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#1
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Anemic / Slow Acceleration Problem SOLVED!!! Cleaned Switchover Valve - WOW!
Anemic / slow acceleration problem solved!!!
You guys are great! ALDA was definitely not getting boost. Cleaned Turbo Overboost Protection Relay / Switchover Valve ? - was all packed up with soot - had to use wire and lots of carb cleaner, but broke it loose, and YEEHHHHAAAA the old girl will do 100mph now, and thats with 302,000 on it! This was one of the easiest fixes I have ever done that made such a huge improvement. These cars are so much fun to play with. Thank you all for all your help and suggestions. I'll still do the valve adjustment and I have no idea when it was last done. I can't wait to see what it feels like then! Thanks again all! Last edited by 85MB300D; 05-11-2008 at 10:35 AM. |
#2
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is it possible to have bypassed the switchover valve? there is a vacuum valve looking thing thats bolted to the heat shield against the firewall which my mechanic said he bypassed. I was wondering if this is the switchover valve?
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#3
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Yeah, I'm not exactly clear on this "switchover valve" you're talking about either...
Got any pictures?
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1984 300 Coupe TurboDiesel Silver blue paint over navy blue interior 2nd owner & 2nd engine in an otherwise 99% original unmolested car ~210k miles on the clock 1986 Ford F250 4x4 Supercab Charcoal & blue two tone paint over burgundy interior Banks turbo, DRW, ZF-5 & SMF conversion 152k on the clock - actual mileage unknown |
#4
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the "switchover valve" you are most likely referring to is the overboost protection relay.
it is there to prevent the alda adding fuel to the system in the event of excessive turbo boost. modify at your own risk.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#5
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You might consider disabling your egr so you there are no repeat performances of the above.
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Cheers, Robert |
#6
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I believe it is just a bad choice of words the Switchover Valve I belive is the name of the on/off valve that allows the hot coolant to go to the hearter core or not. Also on the fire wall but on the passenger side near the intake manifold.
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84 300D, 82 Volvo 244Gl Diesel |
#7
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Quote:
I apologize for using the incorrect terminology. Others on this board have referred to the Overboost Protection Relay as the Switchover Valve, so that is why I used the later term. The device I removed and cleaned is indeed the Overboost Protection Relay. Sorry for any confusion. |
#8
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Follow the hard plastic opaque colored line that goes from it to the the device on the firewall, behind the brake booster. This device is the Overboost Protection Relay (OPR). This device (and lines), if clogged will prevent proper boost from reaching the ALDA, which means your engine will not receive the proper amount of fuel relative to how much you are pushing the go pedal. The OPR needs to be taken off, cleaned with carb cleaner and in my case, wire to reem out the soot. There is another hard plastic opaque colored line that goes from the OPR to the back of the intake manifold. Both of these lines need to be free from soot. Also, make sure the banjo bolt at the back of the intake manifold is free from soot as well. Remove, clean, install and watch your frown turn upside down with "new power" from your diesel. The difference was night and day. |
#9
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That is the "monovalve."
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#10
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switch/bolt clarrification
Just to clarify, you cleaned the actual OPR switch, or the banjo bolt and plastic as in the DG tutorial? I'm also hearing carb cleaner from you and brake cleaner from DG, do you think it matters?
I'm having a similar problem with my 85 300DT. I noticed, however, that it is mostly slow to accelerate from idle, and has some pep if it's at 30 or more mph, so this might not work for me. Going to give it a shot anyway. \ Cheers! |
#11
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#12
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still looking
thanks to all for the great info here,does my 87 300d have this banjo bolt set up
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#13
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I cleaned the valve out with brake cleaner, soot shot out the other end..also used a wire to clear the opening that the line connects to on the manifold. If yours is clogged, you're in for a surprise!
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Dan 2005 E320 CDI - 246k 1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k Past: 1987 300D - 264k |
#14
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thanks dan,that hose and valve looked pretty clear,cleaner blew right thru it.but i did unscrew that sender right above the hose i think u were talkin about and that had some splooge on it.thanks again .
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#15
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Jimmy L. '05 Acura TL 6MT 2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China" Scar engine installed '81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John |
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