Bosch Diesel Injector Refurb

chrissyw · 04-23-2021, 08:09 AM

Whilst my BMW is only a 4 pot, it still runs the same injectors as the M57 330d so I thought i'd ask the question anyway.

Is it difficult refurbishing / re-manufacturing injectors?

The reason I ask is I recently purchased one that had been refurbished that was under fuelling quite badly.

I look about on ebay and there seems to poor feedback or returns of Bosch injectors for M57's.

Is it difficult with these or something?

Papogator24 · 04-24-2021, 07:45 AM

I wouldn't recommend rebuilding/refurbing yourself as it has to be flow tested as well. If you're on a budget, you could look for remans from Rockauto. I'd buy new and be done with it. Usually, the new one comes with warranty.

chrissyw · 04-26-2021, 04:12 AM

Quote:

Originally Posted by Papogator24

I wouldn't recommend rebuilding/refurbing yourself as it has to be flow tested as well. If you're on a budget, you could look for remans from Rockauto. I'd buy new and be done with it. Usually, the new one comes with warranty.

I bought a 'reconditioned' one off ebay put it didn't come with any kind of test result.

Seems like it wasn't flow tested and was unfortunately, massively under fuelling.

It seems to be quite a common issue.

Tambohamilton · 04-26-2021, 04:28 AM

I have read from refurbing places that it's not recommended or unlikely to be successful when refurbing Bosch piezoelectric diesel injectors. Buy new and have done.... Buy cheap, buy twice. I think even buying 'good, used' injectors is a bit of a gamble.

chrissyw · 04-27-2021, 03:31 AM

Quote:

Originally Posted by Tambohamilton

I have read from refurbing places that it's not recommended or unlikely to be successful when refurbing Bosch piezoelectric diesel injectors. Buy new and have done.... Buy cheap, buy twice. I think even buying 'good, used' injectors is a bit of a gamble.

I have unfortunately been bitten twice.

Firstly with a used injector which was 'fully working, used'. On the outset at idle it was working perfectly. Under load it was massively overfuelling.

I then got a reconditioned injector that was underfuelling.

Tambohamilton · 04-27-2021, 03:53 AM

Bummer.

Can I ask how you check the over/under-fuelling?

chrissyw · 04-27-2021, 05:04 AM

Quote:

Originally Posted by Tambohamilton

Bummer.

Can I ask how you check the over/under-fuelling?

I use INPA and ISTA but in all honesty, I didn't need to as by driving the car you could tell something was wrong.

The car was missing badly under acceleration, backed up by INPA going off the scale for cylinder 2.

Bummer really.

My current injector seems very lazy and has been for years but it's now starting to become an issue when starting cold. I keep getting a rough running fault code and the car shakes for about 20 seconds before calming down. This used to be a cold weather issue so I did the glow plugs and controller which did make a little difference but it's doing it all year round now.

jacbo · 04-27-2021, 05:18 AM

How many miles are you on?
I would break out the piggy bank and get at least 1 brand new injector to replace the dodgy one or even shell out for all 4... At least you don't have a 6 cylinders ahha

chrissyw · 04-27-2021, 06:42 AM

I'm on 174,000 miles now. The other 3 injectors look great, which is great considering I had it mapped at 86k.

I have decided to give one more reputable injector recondition chap a go.

I don't particularly want to buy a brand new one as I will probably get rid of the car in 12 months time.

jacbo · 04-27-2021, 06:47 AM

Quote:

Originally Posted by chrissyw

I'm on 174,000 miles now. The other 3 injectors look great, which is great considering I had it mapped at 86k.

I have decided to give one more reputable injector recondition chap a go.

I don't particularly want to buy a brand new one as I will probably get rid of the car in 12 months time.

That was going to be my next question tbf, if you planned on keeping it long. So I do see your dilemma.

And best of luck with that one. hopefully that will be the last time you have to mess about with injectors.

