Running on 7 cylinders

powerstrokesmoke96 · #1 (**permalink**) 11-13-2012, 04:18 AM

What would cause my #3 cylinder to not fire? Tried a diff injector still runs the same. Tried a diff ficm still the same. Diff pcm still the same. I'm lost, any ideas?

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**southend** · #2 (**permalink**) 11-13-2012, 07:19 AM

Wiring harness. What codes do you get?

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dannyboy950 · #3 (**permalink**) 11-13-2012, 09:10 AM

Wireing or a actual cylinder problem. That said a valve problem would show up as popping thru the exhaust or intake. A broke ring [low compression] would only show up as a miss or excessive blow back, unscew the oil fill and see if it chuffs at ya.

**southend** · #4 (**permalink**) 11-13-2012, 09:39 AM

Quote:

Originally Posted by dannyboy950

Wireing or a actual cylinder problem. That said a valve problem would show up as popping thru the exhaust or intake. A broke ring [low compression] would only show up as a miss or excessive blow back, unscew the oil fill and see if it chuffs at ya.

We are thinking alike, thats why i'm wondering if he has any codes. :thumbup:

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powerstrokesmoke96 · #5 (**permalink**) 11-13-2012, 11:00 AM

That's what I thought also. So I swapped a motor I had in that only has 100000 miles. Still does it.

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dannyboy950 · #6 (**permalink**) 11-13-2012, 01:51 PM

Did you use the same harness?

**southend** · #7 (**permalink**) 11-13-2012, 01:53 PM

Quote:

Originally Posted by powerstrokesmoke96

That's what I thought also. So I swapped a motor I had in that only has 100000 miles. Still does it.

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So you changed a motor, and the harness may be bad?

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powerstrokesmoke96 · #8 (**permalink**) 11-13-2012, 02:40 PM

But I tried a diff injector harness on the other motor still ran like crap. It's the #3 cylinder on both motors its gotta be somthin electrical but I don't even know where to start

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powerstrokesmoke96 · #9 (**permalink**) 11-14-2012, 02:36 AM

I just don't understand how my ficm is good and the harness and pcm and still have that number 3 cylinder not fire on 2 different motors. I haven't drivin my truck in almost a month. It's sad to see it sit there. Does anyone have any ideas?

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**southend** · #10 (**permalink**) 11-14-2012, 04:33 AM

I think your going to have to dig deep into the harness. Do you have a monitor for live data? Any codes?

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