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Old 06-18-2011, 04:03 PM
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HELP!! 1987 190d 2.5 non turbo won't shut off

I've just started working on my 1987 190D 2.5 non-turbo and from the get-go it did not want to shut off. Even when I first brought it home it would not turn off, so I called the seller and he said just stomp on the pedal after you turn off the key. That worked for a while, but now it won't shut off unless I take the air cleaner off and smother it with my hand. I bought a fuel shut off solenoid from euro parts direct that is vacuum, but it looks mine might be electronic. Is it located on the back of the fuel injection pump and could mine be electric instead of vacuum. Thats my guess, but I've never had a diesel before and I might be looking at the wrong part. I'm getting ready to produce some bio-diesel, so to be able to make my own fuel for $1.25 a gallon and get 33MPG is pretty hard to beat. I'm gtetting ready to put a hitch on the 190 and tow my boat this summer to Lake Powel, 600 miles round trip for about $20 in fuel. Now if I could convert my 85HP outboard to diesel! It will cost me $20 in gas just to get out of the harbor!
thanks in advance, hushpuppy

I did a little more surfing on the problem and found the shut off lever. Works great and I can live with that! There was discussion on the vacuum shutoff on the back of the distributor. Mine has electric to it and when disconnected it barely runs so it is doing something. Are there electrical fuel shut offs on some of these cars or am I looking in the wrong place? I've only seen the vacuum one listed. thanks again

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Old 06-18-2011, 06:01 PM
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All shutoff actuators of that vintage operate on vacuum. Whether vacuum is supplied by a mechanical valve at the key switch or an electric switchover valves varies by year and model. Follow the vacuum line, probably brown with a red stripe, from the engine shutoff actuator atop the injection pump. It'll either go through the firewall in which case there's a mechanical valve at the key switch, or it'll go to a small black box with wire connections in which case it's an electric switchover valve.

Sounds like the actuator atop the injection pump is tired if there is some effect but not enough choking to kill the engine. That's my guess, anyway.

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87 300D
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Old 06-19-2011, 05:13 AM
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Sounds like you're leaking vacuum somewhere, or the shutoff valve is shot. This same thing started to happen on my W126. But be VERY aware of the possibility of a runaway engine. I replaced the shutoff valve and the engine subsequently ran away, cracking that beautifully made #14 head. That is one scary thing to watch..
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Old 06-19-2011, 10:47 AM
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The vacuum valve at the ignition will be my next item to visit. I did find and change the shutoff valve on the pump, but there was nothing wrong with the old one. I've also envisioned a push button stop with an electrical solenoid if it is I can't fix the vacuum problem easily. There has to be 500 miles of vacuum lines on that car!
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Old 06-19-2011, 02:13 PM
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Quote:
Originally Posted by hushpuppy View Post
The vacuum valve at the ignition will be my next item to visit. I did find and change the shutoff valve on the pump, but there was nothing wrong with the old one. I've also envisioned a push button stop with an electrical solenoid if it is I can't fix the vacuum problem easily. There has to be 500 miles of vacuum lines on that car!
Trouble shooting by replacing parts will become expensive.

You could simply have bought a piece of Vacuum Hose; stuck it on the Vacuum Shut Off Valve and sucked on the other end of the Hose. If it shut off the Engine doing that the Vacuum Shutoff Valve is OK.

The 500 miles of Vacuum Tubing would be easier to sort out if you had the Factory Service Manual to tell you the Color Coding of the Vacuum Tubings.

Time to invest in a Hand Held Vacuum Tester. I have owned a Metal Actron one since the 1980s and it has survived falls and other occasional abuse (why I advise against the ones made of plastic).
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Old 06-19-2011, 03:44 PM
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Its probably the vac hose going to the firewall from the IP and entering into the car ,I knock mine off changing the oil filter all the time .If not check the rubber pieces for cracks if they are aged ,they can look good but twists and bend them to see if theyll need replacing ,good luck.

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