Low on power, shaky idle and P0420 and P0430

[epiphanyray]

Ok guys, looking for a few opinions... Car is a 2013 M5 54000 miles, Catless DP, Mission Performance tune, SSP clutch.

Car has been running just fine for a while now, and about 10 days ago I went to do some runs on a hot day. Suddenly i got a DTMAL error, shut the car off, and back on and car has never been the same. I did a few runs a couple days later to really log how poor the car was performing and PUFF, misfires, and puffs of smoke came out the tail pipe.

Took the car to the shop, and they diagnosed it as a bad fuel injector because you could really smell the GASOLINE coming out of the exhaust. Took out the spark plugs and saw one of them was soaking wet with Gasoline. Took out injectors and saw that they were stuck open. You could literally blow air through them. Changed two injectors in Cylinder 5 and 6. and Finally got the car started. No smoke, and car was back... (sort of).

no smoke, but the power is definitely not there. RAN TORQUE app and looked up errors. I SEE P0420 and P0430 errors. Idle is really shaky, and very little boost once i go WOT at around 2800+ RPM.

I cleaned MAFS this evening, and car still stutters on idle. Idle RPM is around 750-800rpm and just shakes the car in this range.

All 4 o2 sensors have been replaced, and I will replace all 8 spark plugs and Coils tomorrow to see if thats it.

Can a bad coil cause such crappy performance? I dont get any other errors. just p0420 and p0430.

thoughts?

[epiphanyray]

Im wondering if this has anything to do with my Catless DP. I also have my old STOCK catted downpipes if anyone recommends me slapping them on there to test.

[Jasoneo5]

Let me know how the coil change goes. I had a rough idle but it was due to misfires on a particular cylinder. Swapped the plugs and coils and problem is solved....for now

[BPMSport]

For starters, P0430 and P0420 are cat efficiency faults - which you shouldn't have running software designed for catless exhaust systems.

Probably best to log and get some concrete data as to what may be causing the issues.

Putting the stock downpipes back on would certainly prevent the P0430 and P0420 faults from being triggered again, but would not do anything to solve the poor running condition.

Also, make sure that the injectors you replaced are the same variant that you removed, and that the injector calibration values have been coded to the DME.

[epiphanyray]

Originally Posted by BPMSport

For starters, P0430 and P0420 are cat efficiency faults - which you shouldn't have running software designed for catless exhaust systems.

Probably best to log and get some concrete data as to what may be causing the issues.

Putting the stock downpipes back on would certainly prevent the P0430 and P0420 faults from being triggered again, but would not do anything to solve the poor running condition.

Also, make sure that the injectors you replaced are the same variant that you removed, and that the injector calibration values have been coded to the DME.

As always, thanks for the guidance.

Would those two codes be triggered by me running OEM STOCK TUNE and have Catless Downpipes?

Regarding the injectors, to be honest, I simply went to REALOEM and looked up injector part numbers. Luckily my dealer had them in stock and I purchased two of them. I installed and did no calibration as I would think the would be a plug n play solution.

I just dropped off the car at my shop and will have 8 new spark plugs and coils in a few hours. NGK plugs gapped to .019.

[allmotor_2000]

Originally Posted by epiphanyray

As always, thanks for the guidance.

Would those two codes be triggered by me running OEM STOCK TUNE and have Catless Downpipes?

Regarding the injectors, to be honest, I simply went to REALOEM and looked up injector part numbers. Luckily my dealer had them in stock and I purchased two of them. I installed and did no calibration as I would think the would be a plug n play solution.

I just dropped off the car at my shop and will have 8 new spark plugs and coils in a few hours. NGK plugs gapped to .019.

You have to code the injector to the DME via ISTA or equivalent software.

[epiphanyray]

Originally Posted by allmotor_2000

You have to code the injector to the DME via ISTA or equivalent software.

I was not aware of this. As soon as they are done with the spark plugs/coil pack i will get this done.

Thanks!

[allmotor_2000]

Originally Posted by epiphanyray

I was not aware of this. As soon as they are done with the spark plugs/coil pack i will get this done.

Thanks!

When they sell injectors they check against the VIN so that it should be 'close' enough. The DME can adapt but not individually for AFR... for misfires yes.

