97 ram 360 4x4. Ive tried eveything i know to fix tjis issue. Misfire seems to be a common prob on these trucks. I bought the truck. Soon after arough. I first thought plentum then cracked heads. I wiggled the wiring harness and the idle improved so did the od shake. I ohmes the injectors then replaced for safe messure. Now it runs smooth with a cylinder five misfire and a o2 high voltage. Running real righ i assume to comp. My thoughts: 1. Faulty pcm 2. Bad cat. 3. Harness fault. 4. Clogged fuel rail.

 

If it's a consistent misfire on one cylinder then something is up with that one particular cylinder (bad valve, plug, wire, injector) Which oxygen sensor is running at high voltage?

 

[QUOTE=petea216;2972629]If it's a consistent misfire on one cylinder then something is up with that one particular cylinder (bad valve, plug, wire, injector) Which oxygen sensor is running at hi

Post cat

 

[QUOTE=Ramman98;2972759]How many miles on truck? Probably need to consider replacing O2 sensors and see if cat is clogged. So did you check the plenum....the correct way?

 

[QUOTE=gdstock;2972775]I used a vacuum gauge. All factory specs. Ohmed the injectors and replaced for good messure and did a tune up. The truck has 220k. The cat has been punched. I think thats the high voltage. the timing is jumping on the scan tool. Could it be a pickup coil

 

[QUOTE=Ramman98;2972799]Im also thinking about pulling the 360 and dropping in a 98 5.2

 

Pickup coil has nothing to do with ignition timing. Cranks sensor handles that.

 

[QUOTE=Ramman98;2972800]why would you go backwards? 360's are better in every way!

 

Sorry, but you wasted money replacing the injector that passed the Ohm test *unless* the injector has a clogged inlet and was therefore not operating properly.


You need to break this down into a step-by-step process to properly troubleshoot the issue rather than replacing parts in a wanton fashion.

 

+1! And check the plenum the correct way.