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  #1  
Old 05-25-2006, 11:03 AM
R Leo's Avatar
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Strange Diesel Phenom at Start-up This Morning

Marlene the wonder wagon has been sitting for a couple of days and when I started her up this morning to head to the shop, the strangest thing happened. I glowed and cranked (the ususal thing) and she fired right off, ran smoothly (once again, typical) for a couple of seconds, then started missing out and died (NEVER, EVER done this!).

I glowed her again and cranked and she acted exactly like she had a bad GP...cranking but only trying to fire on 4 cyls instead of 5. I cranked for 8-10 seconds and then she fires off, with a slight miss on one cylinder which, after another 5-10 seconds cleared up. After that, she was idling smoothly; all was normal.

Behind the car, it was another story...this cranking and missing-out generated a HUGE inky black cloud of soot. Revving the engine made even more! After a trip around the block, she eventually cleared her pipes and was leaving the typical haze under hard acceleration. She restarted fine, with no indication of

Aside from three failed GPs causing hard starts over the last three years, this car has NEVER acted like this.

Here are the facts surrounding the situation:
Ambient Temp - 75F
Fuel - approximately 60% diesel, 40% WVO
Engine running fine at shut-down

Any guesses why this happened?

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Last edited by R Leo; 05-25-2006 at 02:44 PM.
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  #2  
Old 05-25-2006, 11:15 AM
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Sounds like you might have bled off your prime while sitting.
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  #3  
Old 05-25-2006, 11:24 AM
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Quote:
Originally Posted by TX76513
Sounds like you might have bled off your prime while sitting.
And that might be caused by a leaking hose or a bad primer pump? IIRC, the primer pump is the old style.
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Old 05-25-2006, 11:27 AM
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much easier to pull in some air if the fuel is thick. What was the temp last night?
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  #5  
Old 05-25-2006, 11:32 AM
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I was thinking along the lines of injectors. My Isuzu who gets driven once every few months leaks off at the injectors causing a terrible start up and lots of smoke But after about 30 seconds everything is fine and will continue to start normaly until it sets again.
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  #6  
Old 05-25-2006, 11:32 AM
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Bled off your prime means the same as a leaking injector? Or does it mean the fuel got back past the valve on the pump end of the fuel line? Or pump bled back internally somewhat? A possibility perhaps. Anyways it was a though of mine that sitting for a longer period than normal might have let an injector with a tiny leak dump the contents of the line into the cylinder. Not noticeable during frequent usage as very small leakdown. It might not then catch properly when the engine first started and engine might die out. And would it smoke. Of course you could have lost a couple of glow plugs or wiring/termination problems in the glow circuit might just produce a pretty well simular situation. Your description anyways is that engine had trouble getting rid of accumulated fuel. Or too much was available. Or engine would not ignite even the proper amount properly. Just some thoughts. Could of course be other things but a place to start perhaps? A typical response to something like this might be. If it starts and runs well tomorrow morning let dead dogs lie but expect simular behavior if you let your car sit for long periods next time as well.

Last edited by barry123400; 05-25-2006 at 11:46 AM.
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  #7  
Old 05-25-2006, 12:21 PM
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Quote:
Originally Posted by TX76513
Sounds like you might have bled off your prime while sitting.
yep my car will do the same after sitting for a week
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  #8  
Old 05-25-2006, 12:34 PM
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leaking prime pump

Leo,
My old-style primer pump lots is seal and leaked like a sieve after I tried to use it after a diesel purge. From what I saw the old primer pump was just looking for a reason to break. It was almost impossible to start after it started leaking. I replaced it w/ the new style (MUCH nicer) and all is well in that regard.

clint
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Old 05-25-2006, 01:13 PM
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I understand that the truely ingenious can bbuild a primer pump out of hay bales!

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  #10  
Old 05-25-2006, 01:56 PM
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No Mike.... it takes baling wire (preffered) or twine and some duct tape and maybe a little bit of bubble gum to make a primer pump.

My vote is that air somehow got into the fuel system somewhere.
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  #11  
Old 05-25-2006, 02:44 PM
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Quote:
Originally Posted by MikeTangas
I understand that the truely ingenious can bbuild a primer pump out of hay bales!

LOL! It certainly would be a well-insulated pump...
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Old 05-25-2006, 04:36 PM
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Quote:
Originally Posted by Wasuchi
No Mike.... it takes baling wire (preffered) or twine and some duct tape and maybe a little bit of bubble gum to make a primer pump.

My vote is that air somehow got into the fuel system somewhere.
(cue MacGyver theme music)
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  #13  
Old 05-26-2006, 02:24 AM
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Quote:
Originally Posted by R Leo
Behind the car, it was another story...this cranking and missing-out generated a HUGE inky black cloud of soot. Revving the engine made even more! After a trip around the block, she eventually cleared her pipes and was leaving the typical haze under hard acceleration. She restarted fine, with no indication of
with no indication of what? You cut it off.

Sounds like more than a GP to me. When I loose a plug or a cylinder misfires, it's usually grey when the engine is warm or white when cold. A black cloud sounds more like a stuck injector.
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  #14  
Old 05-26-2006, 09:05 AM
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Quote:
...with no indication of any other problems.
Sorry, my mistake.

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