hey guys ive got a 99 blazer 4.3 2wd a p0102 code for maf thats making my truck run like crap and i cant figure it out fuses are good and swapped the maf with another one i had lying around and still had the p0102 immediately after i cleared it with my code reader ive also tested the wires its got a good ground and 12v dont have a meter to measure hz but i did swap it with a buddies who has a blazer maf code didnt carry over to his truck but im still getting the code. the freeze frame data for the code is

Calc Load (%) 11.4
Fuel Pres (psi) 0.0
veh Speed (mph) 0
IAT (°F) -40.0
MAF (lb/min) 0.0
O2S B4 S2 (V) 0.225
STFT B4 S2 (%) -20.3
LAMBDA B2 S4 0.796
O2S B2 S4 (V) 0.257
EGR Error (%) -100.0
Command EVAP (%) 3.1
Fuel Level (%) 22.4
Warm-Up DTC Cir 102
EVAP_VP (inH2O) 15.262
BARO (inHG) 0.0
LAMBDA B1 S3 0.065
O2S B1 S3 (mA) -24.00
LAMBDA B1 S4 0.065
O2S B1 S4 (mA) -24.00
Rel TPS (%) 40.8
ACC Pedal E(%) 0.0
ACC Pedal F(%) 3.1
Cir Time 36h13m

any help would be great since its my daily driver and its supposed to be driven for a trip next Thursday which is an eight and a half hour drive.

 

It thinks the intake air temp is -40°. That should get you going....

 

Is the MAF plugged in? You have posted a reading of zero.
Post the readings at idle and 2500rpm as well as the STFT1 & STFT2
As well as what's with the IAT reading?? Check the wiring to those two (MAF and IAT) since they are in the same loom.

 

I was pretty confused about the IAT reading.
Yes the maf was plugged in and the readings were from idle speeds. Ill try and post the data at 2500 rpm when I get off work later tonight and hopefully get a multimeter in hz to test the maf signal wire.

 

made it home and pulled the freeze frame data

Fuel Sys 1 OL
Fuel Sys 2 OL
Calc Load(%) 0.0
ECT (°F) 95.0
STFT B1(%) 0.0
LTFT B1(%) 0.0
STFT B2(%) 0.0
LTFT B2(%) 0.0
MAP (inHg) 10.6
Eng RPM 973
Veh Speed (mph) 0
MAF(lb/min) 0.0
TPS(%) 0.0


i sat there for a little bit revving at 2500 but it wouldnt pop it as freeze frame but what ive added is startup/idle. also when i clear codes the rpms drop and it nearly dies is this relevant?

 

If the SES light comes on immediately, after substituting a "known good" sensor, there is a real good chance the problem is in the MAF circuits from the PCM to the sensor. Follow the steps in the link to the flow chart below. Pay special attention to the "Diagnostic Aids" section: https://blazerforum.com/forum/diagno...plained-28157/

 

Hey guys sorry for the delay in replying. I checked the wiring all the way back turned out the connector to the maf was bad replaced it and all good, good thing I checked the wiring cause there was a different wire which had became a little bare so fixed before a new problem started. Thanks for the advice!!