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"Fueled out" and losing power at high speeds? (617t)
My 300SD likes to use a bit of oil (1 qt per 1000 but it leaks quite a bit of that) but fires off with very little glow, can reach 100+ on the flat, and only loses steam on really big hills (such as the one outside Indio, CA eastbound on I-10- "Shut off A/C next 10 miles" read the signs)... it just has a very disconcerting tendency to lose *all* its forward momentum at 70+, you slowly lose speed until you're doing 50.
This is on level ground. Speaking of the Mojave, that's where it happened Sat AM while heading to L.A.... very scary, you panic, is it gonna die entirely? When this happens, a few interesting notes: I have a Dawes boost controller set to 13 psi and a VDO gauge. Boost at speed varies 5-13 psi depending on pedal position. I can usually, at 70, have 7 psi on the gauge, stab the pedal, and get anything up to 13 depending on how hard I "shuffle" on the pedal. When this happens, the boost drops to 5, stays there even with the pedal on the floor, and here's the "fueled out" part- no smoke. Nothing billows out behind. This makes me think it's out of fuel, can't flow any more, can't make any boost to speak of. Letting it coast down to about 40-45, then flooring it usually brings back full whoooosh back up to whatever cruise I want. Tank strainer? I had something similar to this- the car wouldn't exceed 67 mph and didn't smoke at all, max boost 6 psi. New filters fixed that. This new power drop is disconcerting in the desert, and only happens every few weeks.
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1985 300TD 1984 380SL 1983 280SE (full Euro, trunk triangle and all!) Formerly owned: 1986 420SEL 1984 300D 1983 300D 1981 300SD 1976 300D |
#2
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Sounds like you already know what to do first. New fuel filters, clean the tank screen, blow out your metal fuel lines.
Good luck, Scott
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Scott 1982 Mercedes 240D, 4 speed, 275,000 1988 Porsche 944 Turbo S (70,000) 1987 Porsche 911 Coupe 109,000 (sold) 1998 Mercedes E300 TurboDiesel 147,000 (sold) 1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!) 1997 Mercedes E300 Diesel 236,000 (sold) 1995 Ducati 900SS (sold) 1987 VW Jetta GLI 157,000 (sold) 1986 Camaro 125,000 (sold - P.O.S.) 1977 Corvette L82 125,000 (sold) 1965 Pontiac GTO 15,000 restored (sold) |
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