I am sure by now everyone here knows I've been inducing HHO to my 1985 300SD. I know the question I am about to ask I'll get a lot of heat from asking it. but that's okay that's why I am here to get to know this car.

Anyway, I decided to increase the gas production on the generator onboard, from 1.5 lpm to 2.5lpm. The engine accepted it with great result both mileage, power and how the engine runs (at idle the engine barely shakes) even the air cleaner does not shake. the one thing that was noticable was the "post shutdown". The engine still runs for about a second or two.

What does that means when it does that? How can I prevent that?

The Vacuum Shutoff on the Fuel Injection Pump moves the Fuel Rack into the no Fue position and cuts off the Fuel.
If there is still something coming in with intake Air that can burn; an example of this would be Starting Fluid (is Fuel); it will/can burn in the Cylinders.

(You might want to go to an internet site like Wikipedia and review how a Diesel Engine ignites the Fuel.)

So your Engine is runing off of the HHO in the intake system during shutoff.

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84 300D, 82 Volvo 244Gl Diesel

I have the feeling with the increase production of HHO it is what's keeping it running. If that's the sole source for the engine doing that I can reduce the HHO output, but I like how the engine performs with the 2.5 lpm being induced.

I don`t know anything about your gas production or what effect it has on the engine. But as far as being slow for the engine shuting down, you either have a vacuum leak or the fuel cut off pod is getting tired.

Check the rubber connection at the back of the Injection Pump, make sure it is seated well and the brown vac line is seated into the hose.

The little round can at the back end of the IP is the fuel shut off pod. to check it, attach your Mity-Vac to it and see if it shuts the eng down quicker than the key. you can also attach a vac hose to it and suck on it.

Do you have problems with other vacuum consumers being slow to work? some times working around the oil filter housing, a vac line can be moved enough to leak. or one of the rubber "T" connections is old and leaking some.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

A quick test would be to shut off the HHO and see if the post shut down running stops. Didn't you think of that?

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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

To go along with what funola is saying. Shut off all of the HHC and drive the Car only on Diesel Fuel.
After, that if the car shuts down normal you know it is the HHC causing the issue.

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84 300D, 82 Volvo 244Gl Diesel

The last time it ran after shutdown, the 25 year old started decided to die on me. After I have it rebuilt I will disable the Hydrogen system and start there for Trouble shooting.

Okay, caught up with tasking and actually came home early with the new starter waiting to be installed. Starter installed, drove the car without any HHO, the car still kept running for a second or two after key is off. I changed all the small vacuum line being used as coupling, still the car runs after the key is off.

Where can I look next? I was wondering if the lenght of the tubing coming from the "Banjo" bolt is pre-dertermined, I mean what happens if it was cut short to remove some extra tubing.

Bad shutoff diaphragm or low vacuum ?

My 81 does the same thing but I have oil leaking into my ignition switch so my diaphragm is definitely bad. I have plenty of vacuum.

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Experience : what you receive 3 seconds after you really needed it !!



86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes

Okay, I drove the car for 30 minute or so last night. Another thing I noticed was the car shift faster and down shift hards during the entire drive. This morning drove it to work, it shut down as advertise. what gives? A gremlin is toying with me, will see if it does it again.

Go get a mighty vac and test your vacuum system
buy the metal one it is better
shut off and door locks are vacuum, the transmission has vacuum plumbed in there too, the a/c system has vacuum to open the vents
you can isolate the systems and check to see which is causing the problem
search "shut off" wont shut down etc...I bet it is your doorlocks. Mine is that way. I plugged the line to the door locks with a golf tee and now it shuts down right

Does the SD have vacuum door-locks or a separate vac/pressure system like the SDLs?

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Gone to the dark side

- Jeff

THe door locks on an SD are operated by a pump in the trunk, the shutoff is hooked into the engine vac system. Looks like it is down to good ol' vacuum troubleshooting for the OP. There are some great vacuum guides in the DIY resources on this site - I highly recommend taking a look at them.

As far as the HHO, I wonder what long term effects it will have on the engine? I know that starting fluid can seriously damage a diesel and considering the explosive nature of hydrogen, you'd be changing the combustibility characteristics (heat, pressure, etc.). I wonder if it is similar to using ether?

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

I am not familiar with what ether does to an ICE. The was trying to explain to a group of Highschool students of the affect of HHO, why is combust majority of the fuel during combustion process. The only thing I can easily explain is; It's like having thousands of igniter plugs during combustion to ignite all the fuel, instead of just having one with HHO you have thousands.

I will ask my group on the affect of ether so I can learn about something new, it's not something I've toyed with.

The door vacuum I will check and check vacuum system as well. The car shutdown normal this morning will see after work.

My info was incorrect sorry, looks like your system is different than mine.