Engine shaking under high boost

jwalker87 · 07-01-2013, 01:46 PM

Hey guys,

I'm making this thread mainly to document a problem for others who may have it, and also to see if anyone else has experienced the same thing.

About 2 years ago, my car started shaking violently if I floored it (it was bone stock). It threw a code for Cylinder 4 Misfire. After a LONG time of troubleshooting and getting nowhere, I broke down and replaced all the spark plugs, ignition coils, and 4 of the 6 injectors (I got a good deal on 4...). Turns out the metal mounting tab on Injector #4 was broken off! Recoded for the injectors and all was well.

Until last weekend. I now have JB4 on map 5, and on a road trip started having the same issue suddenly one time I floored it, but this time had codes P3090 and P112F. Not being a fool, I took off the engine cover, and sure enough; there was a little metal tab sitting on top of the engine, from Injector #5 (I didn't replace 5 or 6). So I overnighted some replacements and replaced #5 and #6, and the problem is gone!

Has anyone else had the issue of these injectors' tabs breaking off? I'm assuming they then did not seat correctly and bad stuff would happen under high cylinder pressure, but that's just a theory. I know that replacing them fixed it...

I know nothing like this came up when I searched for it, so I wanted something to be here documenting this problem for others. Hopefully that helps!

Jeff@TopGearSolutions · 07-01-2013, 03:35 PM

I recall someone making a thread recently and wondering what a small metal tab was.... it was the injectors tab by no accident. It seems to becoming increasingly common.

Thread was called "What is this" (or something like that). A title that is not helpful to the community. Let this be a lesson for people making threads to make your thread searchable so others can learn

jwalker87 · 07-01-2013, 10:30 PM

Yeah, I was shocked when it happened to me AGAIN a year after replacing 4 of the injectors. With those odds, I'm amazed it isn't a more commonly discussed issue.

Luckily I was able to pick up some of the older -261 p/n injectors, so I didn't have to replace all 6 with BMW's fancy new "incompatible" injectors.

jwalker87 · 07-02-2013, 12:13 PM

Luckily it's VERY easy to diagnose. Remove engine cover. Do you see a little metal tab sitting next to an injector?

07-01-2013, 01:46 PM	#1
jwalker87 Major 331 Rep 1,031 Posts Drives: '08 335i, '11 335xi, '01 Z3M Join Date: Jul 2010 Location: Pittsburgh, PA iTrader: (2)	Engine shaking under high boost Hey guys, I'm making this thread mainly to document a problem for others who may have it, and also to see if anyone else has experienced the same thing. About 2 years ago, my car started shaking violently if I floored it (it was bone stock). It threw a code for Cylinder 4 Misfire. After a LONG time of troubleshooting and getting nowhere, I broke down and replaced all the spark plugs, ignition coils, and 4 of the 6 injectors (I got a good deal on 4...). Turns out the metal mounting tab on Injector #4 was broken off! Recoded for the injectors and all was well. Until last weekend. I now have JB4 on map 5, and on a road trip started having the same issue suddenly one time I floored it, but this time had codes P3090 and P112F. Not being a fool, I took off the engine cover, and sure enough; there was a little metal tab sitting on top of the engine, from Injector #5 (I didn't replace 5 or 6). So I overnighted some replacements and replaced #5 and #6, and the problem is gone! Has anyone else had the issue of these injectors' tabs breaking off? I'm assuming they then did not seat correctly and bad stuff would happen under high cylinder pressure, but that's just a theory. I know that replacing them fixed it... I know nothing like this came up when I searched for it, so I wanted something to be here documenting this problem for others. Hopefully that helps! __________________ 2001 e36/7 M Roadster 5spd 2008 e90 335i 6spd 2011 e90 335xi 6spd 2011 e70 x5 diesel 2010 Ducati Monster 696
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07-01-2013, 03:35 PM	#2
Jeff@TopGearSolutions 3461 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	I recall someone making a thread recently and wondering what a small metal tab was.... it was the injectors tab by no accident. It seems to becoming increasingly common. Thread was called "What is this" (or something like that). A title that is not helpful to the community. Let this be a lesson for people making threads to make your thread searchable so others can learn
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07-01-2013, 10:30 PM	#3
jwalker87 Major 331 Rep 1,031 Posts Drives: '08 335i, '11 335xi, '01 Z3M Join Date: Jul 2010 Location: Pittsburgh, PA iTrader: (2)	Yeah, I was shocked when it happened to me AGAIN a year after replacing 4 of the injectors. With those odds, I'm amazed it isn't a more commonly discussed issue. Luckily I was able to pick up some of the older -261 p/n injectors, so I didn't have to replace all 6 with BMW's fancy new "incompatible" injectors. __________________ 2001 e36/7 M Roadster 5spd 2008 e90 335i 6spd 2011 e90 335xi 6spd 2011 e70 x5 diesel 2010 Ducati Monster 696
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07-02-2013, 12:13 PM	#4
jwalker87 Major 331 Rep 1,031 Posts Drives: '08 335i, '11 335xi, '01 Z3M Join Date: Jul 2010 Location: Pittsburgh, PA iTrader: (2)	Luckily it's VERY easy to diagnose. Remove engine cover. Do you see a little metal tab sitting next to an injector? __________________ 2001 e36/7 M Roadster 5spd 2008 e90 335i 6spd 2011 e90 335xi 6spd 2011 e70 x5 diesel 2010 Ducati Monster 696
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