Every gear every 2-3000rpm, can hear some "bobo" air sound come from the exhaust and the car not going fast even floor it, but after 3000rpm, it goes normal.

All keep original only run with K&N Filter and AC exhaust.

Any ideas of it? Thanks

hehe explain the "bobo" in more detail.

honam...you got your new ride already?
you are welcome to goto my garage to try whatever is there from my 3.0

forgot to tell you...no it is not running too lean!!!

honam...you got your new ride already?
you are welcome to goto my garage to try whatever is there from my 3.0

:lol:lol.......Sure. Was gonna to reply I am not in US and regonize thats you.:buttrock

:lol:lol.......Sure. Was gonna to reply I am not in US and regonize thats you.:buttrock

have you managed to find out what is happening? I'm having the same issue between 2000-2500rpm, only if I accelerate slowly(cruising). on full throttle the hesitation dissapears

have you managed to find out what is happening? I'm having the same issue between 2000-2500rpm, only if I accelerate slowly(cruising). on full throttle the hesitation dissapears

Not yet, but guess maybe around the intake side

Not yet, but guess maybe around the intake side

do you suspect a leak or smth? I think that is something to do with a sensor .. maybe camshaft ?

kindof like a gurgling noise? If so i got the same sound which sounds like bogging sound matching the valves opening inside the manifold, with my exhaust i can no longer hear the intake at all :P

kindof like a gurgling noise? If so i got the same sound which sounds like bogging sound matching the valves opening inside the manifold, with my exhaust i can no longer hear the intake at all :P

if u are asking me, the sound i got is just like a misfire. it sounds strange on the exhausts, it doesn't rev, and it feels like i'm running 4 cylinders or smth...

only on slow acceleration, between 2000-2500rpm, besides this, it's all good

do yo actually feel the puttering like misfiring? When was the last time you checked the plugs?

do yo actually feel the puttering like misfiring? When was the last time you checked the plugs?

yeah.. i was thinking about the plugs too, but if they were the fault, i guess that it wouldn't feel anything wrong only at that rpm ?

i will change them anyway...

you would be suprised what bad gapped plugs will do....i bet they are black and double the recommended gap....mine were denso plugs that were 3 times the recommended gap....due to age

I had really rough idle and low speed surging, but it seem'd fine at WOT, but once new ones were in!!!!damn

I had really rough idle and low speed surging, but it seem'd fine at WOT, but once new ones were in!!!!damn

well, that's the next thing i'll do. i hope that they will make the difference

what do u recommend ? stock bosch ? i have a s50b30

thanks! :D

I put new plugs in and it made squat difference.Maybe I should have set the gap-but isn't that old school?

hahahah gap makes alot of difference, i bet alan can back that one up

hahahah gap makes alot of difference, i bet alan can back that one up

Damn! another job!

hahahah gap makes alot of difference, i bet alan can back that one up

i don't know anything about setting the gap. don't they come in the recommended gap ?

propper ones do but allways check, some plugs are multi engine and diff engines have diff gaps :|

propper ones do but allways check, some plugs are multi engine and diff engines have diff gaps :|

so which ones should i look for ? are the stock bosch ones ok?

Bosch sucks....go for the NGK Iridium, and if you are running forced induction i have recommended upgrade plugs from NGK UK branch ;) so 3 different levels, stock, upgrade-1 and upgrade-2...I beleive they are the same plug so i have 2 hotter then stock for the engine.

Bosch sucks....go for the NGK Iridium, and if you are running forced induction i have recommended upgrade plugs from NGK UK branch ;) so 3 different levels, stock, upgrade-1 and upgrade-2...I beleive they are the same plug so i have 2 hotter then stock for the engine.


the engine is stock.. but i think that ngk's are good only for your engine. mine is the 3 liter one, and from what i know, there are some ngk alternatives for me, but I don't know exactly which ones are good

I was talking to morerevsm3 about it and he thinks the plugs are the same. I will find the email from NGK and ask them what ones are for the 3.0 evo with alternatives

I was talking to morerevsm3 about it and he thinks the plugs are the same. I will find the email from NGK and ask them what ones are for the 3.0 evo with alternatives

thank you very much :)

my engine is s50b30 - 286bhp - i don't think that it's called evo :rolleyes

i just sent the email now, and its 9am in the Uk, so hopefully they will be fast about it.

I have the answer from NGK about the plugs. This should be helpful to all new euro owners and those who are modding as a reference and somewhere to start!

Dear Sir

PKR7A is recommended for the standard vehicle, if you need a colder plug then DCR8EIX is available and DCR9EIX, depending on the modifications made.

We cannot offer you a correct heat range as we do not know the details of the modification.

Regards.


Technical Department


Website: www.ngkntk.co.uk (http://www.ngkntk.co.uk)

question:

Hello again, I have one more question about plugs. Can the same plugs be used on the pre 95 e36 M3 with the S50B30 engine?

Thanks,

[SIZE=2]Hello again, I have one more question about plugs. Can the same plugs be used on the pre 95 e36 M3 with the S50B30 engine?

