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#1
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Engine Misses ?????
I just got back from New York with a 83 300SD. The engine misses really
bad when cold. After it warms up it's not that bad. But still misses. I am guessing its a bad injector, but thought I would ask you guys what you think. It also shifts hard from 1st to 2nd and flares from 3rd to 4th? Thanks. Jason |
#2
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Here is what my suspicions would be .........
"Misses" or nailing while cold, I would very much suspect a defective glow plug. And depending on how long it has been that way, may have caused some carbon build-up.
Changing out the glow plug(s) and cleaning the injectors in a dunk tank of carburater cleaner might be the ticket. That's what I would try first anyway.
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#3
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It misses. I think the fuel timing is off alittle too.
Thanks. Jay |
#4
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how long does it take to run smoothly?
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#5
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Possibly a broken prechamber ball. Had one break loose from it's mount inside the prechamber while driving and caused a miss at normal operating temperatures. This was on a '60's model but would think the same thing could occur with an '80's model as they are designed the same.
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#6
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how long ago since the valve clearences were last attended to ?
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'72 240D '76 300D '88 300sel '40 Chev pickup , the shop hack. '73 Monte Carlo Landau, for "Super Chevy Sunday" |
#7
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There are several things that could cause it. But I would test the glow plug circuit and ohm the plugs out first, valve adjustment, timing check. Then report back. Lets eliminate those items first.
http://dieselgiant.com/glowplugrepair.htm http://dieselgiant.com/valveadjustment.htm
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1981 300D 147k 1998 VW Jetta Tdi 320k 2001 Dodge Ram 2500 141k 1979 300D 234k (sold) 1984 300D "Astor" 262k(sold) Mercedes How-To and Repair Pictorials I love the smell of diesel smoke in my hair |
#8
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Targa,
If the GP pass the resistance test, do the following: Immediately after U start the engine and it is mis-firing, try to isolate a mis-firing cylinder by loosening the nuts on the top of the injectors one at a time. If U don't notice a difference in the engine speed or sound when the nut is loosened, that is the cylinder that is mis-firing. A slight amount of fuel should leak out when U loosen the nut. If you find a definite cylinder that is mis-firing, switch that injector with one from a good cylinder. If the mis-firing moves with the injector, its the injector that's bad. If the mis-firing doesn't move, then there is something wrong with the cylinder. It could be the ball pin or low compression from a leaking valve or rings. If the engine mis-fires after its warm, is not a GP problem. P E H |
#9
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Thanks everyone, I am going to try the things listed and report back.
Thanks again, Jay |
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