In article <cuobfb$d9p$1@bent.twistedbits.net>, sbarnett56@adelphia.net
("BlackDak93") writes:
My friend had the same problem with his 93 after we swapped in a 5-speed.
We thought the truck had to use a 5 speed pcm. We used the pcms (factory and
Mopar Performance) from my 95 318 5-sp, and the truck did just that, backfired
heavily out the exhaust on the 1-2 shift, and then dropped off through the
upper gears. The truck seemed to have a lot less power as well. Just for the
heck of it we put the factory pcm (automatic) back in and it ran fine. I am not
sure if you tried that, but thats what worked for us. I dont think it would be
an exhaust issue. My friends truck has MP headers (Doug Thorley), stock cat and
a Borla cat-back exhaust. My 95 has some popping/burbling through the exhaust,
but I think that was normal with 95-96 5-speed trucks, but it is definitely not
backfiring. Just my .02, hope it helps.
Mike
>
>
> It does backfire, mostly between 1st and 2nd gears but the popping and
> burbling which happen anytime I decelerate are, at least in my opinion, much
> more than what could be considered normal. My exhaust is not extremely loud.
> It is actually pretty mellow compared to a lot of trucks around here. I have
> shorty headers, a high flow cat, a Magnaflow XL with 2.5" dual tailpipes.
> The 2.5" tailpipes are probably too much, but I have had 2" and 2-1/4" and
> it did the same thing. It did the same with a stock muffler, a turbo
> muffler, a Flowmaster 50 an IMCO chamber muffler and with resonated tips and
> a glass pack between the cat and the muffler. I even took the advice of the
> mechanic and dropped the factory 3" pipe bwtween the cat to the muffler down
> to a 2.5" pipe. I wish I had not done that. It made no difference and it
> messed up a pretty sweet looking exhasust system.
> "steve preston" <steves287dak@yahoo.com> wrote in message
> news:20050213193645.63951.qmail@web41828.mail.yahoo.com...
> >
> > I`m not really sure of the noise you describe.
> > Backfiring is one thing,but popping or burbling a
> > little bit when going down a hill,or when the engine
> > has no load on it seems normal to me. Mine does
> > that,and I`ve seen it on many vehicles with a "loud"
> > exhaust. (My Dak has a conventional exhaust into a
> > race muffler,then split out to the rear.) It seems
> > like once the engine has gotten the vehicle up to
> > speed and you decelerate,there`s no load on it anymore
> > and it will sound different because your transmission
> > and driveline are pulling up the RPM`s that would
> > normally have a tendency to drop. But please keep in
> > mind that I have no official training as a mechanic.
> > However,I did stay at a Holiday Inn Express last
> > night. :) Steve P.
> >
> > P.S. I start my new job tomorrow,in heating and
> > cooling. After twenty years of electronics repair,I am
> > conceding to the Chinese,and Walmart. So if your $169
> > 27" TV breaks,do what everybody else is doing,and go
> > buy a new one that will last 1/10 as long! :)
> >
> >
> >
> > --- BlackDak93 <sbarnett56@adelphia.net> wrote:
> >
> >>
> >> 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.
> >>
> >>
> >>
> >
> >
> > =====
> > Steve P.
> > Two-thousand one (2001) Flame Red Dodge Dakota Sport RC 4X4,4.7L
> > eight-piston w/3.92 limited-slip,air,cruise,tilt,knob(not shifter)induced
> > four by,with optional hand crank windows and finger locks that added
> > substantially to the overall cost. Steigerperformance air intake providing
> > twenty additional RWHP (ten at the flywheel). PLUS,a custom dual-exhaust
> > than is real loud,with gigantic 2 1/4" pipes sticking out the
> > back,reminiscent of warship cannons primed and ready for the heat of
> > battle. The other mods (headlight and taillight covers and black step
> > bars) do not add significantly to the speed of this vehicle,but are there
> > purely for intimidation purposes,as the markings of a cobra signify it`s
> > deadly potency. Put simply,this truck cannot be stopped.
> >
> >
> >
> > __________________________________
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>
This archive was generated by hypermail 2b29 : Tue Mar 01 2005 - 10:04:31 EST