Map Sensor, calculated load, TPS at wot
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Joined: Aug 2007
Posts: 190
Map Sensor, calculated load, TPS at wot
Ok at 100% tps, up hill in 3rd and 4th gear the calculated load reads 87.4%, my map is reading 3x in/hg at wot and the car isnt going into open loop.
Map problem?
what could cause this?
Map problem?
what could cause this?
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Joined: Nov 1998
Posts: 71,121
From: Hell was full so they sent me to NJ
What was the barometric pressure? Standard barometric pressure at sea level is about 30"Hg. At WOT, with an efficient air intake system, MAP approaches barometric pressure.
When you go WOT, the PCM does not change the "closed loop" flag. That's because the flag indicates that all the conditions for closed loop have been met. In GM's terminology, when you exceed certain combinations of throttle position and RPM, the PCM goes into "power enrichment" (PE) mode, not open loop. Yes, the O2 sensors are not used in a feedback loop, but they are still "ready".
So far, unless 3x means something like 35"Hg, I don't see any problem.
When you go WOT, the PCM does not change the "closed loop" flag. That's because the flag indicates that all the conditions for closed loop have been met. In GM's terminology, when you exceed certain combinations of throttle position and RPM, the PCM goes into "power enrichment" (PE) mode, not open loop. Yes, the O2 sensors are not used in a feedback loop, but they are still "ready".
So far, unless 3x means something like 35"Hg, I don't see any problem.
Thread Starter
Registered User
Joined: Aug 2007
Posts: 190
What was the barometric pressure? Standard barometric pressure at sea level is about 30"Hg. At WOT, with an efficient air intake system, MAP approaches barometric pressure.
When you go WOT, the PCM does not change the "closed loop" flag. That's because the flag indicates that all the conditions for closed loop have been met. In GM's terminology, when you exceed certain combinations of throttle position and RPM, the PCM goes into "power enrichment" (PE) mode, not open loop. Yes, the O2 sensors are not used in a feedback loop, but they are still "ready".
So far, unless 3x means something like 35"Hg, I don't see any problem.
When you go WOT, the PCM does not change the "closed loop" flag. That's because the flag indicates that all the conditions for closed loop have been met. In GM's terminology, when you exceed certain combinations of throttle position and RPM, the PCM goes into "power enrichment" (PE) mode, not open loop. Yes, the O2 sensors are not used in a feedback loop, but they are still "ready".
So far, unless 3x means something like 35"Hg, I don't see any problem.
It pulls like a rapped ape and it seems to drop off at about 3k, still pulls hard but seems to fall off just a little
What about calculated load? what should that be at at 5500 rpm WOT
and the at idle it reads
calculated load- 3.1
Maf- 1.xxx pounds per min
tps- 0%
map - 9.1"hg
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Joined: Nov 1998
Posts: 71,121
From: Hell was full so they sent me to NJ
Your idle numbers look fine, assuming that MAF flow is about 1.0 - 1.5 #/min (7.5 - 11.3 grams/sec). I don't know what algorithm they use for "calculated load". Most logs that people send me to review do not have that data shown.
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