[GTstunna612]

Changed my plugs to the New NGK plugs at 70k and still getting limp mode at WOT at 120+ mph. Car pulls strong but as soon as i back off the gas car goes into limp mode. Checked for codes and no codes found with the JB4. When I shut car off and turn back on limp mode goes away and car runs fine. I can do only one strong WOT pull then limp mode. Any ideas?

[froop]

It would be near impossible for your car to enter limp mode with no codes being thrown. Have you got auto clear turned on on your JB4?

[GTstunna612]

Auto Clear is off, pulled a few codes and emailed terry he said wasn't a big deal with the codes I got.

[Alucard335iA]

Post them

[Infamy]

Clean ur vanos sensors.

[GTstunna612]

Originally Posted by Alucard335iA

Post them

2FD2
F6C2
9F42
D252
C7B0

[GTstunna612]

Originally Posted by Infamy

Clean ur vanos sensors.

Are you talking about the intake and exhaust VANOS Solenoids? How do you clean them? Might be a DIY out there

[Infamy]

Originally Posted by GTstunna612

Are you talking about the intake and exhaust VANOS Solenoids? How do you clean them? Might be a DIY out there

Yes.. check the DIY on here, it takes 15 mins.

[GTstunna612]

Originally Posted by Infamy

Yes.. check the DIY on here, it takes 15 mins.

It says to clean them with compressed air? Also should I swap them? Intake to exhaust and exhaust to intake?

[Infamy]

Originally Posted by GTstunna612

It says to clean them with compressed air? Also should I swap them? Intake to exhaust and exhaust to intake?

yes air, brake clean,
try it.... couldnt hurt anything

[lol slow]

Originally Posted by GTstunna612

It says to clean them with compressed air? Also should I swap them? Intake to exhaust and exhaust to intake?

no DO NOT swap them.

If cleaning them does not work (it didn't for me) you'll have to replace them.


I'm 99.99% sure they VANOS solenoids are causing your issue. Your symptoms were exactly on point with mine when my solenoids failed.

Very easy to swap them out, parts shouldn't cost you more than $300, give or take.

[d8rknight]

same problems cept no codes... was reading from dash... then ordered USB to read on the laptop nothing... its only on hard pulls 4th gear+ over 5500rpm..

*plugs, and injectors all replaced at 57k. currently at 62k

[GTstunna612]

Originally Posted by lol slow

no DO NOT swap them.

If cleaning them does not work (it didn't for me) you'll have to replace them.


I'm 99.99% sure they VANOS solenoids are causing your issue. Your symptoms were exactly on point with mine when my solenoids failed.

Very easy to swap them out, parts shouldn't cost you more than $300, give or take.

Others said they swapped the intake and the exhaust solenoids?? Should I just clean them with brake cleaner and air then replace them to there original locations?

[GTstunna612]

Originally Posted by d8rknight

same problems cept no codes... was reading from dash... then ordered USB to read on the laptop nothing... its only on hard pulls 4th gear+ over 5500rpm..

*plugs, and injectors all replaced at 57k. currently at 62k

Same here I go into limp mode at high speeds runs as soon as I back off the gas and yes sometimes at high RPMs...did the plugs and injectors fix your issue?

[lol slow]

Originally Posted by GTstunna612

Others said they swapped the intake and the exhaust solenoids?? Should I just clean them with brake cleaner and air then replace them to there original locations?

I read up on the DIY when I was replacing mine and it said to be careful and to make sure you put them back into the original slots. So in your shoes, I'd do the same.

TBH here is what you need to do.

Remove the solenoid and inspect it. If it had gunk and build up on, then clean it (I used brake cleaner) so use that and compressed air. Do that to them both.


BUT

If you pull out the solenoids and they look to be pretty clean or normal, then it's an internal issue, like mine. I wouldn't even waste time putting it back, I'd go and buy 2 new ones right away and put them in. Trust me, limp mode is the most annoying thing in the world, my life has improved ever since I've changed my solenoids, lmao .

