A friend of mine has an issue with his 1999 Dodge Ram 2500 5 spd 5.9L GAS back firing.........sounds like gunshots!! no check engine light on yet but im guessing a few more backfires that cat with get blown apart then the light will come on.

any help in this would be great.......... ive never come across this in the 8+ dodge rams ive owned.....

thanks all


01 Ram
99 Durango
97 Eclipse
84 Colt GTS (3)
77 Ram 200
74 Power Wagon (crew cab)
66 Charger

 

Are all the spark plugs connected? What is the condition of the cap/rotor and plugs?

 

new plugs, cap. rotor, plug wires

 

Are all the spark plugs connected correctly? I wrote the firing order on the back of my hand and read the drivers side upside down one time and it seemed fine when I started it until I revved it a little bit and it started backfiring like crazy. Follow each wire to the cap and make sure they are connected to the right spots on the cap.

 

+1 on the plug wires i did the same thing once too and it backfired, a haynes manual will show you the proper firing order on the distributer.

 

I had them completely backwards. 1 to 7, 3 to 5, 5 to 3 and 7 to 1.

 

lol i just had the 3 to 5 mixed and it sounded like a shotgun in my driveway.

 

from looking at the haynes manual the firing order should be:
1-8-4-3-6-5-7-2

what does order of spark plug wires have to do with firing order? not really sure what the firing order means but there it is. it has a diagram of the cylinder blocks and then the dis cap. both of them are numbered. so for example the #1 piston is on the driver side front, then where does the wire go that is plugged into piston #1? (i say #1 on dis cap) but why would it fire the #8 piston next?

 

ill pass on the firing order deal. he isnt the mechanical type but the back firing scared the crap outa me one morning when he drove by. It was like a damn mortar round going off!


Thanks all

jeff
USMC

 

If you've got high voltage on the secondary of the coil when the tip of the rotor is near a terminal on the distributor cap, the energy is going to the spark plug on the far end of that wire whether you like it or not. You want everything coordinated so that the spark leaps the plug gaps at just the right time -- anything else and you get symptoms ranging from poor fuel economy to failure to run, and if you get it just wrong enough you can light fires, make big booms, or even stop the crankshaft dead in its tracks.