Cyl contribution test shows #3 & #8 bad?

[slopoe]

had a cyl contribution test done last wk before they did my cps it recall it showed cyl 3 bad i ordered 2 reman injectors just to have a spare had the test done again yest before i changed #3 and it showed that 3 & 8 were bad. i have been told a bad cps will cause this but just had recall done last wk. I have also been told 8 will show up falsely sometimes. My truck is an early 99 everything i have read says all 8 injectors are same is this true? and should i replace just 3 or 3 & 8?

[OregonStroker]

with three hundred k i would replace them all.

[slopoe]

Wish i could but cant afford it right now

[OregonStroker]

Well are they both on the same side?

[slopoe]

Nope not on a diesel 1 on each side

[ajpu1983]

Make sure to run a compression check in the unlikely event that a compression issue is causing the contribution code.

[caper01]

hi i had same problem on my 01 7.3l. i was told 3 and 8 bad so got them changed and same code came up. engine would come on under hard aceleration. replaced irp same thing. it was the hpop in the end changed that and all was good.

[slopoe]

The truck definately has a miss but after i drive the truck 20 miles or so the miss goes away alot of the time. injectors will be here monday lets hope that fixes it

[payne5757]

Any updates?