Thanks,

:thanks:

not a problem Hope that is the root cause!

not a problem Hope that is the root cause!

i was planning to change them anyway, so this information is very important...

And i needed to find that email since i am about to go turbo and will need a colder plug.

And i needed to find that email since i am about to go turbo and will need a colder plug.

any news from them regarding which plugs can i use ?

thanks

there are 3 differnt part numbers listed above. Pkr7a is the stock plug for the s50 engine. By NGK in Iridium form....

there are 3 differnt part numbers listed above. Pkr7a is the stock plug for the s50 engine. By NGK in Iridium form....

pkr7a is stock for s50b32. for s50b30 is bosch y5ddc.

i saw that you've asked about the plugs that will fit s50b30, and i thought that you have an answer

regards

PKR7A <--standard plug
DCR8EIX is next colder
DCR9EIX even colder

same plug dimentions for both versions of bmw goodness

same plug dimentions for both versions of bmw goodness

Ok, thank you.

I will search for the plugs, and I'll let you know

i've changed the plugs .. but with stock bosch ones, and damn... 1st and 2nd gears i don't have any grip at all. there is a huge difference, it's a different engine now

many thanks zparker :D

same thing happened to me when i changed mine...except i have no issues with grip, since the smg changes gears so slow....

Glad i could help. And that noise you heard is gone now correct?

same thing happened to me when i changed mine...except i have no issues with grip, since the smg changes gears so slow....

Glad i could help. And that noise you heard is gone now correct?

it was gone... i don't know what happened, but last night the hesitation was back, and also the car wasn't running like the day before...

have it checked for faults, maybe you have a fault for cam position sensor or maf error or o2 sensor faults. Post back any additional info and ill help out.

have it checked for faults, maybe you have a fault for cam position sensor or maf error or o2 sensor faults. Post back any additional info and ill help out.

I had some O2 sensors faults... but the engine was running ok with these faults a few days ago..

hmm... let me think about this one.

I had replaced the coils, and made no help for this issues too.

I had replaced the coils, and made no help for this issues too.

I was thinking about them, too, but i don't know ...

that hesitation is back, and it's really annoying, especially when the engine is cold, the first 15-20 min after i start the car.
when the engine gets hot, the missfire ins't that obvios, but it's still there, and the car is still slow...

saturday, after i changed the plugs, all those problems were gone, and the car was running like a rocket. second day, the isuues were back.

wtf?!?!?!

Mine does not have max power sometimes in 1st, its like the vanos doesnt kick in all the time. I dont drive it crazy all the time because its so loud (basically straightpipes) i dont want to have to deal with the cops again...

Once i get the turbo done it wont be so loud, but it will freakin move at half throttle :)

As for this wierd ass issue, i am wondering if it could be dirty O2 sensors or MAF.

I know you can clean the o2 sensor with acid, but that is a new one to me. The garage did that on a few different cars that had clogged sensors. It made a huge difference too.

wtf?!?!?!

Mine does not have max power sometimes in 1st, its like the vanos doesnt kick in all the time. I dont drive it crazy all the time because its so loud (basically straightpipes) i dont want to have to deal with the cops again...

Once i get the turbo done it wont be so loud, but it will freakin move at half throttle :)

As for this wierd ass issue, i am wondering if it could be dirty O2 sensors or MAF.

I know you can clean the o2 sensor with acid, but that is a new one to me. The garage did that on a few different cars that had clogged sensors. It made a huge difference too.

i will try that too. i have two o2 sensors sitting in my garage, i will try them on.

do you know which one should be on the first 3 cyl or the last 3 cyl? I saw that the plugs from the o2 are different, one is bigger then the other

I havent had my hands on mine yet so i can not say either.

all you guys did...i had done it on my friend's 3.0
here are what we had tried:
spark plugs
MAF
O2 sensors
ignition coils
fuel pumps and filter
vanos
ECU
valves adjustment

none of the above cure his problem
all the parts exchanged were from my healthy m3...the parts were then installed back onto my car and no problem at all!!!

all you guys did...i had done it on my friend's 3.0
here are what we had tried:
spark plugs
MAF
O2 sensors
ignition coils
fuel pumps and filter
vanos
ECU
valves adjustment

none of the above cure his problem
all the parts exchanged were from my healthy m3...the parts were then installed back onto my car and no problem at all!!!


well that's a pita... I don't think that in my case is something bad, because it has moments when it's running great. my only solution for this moment is to try with other o2 sensors, and recheck the vanos controller plug, because it has some wires with weak connection (the plug was ugly modified , wires cut, etc)


if this won't work, i will have to go to the stealer :(

I was thinking about them, too, but i don't know ...

that hesitation is back, and it's really annoying, especially when the engine is cold, the first 15-20 min after i start the car.
when the engine gets hot, the missfire ins't that obvios, but it's still there, and the car is still slow...

saturday, after i changed the plugs, all those problems were gone, and the car was running like a rocket. second day, the isuues were back.

