[David 12]

Same thing happened with me eunosracr - The new plugs solved the misfire issue.

[eunosracr]

Originally Posted by David 12

Same thing happened with me eunosracr - The new plugs solved the misfire issue.

Thank you sir. Let me try that first before taking off all my mods and taking her in!

[cstmx_ryder]

Originally Posted by eunosracr

I have gotten 3 limp modes upon cold starts in the past week. I pulled the codes and got cylinders 4 & 6 misfiring. Sounds like i should get new plugs first huh? I have 23k miles with the original plugs. Running tuned for 20k miles.

I just changed my plugs 5 months ago......they should still be good.

Originally Posted by David 12

Same thing happened with me eunosracr - The new plugs solved the misfire issue.

When was the last time that you changed your plugs?

TIA

[David 12]

I changed them at about 22k miles and I am now at 31k. Modded for all but about the first 5k miles.

[Asclepius]

Im getting misfires on cylinders 5 and 6. Im schedule for Monday to fix the prob. Ill let you know what happens.

[edo]

Originally Posted by Asclepius

Im getting misfires on cylinders 5 and 6.

Same here... And sometimes cylinder 4.

[Former_Boosted_IS]

Since this thread seems to be blowing up, lets go over a few things. If your misfire is at high rpms (the BT code will list the rpms), then it is more than likely ignition related. First and easiest would be to swap coil packs on the misfiring cylinder with a coil pack on a cylinder that is not misfiring. Write down what coil packs you swapped. If the misfired jumps to the new cylinder then you know it is the coil pack. If the misfire remains in the same cylinder, then go on and just change spark plugs. If that doesn't fix it, then it may be injectors or other things many will not be able to DIY fix.

If the misfire is at low rpms or idle, then check the codes. If it is only a misfire, then you can use the above method. If there are fuel pump codes too, then it is more than likely your HPFP going out.

[eunosracr]

Originally Posted by Former_Boosted_IS

Since this thread seems to be blowing up, lets go over a few things. If your misfire is at high rpms (the BT code will list the rpms), then it is more than likely ignition related. First and easiest would be to swap coil packs on the misfiring cylinder with a coil pack on a cylinder that is not misfiring. Write down what coil packs you swapped. If the misfired jumps to the new cylinder then you know it is the coil pack. If the misfire remains in the same cylinder, then go on and just change spark plugs. If that doesn't fix it, then it may be injectors or other things many will not be able to DIY fix.

If the misfire is at low rpms or idle, then check the codes. If it is only a misfire, then you can use the above method. If there are fuel pump codes too, then it is more than likely your HPFP going out.

Former Boosted IS: My misfire only happens as soon as I start the car when cold. If I shut it off and turn it back on the limp mode goes away. However, the codes still read misfire on cylinders 5 & 6. Should I try to swap the plugs out first as mentioned above by David 12? I have yet to get a misfire while driving hard. Thanks everyone. This thread does seem to be growing by the day.

[cstmx_ryder]

Originally Posted by Former_Boosted_IS

Since this thread seems to be blowing up, lets go over a few things. If your misfire is at high rpms (the BT code will list the rpms), then it is more than likely ignition related. First and easiest would be to swap coil packs on the misfiring cylinder with a coil pack on a cylinder that is not misfiring. Write down what coil packs you swapped. If the misfired jumps to the new cylinder then you know it is the coil pack. If the misfire remains in the same cylinder, then go on and just change spark plugs. If that doesn't fix it, then it may be injectors or other things many will not be able to DIY fix.

If the misfire is at low rpms or idle, then check the codes. If it is only a misfire, then you can use the above method. If there are fuel pump codes too, then it is more than likely your HPFP going out.

I've gotten misfires at my dyno day before.......But that was solved by fresh plugs. Now the misfire and engine malfunction light comes on on cold-starts. Even went as far as swapping the coils from cylinder 2 to 1, and 3 to 4. No luck there, so I'm scheduled to bring my car in ASAP.........We'll see how that goes, keep you guys posted.

