Originally Posted by
Naf
I have upgraded my MAF from the stock tube to a 102mm, using the same sensor. I have calibrated the sensor to be perfect and the truck starts up with no a/c perfectly. If and when i start up with the A/C on the truck will start up, rev to about 1250rpm, steadily drop to 1000rpm then rapidly drop to just about 400rpm, it will then recover by over revvin to 1500rpm and settlin at the desired idle speed.
I checked the WB and it showes 8 afr at startup, then 14.6 afr after startup then 9 afr during the sudden rpm drop. and back up to 14.6 afr durin the constant idle time.
Its my work truck and loggin the data with a WB take a while, and i apologize for this.
Does anyone know why this is happenin?