300D Will not shut off
 

1985 300D

I did a search and still need help.

My car will not switch off. I can stop the car with the "Stop lever" but would like to fix the problem. I have read that the "solenoid" may be bad. The solenoid is silver and is on the injector pump right? It has two hoses coming out of it. one clear one black. In the search it said to test by covering the hose connection with your finger and pushing the stop lever. The clear connection or the Black connection? With the car running or off? What else could I try??

Please help

First check the vacuum lines for an abandoned connection. Then check the vacuum hose coming off the vacuum valve at the IP. If there's oil in that vacuum line, then the valve is suspect. While the engine is running apply suction on this line to try to shut off the engine. If you can't, replace this valve. Be very careful to do this correctly that it hooks onto the IP, otherwise you won't be able to turn off the engine and it will rev to the max and blow. If you can shut the engine off with suction, check the 2 vacuum lines that connect to the vacuum valve at the key switch. You may have to replace this valve. Good luck.

shutoff valve
 

your shutoff valve should be on the end of the injector pump between the IP and the oil filter housing, not on top of the IP. the shutoff valve has one vacuum line coming from it, should be brown with blue stripe, and a small rubber hose connection to the valve. check that small hose as it sometimes gets soft/oil filled and replace if necessary.

I would bet on a vac leak somewhere. I had the same problem a couple years ago, I could only shut down if I locked the doors (leak on the drivers door).

Thanks for your help, I'll look for a leak after work.

I was doing other work on the car when this problem came up, so I hope it is just an old hose that I hit.


I am looking at the white plastic thing at the end of the IP not the silver thing on top of the IP right?

The hunt goes on.

wish me luck

the shutoff valve is directly underneath the white plastic valve which is the trans vacuum control valve on the end of the IP.

Found control valve (with your help), used spot light to get a good look. Looks OK, pulled brown with blue hose and no oil inside. Went to other end at the key. That connection looks ok also. Car will still not stop.

What next??

I just replace main fuel filter, is this related??

Also saw under dash, a black hose that just ends. It comes from the "vacuum control valve" (the white plastice thing at the end on the IP).

i would check if there is vacuum coming from the brake booster line 'tee' that feeds the climate control and shutoff valve in the ignition switch. just pull the line and check with the engine on.
it is the line that goes to the yellow valve near the firewall.
the other 'tee' in the brake booster line will be feeding the trans vacuum valve on the IP. if there is good vacuum
you could isolate the shutoff 'circuit by disconnecting the lines going to the climate control and feeding directly the green striped line going to the inside of the car. then shut off the engine with the key. if that works then your shutoff valve is ok and you need to find a vacuum leak within the system.
the black line that justs 'ends' in the passenger compartment is normal it doesn't attach to anything.
changing the fuel filter has nothing to do with the shutoff (fortunately!!)

Thanks


"you could isolate the shutoff 'circuit by disconnecting the lines going to the climate control and feeding directly the green striped line going to the inside of the car. "

Feeding it directly from what? I am confused.

How do I test for "good" vacum? Tester or just putting your finger over the line? Sorry, I am new with diesels.

I'll take a better look at things after work and get back to you, thanks!

Go buy a MitiVac hand vac pump at the parts store. Costs about $35 and is worth every penny.

Once you have the pump, you have both a portable vac source and a gauge. Attach pump to the shutoff and pump down -- must hold vac indefinitely and must pull the stop lever down.

You must get at least 11" vac at the connection for the brown vac line on the main line between the vac pump (front of the engine) and the brake booster.

Most likely, if this suddenly appeared, you have dislodged the brown vac line from the main vac supply line.

The rubber connectors are probably all in questionable shape by now -- they either get soft and perforate or get rock hard and shrink, then get loose or crack and leak. The orifice in the connector can also get plugged, so you have no vac, or the plastic fitting can crack, causing a leak. The fitting in the main line isn't available separately, you must buy the whole line.

Get the MitiVac, it makes finding vac leaks easy. Note that a major leak anywhere can cause you trouble!

Peter

f johns- of course peter is giving you the ''right and true" solution above. my method is without using a vac pump. you put your finger over the line in the brake booster to see if there is vacuum.
if it is blocked the 'tee' can be drilled out carefully. dont go through the other side of the brake booster line!

to isolate the shutoff just hook up vacuum straight from the brake booster line to the green line going from the yellow valve near the firewall. that will eliminate any climate control functions but isolate the shutoff so you can test it.

good luck.

Follow this thread for more details and pictures:

http://www.peachparts.com/shopforum/diesel-discussion/16287-motor-engine-keeps-running.html

1st, thanks for all your help.

I feel stupid,you were right, is was a simple bad hose connection.

After some more poking around I found it and all is working fine for now. I see several bad hose connection whick I will replace soon.

Thanks for your help, I learned a lot about my "new" car.

I think I'll get a ninvac to help with these problems,

Time to enjoy the car