Originally Posted by eunosracr

Former Boosted IS: My misfire only happens as soon as I start the car when cold. If I shut it off and turn it back on the limp mode goes away. However, the codes still read misfire on cylinders 5 & 6. Should I try to swap the plugs out first as mentioned above by David 12? I have yet to get a misfire while driving hard. Thanks everyone. This thread does seem to be growing by the day.

+1, but now my car seems to have the shakes too upon cold-starts. Please be the injectors, please be the injectors, please be the injectors.........LOL

[eunosracr]

Originally Posted by cstmx_ryder

I've gotten misfires at my dyno day before.......But that was solved by fresh plugs. Now the misfire and engine malfunction light comes on on cold-starts. Even went as far as swapping the coils from cylinder 2 to 1, and 3 to 4. No luck there, so I'm scheduled to bring my car in ASAP.........We'll see how that goes, keep you guys posted.


+1, but now my car seems to have the shakes too upon cold-starts. Please be the injectors, please be the injectors, please be the injectors.........LOL

When are you taking her in? Please keep us posted!

[cstmx_ryder]

Just took her in today.

Got a 135i vert for a loaner car, with BMW Perf brakes n I think exhaust too!

[goodstuff448]

I just got my car back from the dealer for the exact same problem today. It was the injectors!!

Originally Posted by cstmx_ryder

I've gotten misfires at my dyno day before.......But that was solved by fresh plugs. Now the misfire and engine malfunction light comes on on cold-starts. Even went as far as swapping the coils from cylinder 2 to 1, and 3 to 4. No luck there, so I'm scheduled to bring my car in ASAP.........We'll see how that goes, keep you guys posted.


+1, but now my car seems to have the shakes too upon cold-starts. Please be the injectors, please be the injectors, please be the injectors.........LOL

[edo]

So, I called bmw dealership and asked about my misfires.

They told, that the reasons could be:

• spark plugs (I changed them some time ago, just 1000 miles driven)
• coils - most likely
• injectors

.

When HPFP fails, a car starts roughly and my car starts normally.

I also asked which cylinder is which.

Cylinder No. 6 is the closest to cabin, firewall; cylinder No. 1 is the closest to the front bumper.

[cstmx_ryder]

Originally Posted by edo

So, I called bmw dealership and asked about my misfires.

They told, that the reasons could be:

• spark plugs (I changed them some time ago, just 1000 miles driven)
• coils - most likely
• injectors

.

When HPFP fails, a car starts roughly and my car starts normally.

I also asked which cylinder is which.

Cylinder No. 6 is the closest to cabin, firewall; cylinder No. 1 is the closest to the front bumper.

Have you tried switching the coils prior to bringing it into the dealership?

So it is verified which way to count the cylinders, good job!

I should be getting a call from the dealership by the end of today. We'll see if it's the injectors or something else!

[edo]

Originally Posted by cstmx_ryder

Have you tried switching the coils prior to bringing it into the dealership?

Who said I've brought it to dealership?

Switching coils is what I'm going to do this weekend, hopefully.

[645Nm]

cstmx_ryder

I am glad the issues are being resolved. Did you have to remove mods before taking car in?

I know it is frustrating to sit without a car. let us know the final outcome.

[cstmx_ryder]

645Nm,

ya, I'm hoping it's the injectors. thanks

[BMOEW]

I just got a call from the dealer, and my car was reading low fuel pressure and cylinder 5 misfire, and they told me they r gonna be replacing an injector.

[BMOEW]

just got the car back from the deal they replaced the injector, it is running amazing installed JB3 with no problems

[645Nm]

Great news!!!!

Give it time to settle...before raising the JB3 boost too high...

[edo]

Originally Posted by BMOEW

just got the car back from the deal they replaced the injector, it is running amazing installed JB3 with no problems

Do you know the part number of the injector?

[cstmx_ryder]

Just got my car back as well, replaced all injectors and now it's running strong. Glad it was just the injectors.......