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
No virus found in this incoming message.
Checked by AVG.
Version: 8.0.100 / Virus Database: 270.4.0/1509 - Release Date: 6/19/2008
8:00 AM
This archive was generated by hypermail 2b29 : Mon Jul 21 2008 - 10:10:56 EDT