I'll try and make this as clear as possible. What would cause the pcm to go into power enrich mode before the prescribed % of tps in Tunercat? I can watch my pcm go into pwr enrch mode through datamaster before the prescribed % of TPS for that rpm i.e. @ 3600 rpms it requires 48% tps to enable pwr enrch. According to datamaster, I am in pwr enrch mode at 3600 rpms with only 36% tps. I am trying to track down a stumble both at off idle and while driving

 

A bad MAP sensor (or incorrect manifold pressure - e.g. vacuum leak, etc) would cause this since power enrich mode is determined by MAP sensor reading.

 

I thought, by looking at tunercat, that PE mode was determined by TPS %.

 

It's also partly determined on MAP sensor reading. There's a MAP threshold that has to be exceeded before PE mode is enabled.

What's the MAP sensor reading when the PCM enters PE mode prematurely?

I'd also check to make sure the TPS isn't "glitching". Sometimes when they wear out, they'll spike their readings.

 

In line with the example above, @ 3600 rpms the map reading was 103.3 kpa. I also have switched Tb along with a different tps and a different IAC motor. I guess it could be time for a new MAP sensor. I dont think I have ever changed it in the 6 years and 4 motors I've had in the car

 

103.3 is definitely "WOT"

 

36% tps and a MAP reading of 103.3 kPa is definitely not right. vgeglia is correct, that is WOT. Are you sure you didn't read the barometric pressure of the atmosphere instead of the pressure on the inside of the intake?

 

I was looking at the map reading cell on datamaster right under the rpm reading

 

Do you have a log? I'd like to see it.

Sweetred95ta@hotmail.com

 

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