Cylinder Contribution Help

[hopkins.phillip]

just when i think i have the truck all lined out Cylinder Contribution test shows fault on cylinder's 2, 3, 5, & 7. Whats the most common problem to cause a cylinder to fail.

I've just replaced UVCH and pigtails on both sides, FPR (mine cracked), IDM, GP's & GPR, and put a new International CPS on today. Truck runs good although it does have a slight miss/hesition under a load and if you floor it from a low RPM. Any help would greatly be appreciates. Trucks a 96 CC SWB 4X4 Auto with 396k

[hopkins.phillip]

bump, no one? any recommendations at all?

[deezelfromRofo]

Recheck all of your pigtails. Check your wiring again. You might want to pull valve covers and make sure none of your wires are touching anything causing them to rub and short out.

[hopkins.phillip]

buzz test comes back clear, with the international cps and engine temp not as warm the cylinder contribution came back 1-7 failed only #8 passed. gonna get the engine warmer and try again tomorrow, depending on results i may have the compression checked out before i go any further

[slandry786]

I have read that readings like that can be a heads up your idm is going out just somthing to check into

[hopkins.phillip]

just replaced IDM after trying to fix a bank 1 high side open code, done UVCH's on both sides, pigtails, GP's, GPR, and finally IDM only done GP's since i was in the valve covers

[slandry786]

sorry missed that in the first post I would have to agree recheck all your wiring some times wiring problems can be almost inposable good luck

[hopkins.phillip]

only codes that keep popping up is:
truck not in park or neutral
boost sensor (progrmmer)
internal ROM error

anyone know what size adapter is needed to do a compression check, i take it a compression check is done through the glow plugs