I rebuilt my 200,000 mile engine a couple years ago but didn't replace the
drive gear. Just last week I replaced it because I couldn't get rid of a
slight hesitation (tried EVERYTHING else). After replacing the drive gear,
there was still some rotational play but not as much as with the old drive
gear. The wear pattern was VERY visible on the old gear. The fuel sync is
set now with a voltmeter and the hesitation has decreased. I think after
it's set with a scan tool, it may be gone completely (I hope). If you have
a high mileage engine, you may need to replace it. It was only 35 bux. If
you do, you should also change the brass bushing pressed in the block but
you would need special tools for that. Of course if all that is worn out,
your cam drive gear may be worn too...and if your cam is worn....;)
jamesC
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of BlackDak93
Sent: Sunday, June 13, 2004 8:48 PM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: DML: Re: RE: Setting Distributor Drive Timing (Fuel Sync) without
DRB
I didn't notice any side to side play. There was a slight bit of rotational
play, though not much. The backfire occurs whether hot or cold whenever I
decelerate, as in let off to shift gears or to coast down a hill etc. I
checked and replaced the plenum gasket. I also replaced the header gaskets.
I had a couple of leaks there from cheap gaskets. Sometimes it is more of a
burble or a rumble than a backfire, but occasionally it will pop pretty good
out the tailpipe. I'm pretty much out of ideas. The only thing I have not
done is checked the timing chain/sprockets for excessive play. I have the
chain and sprockets, I just haven't had time to replace them.
""Bernd D. Ratsch"" <fasstdak@hotmail.com> wrote in message
news:000301c4519f$2c6f2d30$020aa8c0@bernd...
>
> Was there any play side to side on the rotor shaft? If there was,
> you've got a worn out drive bushing (down in the block) which can
> cause the problems you're describing. There will be a little bit of
> play while turning, but not a whole lot.
>
> Yes, some PCM's were different...even today. Example: You can retard
> the timing with the DRB (Misc Options Screen) on some '97-'01 models
> (bitchin feature for blower motors) but not on all...don't know why
> either - it's random. Mine does it and I've retarded the timing up to
> 6 degrees just to play with it...set it back to "0" though.
>
> On the backfire, is it at all times or just when it's cold? Also -
> easy test to see if the plenum is leaking (which can also cause
> lean-out
> backfires): Remove the airhat and put your hand over the top of the TB.
If
> is doesn't suck your hand down tight and still runs after 10
seconds...it's
> leaking. (Was actually able to put my hand over the top of a Durango
> TB
and
> it still ran for more than a minute - very bad plenum leak.)
>
> - Bernd
>
> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of
> BlackDak93
> Sent: Sunday, June 13, 2004 3:03 PM
> To: dakota-truck-moderator@bent.twistedbits.net
> Subject: DML: Re: RE: Re: RE: RE: Setting Distributor Drive Timing
> (Fuel
> Sync) without DRB
>
>
>
> It seems every answer brings up another question. Bernd, you mention
> that
on
> some 94 and older models, you can't set the sync with a DRB. Is this
because
> of the PCM, or something different with the engine itself? I assume it
> has something to do with the PCM, since all the distributor components
> are the same. The reason I ask is because my engine is out of a '95
> Ram. My Dakota is a '93 with a '93 Ram PCM (manual transmission).
> This morning I was
able
> to pull the distributor and oil pump drive out and rotate it to
> approximately the 5 O'clock position. I then followed your procedure
> to
set
> the fuel sync. One thing I noticed is that there is a few degrees of
> rotation either way before the voltage level switches. I tried to set
> it about in the middle. It didn't help my backfire problem, but it
> seems to
run
> and idle better.
This archive was generated by hypermail 2b29 : Thu Jul 01 2004 - 00:15:16 EDT