2008 Ram 1500 4.7 intermittent misfires multiple cylinders

Asked by Auto Feb 05, 2024 at 03:53 PM about the 2008 Dodge RAM 1500 SLT Quad Cab LB RWD

Question type: Maintenance & Repair

Just bought a tired old truck to support remodel project. 218k miles. Appears
all original, no leaks, good oil pressure, good temp, starts right up, idles,
does not smoke, no hot cats smell.  Lots of P codes, lots of misfires,
sluggish, hard to get over 40mph, have driven about 60 miles on 3 road
tests. CPS is good. Cleaned throttle body with TB cleaner. Replaced plugs,
checking each cylinder for compression and inline spark tester with the new
plugs (all were good, cyls 120-150psi), good fuel pressure, but proactively
replaced all injectors. No change in performance after any of this work.  
Wondering what to check next?

1 Answer
202,345

Ed92626 answered 2 months ago

Just d diagnostics, starting with trouble codes. On an old beast like this, I'd suspect that there's a lot going on, so address one code at a time. It's tedious work.

Mark helpful

Your Answer:

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