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#1
09-30-2011, 04:08 PM
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Help please: 90 300D (2.5 turbo) won't rev - sometimes
Father-in-law type person Ed drives a 90 300D (2.5 turbo). Complained night before last that it "hasn't been able to rev over 3800 rpm for a while." Says he just "stands on it getting on the freeway, goes up to 3800 and won't rev any higher, won't shift until I let off the gas a bit."
Of course, it's dark and raining at this point..... goes well with my complete lack of experience with diesels. I poke around looking for open vacuum lines (he's got a couple that are prone to pulling off any time he goes under the hood), can't see anything obviously amiss. Start the car, idles fine, pull the throttle cable under the hood, revs up fine. Sit down, confirm rev's up well past 4k in neutral. Out for a test drive, shifts normally, revs to ~ 4500 or so before doing so if I'm pushing it. Out on the highway, all seems normal. Return the car to Ed, call it a night. He didn't drive it yesterday. Today he did, calls me to say "won't rev past 3800 rpm again." Any hints as to where I should start looking to trouble shoot? Guessing fuel related, if for no other reason than he's been walking the bottom of the tank for the past several weeks (well and truly cash strapped). Thanks in advance!
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1961 220b: first project car - sold. 2000 CLK 430: first modern Benz - sold. 2001 CLK 55: OMG the torque!!! - sold 1972 280SE 4.5: Baby Gustav 1991 300TE 4Matic: Gretel the Snow Bunny - sold 1978 300SD: Katz the Free Man - given away 1980 Redhead: Darling Wife 
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#2
09-30-2011, 04:45 PM
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Hitting max stop? Fuel filters?
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#3
09-30-2011, 04:48 PM
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Check the condition of the filters. Also check the amount of play in the linkage cable that connects to the fuel pedal.
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92 300D 2.5L OM602 OBK #59
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#4
09-30-2011, 04:48 PM
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Sounds like a fuel problem if it revs in neutral but not under load. How long since the filters were replaced?
That model has electronic boost control. If the ECU senses something amiss such as a problem with EGR, it withholds boost which reduces power. Is it possible to get a boost gauge in view of the driver? There's no real fixing this problem since it uses archaic and esoteric OBD. Best to retrofit a boost actuated wastegate - Wastegate actuator swap for OM602.962? Move the throttle to WOT at the IP then have someone do it using the pedal. Is the pedal able to get the IP to WOT? Sixto 87 300D
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