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-   -   Motor rocking (http://www.competitiondiesel.com/forums/showthread.php?t=200220)

GreasemonkeyHd 05-20-2018 04:11 PM

Motor rocking
 
I have a 190hp p pump industrial motor out of a 92 blue bird in my first gen with a d max intercooler in front of it. It might have the original injectors from 92 in it which I'm thinking may be the culprit but anyway to the point. I firemy motor up cold and it purrs smooth for about 15 seconds or so then starts rocking side to side. It runs great and seems to smooth out after it hits 1500 rpms on up ( I'm only guessing on rpm because I don't have a tach) I can't seem to figure out how to post a vid on here, just looking for opinions and input much appreciated!

95cummins5.9 05-20-2018 05:32 PM

Air in fuel probably

GreasemonkeyHd 05-20-2018 07:06 PM

Quote:

Originally Posted by 95cummins5.9 (Post 2668733)
Air in fuel probably

It has ran the same way since it was in the bus. The feed and return lines are brand new

95cummins5.9 05-20-2018 07:28 PM

Ok, have you done simple stuff like check the fuel pressure, could be a bad overflow valve. Ran the valves? How about verifying the injection timing?

GreasemonkeyHd 05-20-2018 08:34 PM

Valves we're the first thing I ran through. Ive been trying to trade glo shift pillar gauge set for a fuel pressure gauge so I could check my pressure. I have a raptor rp 100 lift pump on it now because I thought the piston lift pump may have been the problem but it wasn't.

GreasemonkeyHd 05-20-2018 08:36 PM

Never checked the timing though wish I would've checked it when I tabbed the dowel pin

95cummins5.9 05-20-2018 08:49 PM

Is it hazing? Maybe shoot each cylinder with a infrared gun and narrow it down.

blackmega3500 05-20-2018 08:57 PM

I'll say from experience when I had a dirty sticking /leaking nozzle on my #3 injector it did exactly as you described until warm. Pulled that injector apart, clean and soaked it over night reassembled and pixed it right away.

Was misfiring so bad at low rpm felt like the truck was driving over speed bumps.

GreasemonkeyHd 05-21-2018 11:14 PM

Quote:

Originally Posted by 95cummins5.9 (Post 2668753)
Is it hazing? Maybe shoot each cylinder with a infrared gun and narrow it down.

Hazes when cold but is clean after she's warmed up

GreasemonkeyHd 05-21-2018 11:16 PM

Quote:

Originally Posted by blackmega3500 (Post 2668754)
I'll say from experience when I had a dirty sticking /leaking nozzle on my #3 injector it did exactly as you described until warm. Pulled that injector apart, clean and soaked it over night reassembled and pixed it right away.

Was misfiring so bad at low rpm felt like the truck was driving over speed bumps.

It seems to get worse when warmed up and not as bad when cold. I wish I could figure out how to post a vid

blackmega3500 05-22-2018 01:26 AM

Quote:

Originally Posted by GreasemonkeyHd (Post 2668939)
It seems to get worse when warmed up and not as bad when cold. I wish I could figure out how to post a vid

Download to a YouTube acct then post link.

GreasemonkeyHd 05-22-2018 08:30 AM

Quote:

Originally Posted by blackmega3500 (Post 2668949)
Download to a YouTube acct then post link.

Gotcha I'll try to get one up today

GreasemonkeyHd 05-25-2018 05:12 PM

P pump cummins motor rocking - YouTube


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