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#16
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84 300SD - bought in April '06 with 237,000 mi |
#17
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The rack controls the injectors. Just move the "throttle" linkage from idle toward maximum power and the rack will move to provide more fuel to the engine. We don't call it "throttle" because a diesel engine is not throttled.
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#18
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Which MityVac did you get? Question for others--What mode of MityVac is suited to do this job? Would this one do it or do you have to have the 0400 model? Is there a recommended place to get one? Thanks in advance! http://www.amazon.com/Mityvac-7000-Automotive-Tune-Up-Bleeding/dp/B000BPFB3A/ref=pd_bbs_sr_1/104-9001271-1222314?ie=UTF8&s=automotive&qid=1188520535&sr=1-1
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1998 E300D, 287k, barely broken in. |
#19
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The plastic one seemed kind of flimsy when I was shopping for one. I ended up buying the metal one.
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1984 300TD |
#20
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in 20 sec - it is down to 11.0 mm Hg in 1 min - down to 10.0 in 1 min 45 sec - down to 9.0 in 2 min 35 sec - down to 8.0 in 4 min - down to 7.0 I did do this test nonetheless, and it behaves exactly like you described it should - losing vacuum in-sync with the rack movement.
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84 300SD - bought in April '06 with 237,000 mi |
#21
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So, if the transmission is still exhibiting the characteristic clunking and very firm shifts.........we need to see if an adjustment to the VCV or the modulator is in order. Disconnect the vacuum line to the transmission and connect the Mityvac. Run the hose into the cabin. Pump up the Mityvac to 15" and keep it there (give it a squeeze every so often as it falls). Now drive the vehicle and see if the hard shifts disappear. Make sure the Mityvac stays between 12" and 15" during this test. |
#22
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Quote:
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84 300SD - bought in April '06 with 237,000 mi |
#23
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Quote:
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1984 300TD |
#24
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You are using mity vac instead of the car's vacuum system to feed the trann'y modulator. This is only for testing. If the tranny shift nice and smooth through all gears, then the problem lies elswhere.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#25
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That's what I assumed and did - I connected the Mityvac into the T-junction, in place of the line from the vacuum pump. I ran the line into the cab.
Wow, I had to pump the Mityvac hard, pretty much all the time to keep up with the modulator during accelerations and such. The shifts did feel a good bit smoother, although not seamless - probably because my hand couldn't keep up with the demand for vacuum all the time. I didn't hear clunking, but I didn't drive around a whole lot like this either - my hand was about to kill me. Also a thing to keep in mind - my shifts are generally much smoother on hot engine/tranny than during the first drive in the morning.
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84 300SD - bought in April '06 with 237,000 mi |
#26
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The test failed because the VCV leaks far more vacuum than you can possibly pump with your hand. The modulator doesn't. So, repeat the test with the proper connections..........I want to see if the modulator will respond with higher vacuum levels. |
#27
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In the pic, the mityvac is not connected to the T junction, it's connected to the line which goes into the T junction.
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1984 300TD |
#28
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I'm following .....
...... this too. thanks, BC.
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the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth... 2007 Honda Accord EX 2007 Honda Accord SE V6 96 C220 97 Explorer - Found Another Home 2000 Honda Accord V6 - Found Another Home 85 300D - Found Another Home 84 300D - Found Another Home 80 300TD - Found Another Home Previous cars: 96 Caravan 87 Camry 84 Cressida 82 Vanagon 80 Fiesta 78 Nova Ford Cortina Opel Kadet 68 Kombi Contessa |
#29
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Thnks for this Brian, I have the same problem and this step by step troubleshootig guide your creating is going to be very helpful.
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I'm sick of .sig files |
#30
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Maybe this can be turned into a step by step diagnosis with pics for the DIY Articles section?
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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