Injector Issue... Maybe?

HeyKC · 05-13-2020, 07:45 AM

Long story short: How do I know if I have a bad injector with no codes?

2014 40K on the clock. Mods included high flow drop in filters and OFT v2.0 stage 1 93 tune.
New NGK plugs and Bosch coils.

Shortest version of the long story: Went and did one of those cruises through neighborhoods for kids so this was a lot of slow stop and go traffic. (I read this is not the best on colder plugs)
On the way home I decided to get on it a little bit and the car seemed to studded but power seemed to come on fine so I didn't think too much of it at first. Car also drove home with no issues.
Skip to a couple of hours later I went to run an errand and the car was running funny. No codes and the car was actually driving fine but I could tell something was off. Pulled over in a parking lot to check it out and gave it a couple of revs then BAM! DTM error. Grabbed the scan tool from the trunk showed misfire on cyl 3. Cleared it and re-started the car. Code came right back. I was upset and confused having just replaced plugs and coils. Did a little research and saw that the slow cruising was not great on colder plugs. Ordered a new plug and put it in. Also put on one of the original coils just in case the new coil was junk. Yay! No DTM or miss fire code! Not so yay... Also the car is back to running "funny". I can start it and tell there is still a miss. I have only driven it around the block since. It drove around fine but I know its not right. Preceded to bang my head against a wall then started digging through the forums before throwing coils and plugs at it. Obviously miss fire codes usually pop up due to plugs or coils.
Do they ever come up due to an injector issue in our cars? I have read there is usually a more fuel related code. I read there is an extended warranty on these. Will BMW replace them with out a code? Can I verify it is an injector with out a code? Is there something else I should be looking at?
Thank you for any input.

M5Rick · 05-13-2020, 09:36 AM

[QUOTE=HeyKC;26170344]Long story short: How do I know if I have a bad injector with no codes?

2014 40K on the clock. Mods included high flow drop in filters and OFT v2.0 stage 1 93 tune.
New NGK plugs and Bosch coils.

Shortest version of the long story: Went and did one of those cruises through neighborhoods for kids so this was a lot of slow stop and go traffic. (I read this is not the best on colder plugs)
On the way home I decided to get on it a little bit and the car seemed to studded but power seemed to come on fine so I didn't think too much of it at first. Car also drove home with no issues.
Skip to a couple of hours later I went to run an errand and the car was running funny. No codes and the car was actually driving fine but I could tell something was off. Pulled over in a parking lot to check it out and gave it a couple of revs then BAM! DTM error. Grabbed the scan tool from the trunk showed misfire on cyl 3. Cleared it and re-started the car. Code came right back. I was upset and confused having just replaced plugs and coils. Did a little research and saw that the slow cruising was not great on colder plugs. Ordered a new plug and put it in. Also put on one of the original coils just in case the new coil was junk. Yay! No DTM or miss fire code! Not so yay... Also the car is back to running "funny". I can start it and tell there is still a miss. I have only driven it around the block since. It drove around fine but I know its not right. Preceded to bang my head against a wall then started digging through the forums before throwing coils and plugs at it. Obviously miss fire codes usually pop up due to plugs or coils.
Do they ever come up due to an injector issue in our cars? I have read there is usually a more fuel related code. I read there is an extended warranty on these. Will BMW replace them with out a code? Can I verify it is an injector with out a code? Is there something else I should be looking at?
Thank you for any input.[/QUOT

*If it was running fine before then unlikely to be injectors. A problem a few have had is that when changing out the plugs the locking clips onto the coils can be a hit or miss affair and if not clipped on right can cause the bad running you describe. You sure you got the correct plugs,(note you have ngk? and not bosch) and right gaps on them.

HeyKC · 05-13-2020, 10:16 AM

Quote:

Originally Posted by M5theonlyone

*If it was running fine before then unlikely to be injectors. A problem a few have had is that when changing out the plugs the locking clips onto the coils can be a hit or miss affair and if not clipped on right can cause the bad running you describe. You sure you got the correct plugs,(note you have ngk? and not bosch) and right gaps on them.

Car had stock plugs then I put the tune on. Car would go into DTM at WOT. But this would clear out and the car would act and drive normal unless it was WOT. I ordered the NGK based on what people recommend for tuned cars and gaped them at 020. The car was running well and strong with then new plugs and the tune. I agree it was not perfect. At the top of the rev range there was a noticeable power drop but nothing that seemed way out of the way. Although that is another reason I started this thread thinking that power drop was lack of fuel up top...?

I have flashed the car back to the stock tune and have considered ordering a set of Bosch to put in the car to see how it reacts. Just a little frustrated with the in and out of the plugs and coils at the moment. If that is the recommendation that will be the route I take.

B1M3 · 05-25-2020, 01:01 PM

what coils did you buy Genuine BMW or OEM Bosch, online bmw store or ebay / amazon?

B1M3 · 05-25-2020, 01:04 PM

I had similar issue on WOT with 535i, ended up with bad chinese knockoffs coils.

