Good evening all.

1978 240D manual trans.

I noticed that there are two hose barbs on this car with no hoses attached. One seems to be a sensor in the thermostat housing on the upper passenger side of the engine and the other is a round canister type thing on top of the IP.

Should they have hoses, and if so where should they connect to? I checked the sticky vacuum diagram posts but couldn't find the info for this car.

Would either of these contribute to difficult starting?

Thanks

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Dropout

1978 240D work in progress

is generally bad glow plugs, low compression or a fuel problem = excess/lack of.

Best advice:
#1. Adjust your valves.
There are many threads on valve adjust, it is not a tough DIY.
#2. Check for power to glow plugs and replace any bad ones.
This thread may help.
Glow Plug Testing?
#3. Replace fuel filters and repair any fuel leaks.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

id like to know what hooks to the connection on the silver canister on top of the ip-- my car has nothing connected to it!

the part i am talking about looks almost exactly like the mechanical fuel pump on an old vw.

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http://i68.photobucket.com/albums/i1...Untitled-1.jpg

Nothing hooks there I don't believe.

__________________
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

I would suggest a separate thread + year, make, model.

Wild guess:
240D without turbo, the device will be atmospheric pressure compensation valve.
A picture would really help.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

I think the 82 240D vac diagrams apply here as well. From looking at this diagram (sticky) and my own 82 240D, I believe the thermostat housing sensor actually controls the egr. I've disabled egr, and taken out all the vacuum lines related to it.

I think the round thing atop the ip is the "vacuum control valve"--it should have a green "surge damper" connected to it, and from there, link to the vacuum supply (big line going from vacuum pump to brake booster).

I don't believe either of them are related to starting.

Good luck.

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J. S. Park

'82 240D Manual 240D (sold)
'83 300D-T 230k (sold)
'84 300D-T 118k (sold)

The cannister on top of the IP is the altitude compensator and should not have anything connected to it. I don't know about the passenger's side of the engine. The 82 diagrams don't really apply, as there were a lot of changes between 79 and 80, and again in either 81 or 82 when they added EGR.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

Thanks everyone.

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Dropout

1978 240D work in progress