I have got a try in this week, I floor it all the time and the problem never appear even the engine is cold. Once I drove it very gentle, and the problem would come out when the engine is still cold.

honam...talk to ben...he has the exact same problem as you do!!!
floor it...no problem....it is so difficult to drive like a gentleman with a m3

if u are asking me, the sound i got is just like a misfire. it sounds strange on the exhausts, it doesn't rev, and it feels like i'm running 4 cylinders or smth...

only on slow acceleration, between 2000-2500rpm, besides this, it's all good

Im having the same exact problem, ive changed spark plugs, fuel filter, cleaned the MAF, and the problem remains, now I just bought a new set of "performance" coils from bavauto, hopefully ill get them this week.

Could this be a vanos problem ?

I have the alpha N chips, but havent installed them, maybe ill give it a try, since it could be a MAF problem also, and alpha N gets rid of the MAF....

Have any of you checked the o2 sensors? They could be fouled from the old plugs.

Have any of you checked the o2 sensors? They could be fouled from the old plugs.

if they were fouled, after a ECU reset, they would have the new parameters, right ? I did the reset 2 or 3 times about now


now I just bought a new set of "performance" coils from bavauto, hopefully ill get them this week.

Could this be a vanos problem ?


what kind of coils did u bought ?

it could be a vanos problem, but in my case it appers randomly. i think that it's a electrical problem, a sensor or something.

i will try changing the o2 sensor in a few days, i will keep u updated

If they were fouled and not cleaned they will still be fouled. If you have a jack its pretty easy to get to them. Mine feels like it doesnt fully advance the cam when flooring it in 1st while rolling, but nevertheless it sill moves.... If you get a chance to check the o2's take a picture and post it so we can see how they look. If i can get my car on the lift tonight i will pull mine to see how nasty they are and clean them too.

If they were fouled and not cleaned they will still be fouled. If you have a jack its pretty easy to get to them. Mine feels like it doesnt fully advance the cam when flooring it in 1st while rolling, but nevertheless it sill moves.... If you get a chance to check the o2's take a picture and post it so we can see how they look. If i can get my car on the lift tonight i will pull mine to see how nasty they are and clean them too.

i will check them these days. i have some old o2 sensors that i know they were good. i will also try them. i will try with them unplugged to note any difference.

i can't explain myself why a week ago it was running unbelievable well, and the second day it was back to normal ...

if they were fouled, after a ECU reset, they would have the new parameters, right ? I did the reset 2 or 3 times about now




what kind of coils did u bought ?

it could be a vanos problem, but in my case it appers randomly. i think that it's a electrical problem, a sensor or something.

i will try changing the o2 sensor in a few days, i will keep u updated

I ordered this ones... good deal for $ 248 the set of 6

http://www.bavauto.com/assets/imglib500/5003_6.jpg

My problem it the exact same you have, it appears randomly, so keep us posted on the O2 sensor try ount please.

I ordered this ones... good deal for $ 248 the set of 6

My problem it the exact same you have, it appears randomly, so keep us posted on the O2 sensor try ount please.

those aren't for the s50/m50 engines ?

what else did you change untill now ?

If they were fouled and not cleaned they will still be fouled. If you have a jack its pretty easy to get to them. Mine feels like it doesnt fully advance the cam when flooring it in 1st while rolling, but nevertheless it sill moves.... If you get a chance to check the o2's take a picture and post it so we can see how they look. If i can get my car on the lift tonight i will pull mine to see how nasty they are and clean them too.

in the s50b32's brain somewhere is a sneaky little limiter that doenst give full power in first gear from a rolling start where you hit the gas when on the move. it does give full power from a standing start. be nice to find this little nasty and delete it but its a tricky one to find

I ordered this ones... good deal for $ 248 the set of 6

http://www.bavauto.com/assets/imglib500/5003_6.jpg



Good idea, mind to tell me where to order? thanks.

I know how to fix it in 2 ways. 1. Remap 2. Motec :lol

last night i went out for a little test drive, and here are the conclusions:
the car has the right power only when the engine gets hot. after a cruise for about 2 hours, i turn off the engine, then back on, and voilla - M power ...
untill i do this, it feels like a 2.5 maybe ... after it gets hot, i have torque from 2000rpm all the way up.

i do have a new clue, but i still don't know what could be the issue for the engine being so lazy when cold. maybe the engine tem sensor?

Good idea, mind to tell me where to order? thanks.

those are from bavauto dot com

I know how to fix it in 2 ways. 1. Remap 2. Motec :lol
hehe when i had remap#1 he no fixit, we will see on remap#2

you have the issue on remapping? damn dme is too smart for it own good...

i'm going to cancel the o2 tests for next week, because in the weekend there will be a tuning show, and i must prepare the car on the exterior side :D

i'll keep u updated

next week is over, quit slackin :P

i broke the gearbox meanwhile :D

pretty soon now :P

how did you break the gearbox??? you doin clutch dumps with slicks? lolol

it wasn't a M3 gearbox ... it was from a smaller engine :D i was expecting this...

nice one....see if you can find some m3 gearboxes in 6 speed clothing....i need one.

m3's are pretty rare in romania. especially the 3.2 . surely you will find one in germany.

there are plenty in UK