2008 Buick Lucerne quiting

RODNEY AUSTIN

MEMBER
2008 BUICK LUCERNE
3.8L
6 CYL
FWD
AUTOMATIC
123,000 MILES

Car keeps quiting while driving or just idling. Changed crank sensor, checked fuse blocks there ok. When quits wont turn over starter jus clicks if battery dead. Cleaned all battery terminals and cleaned all ground. After it quits wait abit sometimes starts right up or just turns over no start.

3 Replies

JDL

MECHANIC
16,098 POSTS

I'd have to be sure the battery has a full charge? With intermittent issues, have to test when problem is ongoing. If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs, if spark everywhere, use a gage and check proper fuel pressure. Check for fuel injector pulse.

What about your security system?

Can you check applicable trouble codes? Some of the national brand auto stores will check codes for free. If you want to check codes, yourself, at the least, you need an obd2 code reader.

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Sunday, April 26th, 2020 AT 11:06 AM

RODNEY AUSTIN

MEMBER
2 POSTS

I have code reader. No codes. No spark and no fuel pump either. Once engine lights on it will crank but no fuel pump or start. Starting to think a relay somewhere shutting down. Or fuse block under hood has a problem

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Sunday, April 26th, 2020 AT 11:07 AM

JDL

MECHANIC
16,098 POSTS

You may have more than one problem? You could have problem with ignition switch, you were talking about the dash lights, not coming on when you turned the key?

With engine cranking, check primary voltage at ignition module and fuel injectors, pink wire.

If your ignition switch has a problem, testing anything else, first, can be problematic.

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Sunday, April 26th, 2020 AT 11:07 AM