My 2008 GMC sierra 1500 5.4 CRANKS BUT WONT START

Asked by Morleyking Mar 29, 2018 at 02:39 PM about the 2008 GMC Sierra 1500 SLE1 Crew Cab 4WD

Question type: Maintenance & Repair

BATTERY WAS DEAD PUT A BOOSTER ON IT THEN WHEN CRANKING IT
OVER IT STARTED FOR A SECOND THEN THEN IT WOULD CRANK BUT
WONT START

2 Answers
27,650

oilyspill answered 6 years ago

Make sure battery has a full charge. Have a helper crank it while you visually check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse. Because you lost battery voltage, it makes me wonder about vehicle security system? There is a 30 minute relearn procedure, I don't know if that will help? You turn the key on, the security lamp on the dash stays on about 10 minutes, then turns off, turn off key and remove. Do this procedure two more times. If your worried about running the battery down, use a battery charger on lo charge.

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midnight32 answered 6 years ago

if your battery is bad you should go for a diehard battery not endorsing them but i have had one for about 12 years and i only put it on charge for 3 hours about 3 weeks ago and it fired up 2 days ago after sitting for about 2 years

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