Click to go to Forum Home Click to go to maXbimmer Home

Go Back   maXbimmer Forums > Specific Regional Topics > Quebec/Gatineau/Ottawa
User Name
Password


Welcome to Maxbimmer.com!

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-31-2012, 02:58 PM   #1
bmdbley'sBro
wouldu like some tinfoil?
 
bmdbley'sBro's Avatar
 
Join Date: Apr 2005
Location: in your attic!
Posts: 4,655
what could cause this weird idle behavior on a E36?

idles all over the place, but constantly climbs up to 1500 rpm's sitting at an intersection.
now it surges up & down 1200-1500, 1200, 1500.
ICV was just replaced - still doing it.

I recall I had this behavior when an 02 sensor went bad waaayy back.
anywho the car is turbo'd but this all going on while not in boost but in stock vacume, especially when its idling at a stop light..

Ideas?

*oh, also any one got a peak scanner?
__________________
bmdbley'sBro is offline   Reply With Quote
Old 10-31-2012, 03:47 PM   #2
sb_600
5th Gear Member
 
sb_600's Avatar
 
Join Date: Apr 2010
Location: Ottawa, ON
Posts: 1,195
sounds like a vacuum leak to me
__________________
Shawn
1992 BMW 325i (CHUMPCAR #296 - Metric Homes Racing)
1992 3.0L M52 325i (ex-daily driver - track car only)
2002 330Ci (ex-daily driver - sold!)

sb_600 is offline   Reply With Quote
Old 10-31-2012, 04:30 PM   #3
bmdbley'sBro
wouldu like some tinfoil?
 
bmdbley'sBro's Avatar
 
Join Date: Apr 2005
Location: in your attic!
Posts: 4,655
Quote:
Originally Posted by sb_600 View Post
sounds like a vacuum leak to me
thats what i thought too - but nothing can be heard leak wise.

I read about a tricky to find brake booster or master cylinder vac leak - how would one tell if that was the cause?
__________________
bmdbley'sBro is offline   Reply With Quote
Old 10-31-2012, 04:34 PM   #4
sb_600
5th Gear Member
 
sb_600's Avatar
 
Join Date: Apr 2010
Location: Ottawa, ON
Posts: 1,195
yeah you won't hear the leak.

spray some brake cleaner or something flammable that will evaporate on all your vacuum lines (make sure you don't get it on your headers or it'll burn!) if you idle surges, that's where your leak is.

also check the intake elbow - those are known to crack over time.

I can't remember what the brake booster/MC trick is..... sorry!
__________________
Shawn
1992 BMW 325i (CHUMPCAR #296 - Metric Homes Racing)
1992 3.0L M52 325i (ex-daily driver - track car only)
2002 330Ci (ex-daily driver - sold!)

sb_600 is offline   Reply With Quote
Old 10-31-2012, 07:57 PM   #5
Goodtohave
2nd Gear Member
 
Join Date: Feb 2011
Location: Canada
Posts: 80
If you want to check the O2 sensor just unplug it from the other end under the hood.

Easy to do...I drove my M50 525 for over a year with the O2 sensor unplugged.
Goodtohave is offline   Reply With Quote
Old 11-01-2012, 09:09 PM   #6
bmdbley'sBro
wouldu like some tinfoil?
 
bmdbley'sBro's Avatar
 
Join Date: Apr 2005
Location: in your attic!
Posts: 4,655
So, got in there & uncliped the rear 02 sensor - didn't help anything.

I'll get my codes later:

Reading BMW Fuel Injection Fault Codes
http://www.pelicanparts.com/BMW/tech...de_Reading.htm
__________________
bmdbley'sBro is offline   Reply With Quote
Old 11-01-2012, 09:22 PM   #7
sb_600
5th Gear Member
 
sb_600's Avatar
 
Join Date: Apr 2010
Location: Ottawa, ON
Posts: 1,195
The rear o2 won't do anything. All it does is make sure the cat works properly. You need to try the front one
__________________
Shawn
1992 BMW 325i (CHUMPCAR #296 - Metric Homes Racing)
1992 3.0L M52 325i (ex-daily driver - track car only)
2002 330Ci (ex-daily driver - sold!)

sb_600 is offline   Reply With Quote
Old 11-01-2012, 11:13 PM   #8
jeffrie
Addict
 
jeffrie's Avatar
 
Join Date: Jun 2004
Location: Buckingham
Posts: 2,251
How does it respond to a little throttle and how does it act with boost when idel is surging? Any miss or hesitation to rev up off idel or sluggishness till boost kicks in under load?
__________________
"They say ignorance is bliss..... I don't know what the Fu*k that means but I'm pretty happy". Ricky Trailer Park Boys.


Current Mods....X-Brace, Stromung Cat Back Exhaust, 17/225/45 M3 Replicas, HotBits Adjustable Coil Overs, 40% LSD 3:91 Diff, E30 Gearbox, Boosted.
jeffrie is offline   Reply With Quote
Old 11-01-2012, 11:57 PM   #9
Blackedout95
5th Gear Member
 
Join Date: Feb 2009
Location: Canada
Posts: 1,084
Its not incredibly common but here's a thought!

