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boguspete
Dodge Dakota
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2/27/2004
14:36:12

Subject: intermittent stalling...
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I know this has been kicked around but here's my observation....

I did a reset when I put my cai, plugs, iat relocate. Had 87 octane in the tank.....ran great, power was up and no stalling....a little ping I could live with.....I changed over to 93 octane yesterday, and no more ping, BUT my intermittent stalling has come back - stop @ a light, clutch in and she'll drop the idle way off till she stalls.

I'll be switching back to either 89 or 87 oct.
ALSO - it seemed to run through the rpm's faster with the 89 octane. 87 was fine, but it hammered while accel. 93 it doesn't ping, but it seems to have a "slipping clutch" like accel.

Could this be due to preignition? I thought pre gave you spark knock, not slower acceleration. BUT If it's preign, I'm not getting the proper "bang for my buck", right?

Does this sound like I'm nuts, or is it possible that I'm right on?





J and J Auto
GenII
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2/27/2004
17:45:58

RE: intermittent stalling...
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detination will not make your clutch slip

sounds like your fuel pump is going bad

check presure 45 to 50 pounds and should hold it
for a few hours

water in the gas try a bottle of heet isopropal
alcohal in the gas tank you may have got some
water with your last gas purchase it has happened
to a lot of people

Larry
J&J Auto

boguspete
Dodge Dakota
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2/27/2004
20:06:03

RE: intermittent stalling...
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Message:
It's not that my clutch is slipping, Larry, it just feels that way, like the engine's running full tilt but not going anywhere. Ok, let's put it this way -
when I use 87/89 octane, the engine pulls fine till it hits the "power band" @ approx 2500 rpm's and up.
When I use 93 octane, it seems to not hit that power band.

Why would different octanes make the engine run completely different? I would think that the higher octane would produce more combustion at TDC than the lower octane would.

Isn't octane related to the combustion produced?
ie higher octane/more heat, lower octane, less heat?

And, if the higher octane was detonating before TDC (top dead center) wouldn't I get a knock noise?
Just seems to run like sh*t with the 93 octane, and runs great with the 87/89 in it.




J and J Auto
GenII
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2/27/2004
23:19:58

RE: intermittent stalling...
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Message:
No

lower octain fuel takes less heat to ignite and
will burn faster

higher octain takes more heat to ignite and burns
slower

If you dont have the timing and compresion running
high octain fuel will give you less performace
and gas mileage

I am running a stock 92 motor right now with the
folowing mods

cold air ram
48mm F&B
stock rockers (will be putting the 1.7's back soon)
MSD 6a and MSD Blaster 2 E core coil & MSD wires
stock computer with jet 2 chip
Autolite AP3923's gaped .060 AP5224 were to hot
4 degree advance on fabed crank sensor mount
JBA headers carsound high flow dynomax and single 2.5 tail

with reg gas 30 to 40 degree weather 18mpg
with mid range same temps 20.1mpg
with premium gas only 17

I just do not have the compresion to take
advantage of the high octain fuel

Now my stroked and ported motor with 10 to 1
compresion and mopar performance pcm I cant even
run reg or mid without sever detination but with
premium fuel no ping and it pulls 22 to 24mpg
on the high way

Larry
J&J Auto

boguspete
Dodge Dakota
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2/28/2004
07:17:11

RE: intermittent stalling...
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Message:
that's kinda what I figured. As soon as the 1/2 tank runs down, I'm going to go back to the 89 and get her purring again. At least I know the reason it stalls. Plus, the fuel prices are getting outrageous! Wish I could brew my own gas, like I do my own beer!

Thanks a bunch Larry!
Chris



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