Already ran the BG Injector and Top Cylinder cleaner through the engine.
Even cleaned the injector rail - hoping for something in there. No intake
leaks, no vacuum leaks.
This one is even stumping our Chrysler Field Tech.
- Bernd
-----Original Message-----
From: Brian [mailto:hskr@cox.net]
Sent: Thursday, June 19, 2008 9:19 PM
To: dakota-truck@dakota-truck.net
Subject: DML: RE: Here's one for the other Experts on the list...
Any exhaust leaks?? Or as Ray mentioned, is it running lean for any reason
causing some spark knock that is being picked up as a misfire?? Maybe try a
seafoam treatment through the intake manifold to clean the cylinders. Might
be some carbon buildup inside.
brian cropp
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Bernd D.
Ratsch
Sent: Thursday, June 19, 2008 8:01 PM
To: dakota-truck@dakota-truck.net
Subject: DML: Here's one for the other Experts on the list...
2007 Dodge Ram 1500 - 4.7L FFV/545RFE - 19K miles
P0300 - Multiple Cylinder Misfire - Active Code when driving (Goes to stored
on next key cycle)
The code trips while driving from 1900-2500rpm under light load - Highway
Cruising
(1) Fuel Sample taken - good (no water and/or debris - ran through filter to
check)
(2) Spark Plugs all in excellent shape - Gaps still at .040 - .042"
(3) Coil's all firing properly with 8K to 20K volts (idle to 2500rpm 10%
load)
(4) Fuel Pressure: 59psi (Normal)
(5) Compression at 150-155psi in all cylinders
(6) Running Compression check: all within 2% of each other
(7) Vacuum at 18" at idle - Normal
(8) Software at current revision (checked against online database -
PCM/TCM/TIPM)
(9) Balancer straight - Checked with timing light and plate
(10) Serpentine Belt has no high/low spots (Yes, that can cause misfires)
(11) Battery Charging Rate - 14.3v
(12) Alternator at 70-80% Duty Cycle - Normal
(13) Fuel Volume - Fills 1qt in about 30 seconds
(14) LTFT Fuel Adaptives at +/-4 across all cells
(15) STFT Fuel Adaptives at +/-2 (Combined +/-6 - Within normal range)
(16) Misfire Monitor only detects the misfires at light load
(17) Cam and Crank sensors have a clean pattern on the scope - no spikes or
drops
So, any ideas?
- Bernd
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