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#1
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My 89 300SE starts immediately everytime and runs smmothly when it's 50 degrees or lower. When the engine is warm on a day above 50, it cranks a long time and when it does start it idles roughly for 5 to 10 seconds, then smooths out and runs fine. My mechanic says that this car has an older(less sophisticated)F.I. system and the hard start with a warm engine is characteristic of this vintage Mercedes. What do you think?
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#2
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What happens on a hot start if you depress gas pedal a bit durning cranking? Sounds like fuel bleed off from injectors, f/dist, & or fuel accumulator.
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#3
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I think your mechanic may not understand how it works and is afraid to tell you . It is not normal.
------------------ Benzmac: 1981 280GE SWB 1987 16V ASE CERTIFIED MASTER AUTO TECHNICIAN SERVICE MANAGER FOR 14 BAY FACILITY MERCEDES SPECIALIST 8 YRS PARTNER IN MERCEDESSHOP.COM |
#4
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quote: M.B.Doc, Depressing the gas pedal makes the engine crank longer without starting. Why does the engine start so fast when cold vs. hot? |
#5
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quote: Benzmac, My mechanic may not understand how it works. I would like your opinion on why you think the engine starts better cold vs. hot and what will fix it. Thanks. |
#6
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Quote:
Best, CD |
#7
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Could be your coolant temp sensor that sends engine temp signal to ECU and ICU. If this signal is not correct, the air/fuel ratio is messed up. Maybe the ICU thinks your car is still cold and sends in more fuel than needed. I dont know where it may be located on your car, but you can ask people on FastLane or whoever your parts dealer is, try replacing it if you have not replaced it ever. For reference, on my 87, 260E, it is the last sensor on the engine, closest to the windshield, because there are more than one coollant temp sensor on my car and perhaps on your car too.
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Saumil S. Patel |
#8
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Quote:
after radiator change its acceptable Would this be applicable to a 83 SEC? I'm having the same hot start problem starts in a nano second when stone cold but oooh it struggles when the engine is at or even below operating temp. Depressing the gas petal a bit does not really cure it Still have the problems but it does eventually start but I am draining battery & starter motor Its a one run car After that it wants to rest...LOL Ole timer.... Thanks
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~Shadow~ 83 500 SEC Euro 198K |
#9
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Quote:
that opens at 50C I am assuming you are talking about external weather temp not car? Odd but maybe it has something to do with that TVV?
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~Shadow~ 83 500 SEC Euro 198K |
#10
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Camelotshadow, did you get your problem resolved? Sounds like our's are EXACTLY the same.....
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#11
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cdplayer
Quote:
Still had warm/hot start cranking issues. Finally, I bit the bullet and bought a new set of injectors along with new seals. My '84 500SEC starts instantly warm/hot/cold. Ten seconds after shut off or two hours. I have 237,000 on the clock with origonal pistons and rings. And she starts right up each and every time. The cost of new injectors, seals, and seats is worth cancelling the frustration if you can do it. Search my other posts (cdplayer) if your SEC has issues. Perhaps the struggle I have endured will help you out some. Have a great day!!! |
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