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#1
05-07-2018, 06:02 PM
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'91 300CE fuel injector question
I have had trouble getting this car running right for several years...recently I decided to pull the FD to check all the hoses under it for leaks and lo and behold I found 2 hoses cracked. I'm sure this pretty severe vacuum leak has not helped my cause.
I also decided to pull the injectors - they all pulled right out - very easily - meaning, I'm sure another whole set of vacuum related issues. The rubber seats/bushings are all hard and brittle. I'm trying to decide if I need to replace all of the injectors. I pulled each one and squirted carb cleaner through them - the little plastic tube from these cans of cleaners fits snugly in the injector - and after one or 2 squirts, the injectors all spray in a nice cone shaped, misted pattern. The tips look clean and I'm thinking of just putting them back in, replacing the fuel injector insulator, o-ring and the rubber seal. The car has just over 90K on it - what do you guys think? I think they're clean, but I know they may still not be operating properly - opening at the right pressure, bleeding off when car is turned off... Any help would be appreciated. Thanks. ryan
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RG Newell 1984 300D 1972 250 1986 560SL 1991 300CE 
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#2
05-07-2018, 07:37 PM
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Bench testing them is the only way to really know what shape they are in, at this point all you know is that they're not clogged.
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 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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#4
05-08-2018, 11:56 AM
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Replace them and all the seals. Best $250 you'll ever spend. Check your intake boot under the FD while you are at it. Mine was not fully seated (previous owner or shop put it on wrong) and was creating a massive vac leak. New one is $40, while you have the injector lines off to replace the injectors, put a new boot on it. Make sure it is seated all the way around. I had to make a tool out of bent coathanger to work the back side down through the intake with the metering flap pushed down for access.
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