How long should fuel injectors last?
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,227
Likes: 185
From: Chicago
E63 SL55 996TT C5Z06
How long should fuel injectors last?
i've got 117k miles on my 2003 c32 and trying to sort out a cylinder 1 misfire and after changing the plug, plug wire and coil pack with all new stuff the misfire has improved (CEL is gone) but definitely still there and very noticeable vibration and noise at low RPM.
am guessing this could be a bad fuel injector so maybe just replace them all at this point based on mileage i'm at...?
Any feedback on when to change these or just how long stock fuel injectors should last?
i found replacement ones here on eBay which aren't too expensive...
Bosch part =0280156072
MB part = 1120780349
http://www.ebay.com/itm/Bosch-028015...5Xd8pF&vxp=mtr
am guessing this could be a bad fuel injector so maybe just replace them all at this point based on mileage i'm at...?
Any feedback on when to change these or just how long stock fuel injectors should last?
i found replacement ones here on eBay which aren't too expensive...
Bosch part =0280156072
MB part = 1120780349
http://www.ebay.com/itm/Bosch-028015...5Xd8pF&vxp=mtr
Super Member
Joined: Aug 2014
Posts: 636
Likes: 19
C32 amg
There should be lots of info this matter misfire cylinder 1, u can take ur injectors out and them flow tested and cleaned see if it the problem, run pure gas highest octane, no ethanol with some seafoam see if it helps.
MBWorld Fanatic!
Joined: Mar 2004
Posts: 2,073
Likes: 27
From: North NJ
2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon
Super Member
Joined: Jul 2014
Posts: 992
Likes: 245
From: Tucson, AZ
'20 X5 M50i; '17 Ram 3500; Golf Cart; Bikes; Scooters
Actually, I have had injectors cleaned and flow tested to confirm that was the rough running issue I was having. This was not for a single cylinder misfire, but rough running. Here's why...
The oxygen sensors are reading the results of 3 cylinders on a C32, 4 on the V8 motors.
If one is rich, or lean, the O2 sensor averages the results and sets the fuel delivery to get the correct AVERAGE. Problem is, some cylinders are now rich, and some are lean.
Cleaning the injectors (I have used synthetic 2 stroke oil for lubricant, and Techron for cleaning) improved the issue which confirmed my thoughts. Flow and pattern testing before and after cleaning (by WitchHunter Performance) proved it was the problem.
If you do clean only, and not flow test, your results may still be poor due to mismatched injectors. If you had a sensor for each cylinder then each injector would be perfect, but you only have a sensor for 3 or 4 cylinders.
Your only other route is replace the bad one and hope the flow matches the others in the cylinder bank. It may be OK, but you will never know for sure.
The oxygen sensors are reading the results of 3 cylinders on a C32, 4 on the V8 motors.
If one is rich, or lean, the O2 sensor averages the results and sets the fuel delivery to get the correct AVERAGE. Problem is, some cylinders are now rich, and some are lean.
Cleaning the injectors (I have used synthetic 2 stroke oil for lubricant, and Techron for cleaning) improved the issue which confirmed my thoughts. Flow and pattern testing before and after cleaning (by WitchHunter Performance) proved it was the problem.
If you do clean only, and not flow test, your results may still be poor due to mismatched injectors. If you had a sensor for each cylinder then each injector would be perfect, but you only have a sensor for 3 or 4 cylinders.
Your only other route is replace the bad one and hope the flow matches the others in the cylinder bank. It may be OK, but you will never know for sure.
MBWorld Fanatic!
Joined: Mar 2004
Posts: 2,073
Likes: 27
From: North NJ
2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon
Actually, I have had injectors cleaned and flow tested to confirm that was the rough running issue I was having. This was not for a single cylinder misfire, but rough running. Here's why...
The oxygen sensors are reading the results of 3 cylinders on a C32, 4 on the V8 motors.
If one is rich, or lean, the O2 sensor averages the results and sets the fuel delivery to get the correct AVERAGE. Problem is, some cylinders are now rich, and some are lean.
