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Jeremy Mc.
Dodge Dakota
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5/19/2004
01:26:19
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 Subject: Mopar Performance PCM Loss?!
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I have a `99 R/T CC. Headers, no cat, 180 stat, .75v tps, 3" series 40.
Due to the severe gas price increase I put my stock PCM back in this past weekend to be able to start buring 87 octane again. The past two days I have been barking the tires again. Something I just realized hadn't been happening since I put the performance PCM on.
Is this showing a power loss from the advanced timing over stock on top of having no major engine upgrades?
Any other ideas? I only mention this because on Central Expressway and the George Bush Turnpike I noticed a "seat of your pants" difference of rolling WOT acceleration.
Thanks,
Jeremy
Wylie, TX
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S Dave
Dodge Dakota
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5/20/2004
10:33:25
|  RE: Mopar Performance PCM Loss?!
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The same thing happened to me. I put the Mopar pcm on my truck to see what kind of performance it would give with the mods I already have installed. The truck didn't seem to, it did perform worse. I suspect it has something to do with gas. It is like it doesn't have enough octane necessary for the MP pcm. I thought I would put the MP pcm back in later and just add some octane boost to it and see how it runs with that. I ran a couple of tanks of regular in my truck. It wasn't immediate, but it finally started spark rattling on the second tank. I went and put the stock pcm back in at that point. I suspect this gas has just enough octane for the truck to run on, but not let the MP pcm bring the timimg in like it is capable of doing. One possible explanation for this is that some stations are supposedly not buying premium gas for sale, but are using unleaded plus instead. I have been told this by different station owners in various locations. One stated that he is aware of his competition putting unleaded plus in their tanks for premium gas right after they are inspected by the state. They know that they have a certain period of time before they are inspected again. I believe this because I was buying gas in my hometown at one time and my truck was running funny. I couldn't figure it out. I went to Statesboro one night and bought some gas. I got in the truck and started down the street. I mashed into the gas pedal and I felt the truck spring back to life as the computer shot the timing back into the engine. It was quite a difference in how it performed.
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Black99R/Trc
Dodge Dakota
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5/20/2004
16:34:52
| RE: Mopar Performance PCM Loss?!
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When u keep swapping pcms, they havent learned yet, allow at least 400 miles for the computer to run best with your engine combo.
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Jeremy Mc.
Dodge Dakota
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5/20/2004
17:32:57
| RE: Mopar Performance PCM Loss?!
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I had my upgraded PCM in for 20k miles.
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S Dave
Dodge Dakota
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5/21/2004
14:25:22
| RE: Mopar Performance PCM Loss?!
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I am sure that in my case that it had nothing to do with the fact that the computer needed to adapt to engine combo or driving styles. Two tanks of gas is well over 400 miles in any case.
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01Motorsport
Dodge Dakota
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5/21/2004
22:24:01
| RE: Mopar Performance PCM Loss?!
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Jeremy, I think that you are on the right trail about the octane affecting the MP PCM. A few years ago, I had a '92 5.2 RC with the MP. Back then, some stations had 92 octane for premium, some 93. I could hear "pinging" (preignition) on the 92. So in my case, "premium" meant 93 to satisfy the computer. Otherwise, I never noticed a performance drop-off in the 60K miles with the MP installed.
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01Motorsport
Dodge Dakota
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5/21/2004
22:38:22
| RE: Mopar Performance PCM Loss?!
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You also mentioned going to 87 octane. In most areas, 93 octane is 20 cents more than 87. When gas was $1 a gallon, that was a 20 percent difference. At $2/gal., its 10 percent; going up, the difference shrinks. I know these fuel price increases stink big time, but just a little food for thought. At least now, you get more of your octane money's worth with 93.
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