[epiphanyray]

Originally Posted by allmotor_2000

When they sell injectors they check against the VIN so that it should be 'close' enough. The DME can adapt but not individually for AFR... for misfires yes.

To be honest I went to BMW and asked them for the injectors for an F10 M5. I gave them the REALOEM part number for my car: 13538627842. They said they did not have that exact injector. However they did have another one that is compatible with the F10 M5 and several other cars. So they sold me this part number:

13537645956. Apparently it seems to be an ALTERNATE revision of the injector.

I looked it up on ECS, and it says it DOES fit. Did I do something wrong? And Should I get this injector programmed.

[allmotor_2000]

Originally Posted by epiphanyray

To be honest I went to BMW and asked them for the injectors for an F10 M5. I gave them the REALOEM part number for my car: 13538627842. They said they did not have that exact injector. However they did have another one that is compatible with the F10 M5 and several other cars. So they sold me this part number:

13537645956. Apparently it seems to be an ALTERNATE revision of the injector.

I looked it up on ECS, and it says it DOES fit. Did I do something wrong? And Should I get this injector programmed.

No harm programming it - I re-read your post... check compression

[epiphanyray]

Just got my car back. new plugs, and coils. It is currently running Stock oem TUNE. No more stuttering at idle. Car seems really slow, (compared to a stage 2 tune) but seems to be performing like OEM. I will log a few pulls in 3rd gear hoping car builds boost as DME Requests it.

Will report back. STOCK TUNE and Catless Downpipes, only error i get is P0420 and P0430. Nothing else.

[SapphireM5]

Good luck bud, hope it all works out. Next step would be compression and leakdown test. Curious for those cylinders the injectors were stuck open.

[Craze]

These are piezo injectors and flow rate is stamped on the injectors and data must be registered when replacing

[epiphanyray]

Well, I decided to replace all 8 injectors. After analyzing the CRAP that came attached to the 2 injectors I took out, I decided on moving forward with all 8. New injectors, plugs and coils. I will then follow advice and get them all "programmed" with DME. even some of the little holes were clogged with gunk and dirt.

Look at this:

[epiphanyray]

By the way, I might as well make a contribution on here....

as some of you know, I am in the Dominican Republic (a short hop to Miami Florida), and I can get these Injectors down here for about $48.00 Dollars.

ECS has them for $250.00 Each. I just bought 6 injectors for $299.52 - Taxes included.

Part number is: 13537645956.

If anyone needs any, let me know. I can hook some people up with my discount.

[apexlocator]

Thanks for the offer I may stock a set just in case....

[epiphanyray]

Originally Posted by apexlocator

Thanks for the offer I may stock a set just in case....

Excellent. When i purchased mine i believe they had 28 in stock. Let me know

[BPMSport]

You should not mix the injector variants. It will list two variants of injectors as applicable but you must use only the superseded version of the one currently in the car. If you did not do that, remove and replace it with the proper injectors. Don't program the injector values until you're sure that is correct.

Those two faults are the only ones that should appear on a catless car with a stock tune.

Looks like you're getting close to ironing this out

[epiphanyray]

Originally Posted by BPMSport

You should not mix the injector variants. It will list two variants of injectors as applicable but you must use only the superseded version of the one currently in the car. If you did not do that, remove and replace it with the proper injectors. Don't program the injector values until you're sure that is correct.

Those two faults are the only ones that should appear on a catless car with a stock tune.

Looks like you're getting close to ironing this out

Crappppp really? They are already in!!! The bmw techs will test car tomorrow. The techs at bmw said they were Ok.

Wow now i wont sleep! :

The other two that were in were working just fine.

Thoughts?

[BMWAUDIO]

That is a great deal but obviously they are getting rid of old stock that they can not use on a warranty car
bmw will not pay them for old part number when there is a newer model that replaces it
ecs shows the newer part # 13538627842

for that price you should buy all 8 and just have them all coded to work for you
as long as your car does not already have the newer ones in it you should be fine

[TheHouseWon]

Subscribing. Good luck, bro

[3rdCoastBMW]

Originally Posted by epiphanyray

Excellent. When i purchased mine i believe they had 28 in stock. Let me know

I just had 2 injectors stick open on me. How fast can you source these? I would like to replace all 8 while the car is in the shop.