i have 98 GMC Sierra

Asked by GuruB3YG1 Jan 25, 2019 at 03:54 PM about the 1998 GMC Sierra 1500 C1500 SL Extended Cab LB

Question type: Maintenance & Repair

I put a brand new battery and starter on it, still won't start when it's cold out
unless I hook jumper cables to it.

2 Answers
27,570

oilyspill answered 5 years ago

Make sure battery has a full charge and connections all good. Have you tried a block heater, to see if it helps? Can you keep vehicle in heated garage? Another thought, vehicle cranking, the systems get battery voltage. Engine running, the systems get generator voltage, that can be several volt difference. Check voltage drop for systems. If it cranks good but won't start, check spark--proper fuel pressure and fuel injector pulse. Just my opinion.

Mark helpful

F_O_R answered 5 years ago

Did you install a small battery? If it is really cold you need the most powerful battery that will fit.

Mark helpful

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