMW M3 Trader Score: (1) Join Date: Sep 2007 Location: Camden Posts: 6,464 Rep Power: 11	I got rid of the Jag ginge as it got smashed up actually !!! sod all to do with maintanance/running costs thank you very much....i would still have it now as i loved it, i think i can afford to run 1 jag on my salary mate i dont work in Halfords ya know lol And Alex it wasnt too fast for me at all was actually a very nice car.

13-08-2009, 10:40 AM	#15
AlexF 10K+ Poster!! Garage is empty, add now Trader Score: (0) Join Date: May 2003 Location: Newbury Posts: 13,127 Rep Power: 22	ooooooo touchy __________________ "Judging by the car you have chosen, you are a motorist of a special breed, and you are probably no novice when it comes to automobiles." . . . 928 S4 Owner's Manual 1987

13-08-2009, 10:47 AM	#17
cossiestu Advanced PassionFord User Garage is empty, add now Trader Score: (0) Join Date: May 2004 Location: West Norfolk,near the 'Bech Posts: 2,198 Rep Power: 10	Mine (320 E46) sounds as if its got a slight blow, but been under it and cant see/feel anything, but it does have a random missfire, when you pull away you have no power whatsoever... Only does it now an then, but bloody annoying!!! __________________

13-08-2009, 12:18 PM	#22
Lee_R21Turbo PassionFord Post Whore!! Garage is empty, add now Trader Score: (1) Join Date: May 2004 Location: Liverpool :o) Posts: 4,720 Rep Power: 12	Dan....theres a bloody picture there you numpty!!! Its on the right hand side of the engine bay inbetween the airbox & the throttle!! __________________ Cheers Lee 'Just Modify It' Renault 21 Cosworth, Volkswagen Bora Daily Drive, Renault Clio 172 Track Toy

13-08-2009, 12:32 PM	#24
Lee_R21Turbo PassionFord Post Whore!! Garage is empty, add now Trader Score: (1) Join Date: May 2004 Location: Liverpool :o) Posts: 4,720 Rep Power: 12	Exactly.....if I'd of shoved some young lads arse hole in the engine bay I'm sure you'd of found it very easily!!! __________________ Cheers Lee 'Just Modify It' Renault 21 Cosworth, Volkswagen Bora Daily Drive, Renault Clio 172 Track Toy

13-08-2009, 05:47 PM	#28
Asturias Part of the Furniture Garage is empty, add now Trader Score: (0) Join Date: Jul 2007 Posts: 164 Rep Power: 5	Ive seen naffed ecu's cause a misfire on these. __________________ E39 M5 & 4x4 Cossie The 400BHP twins!

13-08-2009, 05:47 PM
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