This 2003 Pontiac Grand Prix V6, towed in from 4 hours away, has been around the block a few times and has 325k miles on the odometer!
Owner says that for over a YEAR he has been trying to figure out a persistent 5V Reference and MAP sensor Circuit faults.
Car has a Long Crank Time, Runs Rough, Hesitates, and Idles at 2000rpm!
He has replaced EVERYTHING under the hood including the PCM, tried some wiring modifications, and finally threw in the towel.
There are FOUR different MAP sensors in the "spare parts" box, among many other things.
Let's dive into the "Parts Cannon Pontiac" and follow a logical approach to see what's going on with this 5V Reference Circuit and the MAP sensor.
Can we get it back on the road with NO PARTS REQUIRED?
Place your bets now!
TOPDON Phoenix Plus 2:
https://www.amazon.com/dp/B091BQNR3S?linkCode=ssc&tag=onamzpineholl-20&creativeASIN=B091BQNR3S&asc_item-id=amzn1.ideas.NHZL00NIDEPF&ref_=aip_sf_list_spv_ofs_mixed_d_asin
ASTRO AMP CLAMP:
https://www.amazon.com/dp/B08MTCMWLB?linkCode=ssc&tag=onamzpineholl-20&creativeASIN=B08MTCMWLB&asc_item-id=amzn1.ideas.UKPVIGM4POWZ&ref_=aip_sf_list_spv_ofs_mixed_d_asin
ASTRO DVOM:
https://www.amazon.com/dp/B07FDBW1PT?linkCode=ssc&tag=onamzpineholl-20&creativeASIN=B07FDBW1PT&asc_item-id=amzn1.ideas.UKPVIGM4POWZ&ref_=aip_sf_list_spv_ofs_mixed_d_asin
TS100 POCKET SOLDERING IRON:
https://www.amazon.com/dp/B07SQDZ9SV?linkCode=ssc&tag=onamzpineholl-20&creativeASIN=B07SQDZ9SV&asc_item-id=amzn1.ideas.H4433MU1BH5V&ref_=aip_sf_list_spv_ofs_mixed_d_asin
Enjoy!
Ivan