PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

85mm truck maf

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Old Aug 27, 2005 | 05:02 PM
  #1  
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Default 85mm truck maf

I have an 85mm truck maf that was installed with intake and cam.
As per the instructions on starting to tune in HP tuners I set the maf failure rate to 0. I get no code and when I scan I am still getting a signal from the maf. I have tried disconnecting the maf under hood but the car will only idle but not run.
Anyone else have this happen.
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Old Aug 28, 2005 | 01:27 AM
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At a MAF Fail frequency of 0, you are still going to get a signal from the maf because the VCM can read it. But not a problem because your VCM should go to SD mode automatically. Sometimes it takes a while for the check engine light to appear. On my vette I went 2 times with the car on the road and the Check engine light never came on when I was in SD mode, but I could tell just by looking at the LTFT histogram and just by feeling the throttle response that I was in SD mode.

Dixit
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Old Aug 28, 2005 | 01:49 PM
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set the maf high frequency fail limit to 1. this will cause the PCM to failover to SD mode the first time the MAF fails.
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Old Aug 28, 2005 | 02:58 PM
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Better yet, 0 out the MAF table completely. That's one sure way to get into SD mode right away...the car won't know what to make of the signal.
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