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Old 05-20-2018, 03:11 PM   #1
GreasemonkeyHd

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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!
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Old 05-20-2018, 04:32 PM   #2
95cummins5.9
 
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Air in fuel probably
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Old 05-20-2018, 06:06 PM   #3
GreasemonkeyHd

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Quote:
Originally Posted by 95cummins5.9 View Post
Air in fuel probably
It has ran the same way since it was in the bus. The feed and return lines are brand new
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Old 05-20-2018, 06:28 PM   #4
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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?

Last edited by 95cummins5.9; 05-20-2018 at 06:30 PM.
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Old 05-20-2018, 07:34 PM   #5
GreasemonkeyHd

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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.
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Old 05-20-2018, 07:36 PM   #6
GreasemonkeyHd

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Never checked the timing though wish I would've checked it when I tabbed the dowel pin
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Old 05-20-2018, 07:49 PM   #7
95cummins5.9
 
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Is it hazing? Maybe shoot each cylinder with a infrared gun and narrow it down.
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Old 05-20-2018, 07:57 PM   #8
blackmega3500
 
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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.
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07.5 6.7l Mega-longbed conversion dually with 22.5s
EFI by ATP in Idaho, s364.5sxe/FI ETR s488 with V2 cover, s&s 135% overs, Hamilton springs/ pushrods and 188/220, suncoast Comp68 getting it all to the ground.

2014 BMW X6 ///M factory 560hp twin turbo AWD
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Old 05-21-2018, 10:14 PM   #9
GreasemonkeyHd

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Quote:
Originally Posted by 95cummins5.9 View Post
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
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Old 05-21-2018, 10:16 PM   #10
GreasemonkeyHd

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Quote:
Originally Posted by blackmega3500 View Post
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
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Old 05-22-2018, 12:26 AM   #11
blackmega3500
 
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Quote:
Originally Posted by GreasemonkeyHd View Post
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.
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07.5 6.7l Mega-longbed conversion dually with 22.5s
EFI by ATP in Idaho, s364.5sxe/FI ETR s488 with V2 cover, s&s 135% overs, Hamilton springs/ pushrods and 188/220, suncoast Comp68 getting it all to the ground.

2014 BMW X6 ///M factory 560hp twin turbo AWD
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Old 05-22-2018, 07:30 AM   #12
GreasemonkeyHd

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Quote:
Originally Posted by blackmega3500 View Post
Download to a YouTube acct then post link.
Gotcha I'll try to get one up today
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Old 05-25-2018, 04:12 PM   #13
GreasemonkeyHd

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P pump cummins motor rocking - YouTube
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