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#1
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Balky injector
Recently, my 92 300SE has developed a significant miss at first start-up.
Assuming an intact and properly working valve-train, it's down to spark or fuel. At the last plug change, all 6 looked by-the-book, and the car's not using any oil or burning any. Ignition system, except for the coil, is brand new. Rev it up a bit and the problem goes away. I'm doing some major work on the car, and as such am not driving it every day. Started it a few days ago and had the chance to check the injectors. Missing is like 1 cylinder is dead. Starting at the front of the motor, unplugged the 2nd injector (1st was too hard to get at), and got a noticeable downgrade in idle. Plugged it back in, back to missing on a single cylinder. Unplugged 3rd - same as second. Unplugged 4th - same as 3rd. Unplugged 5th - no change. BINGO! Plugged it back in - idle smooths out just fine. Checked with MB and at my cost, a new injector is $130!!! I'm thinking about trying some sort of fuel-rail added cleaner. Is this a good idea, and are there any suggested brands? |
#2
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bump...
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#3
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Have you checked the dist cap & spark plug wire?
Injector failure is RARE on that most new cars!
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#4
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Dist cap and plug wires are brand new.
I would have thought that when you unplug the injector and see no change, that the problem is isolated to fuel. Thinking about it further I see that if no spark is present, removing the fuel will have no effect. I can repeat the test by pulling the plug wire and seeing if I get the same effect - although the reverse is now true - removing spark when no fuel is present will have no effect. Wiring harness has been replaced. I'll pull the plug and see what I find. Maybe there's a piece of crap on it that is causing misfire until everything gets a little warm. Regardless - it couldn't hurt to run some injector cleaner through, right? I'm thinking fuel-rail administered systems - not through the tank stuff like Techron. Any suggestions? |
#5
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don't you have a coil on #5 plug and could it be the infamous coil to plug connector?
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg |
#6
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no coil on plug on a 92 300se - LH-SFI here.
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