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#1
07-24-2016, 08:54 AM
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M103 injectors - the guide I wish I had
My 1990 300e idles a bit low and rough. Especially when warm. Also it sometimes takes two or three attempts to start. Lots of things to check out, I know, but anyway today I decided to do the injector seals. Very cheap and potentially helpful.
Basically it is an easy job. It's good to have a ball-end hex key for the holders. Like this  And a semi-closed 14mm wrench for the fuel lines:  Remove the air filter box and loosen the cable canal to get access  Use a 17mm wrench to counter hold the holder and release the fuel line. I did not release the fuel lines from the distributor. Injectors out  I was absolutely not able to slide the old seals off. Tight fit. I simply broke them to pieces. Wise grip locking pliers is handy. At first I didn't realize that the plastic sylinders going down in the manifold can come loose too. Just pull them out. Fitted o-rings to them and refitted. (Was much quicker the second time in the same day... - see below. Thanks duxte1!)  The injector 3 and 4 is a bit of a hassle to reach but apart from that it is smooth sailing. Anyway - car started - difference was ... Subtle. At least I know these parts are ok now. Should probably have the injectors inspected and/or replaced too. Later Last edited by larsko; 07-28-2016 at 05:03 AM. Reason: Typo 
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#2
07-24-2016, 09:00 AM
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The O-rings seal the plastic injector holders into the intake manifold, and not the injector to the holder.
__________________
 90 300TE 4-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff
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#3
07-24-2016, 09:07 AM
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Thanks for the reply. Pull the plastic "tube" and put the o-ring underneath? Would it matter if they stay where they are? It seems to be running fine
- edit - did it properly. Edited post. Thanks Last edited by larsko; 07-24-2016 at 11:46 AM.
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#6
07-25-2016, 06:17 AM
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Larsco thank you for the walk through .This is my next job .I have all the parts waiting to do it ...
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#7
07-27-2016, 09:07 PM
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Thanks for this post. I plan to do my fuel injectors soon too but I wasn't sure which parts to order besides the injectors themselves and I didn't want to get into the job and discover I didn't have everything I needed. That's the worst.
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#8
07-27-2016, 11:00 PM
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Stick some [IMG] tags around your picture URLs and we'll be able to see them!
The last tag needs to have a "/" character before the "I" to indicate the end of the link
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#9
07-28-2016, 02:50 AM
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Img doesn't work with Dropbox it seems... [img]https://www.dropbox.com/s/uluf0a40uf38zhv/Photo%2024.07.2016%2C%2015.27.51.jpg/img]
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#10
07-28-2016, 04:19 AM
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Quote:
 
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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#11
07-28-2016, 04:22 AM
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I copied your link in your quote but it didn't work - so I right clicked on the picture in drop box and then copied the URL to get the first picture of your series...
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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#12
07-28-2016, 05:05 AM
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Quote:
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#13
07-29-2016, 02:38 AM
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Now they've all gone.
It looks like dropbox is blocking
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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#14
07-29-2016, 12:46 PM
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Larsko did you have any fuel come out from the injector pipes after you removed them?
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#15
07-29-2016, 12:54 PM
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No - i removed pressure from the system first. Removed the fuel pump relay (behind the battery) and ran the starter for a few seconds
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