Tambohamilton · 04-27-2021, 06:58 AM

Any sort of warranty on the refurbed injector?

chrissyw · 04-29-2021, 04:18 AM

1 year warranty.

Rebuilt with genuine bosch components, ball bearing, ball bearing seat, high pressure shims and tested with print out on a BOSCH EPS 118.

All sounds good.

We'll see.

Tambohamilton · 04-29-2021, 09:38 AM

If the warranty is worth the paper it's written on, I guess it'll all be fine

chrissyw · 05-02-2021, 05:17 AM

Well I've fitted the new injector and it's not rough idling on a cold start but cylinder 2 is showing at -3.5 on INPA.... On the previous 'reconditioned' injector it was running at -4. On my bad injector it was +3.5

https://ibb.co/PTcJ51S

When the coolant temp is at 85 degrees it's running at 0.5.

Is this something I need to be concerned about?

Tambohamilton · 05-02-2021, 07:27 PM

Did you do the thing with the injector calibration code, and clear all adaptations? Did you then run it through a normal driving cycle?

chrissyw · 05-05-2021, 02:07 PM

I coded it in via ISTA but I have no option to clear all adaptations. It doesn't exist in ISTA, ISTA-D or INPA.

There is a gap where it should be in the menu structure.

Is this related to my EGR valve being mapped out when I had the car remapped?

J21J · 07-23-2021, 03:15 PM

Did you get to the bottom of this? Injector 1 and injector 3 work in conjunction to try and get a figure of zero. Injector 2 & 4 work in conjunction the same way. There is also a little bit of crossover between the injectors to try and get that magic zero.

Injector 2 is cutting back heavily because the other 3 injectors look like they are struggling to keep up. They look like they have worn evenly. There is also a chance that injector 2 is leaking too much fuel at the nozzle but it is unlikely as it is "new".

chrissyw · 10-07-2021, 02:18 AM

Quote:

Originally Posted by J21J

Did you get to the bottom of this? Injector 1 and injector 3 work in conjunction to try and get a figure of zero. Injector 2 & 4 work in conjunction the same way. There is also a little bit of crossover between the injectors to try and get that magic zero.

Injector 2 is cutting back heavily because the other 3 injectors look like they are struggling to keep up. They look like they have worn evenly. There is also a chance that injector 2 is leaking too much fuel at the nozzle but it is unlikely as it is "new".

I did all the seals as they were on their last legs.

Injector 2 is still up at 2.8 on INPA.

The issue I have is I can't reset the adaptions and i'm 90% sure it's due to the map I had on it 6 years ago.

When i'm passing, i'll pop in and see him as I had the EGR mapped out. I think it's related.

