cylinder 8 miss fire

5

Asked by Jan 07, 2017 at 06:17 PM about the 2005 Dodge Ram 1500 SLT Quad Cab SB 4WD

Question type: Maintenance & Repair

I have an 05 ram 1500 5.7 hemi I have a miss on
cylinder 8 changed injector and coil swapped plugs  
did injector pulse test with scanner checked spark
checked compression it's 125-130 psi still missing
any ideas

3 Answers

87,045

Looks like you have covered what they say to do except that there may be an intake leak. Look for any type of vacuum leak, and try snugging up the intake bolts. One other thing is what is the compression in other cylinders? Between all the cylinders they say compression should not vary more that 15% from between the cylinders. If it does then it sounds like a miss.

1 people found this helpful.
67,765

What was compression on the other cylinders? The 125 to 130 reading may be a little low. Is there any ticking at the valve cover on that side of the engine. Have you checked to see if the push rod is bent or if the valve spring is broken?

1 people found this helpful.
81,335

I agree on the compression. Around 150 PSI or higher is usually about normal. 125-130 PSI sounds low to me. HTH. -Jim

1 people found this helpful.

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