Crank no start

2004 BUICK CENTURY

180,000 MILES • 3.1L • V6 • 2WD • AUTOMATIC

409SANTANA

MEMBER
14 POSTS
FOLLOW

Only wants to start when reset computer (disconnecting the battery for 5 minutes and reconnect) on some times when is cold first thing in the morning. ETC had a po336 code crank sensors been replace (it's has 2).

Aug 2, 2019 at 11:11 AM

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STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 POSTS

I have seen the ignition module or the ECM both do this. lets start with the ignition module first. here is the location and how to change it out in the diagrams below. Please let us know what you find. We are interested to see what it is.

Images (Click to enlarge)

Aug 3, 2019 at 12:14 PM

409SANTANA

MEMBER
14 POSTS

Hey Ken, thank you for the idea. i replace the ignition module and the ECM (from a running car) with no luck. do you have any other suggestions? thanks again for the help.

Aug 13, 2019 at 11:36 AM

STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 POSTS

Lets do the PCM next. here is the location and how to replace it. You can get a rebuilt unit online just give your VIN number and they can program it for you. Here are the replacement instructions in the diagrams below. Please let us know what happens.

Images (Click to enlarge)

Aug 14, 2019 at 10:38 AM