Cleaning the injectors (I have used synthetic 2 stroke oil for lubricant, and Techron for cleaning) improved the issue which confirmed my thoughts. Flow and pattern testing before and after cleaning (by WitchHunter Performance) proved it was the problem.
If you do clean only, and not flow test, your results may still be poor due to mismatched injectors. If you had a sensor for each cylinder then each injector would be perfect, but you only have a sensor for 3 or 4 cylinders.
Your only other route is replace the bad one and hope the flow matches the others in the cylinder bank. It may be OK, but you will never know for sure.
The oxygen sensors are reading the results of 3 cylinders on a C32, 4 on the V8 motors.
If one is rich, or lean, the O2 sensor averages the results and sets the fuel delivery to get the correct AVERAGE. Problem is, some cylinders are now rich, and some are lean.
Cleaning the injectors (I have used synthetic 2 stroke oil for lubricant, and Techron for cleaning) improved the issue which confirmed my thoughts. Flow and pattern testing before and after cleaning (by WitchHunter Performance) proved it was the problem.
If you do clean only, and not flow test, your results may still be poor due to mismatched injectors. If you had a sensor for each cylinder then each injector would be perfect, but you only have a sensor for 3 or 4 cylinders.
Your only other route is replace the bad one and hope the flow matches the others in the cylinder bank. It may be OK, but you will never know for sure.
). Maybe it is wasteful, but I would still rather get 6 new injectors for $10-$13 per injector more than what the cleaning and flow testing of the old ones would be. But that's just me.
Super Member
Joined: Jul 2014
Posts: 992
Likes: 245
From: Tucson, AZ
'20 X5 M50i; '17 Ram 3500; Golf Cart; Bikes; Scooters
At that price, I'd just buy new injectors too. I was looking at injectors that cost $25 each, which is the cost to clean and flow test.
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Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,227
Likes: 185
From: Chicago
E63 SL55 996TT C5Z06
Actually, I have had injectors cleaned and flow tested to confirm that was the rough running issue I was having. This was not for a single cylinder misfire, but rough running. Here's why...
The oxygen sensors are reading the results of 3 cylinders on a C32, 4 on the V8 motors.
If one is rich, or lean, the O2 sensor averages the results and sets the fuel delivery to get the correct AVERAGE. Problem is, some cylinders are now rich, and some are lean.
Cleaning the injectors (I have used synthetic 2 stroke oil for lubricant, and Techron for cleaning) improved the issue which confirmed my thoughts. Flow and pattern testing before and after cleaning (by WitchHunter Performance) proved it was the problem.
If you do clean only, and not flow test, your results may still be poor due to mismatched injectors. If you had a sensor for each cylinder then each injector would be perfect, but you only have a sensor for 3 or 4 cylinders.
Your only other route is replace the bad one and hope the flow matches the others in the cylinder bank. It may be OK, but you will never know for sure.
The oxygen sensors are reading the results of 3 cylinders on a C32, 4 on the V8 motors.
If one is rich, or lean, the O2 sensor averages the results and sets the fuel delivery to get the correct AVERAGE. Problem is, some cylinders are now rich, and some are lean.
Cleaning the injectors (I have used synthetic 2 stroke oil for lubricant, and Techron for cleaning) improved the issue which confirmed my thoughts. Flow and pattern testing before and after cleaning (by WitchHunter Performance) proved it was the problem.
If you do clean only, and not flow test, your results may still be poor due to mismatched injectors. If you had a sensor for each cylinder then each injector would be perfect, but you only have a sensor for 3 or 4 cylinders.
Your only other route is replace the bad one and hope the flow matches the others in the cylinder bank. It may be OK, but you will never know for sure.
Thanks guys, as always super helpful your feedback has been to me and all the other members!
Considering my mileage and that new Bosch OEM injectors can be bought cheap (I just got 6 new ones on eBay for about 200 bucks today) it probably is cheapest to just replace all 6 injectors and hold off on the flow testing but good to know that is an option.
Now ow hopefully once I do this my cylinder 1 misfire goes away !!! Will report back on that shortly! Thx guys
