PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Bad Problem!

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Old May 12, 2010 | 02:26 AM
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Default Bad Problem!

SO! I crank my car, and its **** bricks or something very choppy idle and it almost dies after I give it a rev, ive tried resetting my PCM and it still does it, but the weird thing is this problem only happens every so often, and I have noticed a lose of power around the 2k rpm range. any suggestions?

ps. ive checked all the plugs, wires, injectors. Im outta things to check lol
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Old May 12, 2010 | 04:52 AM
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Unplug the MAF and see if it helps.
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Old May 12, 2010 | 07:06 AM
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yep.. It's a real bitch when U get a brick stuck in the header pipe..
Maybe datalog it, and see what comes up??
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Old May 13, 2010 | 12:17 AM
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What would unplugging the MAF do?
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Old May 13, 2010 | 01:09 AM
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it would force it into speed density mode and if it stops giving you problems... it could be your maf going out.
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Old May 13, 2010 | 01:15 AM
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Originally Posted by BobDoLe
it would force it into speed density mode and if it stops giving you problems... it could be your maf going out.
agreed. I've heard of this happening before and doing the same thing.
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Old May 13, 2010 | 01:15 AM
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What exactly does speed density mode do? Sorry for the questions lol ohh and I tried it and it still bogged down and acts like it wants to quit, but when I plugged it up it fixed, the maf is basically brand new.
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Old May 13, 2010 | 01:17 AM
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Speed density just reads off the programmed Ve tables. Doesn't use the maf to correct for air differences. IMO it wakes a car up a lot if you do just a speed density tune. I'm doing that this summer.
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