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  #1  
Old 07-18-2008, 05:12 PM
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84 300d hard start warm

I just got the car.

The engine sounds and drives very good; smooth and quiet, scored really great on emissions, %3 opacity.

The problem: when warm, if I shut it off for more than a few seconds it won't start, like it's not getting air; egr maybe?

If I wait for about 15 minutes, It will then fire just fine with a bump of the key.

I figured out, through necessity, that I could repeatadly bump the key to get a start after 5 or 10 bumps, but had very little power with that method, (lack of turbo?).

this sound familiar to anyone?
thanks
first post

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Old 07-18-2008, 07:29 PM
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anyone?
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  #3  
Old 07-18-2008, 09:15 PM
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You need air, fuel, heat and cranking speed to start these puppies. You should have enough air and heat so that leaves fuel and cranking speed. Check these two items out making sure you don't suck air in the fuel line and that the starter doesn't slow down when warm.
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  #4  
Old 07-19-2008, 12:53 AM
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I tihnk it's air related

Quote:
Originally Posted by MB-Owner-in-ind View Post
You need air, fuel, heat and cranking speed to start these puppies. You should have enough air and heat so that leaves fuel and cranking speed. Check these two items out making sure you don't suck air in the fuel line and that the starter doesn't slow down when warm.
I run wvo in the car, so I am all over the fuel.
no leaks, nothing wrong with the ip. I suppose there could be a lift pump problem that I haven't considered.

It is only when warm and only for about 10-15 minutes after shut down. then it starts and runs nice and tight like before.

And thats why I think there is something cutting off the air. do these have an anti shudder valve? or and air cut off mechanism to protect from runaway engine that could be malfunctioning? does the egr on these act as an air cut off for smooth shut down? maybe it is sticking till it cools a bit. is this not common?
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Old 07-19-2008, 01:14 AM
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Your 617.952 engine should have nothing but the air filter in the way of the air coming in to the engine. There is an EGR valve (if you have not removed it) but it should not affect starting at any time. There are no "anti shudder" valves, whatever they are.

We have had a number of people lately with starting problems; the common thread in all seems to be WVO or some other kind of "alternative" fuel.
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Old 07-19-2008, 01:15 AM
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I have a Federal 300D and it is easy disconnect the EGR to rule that out as a source of problems.
The next time your engine is good and hot stop the car open the hood and carefully pull off the vacuum hose that goes to the Fuel Injection Pump Vacuum shutoff; deactivating the Vacuum shutoff.

Try starting your car. If your car starts normally there is a good chance that that you have a vacuum problem somewhere in the system that is not allowing the vacuum to bleed off from you Vacuum Shutoff keeping it in the OFF position.
If you have the Factory Manual look in the section where the Ignition Switch Lock is. There is a picture there that shows the vacuum valve that shuts off your engine connected to the ignition switch. I am guessing that there could be a possible source of the problem..

As far as a device that protects the engine from running away; the Governor inside of the IP is supposed to keep it from revving at an unsafe speed by cutting back on the fuel at high rpms (assuming no one has messed with the adjustment); but it is still will rev high enough that it is scary when the engine takes off.
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Old 07-19-2008, 04:54 AM
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an old gas pickup of mine was like that turned out to be a tired starter that had to cool down
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Old 07-19-2008, 01:14 PM
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Quote:
Originally Posted by Jeremy5848 View Post
Your 617.952 engine should have nothing but the air filter in the way of the air coming in to the engine. There is an EGR valve (if you have not removed it) but it should not affect starting at any time. There are no "anti shudder" valves, whatever they are.

We have had a number of people lately with starting problems; the common thread in all seems to be WVO or some other kind of "alternative" fuel.
it was like this before I used wvo.
the starter turns fine. the fuel pumps fine. I'll find the answer and let you know.

anti sudder valves are part of many new egr valves. they close off the air supply on shut down to prevent the engine from shuddering to a stop.
they also allow you to turn the engine off with the key in the event of a runaway.
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  #9  
Old 07-19-2008, 01:16 PM
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Quote:
Originally Posted by Diesel911 View Post
I have a Federal 300D and it is easy disconnect the EGR to rule that out as a source of problems.
The next time your engine is good and hot stop the car open the hood and carefully pull off the vacuum hose that goes to the Fuel Injection Pump Vacuum shutoff; deactivating the Vacuum shutoff.

Try starting your car. If your car starts normally there is a good chance that that you have a vacuum problem somewhere in the system that is not allowing the vacuum to bleed off from you Vacuum Shutoff keeping it in the OFF position.
If you have the Factory Manual look in the section where the Ignition Switch Lock is. There is a picture there that shows the vacuum valve that shuts off your engine connected to the ignition switch. I am guessing that there could be a possible source of the problem..

As far as a device that protects the engine from running away; the Governor inside of the IP is supposed to keep it from revving at an unsafe speed by cutting back on the fuel at high rpms (assuming no one has messed with the adjustment); but it is still will rev high enough that it is scary when the engine takes off.
thanks I'll give that valve a check, sounds most likely from here.
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  #10  
Old 07-19-2008, 01:52 PM
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you were right Diesel911, that valve was da ting.

Now I have to figure out why it doesn't release vacuum when it is supposed to.

Any idea there?

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