PDA

View Full Version : Misfire Problem

jtcontla
11-09-2009, 10:39 AM
Bought A 1998 Dodge Ram 2500 V8 Magnum Lariat SLT. The 5th Cylinder Misfires Around 250 Times Per Minute. I Think Compression Is At About 140. The Wires And Plugs Have All Been Switched Around To No Avail. I've Been Told It May Be A Valve Seat Or Seal. Does Anyone Have A Thought On This???
mopar-or-no-car
11-09-2009, 12:41 PM
is this a 318 or 360
jtcontla
11-09-2009, 08:22 PM
How can you tell which engine you have?
mopar-or-no-car
11-10-2009, 05:27 AM
check the core support(the cross piece that the rad sits under) look for the litres i dont think the cubes are listed
jtcontla
11-10-2009, 09:51 AM
couldn't find it there but it's a 5.9 lit which is a 360, and thanks for replying.
Tbird100636
11-10-2009, 08:58 PM
Bought A 1998 Dodge Ram 2500 V8 Magnum Lariat SLT. The 5th Cylinder Misfires Around 250 Times Per Minute. I Think Compression Is At About 140. The Wires And Plugs Have All Been Switched Around To No Avail. I've Been Told It May Be A Valve Seat Or Seal. Does Anyone Have A Thought On This???
Have you swapped fuel injectors yet??? Have you made sure the distributor cap isn't carbon tracked or have white corrosion on the terminals inside??? You'll still have good compression with a leaking valve. You need to do a cylinder leakdown test. Any more than 15% leakage is too much. You listen by the tailpipe, the throttle body, and the oil filler to determine where the leakage is coming from. Oil filler- leaking rings. Tailpipe- leaking exhaust valve. Throttle body- leaking intake valve.
mopar-or-no-car
11-12-2009, 06:23 AM
put fresh plugs in the eng ( at least the missfiring cylinder) and run it. remove the plug shortly after and inspect it- is it wet, hot, or carboned up. then you can decide to go after valve train, fuel system, ignition etc.