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Pontiac of the Month

gscherer78ta's 1978 Trans Am

2019 February
of the Month

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Question

Just replaced battery and my mass airflow sensor. Codes were cleared car runs great. Next day car wont start, it tries but wont run. Any ideas?

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:welcomeFP:

Lights or anything popping up on the dash?

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My fiance did plug in the computer tester after putting new battery and MAS in. Cleared the codes it ran great tge next day it started but quit after 30,sec. Now wont start at all.

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Charge the battery back up. Make sure the computer tester is unplugged. Put a mutlimeter on the battery terminals and see if you are getting any significant current draw (make sure everything in the car is turned off, doors closed, etc.). If you have significant current draw, then you have a short somewhere or something is on that should not be.

BTW - what where the codes you had before you cleared them?

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12 hours ago, Love my Grand Prix said:

My fiance did plug in the computer tester after putting new battery and MAS in. Cleared the codes it ran great tge next day it started but quit after 30,sec. Now wont start at all.

Well I would believe in the process of replacing the MAS you have one of or several things, all of which will not allow the engine to run but a short period. You have a leak at either the MAS, the IAC or the IAT, or electrical issue at the plug of one of them or the wrong MAS.

Since the MAS was the item worked on last, I would start there.

Edited by Last Indian

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