04-23-2021, 08:09 AM	#1
chrissyw Second Lieutenant 36 Rep 242 Posts Drives: 2006 E90 320d M Sport Join Date: Mar 2014 Location: Midlands iTrader: (0)	Bosch Diesel Injector Refurb Whilst my BMW is only a 4 pot, it still runs the same injectors as the M57 330d so I thought i'd ask the question anyway. Is it difficult refurbishing / re-manufacturing injectors? The reason I ask is I recently purchased one that had been refurbished that was under fuelling quite badly. I look about on ebay and there seems to poor feedback or returns of Bosch injectors for M57's. Is it difficult with these or something?
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04-24-2021, 07:45 AM	#2
Papogator24 Private 19 Rep 69 Posts Drives: BMW X5 3.5i Join Date: May 2019 Location: Miami iTrader: (0)	I wouldn't recommend rebuilding/refurbing yourself as it has to be flow tested as well. If you're on a budget, you could look for remans from Rockauto. I'd buy new and be done with it. Usually, the new one comes with warranty. __________________ 2013 X5 35i 2011 335d - Deleted and Tuned by BRR 2008 Toyota Tundra SR5 Double Cab
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04-26-2021, 04:28 AM	#4
Tambohamilton Brigadier General 3058 Rep 3,909 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	I have read from refurbing places that it's not recommended or unlikely to be successful when refurbing Bosch piezoelectric diesel injectors. Buy new and have done.... Buy cheap, buy twice. I think even buying 'good, used' injectors is a bit of a gamble.
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04-27-2021, 03:53 AM	#6
Tambohamilton Brigadier General 3058 Rep 3,909 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	Bummer. Can I ask how you check the over/under-fuelling?
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04-27-2021, 05:18 AM	#8
jacbo Second Lieutenant 79 Rep 287 Posts Drives: E90 330d LCI Join Date: Sep 2020 Location: Cheshire iTrader: (0)	How many miles are you on? I would break out the piggy bank and get at least 1 brand new injector to replace the dodgy one or even shell out for all 4... At least you don't have a 6 cylinders ahha
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04-27-2021, 06:42 AM	#9
chrissyw Second Lieutenant 36 Rep 242 Posts Drives: 2006 E90 320d M Sport Join Date: Mar 2014 Location: Midlands iTrader: (0)	I'm on 174,000 miles now. The other 3 injectors look great, which is great considering I had it mapped at 86k. I have decided to give one more reputable injector recondition chap a go. I don't particularly want to buy a brand new one as I will probably get rid of the car in 12 months time.
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04-27-2021, 06:58 AM	#11
Tambohamilton Brigadier General 3058 Rep 3,909 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	Any sort of warranty on the refurbed injector?
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04-29-2021, 04:18 AM	#12
chrissyw Second Lieutenant 36 Rep 242 Posts Drives: 2006 E90 320d M Sport Join Date: Mar 2014 Location: Midlands iTrader: (0)	1 year warranty. Rebuilt with genuine bosch components, ball bearing, ball bearing seat, high pressure shims and tested with print out on a BOSCH EPS 118. All sounds good. We'll see.
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04-29-2021, 09:38 AM	#13
Tambohamilton Brigadier General 3058 Rep 3,909 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	If the warranty is worth the paper it's written on, I guess it'll all be fine
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05-02-2021, 05:17 AM	#14
chrissyw Second Lieutenant 36 Rep 242 Posts Drives: 2006 E90 320d M Sport Join Date: Mar 2014 Location: Midlands iTrader: (0)	Well I've fitted the new injector and it's not rough idling on a cold start but cylinder 2 is showing at -3.5 on INPA.... On the previous 'reconditioned' injector it was running at -4. On my bad injector it was +3.5 https://ibb.co/PTcJ51S When the coolant temp is at 85 degrees it's running at 0.5. Is this something I need to be concerned about?
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05-02-2021, 07:27 PM	#15
Tambohamilton Brigadier General 3058 Rep 3,909 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	Did you do the thing with the injector calibration code, and clear all adaptations? Did you then run it through a normal driving cycle?
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05-05-2021, 02:07 PM	#16
chrissyw Second Lieutenant 36 Rep 242 Posts Drives: 2006 E90 320d M Sport Join Date: Mar 2014 Location: Midlands iTrader: (0)	I coded it in via ISTA but I have no option to clear all adaptations. It doesn't exist in ISTA, ISTA-D or INPA. There is a gap where it should be in the menu structure. Is this related to my EGR valve being mapped out when I had the car remapped?
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07-23-2021, 03:15 PM	#17
J21J Enlisted Member 3 Rep 32 Posts Drives: Bmw E90 Join Date: Jul 2021 Location: Scotland iTrader: (0)	Did you get to the bottom of this? Injector 1 and injector 3 work in conjunction to try and get a figure of zero. Injector 2 & 4 work in conjunction the same way. There is also a little bit of crossover between the injectors to try and get that magic zero. Injector 2 is cutting back heavily because the other 3 injectors look like they are struggling to keep up. They look like they have worn evenly. There is also a chance that injector 2 is leaking too much fuel at the nozzle but it is unlikely as it is "new".
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