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  #1  
Old 03-30-2016, 10:38 PM
RDPChris RDPChris is offline
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Default Sluggish Start on Diesel, Great on Veggie

99 F350, 7.3
Sometimes starts and runs sluggish initially. Idles but bogs down when you hit the gas. Can sound a little rough. This does not happen all the time though. More often when cold.
Clears up and runs perfectly great when switched to Veggie either auto or manually. Of course it runs fine when brought to mechanic.
checked fuel pressure - fine. Haven't been able to catch it acting up.
checked fuel filter - fine
glow plugs and injectors are relatively new.
Anyone else seen this?
Any ideas?
Thank you in advance for your input.
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  #2  
Old 03-31-2016, 06:11 AM
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anii23 anii23 is offline
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Check to make sure it is purging properly
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  #3  
Old 03-31-2016, 02:29 PM
Clay Clay is offline
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Quote:
Originally Posted by RDPChris View Post
99 F350, 7.3
Sometimes starts and runs sluggish initially. Idles but bogs down when you hit the gas. Can sound a little rough. This does not happen all the time though. More often when cold.
Clears up and runs perfectly great when switched to Veggie either auto or manually. Of course it runs fine when brought to mechanic.
checked fuel pressure - fine. Haven't been able to catch it acting up.
checked fuel filter - fine
glow plugs and injectors are relatively new.
Anyone else seen this?
Any ideas?
Thank you in advance for your input.
It seems I recall a situation like this a while back with another member. IIRC it was a worn out injector issue??
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  #4  
Old 04-01-2016, 12:54 AM
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erbilabuc erbilabuc is offline
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what is your actual fuel pressure on diesel? I had similar problem last year to the point where truck would die while running on diesel. It was the poppet valve on pressure regulator was worn and not backing out putting my diesel fuel pressure at 100+ psi (gauge pegged at 100).
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  #5  
Old 04-02-2016, 10:19 PM
RDPChris RDPChris is offline
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Thank you for the info. I will double check those things. I think the pressure was good on diesel. We checked the fuel pressure and it was fine. I will double check to be sure though. Any thoughts on an electrical or solenoid type issue? maybe sticking? Thanks again. Will let you know.
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  #6  
Old 04-03-2016, 03:52 PM
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erbilabuc erbilabuc is offline
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you have a v3 correct? Only other thing I can think of is you are not burning all the veggie oil out at shut down or somehow you are starting on veggie oil?
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