AisteLau · 08-13-2020, 03:43 AM

Kit includes:
8x BOSCH 0261500262 RP injector EU6
8x BMW 13537577649 Decoupling element
8x BOSCH 0242145541 High Power Spark Plug
8x BOSCH 0221504470 Direct Ignition Coil
2x BOSCH 0258017187 Upstream Oxygen Sensor

Can also be sold in separate parts.

Price: 1015EUR (1197USD) including VAT, excluding shipment.
VAT invoice available
All in stock. Shipped next day.

All 100% GENUINE
Seller - company
Payment - PayPal

Got my own '15 M5 with CP with 50K on clock last February.
Got this replaced on my own car - the power increase was enormous and no drivetrain errors since then.

HeyKC · 08-14-2020, 09:22 AM

Well after being upset with the car and focusing on house items it looks like the issue is from cylinder 3. Although I dont think it is an injector issue any more. Looks like I am getting blow by on cyl 3 causing the plug to fire improperly. Maybe it is something else but that was my first thought when seeing the oil on the plug.

13M5F10 · 08-14-2020, 09:42 AM

Quote:

Originally Posted by HeyKC

Well after being upset with the car and focusing on house items it looks like the issue is from cylinder 3. Although I dont think it is an injector issue any more. Looks like I am getting blow by on cyl 3 causing the plug to fire improperly. Maybe it is something else but that was my first thought when seeing the oil on the plug.

My buddy had a similar issue with his comp 2014. It was the injectors.

We both ran colder NGK plugs without issues. Cruising wasn't an issue.

AnotherM · 04-26-2021, 06:24 PM

Quote:

Originally Posted by HeyKC

Well after being upset with the car and focusing on house items it looks like the issue is from cylinder 3. Although I dont think it is an injector issue any more. Looks like I am getting blow by on cyl 3 causing the plug to fire improperly. Maybe it is something else but that was my first thought when seeing the oil on the plug.

What did the plug look like when you pulled it?

If you had a leaking injector, it would be wet and would smell like gas. It would also be black from poor combustion.

A leaking injector can cause a misfire at startup or cause misfires whil driving, but it should be very noticable. If you turn off cylinder 3 injector with your scanner does the idle change at all? If it is bad, you would likely not see a change.

Typically, whenever you do any work and than run into a not previously experienced issue, it is related.

The first thing to do is turn off the injector with your scanner and inspect the origonal plug. Next, move the plug and coil to another cylinder and watch the misfire counter. Did it move cylinders? If so, you have your answer, if not. You know it is likely the injector.

Boosted M5 · 04-27-2021, 11:20 PM

If you had this issue after coil and spark plug change then it's something in your install or parts acquired. I would also revert to stock tune to eliminate the chance that it may be tune related.

HeyKC · 05-17-2021, 01:21 PM

Follow up. I was getting piston blow by.
Took some to get a good build up of oil on the spark plug but it was noticeable. Getting rebuilt.

AHall · 05-18-2021, 06:34 AM

Quote:

Originally Posted by HeyKC

Follow up. I was getting piston blow by.
Took some to get a good build up of oil on the spark plug but it was noticeable. Getting rebuilt.

What is the estimated cost for the rebuild?

