Maybe the GenII Mopar PCMs would do that, or if you have the blown
plenum gasket, but I had several mods done on both my '99 and '00 and
did just fine running the 89 octane with the mopar PCM. The Mopar PCM
runs rich enough it shouldn't hurt. If you are worried about it, then
next time you get gas only put a half tank in. If you start getting
detonation, then top off with premium.
Brian Cropp
teseract@moparhowto.com wrote:
> With all the talk about pinging with 92 octane I thought that would be the last
> thing to do -- especially when we're on winter gas now?
>
> In article <4AD65430.7020106@cox.net>, hskr@cox.net (Brian) writes:
>
>> Also Think about running 89 octane instead of 91 or 92. You will get
>> better performance and better mileage with the 89.
>>
>> Brian Cropp
>>
>>
>>
>> Matt Beazer wrote:
>>
>>> I guess I should explain - I've been making this same trip every day
>>> to work since April and I never got below 12, usually in the
>>> 12.5-13mpg range. Most people said that the MP PCM would improve
>>> mileage, mine went down by 2-2.5mpg, that's like 15%+. I expected it
>>> to be about the same or +1mpg. But as another individual said, it's
>>> still learning. It takes me a month to burn through a tank of gas so
>>> that isn't helping either.
>>>
>>> I think I need to take it out for a longer drive at higher speeds than
>>> a max of 35mph to get the PCM "tuned in" properly. I'm also
>>> considering replacing my O2 sensor as the one in there I'm sure is the
>>> original with 137k on it.
>>>
>>> That and spending a couple hours yanking out fence posts on this tank
>>> probably didn't help either... doh. Funny how your wallet taking a
>>> hit makes you lose all sense of logic. ;)
>>>
>>> Thanks,
>>>
>>> MattB
>>> (Still having sticker shock after driving a Neon for 6 years)
>>>
>>> Ray Block wrote:
>>>
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Matt Beazer
>>>>>
>>>>> Wow, I hope I didn't fill the tank all the way up last time I filled up
>>>>> and reset the trip odometer out of habit... because 182.5 miles on 18.8
>>>>> gallons of fuel really sucks for fuel economy with this MP PCM, even if
>>>>> my speedometer does read 4mph high at 30mph (8.82% off).
>>>>>
>>>>
>>>>
>>>>> If I take into account the speedometer being off...
>>>>>
>>>>>
>>>> Perhaps you're not aware that different speedometer gears are
>>>> available to
>>>> correct for non-stock tire diameters?
>>>>
>>>>
>>>>
>>>>> ....that still means I really only went
>>>>> 198.6 miles, which is only 10.56mpg (admittedly all short trips, less
>>>>> than 3 miles per cold start).
>>>>>
>>>> Help me understand this, Matt. You drive "less than 3 miles per cold
>>>> start" and you are blaming an MP PCM for crappy mileage????????????
>>>> Do you
>>>> really need an explanation?????
>>>>
>>>> FWIW, my Dak's gas mileage improved when I installed the MP PCM.
>>>> However,
>>>> I do drive it far enough at a time to get the engine warm and off the
>>>> "cold
>>>> enrichment" from the PCM. :)
>>>>
>>>> Ray
>>>> http://www.dragtruk.com/ENTRIES/20KM1FD2KWBP.html
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>
>
>
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