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#1
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My Benz hates Hills
OK, so as the title says, my benz hates hills.
My 83 300SD has plenty of power on the flatland. Plenty of power and acceleration. However, going up hills it is a total dog. I get around 40-45mph. On the Freeway, I have to pull over into the "truck" lane with my hazard lights on. What I have done: - I cleaned out my Banjo bolt and vacuum lines. - I have a Vacuum pressure gauge mounted above my dash and it is reading 6 to 8 psi going up the hill. - I recently replaced the fuel filter(s) to see if that would help. No luck. What else can I look into?
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Big Fred (RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky") (RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre") |
#2
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I've always thought that it should boost anywhere from 10 to 12 psi? I could be wrong, but maybe you are having issues with your turbo or boost control system?
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles |
#3
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when was your last valve adjustment performed?
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#4
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I'm guessing that the ALDA still isn't getting boost signal. I think the 126 has some sort of overboost protection valve that sometimes goes bad. That may be your problem.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#5
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Its been over a year since the last valve adj.
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Big Fred (RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky") (RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre") |
#6
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If it's been over 15,000 miles, do a valve adjustment and tell us if that helps.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar. 83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles 08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles 88 Jaguar XJS V12 94,xxx miles. Work in progress. |
#7
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I assume the vacuum pressure gauge is on the vaccum system? The turbo makes pressure. If so what negative pressure is present on the flat? I may be wrong so if you could clarify.
The gauge reading you really should have is the fuel pressure present in the base of the injection pump. Under high load conditions going uphill the engine may be fuel volume starved. Or some sneaky vendor put a 300d trunk label on a 240d. |
#8
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6-8 psi is to low. You should hit 11psi minimally. Also certainly valve job.
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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 |
#9
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I'm betting it is shifting into 4th gear and lugging up the hill. If you manually shift the gear selector down to 3rd or 2nd gear on the hill does that help?
How big/steep are these hills? A 300SD running properly can easily hold 80ish+ mph up most hills....at least mine can.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#10
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What is your vacuum pressure gauge reading?
Could be a plugged tank strainer. Switching inlet and return hoses would confirm/deny this.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#11
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switching lines on a W123
Kerry, do you have any experience switching the fuel lines to check for a clogged tank strainer on a 300D? I'm having similar problems as the OP (fine performance until getting to highway speeds, then the car feels fuel-starved accelerating over about 50 MPH or so). Do you mean to switch the lines under the hood where the metal lines meet the rubber ones? I tried this morning and the return ("cigar") hose wouldn't reach the metal line that carries the fuel from the tank. Should I get a length of fuel hose and temporarily replace the cigar hose?
Thanks! Charlie
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05 E320 CDI - 175K miles 82 300D - 200K miles (sold) |
#12
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You are definitely running low turbo pressure. I would first check the line from the back of the intake manifold to the over boost valve and then to the alda. If you remove the line from the over boost valve and then try it you can see if you now have good pressure (don’t leave it this way buy just do it to test). If that is good you need to adjust the waste gate to get 7 to 8 bar or 10 to 11.5 PSI. Adjust your valve also.
The picture shows the waste gate on my car
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1983 300SD 200000miles |
#13
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MI doesn't have hills like Socal. The OP is likely talking about mountain passes since he mentions truck lanes, 45mph, etc.. 5% grades or more for 2-3 miles, etc. Most of these cars can get over the top at 55-60mph when in proper tune, but not 80mph.
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1982 240 D, 308,000 - 321,127 miles (sold) 1982 300 TD,166,500 - 226,000 miles 1998 E 320, 120,000 - 144,000 miles 2005 C 230 K, 26,000 - 77,000 miles (sold) |
#14
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Thanks all,
A friend helped me do the valve adjustment over the weekend. All of the valves were badly in need. After the adjustment, there was a considerable increase in power available. I haven't taken it up the big hills yet, but so far so good. One question, is it typical that after a valve adjustment that I would need to adjust the transmission shifting as well? It seems to rev pretty high between each of the gears. If this is the case, how do you make the adjustment?
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Big Fred (RIP Sept '10) 83 300SD Turbo Diesel (aka "Rocky") (RIP April '10 - Accident) 86 Chevy M1009 CUCV (Blazer) - 6.2L Diesel (aka "Ogre") |
#15
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It's possible that during the valve adjustment, you've inadvertently tightened the bowden cable from the transmission. Check and recheck the bowden cable for slackness or tightness. To make it shift just a tad bit earlier, slacken. To increase time spent in a gear, tighten.
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Allen Kroliczek Oak Grove Autosport | Oak Grove Autosport 01 G500, 82 300TD, quite a few more..... |
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