| From | Message |
Rob Nordick
Dodge Dakota
JOIN HERE
4/02/2003
13:31:51
|
 Subject: 3.9 magnum backfiring
IP: Logged
Message:
I have a 94 3.9 magnum, 5 spd, and it backfires when I downshift. I don't know why and the only things that I can think of are that I cut out the catalitic converter or bad cap and rotor, or maybe timing chain though it was changed 80 000 km ago. If someone could lemme know why this does what it does it would be much appreciated.
|
Ryan
Dodge Dakota
JOIN HERE
4/02/2003
17:23:14
|  RE: 3.9 magnum backfiring
IP: Logged
Message:
I have the same problem. I was thinking it may be low back pressure cause my cats bad but I dont know either.
|
Amy
Dodge Dakota
JOIN HERE
4/03/2003
10:39:05
| RE: 3.9 magnum backfiring
IP: Logged
Message:
My advice is take it to a reputable mechanic that knows something about Dodges, that you trust.
Mine was doing the same thing, I took it to this creep and got the shaft instead. Now I have to replace the engine at a cost of around $2000. Have it checked out, it could be something major and then again it could be something simple. Mine just happened to be major.
|
Mark green92
Dodge Dakota
JOIN HERE
4/03/2003
17:35:03
| RE: 3.9 magnum backfiring
IP: Logged
Message:
Quick fyi: I think they all do it, The V-6 is an odd fire engine and I think the PCM leans the fuel curve on deceleration and without a cat to help deaden the sound, everyone thinks you lost a cylinder or something. I don't think there is an easy or cheap fix, hi flo cat?
|
2Mtech
Dodge Dakota
JOIN HERE
4/07/2003
15:31:44
| RE: 3.9 magnum backfiring
IP: Logged
Message:
My '95 3.9 started backfiring occasionally on compression after I installed a new cat (OEM) and 40 Series FlowMaster muffler. Hasn't seemed to be a big deal the last year, and it's kinda fun in town!
|
slopehead
Dodge Dakota
JOIN HERE
4/08/2003
18:19:18
| RE: 3.9 magnum backfiring
IP: Logged
Message:
the V6 is not an oddfire engine, the crank has offset journals that allow it to even fire. Doubt me? take a look at the distributor cap. the contacts are even spaced, inside and out.The rough idle is due to an imbalance in the engine that mopar can't fix with counter-rotating balace shafts like they use on some other engines due to not enough room in the block.
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
