Have anybody use ACD 213-4657? Is it a good replacement part? I have a stock engine, with 3.90posi When does my engines supossed to chage from close to open loop?

 

When does the engine suppose to change from open loop to close loop? sorry i am kinda newbie.

 

From startup, three conditions need to be met for transition to closed loop:

1 - O2 sensors heat up to operating temperature (~600°F), and become active.

2 - Coolant reaches required minimum temperature, usually about 140°F, but can be higher or lower.

3 - Timer in PCM times out, usually 206 seconds.

 

Thank you!!!! What about the maf? Is it a good option for a stock engine?

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Shoebox has the part numbers on his website. That does not appear to match any of them.

1993-1997 F-Body Part Number Collection

 

At the AC-Delco website, 213-4657 appears to be the current stock MAF number. It was joined some years ago with the LS1 MAF.

With numbers changing all the time, it is not really possible for me to keep my list super current, but I try to update it as changes are brought up..

 

Sure looks a lot different.