Should BLM ever hit 160 while just cruising

[AsphaltAnihil8r]

Seems when I come to a stop light the BLM go to 160 when I leave lightly from the stop light the dip to 115-125,I have installed a new Fuel Filter and Changed the FPR with a "known good one"

Should I not worry,,have not tried a WOT blast in a while,...

What do you think,,Fp 42 line off

 

[TurboJim]

Do you have a 3" translator? If so, try setting it to the 3.5" base 0 setting and see if BLM comes down. When I first put mine in, my car shot to 150. It was always 128-134. I played with the settings a bit and found the 3.5" base 0 brought my BLM back to normal. Seems the cal was just a teeeny bit off and the 3.5 cal was closer. At idle having MAF values just a little off can wreak havoc.

Otherwise, if BLM is 160 at idle I'd suspect a vacuum leak. Have you changed the PCV valve recently? You should be using a genuine AC Delco one as most of the aftermarket ones arent calibrated properly. If not, start looking for a vacuum leak or a dead/snoozin O2 sensor

 

[AsphaltAnihil8r]

Originally posted by TurboJim
Do you have a 3" translator? If so, try setting it to the 3.5" base 0 setting and see if BLM comes down. When I first put mine in, my car shot to 150. It was always 128-134. I played with the settings a bit and found the 3.5" base 0 brought my BLM back to normal. Seems the cal was just a teeeny bit off and the 3.5 cal was closer. At idle having MAF values just a little off can wreak havoc.

Otherwise, if BLM is 160 at idle I'd suspect a vacuum leak. Have you changed the PCV valve recently? You should be using a genuine AC Delco one as most of the aftermarket ones arent calibrated properly. If not, start looking for a vacuum leak or a dead/snoozin O2 sensor

Jim ,I have the stock MAF..

Will start looking tonight

 

[TurboDave]

While you're looking for a vacuum leak, also look for header leaks/cracks. They will also give you the abnormally high BLM at idle, much like a vacuum leak will do.