Consensus on fuel injectors?

spammysammich · 07-18-2022, 11:04 AM

Quote:

Originally Posted by chenium

I'm going to save my original injectors and have them cleaned as a backup

Please be advised that no amount of cleaning will restore any internal components of the solenoid valve that have been corroded or damaged by the ethanol in modern gas. The Porsche community has been plagued by this (among other factors) for years with bore scoring and many other platforms experience fuel system problems with higher ethanol content.

A tech I know says fuel injector problems are very common on S85 engines so it is no surprise that has trickled down to ours. Wild guess on my part but I often wonder what the effect of ethanol in our fuel systems has in conjunction with the use of the cars. Do garage queens suffer more from injector failure than daily driven cars? Is long term ethanol soaking degrading fuel lines/o-rings that perhaps weren't specified for long term high ethanol content fuel? I'd like to think M engineers were more pragmatic than that.

Apples to oranges comparison but I have an 08 STI with the original injectors/coils fuel pump that I daily drive in nearly bone stock form with no added boost and have yet to experience any fuel related problems over 168K miles. But I know e85 turns the fuel lines to mush on Subarus of that vintage. My injectors on the M3 were replaced 6K miles ago to troubleshoot some hesitation issues that were actually x-pipe related according to the previous owner. So I have a little peace of mind for now but, as a weekend car I worry way more about the M.

aus · 08-10-2022, 05:07 PM

So cleaning my injectors was $40 each. Not really worth it, but it's done.
The shops cost for new ones is $50+ each.
.

x3sm · 08-12-2022, 11:02 PM

what about getting originals rebuilt? I seen places that have 1-day turnaround

spammysammich · 08-12-2022, 11:37 PM

Quote:

Originally Posted by x3sm

what about getting originals rebuilt? I seen places that have 1-day turnaround

Nobody truly "rebuilds" fuel injectors. They ultrasonically clean them in solvent and slap new o-rings on.

x3sm · 08-13-2022, 03:57 PM

Quote:

Originally Posted by spammysammich

Nobody truly "rebuilds" fuel injectors. They ultrasonically clean them in solvent and slap new o-rings on.

True. I inquired from a few companies online and they mainly just clean them and change o-rings, but they claim there are no parts available for a real rebuild.

valve float · 08-13-2022, 04:12 PM

anyone know if the AFI set @550$ requires ECU programming or pnp...?

i emailed last week but nothing back....

sxychubles · 06-08-2026, 06:38 PM

Bringing this back. So.... Prices have risen drastically. Oem is around 3k and Bosch ones are 457 on fcp. I can only assume the oem ones are made by Bosch. Can someone confirm?

THRSTYM3 · 06-09-2026, 07:04 AM

Quote:

Originally Posted by sxychubles

Bringing this back. So.... Prices have risen drastically. Oem is around 3k and Bosch ones are 457 on fcp. I can only assume the oem ones are made by Bosch. Can someone confirm?

pretty sure... regardless i have 10k miles on the bosch from fcp

PapaMurph · 06-09-2026, 08:34 AM

I just bit the bullet and bought a new set of FCP euro. Now I can sleep easy

sxychubles · 06-15-2026, 03:51 AM

Oem or the Bosch ones?

PapaMurph · 06-15-2026, 09:38 AM

Quote:

Originally Posted by sxychubles

Oem or the Bosch ones?

Bosch kit on FCP euro

Assimilator1 · 06-19-2026, 04:45 AM

Quote:

Originally Posted by sxychubles

Bringing this back. So.... Prices have risen drastically. Oem is around 3k and Bosch ones are 457 on fcp. I can only assume the oem ones are made by Bosch. Can someone confirm?

Yes I believe so, I've still got the old injectors from my car, so I'll have a look next week and take a photo.

Assimilator1 · 06-24-2026, 07:41 AM

Quote:

Originally Posted by sxychubles

Bringing this back. So.... Prices have risen drastically. Oem is around 3k and Bosch ones are 457 on fcp. I can only assume the oem ones are made by Bosch. Can someone confirm?

Confirmed, this is one of my original injectors.
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DrFerry · 06-25-2026, 03:36 PM

Quote:

Originally Posted by sxychubles

Bringing this back. So.... Prices have risen drastically. Oem is around 3k and Bosch ones are 457 on fcp. I can only assume the oem ones are made by Bosch. Can someone confirm?

Yes, the S65 OEM injectors are made by BOSCH.

08-10-2022, 05:07 PM	#24
aus Major General 1029 Rep 9,093 Posts Drives: Odysse Join Date: Jul 2005 Location: Seal Beach, CA iTrader: (10)	So cleaning my injectors was $40 each. Not really worth it, but it's done. The shops cost for new ones is $50+ each. . __________________ Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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08-12-2022, 11:02 PM	#25
x3sm Captain 399 Rep 806 Posts Drives: The twisties Join Date: May 2018 Location: AVL iTrader: (0)	what about getting originals rebuilt? I seen places that have 1-day turnaround __________________ CURRENT: BMW X7 40i / 911 997.2 / 958 CAYENNE TURBO SOLD: PANAMERA 4 / CAYENNE S / M3 E93 / PORSCHE MACAN S / BMW X3 F25 / AUDI S4 B8 / BMW E92 335
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08-13-2022, 04:12 PM	#28
valve float Private First Class 179 Rep 143 Posts Drives: B6 A4 Avant 6sp, E90 M3 G1 6sp Join Date: Sep 2017 Location: BC - Canada iTrader: (0)	anyone know if the AFI set @550$ requires ECU programming or pnp...? i emailed last week but nothing back....
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06-08-2026, 06:38 PM	#29
sxychubles Second Lieutenant 84 Rep 212 Posts Drives: Dravit G82 6MT, Silverstone E90 M3 6MT Join Date: May 2021 Location: Boston iTrader: (0)	Bringing this back. So.... Prices have risen drastically. Oem is around 3k and Bosch ones are 457 on fcp. I can only assume the oem ones are made by Bosch. Can someone confirm?
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06-09-2026, 08:34 AM	#31
PapaMurph First Lieutenant 287 Rep 348 Posts Drives: 2009 E90 M3 DCT Join Date: Mar 2023 Location: Atlanta iTrader: (0)	I just bit the bullet and bought a new set of FCP euro. Now I can sleep easy
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06-15-2026, 03:51 AM	#32
sxychubles Second Lieutenant 84 Rep 212 Posts Drives: Dravit G82 6MT, Silverstone E90 M3 6MT Join Date: May 2021 Location: Boston iTrader: (0)	Oem or the Bosch ones? Last edited by sxychubles; 06-15-2026 at 09:16 AM..
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