I absolutely do _not_ believe that this is normal for Magnum engines. I
have a '99 Ram with the 318 and a 5-speed, and I've driven countless other
trucks with the same combo (both Rams and Daks) when I was in the market for
one, and I've never had the truck backfire, even once.
It sounds like possibly a timing issue? There are a few differences, I
think, between my '99 and your '93 engine, so I may not be much help, but
good luck!
""BlackDak93"" <sbarnett56@adelphia.net> wrote in message
news:cuo3lk$avq$1@bent.twistedbits.net...
>
> I brought this topic up a few months ago, and I am still trying to find a
> solution to it. The problem is my '93 Dakota 5.2L with 5-speed manual,
> backfires through the exhaust on deceleration. I have been through
> hundreds
> of hours and many more dollars trying to resolve it. I have been through
> everything I can and been to several shops, including my friendly Dodge
> dealer to have it checked out. The Dodge technician, charged me $180.00 to
> tell me that there is abosutely nothing wrong with the engine. He believed
> the problem to be my exhaust. To make a long story short, it is not my
> exhaust, although it does make it more noticeable. Stock exhaust did the
> same thing. The second leading theory is that this is normal for Dodge
> Magnum engines, and the problem is worse with a manual transmission (it
> pops
> back when I let off the gas to shift). I am not willing to concede that
> this
> is normal, although I have come to the decision that the problem is the
> manner in which the PCM controls the fuel. My primary basis for this
> theroy
> is that when I install a different PCM ( I have three) the
> backfiring/popping/burbling disappears for about three days until, I
> assume,
> the PCM gets itself reprogrammed. Then the popping comes back. Every
> technician I have been to is unwilling to accept any other theory except
> the
> exhaust system and will not objectively pursue any other ideas. I am not
> going to put the exhaust back to stock just to prove them wrong. I have
> been
> studying my manuals, and have decided to try a 94 or 95 PCM, to see if
> they
> would work any better. I believe that a later model (pre-'96) PCM will
> still
> work. All the connections are the same with the exception of pin 5 which
> is
> a signal ground that goes to the DataLink connector. On the later model,
> this line is still grounded, but not connected to the PCM.
>
> I have a few questions: First, I would like to hear what you guys all
> think.
> Any new ideas about this? Has anyone tried running a 94 or 95 PCM on a 93?
> Also does anyone have a 94 or 95 PCM for a 5.2L-5speed with Federal
> emissions that they would part with? I would rent, buy or borrow just to
> try
> my theory. I have searched the internet and I believe that part number
> 56028262 is the correct part. There may be a 56028341 also, but I can't
> verify if that number is correct. Or does anyone have a Mopar Performance
> PCM number 5249542 they would sell? There is a remanufactured PCM out
> there
> made by a company called A-1 Cardone. Has anyone ever used one of these? I
> am desperate to get this fixed. I have had this truck for over 10 years
> and
> I love the truck. I spent a lot of money swapping in this engine but it
> makes me want to park the truck and not even drive it anymore.
>
> Any new ideas or help would be appreciated. BTW, I have gone through the
> entire intake/exhaust systems checking for leaks. Replaced the leaking
> belly
> pan gasket. All the sensors have been replaced and checked. Compression is
> good. Timing is good according to the Dodge tech. Distributor cam sync has
> been set. Vacuum has been checked. All the normal stuff.
>
>
This archive was generated by hypermail 2b29 : Tue Mar 01 2005 - 10:04:31 EST