Again...your O2, fuel trim, and MAP readings aren't jiving - MAP goes up as
O2 goes down. A seriously blown pan "may" cause some of this...but I have
seen several vehicles (even an '07 300) with a broken baffle in the muffler
causing those types of readings.
- Bernd
-----Original Message-----
From: Terrible Tom [mailto:silvereightynine@aol.com]
Sent: Sunday, September 02, 2007 11:57 PM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: Re: DML: RE: RE: Finally got the scan tool data...
Bernd D. Ratsch wrote:
Ok time to catch up on posts...
> Ok...looked over the data sheet (thank you Jon for putting into CSV
format):
>
> (1) What is your fuel pressure at the rail?
fuel pressure seemed to be where it should be. 48/49 PSI with some very
minor fluctuations at idle - up and down rythmically about 1 PSI
difference. Rock steady at 48 under throttle.
>
> Reason for asking is that the O2's are showing a lean condition but the
fuel
> trim is showing rich (which goes along with a plugged up fuel rail that I
> have seen on these vehicles).
>
> (2) Take your fuel rail off, remove the injectors, and clean it out with
> some carb cleaner.
Hmm
>
> Only other thing that's bugging me is that the MAP reading is backwards -
> when accellerating, it should go DOWN...not up. This is inherent to
either
> a plugged cat or restriction in the exhaust system.
>
Well I've seen a Ram with a blocked CAT... guy came in lookinf for a
tune up (back at The Zone) he changed the cap, rotor, plugs, wires in
the parking lot... only to not get anywhere. Truck would not accelorate
above 2000-something RPM and he couldn't get any speed. Engine wouldnt
rev free.
My Ram will rev just fine and WOT its doesn't feel choaked.
Again, I ask - would the blown belly pan gasket cause all this? It
would explain the fuel reading lean and the ECM trying to make it rich?
It would also explain the poor fuel economy... but what I can't figure
out is why it would cause the engine to misfire, loose power, and act
like its having a nervous breakdown.
I wish someone could witness what this friggin thing is doing. SO far
the only one who got a glimpse was Andy at the BBQ this summer. The Ram
breifly stumbled when we were getting ready to go out for a mud run.
I seriously doubt the exhaust is restricted.
I'm not sure I buy the injector/fuel rail issue as the cause of this
insane problem. id feel better if I could sit here and tell you that
the intake manifold belly pan was NOT blown - but I'm about 99.9 percent
sure that it is. - I saw some nice oil pooled up on the back of it when
I have the TB off.
Ever seen a blown belly pan do anything like this?
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