Smooth idle/ slight miss in higher rpms - Competition Diesel.Com

Jl12valve · 06-18-2017, 04:15 PM

Here's the story,
A while back I tore the motor down and fixed some things. Was going to bench the pump but ended up not so I put it back on. Timed it via the timing pin and tdc pin. On first start up it ran fine but missed badly while revving. Bumped timing and it seemed to help out quite a bit. It has a new fass 125 and freshly popped injectors.
Can it be that when I set timing the first time it was much lower than stock? The second time I timed it I used the kit and bumped it 7 degrees. I thought that would be 19.5 degrees at that point. Any other suggestions would be much appreciated.
It's got the 160 pump also.

blackcloudCTD95 · 06-18-2017, 07:02 PM

Does it sound like a machine gun out the tail pipe? My old 95 sounded like that come to find out 3 injectors didn't match the other 3.

tornado112 · 06-20-2017, 05:22 PM

might be de fueling what is the fuel pressure

jasonc · 06-20-2017, 05:51 PM

It sounds exactly like it needs more timing, how does it run under a load.

06-18-2017, 04:15 PM	#1
Jl12valve Name: Jl12valve Title: unfaithful CF user Status: Not Here Join Date: Jun 2014 Location: Waterford, Ca Member`s Gallery Posts: 567	Smooth idle/ slight miss in higher rpms Here's the story, A while back I tore the motor down and fixed some things. Was going to bench the pump but ended up not so I put it back on. Timed it via the timing pin and tdc pin. On first start up it ran fine but missed badly while revving. Bumped timing and it seemed to help out quite a bit. It has a new fass 125 and freshly popped injectors. Can it be that when I set timing the first time it was much lower than stock? The second time I timed it I used the kit and bumped it 7 degrees. I thought that would be 19.5 degrees at that point. Any other suggestions would be much appreciated. It's got the 160 pump also. __________________ ‘39 service truck build

06-18-2017, 07:02 PM	#2
blackcloudCTD95 Name: blackcloudCTD95 Title: Too Much Time Status: Not Here Join Date: Oct 2007 Location: south Fl Member`s Gallery Posts: 754	Does it sound like a machine gun out the tail pipe? My old 95 sounded like that come to find out 3 injectors didn't match the other 3. __________________ 98 qclb 5x14, 191's , benched pump to 425cc , 4k , 23* head studs , valve springs , hx35/sxe366 compound kit. built trans

06-20-2017, 05:22 PM	#3
tornado112 Name: tornado112 Title: Too Much Time Status: Not Here Join Date: Apr 2011 Location: The Great Garden State Member`s Gallery Posts: 290	might be de fueling what is the fuel pressure __________________ 94 Regular Cab Intake 5x12 Contagious Injectors 4kGSK and 60lb springs Adjustable Pump Gear and Timing Cover Auto Meter Steering Box Brace Sphon Adjustable Trac Bar Sphon Sway Bar Links Vision 19.5 Michelin 265-75-19.5 MegaTREK

06-20-2017, 05:51 PM	#4
jasonc Name: jasonc Title: Too Much Time Status: Not Here Join Date: Nov 2009 Member`s Gallery Posts: 4,412	It sounds exactly like it needs more timing, how does it run under a load.