05-13-2020, 07:45 AM	#1
HeyKC Private First Class 102 Rep 187 Posts Drives: BMW M6 CP Join Date: Jun 2019 Location: KCMO iTrader: (0)	Injector Issue... Maybe? Long story short: How do I know if I have a bad injector with no codes? 2014 40K on the clock. Mods included high flow drop in filters and OFT v2.0 stage 1 93 tune. New NGK plugs and Bosch coils. Shortest version of the long story: Went and did one of those cruises through neighborhoods for kids so this was a lot of slow stop and go traffic. (I read this is not the best on colder plugs) On the way home I decided to get on it a little bit and the car seemed to studded but power seemed to come on fine so I didn't think too much of it at first. Car also drove home with no issues. Skip to a couple of hours later I went to run an errand and the car was running funny. No codes and the car was actually driving fine but I could tell something was off. Pulled over in a parking lot to check it out and gave it a couple of revs then BAM! DTM error. Grabbed the scan tool from the trunk showed misfire on cyl 3. Cleared it and re-started the car. Code came right back. I was upset and confused having just replaced plugs and coils. Did a little research and saw that the slow cruising was not great on colder plugs. Ordered a new plug and put it in. Also put on one of the original coils just in case the new coil was junk. Yay! No DTM or miss fire code! Not so yay... Also the car is back to running "funny". I can start it and tell there is still a miss. I have only driven it around the block since. It drove around fine but I know its not right. Preceded to bang my head against a wall then started digging through the forums before throwing coils and plugs at it. Obviously miss fire codes usually pop up due to plugs or coils. Do they ever come up due to an injector issue in our cars? I have read there is usually a more fuel related code. I read there is an extended warranty on these. Will BMW replace them with out a code? Can I verify it is an injector with out a code? Is there something else I should be looking at? Thank you for any input.
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05-13-2020, 09:36 AM	#2
M5Rick General 59590 Rep 19,435 Posts Drives: M5 F10 DCT Gunmetal Join Date: Aug 2018 Location: Southern England iTrader: (0)	[QUOTE=HeyKC;26170344]Long story short: How do I know if I have a bad injector with no codes? 2014 40K on the clock. Mods included high flow drop in filters and OFT v2.0 stage 1 93 tune. New NGK plugs and Bosch coils. Shortest version of the long story: Went and did one of those cruises through neighborhoods for kids so this was a lot of slow stop and go traffic. (I read this is not the best on colder plugs) On the way home I decided to get on it a little bit and the car seemed to studded but power seemed to come on fine so I didn't think too much of it at first. Car also drove home with no issues. Skip to a couple of hours later I went to run an errand and the car was running funny. No codes and the car was actually driving fine but I could tell something was off. Pulled over in a parking lot to check it out and gave it a couple of revs then BAM! DTM error. Grabbed the scan tool from the trunk showed misfire on cyl 3. Cleared it and re-started the car. Code came right back. I was upset and confused having just replaced plugs and coils. Did a little research and saw that the slow cruising was not great on colder plugs. Ordered a new plug and put it in. Also put on one of the original coils just in case the new coil was junk. Yay! No DTM or miss fire code! Not so yay... Also the car is back to running "funny". I can start it and tell there is still a miss. I have only driven it around the block since. It drove around fine but I know its not right. Preceded to bang my head against a wall then started digging through the forums before throwing coils and plugs at it. Obviously miss fire codes usually pop up due to plugs or coils. Do they ever come up due to an injector issue in our cars? I have read there is usually a more fuel related code. I read there is an extended warranty on these. Will BMW replace them with out a code? Can I verify it is an injector with out a code? Is there something else I should be looking at? Thank you for any input.[/QUOT *If it was running fine before then unlikely to be injectors. A problem a few have had is that when changing out the plugs the locking clips onto the coils can be a hit or miss affair and if not clipped on right can cause the bad running you describe. You sure you got the correct plugs,(note you have ngk? and not bosch) and right gaps on them.
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05-25-2020, 01:01 PM	#4
B1M3 Neon Garden 85 Rep 402 Posts Drives: BMW X5M Comp Join Date: Oct 2014 Location: Sin City Nevada iTrader: (6)	what coils did you buy Genuine BMW or OEM Bosch, online bmw store or ebay / amazon?
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05-25-2020, 01:04 PM	#5
B1M3 Neon Garden 85 Rep 402 Posts Drives: BMW X5M Comp Join Date: Oct 2014 Location: Sin City Nevada iTrader: (6)	I had similar issue on WOT with 535i, ended up with bad chinese knockoffs coils.
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08-13-2020, 03:43 AM	#6
AisteLau New Member 4 Rep 7 Posts Drives: BMW M5 M6 Join Date: Aug 2020 Location: Vilnius, Lithuania iTrader: (0)	BMW M5 / M6 BOSCH EU6 injection/ignition service MEGA KIT Kit includes: 8x BOSCH 0261500262 RP injector EU6 8x BMW 13537577649 Decoupling element 8x BOSCH 0242145541 High Power Spark Plug 8x BOSCH 0221504470 Direct Ignition Coil 2x BOSCH 0258017187 Upstream Oxygen Sensor Can also be sold in separate parts. Price: 1015EUR (1197USD) including VAT, excluding shipment. VAT invoice available All in stock. Shipped next day. All 100% GENUINE Seller - company Payment - PayPal Got my own '15 M5 with CP with 50K on clock last February. Got this replaced on my own car - the power increase was enormous and no drivetrain errors since then.
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08-14-2020, 09:22 AM	#7
HeyKC Private First Class 102 Rep 187 Posts Drives: BMW M6 CP Join Date: Jun 2019 Location: KCMO iTrader: (0)	Well after being upset with the car and focusing on house items it looks like the issue is from cylinder 3. Although I dont think it is an injector issue any more. Looks like I am getting blow by on cyl 3 causing the plug to fire improperly. Maybe it is something else but that was my first thought when seeing the oil on the plug.
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04-27-2021, 11:20 PM	#10
Boosted M5 Private First Class 69 Rep 193 Posts Drives: F10 m5 Join Date: Dec 2018 Location: Sf bay area iTrader: (0)	If you had this issue after coil and spark plug change then it's something in your install or parts acquired. I would also revert to stock tune to eliminate the chance that it may be tune related.
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05-17-2021, 01:21 PM	#11
HeyKC Private First Class 102 Rep 187 Posts Drives: BMW M6 CP Join Date: Jun 2019 Location: KCMO iTrader: (0)	Follow up. I was getting piston blow by. Took some to get a good build up of oil on the spark plug but it was noticeable. Getting rebuilt.
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