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Maf/scanmaster readings

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Old and Bold
Joined
May 10, 2009
Messages
479
My car started developing a problem over the last month-6 weeks and after speaking to my mechanic we decided to change the maf. I'm in Grand Isle La and he is located in South Florida, work has me here otherwise I would have the car in his shop. Pre new maf the car was way over fueling, heavy smell of gas at idle, clouds of black smoke when on boost and generally speaking the car ran like crap. Scanmaster readings were all over the place. After changing out the maf it was a dramatic difference. I also very recently changed the fuel pump,spark plugs and O2 sensor. I used the correct GM O2 sensor which I realize could be bad out of the package. My problem is I still am getting weid readings. They are as follows taken warmed up at idle:
AF 04
LB 30
Batt 13.4
Int 128
BL 138
CLT 182
Ats 121
RPM 800-825
Tps. .42
IAC 21
CC locked up at 251
Mal 00
771-785 0.0

My int will still at times jump all around from 112-160:confused: My BL also jumps around from 128-142 and my cross counts will at times read correctly and at times lock up at varying readings. I'm getting no codes. My O2 millivolts read all over the place but generally so low that if they were correct I would have blown the engine. The few times I hit the boost I get a low knock reading from .6-3.1 I realize ZERO knock is the target.:biggrin:

Fuel pressure is set at 43lbs and goes 1:1 on boost. Thank kindly in advance for your help and suggestions as to what I should try.
 
Most of the #'s look pretty good. The BLM at idle is high because the MAF reading is low. Normal MAF readings should be in the neighborhood of 5-6 gps.

As far as the INT and BLM's moving around they are supposed to. INT is short term fuel correction and BLM is long term fuel correction. If your INT #'s are constantly above 128 the BLM will go up until they stabilize around 128. Both INT and BLM will adjust as you are driving around under different states and transition between load cells.

O2 #'s will crosscount between rich and lean during normal driving and will only stay rich once entering P/E or possibly if you have a chip which has an open loop idle which I believe the Turbo Tweak chip does.

I hope this helps.

Neal
 
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