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#1
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Ignition failure; vaccuum pump - leaky diaphragm? Is this right or wrong?
I just had the classic ignition failure - when I shut off the car, it continues to run until I pop the hood and shut it off manually. At the same time I believe it happened, I was driving and my A/C suddenly stopped coming from the center dash vents and went to the defroster vents - also a sign of vaccuum failure, I think.
I took it to my mechanic and after he showed me the vaccum line cap covered in black oil (I'm not sure whether it's motor oil, diesel, or WVO) he said that the air/vaccuum pump diaphragm has failed and is leaking into the vaccuum lines. He told me to go get a new pump diaphragm and he will install it for me and clean out the vacuum lines to the ignition. Does this sound like an accurate diagnosis and solution? If so, where would be the best place to get the necessary diaphragm? Thanks for the help!
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Autos: 1991 350SD 276,000 miles 2001 VW Beetle TDI 115,000 miles Horns: 1955 Selmer Mark VI Alto (55,xxx) 1958 Selmer Mark VI Tenor (85,xxx) 1964 Selmer Mark VI Tenor (125,xxx) 1967 King Super-20 Tenor (430,xxx) 2002 Selmer Series III Soprano For Jazz Saxophone enthusiasts - check out my website... www.RustyBlevins.com |
#2
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If the vacuum pump fails, the engine won't shut off. The key switch ports vacuum to the inj pump diaphragm when the key is in the OFF position.
How do the brakes feel? Does it feel like you have no power assist? If you feel like the brakes are hard to push then the pump is Ka-Put. Which line does the mechanic see oil in?
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle. |
#3
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There is no diaphragm in your pump, so I would question your mechanic's ability. If you have adequate vacuum, I would expect its the diaphragm on the vacuum shutoff on the back of the IP that has failed.
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??) |
#4
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Quote:
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If it is the diaphragm on the vaccuum shutoff on the back of the IP, how difficult/expensive is that to repair? What might have caused it to fail? Could hot (too hot) WVO cause a problem like this? I am running a Greasecar system with a VegTherm Mega, so my WVO is pretty darn hot - add that to driving in stop & go traffic with A/C, so my engine temps were pushing 100C - the WVO is heated by the coolant plus the VegTherm, so I'm sure it was very hot.
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Autos: 1991 350SD 276,000 miles 2001 VW Beetle TDI 115,000 miles Horns: 1955 Selmer Mark VI Alto (55,xxx) 1958 Selmer Mark VI Tenor (85,xxx) 1964 Selmer Mark VI Tenor (125,xxx) 1967 King Super-20 Tenor (430,xxx) 2002 Selmer Series III Soprano For Jazz Saxophone enthusiasts - check out my website... www.RustyBlevins.com |
#5
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If its black it's oil. Again which line has oil in it? If it is the main vac line and all the other lines then the check valve on top of the vac pump is bad. The check valve is right where the main vac line bolts onto the vac pump. If the oil is only in the ignition lines than your shut-off valve is bad, and you'll need a new one.
I don't think the pump is bad because if it were you would have hard breaks, and the door locks wouldn't work. And the oil in the lines definetly points to either the check valve in the vac pump or the shut-off valve.
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Andrew '04 Jetta TDI Wagon '82 300TD ~ Winnie ~ Sold '77 300D ~ Sold
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#6
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There is a diaphragm in the pump if its an early (pre 80s) W123 which can be purchased from the parts dept here, they come in a "kit' which is not expensive.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#7
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Right on this site.......from Roy or or Phil. Click "buy parts" at the top of the page. Anytime........ |
#8
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John
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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! |
#9
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From what I recall, you are probably correct.........the 60x pumps can't be easily rebuilt. |
#10
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not really Brian- his mechanic told him to replace the diaphragm on the vacuum pump to fix a shutoff problem
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??) |
#11
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Well, if that's what he meant.........then he's mistaken. Somehow, I think it's a terminology problem.........cannot fathom how he'd conclude you could replace a vacuum pump diaphragm on a 60x engine??
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#12
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Photos of offending vaccuum line...
Here are a couple photos of the leaking vaccuum line. The cap is new because the old one was loose, soft, and covered in black oil - my mechanic replaced it hoping to correct the problem, but obviously it did not work.
The A/C venting also went out at the same time - while driving before the shut-off failure, all the A/C suddenly went to the defrost vents. Does that help diagnose the problem? Would a failed shut-off valve affect the A/C vents, too?
__________________
Autos: 1991 350SD 276,000 miles 2001 VW Beetle TDI 115,000 miles Horns: 1955 Selmer Mark VI Alto (55,xxx) 1958 Selmer Mark VI Tenor (85,xxx) 1964 Selmer Mark VI Tenor (125,xxx) 1967 King Super-20 Tenor (430,xxx) 2002 Selmer Series III Soprano For Jazz Saxophone enthusiasts - check out my website... www.RustyBlevins.com |
#13
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#14
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Vacuum
I thought that your model has an electric vacuum pump that takes care of the doors and the trunk and fuel door lock so you can't use those systems to judge your engine/ignition vacuum. The best test is really a mityvac and see if you have more than 18 inches of vacuum on any of the outlets on the main engine vacuum pump to brake booster hose... if you do then it is possible that you have a vacuum leak feeding your AC vents, ignition and maybe other problems with the shutoff.... check the main vacuum line to see if you have any oil in it
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James A. Harris Last edited by jim16671836; 06-01-2007 at 10:33 PM. Reason: added information |
#15
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Otherwise, where should I start looking for the large vaccuum leak, and how?
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Autos: 1991 350SD 276,000 miles 2001 VW Beetle TDI 115,000 miles Horns: 1955 Selmer Mark VI Alto (55,xxx) 1958 Selmer Mark VI Tenor (85,xxx) 1964 Selmer Mark VI Tenor (125,xxx) 1967 King Super-20 Tenor (430,xxx) 2002 Selmer Series III Soprano For Jazz Saxophone enthusiasts - check out my website... www.RustyBlevins.com |
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