Salient info: 2004 Dodge Durango Ltd., Hemi, Auto
While driving today at about 65 mph (2100rpm), I kicked down the
accellerator to pass a truck. Tranny seemed to kick down, engine started
to wind up, but despite pedal to the metal, the RPMs refused to go over
about 3900, and engine seemed to lose power. Removing foot from pedal,
tranny apparently upshifted and I slowly crept past the truck at about
It was a hot day, but a/c was off. No other unusual loads on vehicle,
and no mods. Air filter was changed 3k ago. When I stopped, the 3-click
trick showed no codes. I did the throttle limit reset number, but it
just recurred while driving home. It's still under warranty, but with no
codes, I just know I'm going to get a "could not duplicate' at the dealer.
Any ideas what caused this and what I can do about it?
Just a shadetree guess from someone totally unqualified, but absent any
codes I'd say take a look at the fuel delivery system. Fuel pump pressure,
possible restriction in the fuel line, clogged fuel filter....
Suddenly, without warning, Borzoi exclaimed (21-Jul-06 2:54 AM):
Well... actually, I've been forced to use higher octane fuel than my
truck's manual says (2001 Dakota), as I was in the UK and the lowest
octane available was 93 (no idea if the formula for determining octane
Anyway, three years running 93 octane on a truck rated for 87, and it
seems to have survived with no ill effects.
Somewhere in the archives is the discussion that was sparked when I
originally asked about this...
You are the truely clueless one here with no real grasp on engine
operation orfuel knock cotrol and the effect it has on engine
performance. The hotter it gets the more octane it needs and your
statement of damaging the engine with it really shows your total lack
of understanding here because low octane fuel can indeed damage a
engine and at the very least shorten vale life because the kncok
vibrations (even at a level below hearing it) cause valse to vibrate
in seat which causes leakage that can lead to eroision with time. The
blind leading the blind. What a surprize sometime? hook up a real time
OBD2 monitor and what engine time on a hot day with 87 octan and then
with 89 or 93 and the difference is plan to see (if you can figure out
how to use one that is)
Hey SnoIdiot, Didn't you give me a rash of trash a while back about a few
typos and that I should educate my kids instead of teaching them to shoot??
I'm not gonna mention a thing about that trash you just pecked out..
Probably going back out Sun. afternoon. By the way she keeps eyeing the two
Mausers, I think she is thinking of knocking me off so she can inherit....
She says ar's are for sissy's...sorry friend... <BG> Maybe if I could teach
her to bump fire she'd change her mind..
Nope, that was my youngest kid Cari. She will go with me on occasion but she
has to be really bored. Julie is my middle daughter that shoots with me a
bunch and Becky my oldest would if she didn't live three hours away.
Tank was 3/4 full of name brand 89 octane.
BTW, I tried to reproduce the problem today, and couldn't. I put my foot
in it at 60, and was at 90 and still accellerating in short order.
That's why I bought a Hemi.
Does anyone know if a code would be set based on poor fuel delivery?
I'll have to dig out the FSM to find the fuel filter. If it's an inline
cartridge, I suppose it's worth changing. If it's an
on-the-pump-in-the-tank unit, I think I'll wait for more repeatability
before undertaking that chore.
Ah, it's a hemi!
I'm convinced that the Hemi's engine management system is less than
perfect. Mine does things that I consider rather 'odd' as well, on a
"it feels like it" basis.
BTW, what's the top end on yours?
Have you switched recently (willingly or otherwise) to the new 10% ethanol
blend fuel? Have you recently run extremely low on fuel? If so there is
always a possibility some varnish or other tank crud has decided to come
forward & gum things up. Still I wouldn't concern myself just yet unless
the problem continues happening.
Only time I had a problem like that was after stopping on a really hot
day and then getting back in a few minutes later and driving. By the
time I got about 2 miles down the road, the vapor lock that occurred
from an overheated fuel line finally kept the fuel from reaching the
carburetor. I don't know if fuel injection systems can suffer the same
fate, but mine just coasted a bit until the air block passed and the
fuel started flowing again. If you had stopped for just a few minutes
just before it happened, then the underhood heat may possibly have
caused the same problem with your truck.
Suddenly, without warning, Langerhans exclaimed (20-Jul-06 5:19 AM):
Something very similar happens very occassionally with my 2001 Dakota -
first incident, in fact, was on the second day I owned the truck.
Mine, however, happens when I'm going slow, and temperature has no
bearing. In fact, all times but one I was backing up, then going
forward, when the same thing would happen - press the pedal, no power -
mine would try to stall. I would just turn it off, then back on, and
the truck would be fine. This usually happens only once or twice a year.
The last time though, it happened while we were in traffic, going
through Glasgow, Scotland. Going slow, but this time in second so a bit
faster, same thing happened. Stopped, turned off, back on, worked fine.
I've only just gotten my truck back on the road after yet another
overseas move, so I can't say yet if the Glasgow incident indicates the
problem is getting worse, or if it was just a one time thing.
I'd always figured it was a problem between the pedal and the seat :)
What's the "throttle limit reset number"?
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