Unplug you TPS and see what happens

From there plug it back in and your TPS should be reading .07-8 at idle if I recall (you mentioned it happened when sitting). I would then if confirmed that is not reading correctly ( higher than .07-.08v at idle) look at the actual TB rod, would bet you have a flat spot and rod needs adjusting... You see if the reading is higher it has to have gotten that reading from somewhere

So adjust the rod angle or new TB, either way and retest v output.

Again just a shot in the dark but if all the obvious first things don't pan out, take a look. GL hope is something simple.
__________________
E46

Last edited by Blackedout95; 11-02-2012 at 12:00 AM.
Blackedout95 is offline   Reply With Quote
Old 11-02-2012, 07:45 PM   #10
bmdbley'sBro
wouldu like some tinfoil?
 
bmdbley'sBro's Avatar
 
Join Date: Apr 2005
Location: in your attic!
Posts: 4,655
Quote:
Originally Posted by sb_600 View Post
The rear o2 won't do anything. All it does is make sure the cat works properly. You need to try the front one
I have a wideband o2 where the primary should be. before that it was going to a af/gauge ..so the check engine light has Always been on. but the idling this high & reving up & down at 1500rpm is new.

Quote:
Originally Posted by jeffrie View Post
How does it respond to a little throttle and how does it act with boost when idel is surging? Any miss or hesitation to rev up off idel or sluggishness till boost kicks in under load?
it actually did feel like the car was squating on decel & lifting on throtle at low speeds..? rest of the q's require details: cars was running mint forever @7lbs. got rpm to install a wideband02, walboro pump & larger injectors from a v8. he said there was a nick in an injector wire & it was konking out when testing - he fixed that. car ran great for weeks. I eventually hooked up with barry to retune for 14.5 -15lbs. things went wonky. first we couldn't get the manual boost controller to give us more than 10lbs. he/we thought leak or messed up spring in the wastegate or b.controller. during this the car developed Stuttering at low boost. after barry hooked up a leak tester to my intake tubing to see if we could see what was up. we discoverd that 20+psi was blowing oil back Up my turbo feed line & that my turbo is leaking on the intake side. we stopped there. rpm put in new plugs & hooked intake cleaner up to the fuel rail. car ran better, boosted Higher before hesitation, or hickup. which could be over boost, boost leak, turbo leaking oil, fuxored spring or idk wtf...

then the high idle started it now does it 90% of the time

Quote:
Originally Posted by Blackedout95 View Post
Its not incredibly common but here's a thought!

Unplug you TPS and see what happens

From there plug it back in and your TPS should be reading .07-8 at idle if I recall (you mentioned it happened when sitting). I would then if confirmed that is not reading correctly ( higher than .07-.08v at idle) look at the actual TB rod, would bet you have a flat spot and rod needs adjusting... You see if the reading is higher it has to have gotten that reading from somewhere

So adjust the rod angle or new TB, either way and retest v output.

Again just a shot in the dark but if all the obvious first things don't pan out, take a look. GL hope is something simple.
unplugged it still idled high. but the car was still cold. don't have a volt/amp tester so I can't check its values..

-
did the fault code thing, if i did it right, it kept repeating 1222 'Oxygen Sensor Lean/Rich Detect (primary)'

will do it again, shut it off before it cleared as it seemed to just be repeating 1222 over & over forever...

Anybody want a rusty crusty project car?
__________________

Last edited by bmdbley'sBro; 11-02-2012 at 07:47 PM.
bmdbley'sBro is offline   Reply With Quote
Old 11-02-2012, 08:15 PM   #11
Blackedout95
5th Gear Member
 
Join Date: Feb 2009
Location: Canada
Posts: 1,084
That code is common when the car detects a lean or rich condition, what it points to is what we have already discussed above like vac leak, maf, TB etc and including an O2 sensor but not for sure as again could be other things and not the 02.

Bottom line car is runing rich or lean and with a simple volt check of the TPS you can rule out the TB Better yet take theTB off and inspect it and clean it, look for flat spots on the rod. Nothing but time and some cleaner involved.

I am sure a mechanic would do that check for a minimal fee and considering you have yet to find the issue it may just be the TB or 02...while your in a shop get the data on the MAF while running, that too could cause the issue and in about 5 minutes if you were near me I could hook up the vedis and see what type of MAF number you are showing.
__________________
E46

Last edited by Blackedout95; 11-02-2012 at 08:19 PM.
Blackedout95 is offline   Reply With Quote
Old 11-10-2012, 06:33 PM   #12
bmdbley'sBro
wouldu like some tinfoil?
 
bmdbley'sBro's Avatar
 
Join Date: Apr 2005
Location: in your attic!
Posts: 4,655
so: the tps unplugged with the car warm saw idles of 2100rpm.

anywho so the car was back at rpm he found a Gasket leak at the start of the charge/intake piping right near the turbo, changed that. also said my Blow off valve seems weak, which might also explain the hi idle & why i could not get above 10lbs..

so...guess i need to test/replace my blow off valve..
I'm going to replace the leaking turbo with hopefully something Cheap & factory on another car.
__________________
bmdbley'sBro is offline   Reply With Quote
Old 11-10-2012, 08:43 PM   #13
Blackedout95
5th Gear Member
 
Join Date: Feb 2009
Location: Canada
Posts: 1,084
So was that it,gasket leak, idle down now?
__________________
E46
Blackedout95 is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 06:08 AM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.