04 hemi loosening power underload?? - Hemi Truck Club
 
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Old 02-01-2015, 07:35 PM   #1
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04 hemi loosening power underload??

I have a 04 2500 hemi yesterday it would loose power
Underload like going up hill
like it's not running on all cyl. If you drive in 2nd gear it's fine
When idling it goes all over the place 300-1200rpm.
Any ideas? About ready for a old cummins.

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Old 02-01-2015, 08:11 PM   #2
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When was the spark plugs last changed? TB removed and cleaned? Air filter? What codes are you getting?
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Old 02-01-2015, 08:15 PM   #3
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odd. rpm jumping and lack of load power sound like a fuel issue or catt issue. any codes?
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Old 02-01-2015, 09:00 PM   #4
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Plugs were changed 10k ago just cleaned tb
Got new exhaust manifolds and gaskets last year
Just filled tank with of 91 octane in been running 87
Could be fuel related mmm.
I'll check codes tomorrow. Just scares me when you do Google
search could be a lot of things.
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Old 02-01-2015, 09:13 PM   #5
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The 04 fuel pressure is regulated to 58 psi. There is a Schrader valve on the passenger side forward fuel rail where you can check the pressure. When you turn the ign key on the pump runs for a few seconds and then shuts down waiting on a crank signal to provide a run sense to the PCM.
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2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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