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#1
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Question re: '90 300CE & M104 engine
My 1990 300CE has just developed an "issue" (they are always "issues" and never "problems"). Before I take it to Enrique @ Mr. M.B. Motors, I would like to take a stab at fixing it myself.
Here is the "issue": 1. The car starts fine (though not always on the first crank), it runs fine, accelerates fine and it idles as smooth as butter. 2. If I stop and turn the engine off and then start again a few minutes after stopping the engine, the idle will be a little shaky (but never to the point of rough). If I try to drive the car, the throttle does not respond, I can floor the car and I don't get much movement, then the engine "catches" and the car accelarates normally. 3. If I let the car idle for 30 seconds or so, I don't get the problem. 4. Also, if the car has been stopped for more than just a few minutes, then I don't experince this issue. I have informally timed it, and if the car is stopped for more than 10 to 12 minutes, then there is no problem. 5. Only a short, brief stop causes the problem. 6. When the car experiences the "slow accelaration" issue, it feels as if the car is starved for fuel. 7. Fuel economy has remained the same (in fact, fuel economy went up slightly after putting in a new set of Michelins). I had suspected the fuel pump(s) or the fuel distributor, but the fact that the car only does this after it has been stopped for a brief while (and does not do it after a long stop) makes me question my diagnosis. I did a search here and did not quite find the same issue (maybe I was using the wrong search terms). Any suggestions would be greatly appreciated. Thanks.
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Current Benzes 1989 300TE "Alice" 1990 300CE "Sam Spade" 1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007) 1998 E320 "Orson" 2002 C320 Wagon "Molly Fox" Res non semper sunt quae esse videntur My Gallery Not in this weather! Last edited by BENZ-LGB; 07-15-2008 at 02:38 PM. |
#2
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When was the last time the fuel filter was changed?
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If it ain't broke take it apart and find out why. 1983 300SD, 4 speed 1994 C280 1987 300TD wagon 1996 HD Road King Ride in Peace Eric Peterson, Harley of Macon |
#3
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Good question...but how would a dirty fuel filter cause the engine issue only after the engine has been off for 10 - 12 minutes and not cause the engine issue if the engine has been off for a longer period of time?
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Current Benzes 1989 300TE "Alice" 1990 300CE "Sam Spade" 1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007) 1998 E320 "Orson" 2002 C320 Wagon "Molly Fox" Res non semper sunt quae esse videntur My Gallery Not in this weather! |
#4
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Any other suggestions????
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Current Benzes 1989 300TE "Alice" 1990 300CE "Sam Spade" 1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007) 1998 E320 "Orson" 2002 C320 Wagon "Molly Fox" Res non semper sunt quae esse videntur My Gallery Not in this weather! |
#5
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Slight fuel bleed-off from injector OR fuel distributor.
OR a slightly weak coil or crank sensor.
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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 |
#6
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Start with needed maintenance
My very same car did this once or twice. Then all was well, and has not returned, since I did a BG Induction System service.
Pressure bleed-off would cause a hard start condition, but once the engine is started, there should be no noticable troubles. Carbon build up on the valves and combustion chamber is a likely cause. Find a shop that does this service, it really is the best. http://www.bgfindashop.com/bgservices/fuelair.htm
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1990 300CE. Garage kept all its life. Looks & Runs Like New. Everything works. White w/Palomino int. Pioneer 12 CD player in the boot. 17" Enkei LX-F Chrome wheels w/Falken Azenis ST-115 225-45 tires. Tinted windows. Black sports grill w/Euro clear front lamps. |
#7
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BENZ-LGB, Harry here. If you recall, same year, same model. Change your plugs. Torque them to specs. 20 lb-ft.
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11 S550 09 C300 91 560SEL 90 300CE 84 380SE 83 240D |
#8
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Quote:
I love your 300CE. As you can see from my signture, I love these cars. I miss my red 300CE very, very, very much. Would love to see a bigger pic of your 300CE. Again, thanks for the tip.
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Current Benzes 1989 300TE "Alice" 1990 300CE "Sam Spade" 1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007) 1998 E320 "Orson" 2002 C320 Wagon "Molly Fox" Res non semper sunt quae esse videntur My Gallery Not in this weather! |
#9
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Smell any fuel at all?
Mine would do that, as one of the fiel lines was a little loose....
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-Justin 91 560 SEC AMG - other dogs dd 01 Honda S2000 - dogs dd 07 MB ML320 CDI - dd 16 Lexus IS250 - wifes dd it's automatic. |
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