[GTstunna612]

Originally Posted by lol slow

I read up on the DIY when I was replacing mine and it said to be careful and to make sure you put them back into the original slots. So in your shoes, I'd do the same.

TBH here is what you need to do.

Remove the solenoid and inspect it. If it had gunk and build up on, then clean it (I used brake cleaner) so use that and compressed air. Do that to them both.


BUT

If you pull out the solenoids and they look to be pretty clean or normal, then it's an internal issue, like mine. I wouldn't even waste time putting it back, I'd go and buy 2 new ones right away and put them in. Trust me, limp mode is the most annoying thing in the world, my life has improved ever since I've changed my solenoids, lmao .

lol yea limp mode is a PITA...yea I'm not gonna swap them around going to leave them in there original locations. Hopefully cleaning them will fix my issue if not then I will need to replace. Any good site to order these VANOS solenoids cheaper rather than dealer? Another thing only sometimes the car will go into limp not all the time at max speeds or high RPMs.

[lol slow]

Originally Posted by GTstunna612

lol yea limp mode is a PITA...yea I'm not gonna swap them around going to leave them in there original locations. Hopefully cleaning them will fix my issue if not then I will need to replace. Any good site to order these VANOS solenoids cheaper rather than dealer? Another thing only sometimes the car will go into limp not all the time at max speeds or high RPMs.

Correct, sometimes I was about to do like one or two WOT pulls and it didn't go into limp mode, but sometimes I'd do like lets say 3rd and 4th gear pull and as my RPM climbs back down slowly and speed reduces, it'd go into limp mode.


Anyways, you can buy OEM stuff on eBay and save some cash. The way I did it was I used a shop that I knew of that had the BMW dealer discount and saved I think it's like 20 or 30% off...I paid $220.00 for both VANOS solenoids.

[GTstunna612]

Well lastnight I took out both of the VANOS solenoids and cleaned them with brake cleaner and compressed air and put them both back in there original locations. Both of the solenoids looked clean no gunk or buildup on them. Test drove the car it feels more responsive. Did a few hard pulls from 30, and 40 MPH to 100 MPH and no limp mode. But when I did a few high speed runs to 120 and 130 MPH and backed off the gas the car went into limp mode again. Once again no codes and car runs fine and builds boost all the way to 120 and 130 MPH this only happens on high speed runs which I do once in a blue moon. I don't want to replace both solenoids and the limp mode doesn't go away. Not sure what else to do....??

[Jeff@TopGearSolutions]

Originally Posted by GTstunna612

Well lastnight I took out both of the VANOS solenoids and cleaned them with brake cleaner and compressed air and put them both back in there original locations. Both of the solenoids looked clean no gunk or buildup on them. Test drove the car it feels more responsive. Did a few hard pulls from 30, and 40 MPH to 100 MPH and no limp mode. But when I did a few high speed runs to 120 and 130 MPH and backed off the gas the car went into limp mode again. Once again no codes and car runs fine and builds boost all the way to 120 and 130 MPH this only happens on high speed runs which I do once in a blue moon. I don't want to replace both solenoids and the limp mode doesn't go away. Not sure what else to do....??

I would suggest getting a hold of a BMW diagnostic tool or BT tool.

You MUST have codes. Tuners can't read all the codes though so you may have shadow codes that can only be read by true BMW diagnostic tools.

No sense in us guessing unless you just want to blindly start spending money.

Could be any of the following:
Coil Packs
Vanos Solenoids
Injectors
Fuel Pumps
Carbon Build Up Intake Valves

[RandyFL73]

I cleaned my vanos solenoids and swapped them...no issues. They are the same part number for both.

[GTstunna612]

so I increased the "boost fail safe" on the jb4 settings from 17 to 18.5 and the limp has gone away when I was in map 1...will have to continue to monitor see if it comes back

[ThaiRacer]

I'm having same issues with similar codes, I have new coils and spark plugs.

2FD2 9F42 9F52