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Elite Member
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Join Date: Nov 2010
Location: Earth
Posts: 6,453
Real Name: Isaac
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Elite Member
Join Date: Nov 2010
Location: Earth
Posts: 6,453
Real Name: Isaac
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i have chased an issue similar to this for a while myself. for me it would sometimes start, sometimes not, it would crank hard so i knew i had good electrical power to the starter and it wasnt the battery(something you might want too look into by the weak/labored cranking you describe). i thought it was a fuel issue, i could not hear the fuel pump -so i replaced it. didnt fix the issue, and still cant hear the pump. so then i went to the pump relay, nope not that either... for me it ended up being the EFI relay -same relay part number though. one way to trouble shoot this as the scenario is to pop the hood, pull the cover on the fuse box under the hood and swap the EFI relay with the tail light relay -also the same relay part number. then try to start it. if it starts right up then you have a relay and its not allowing the EFI/injectors to pump fuel into the cylinders.
i dont think its your spark plugs or coil packs. those typically give long warnings before they go bad, like misfires, rough idle, rough running, cutting out ect. they are not a boom done type of deal.
the other thing id look into is your battery cables, and grounds. is your battery tied down with the factory bracket, or do you have a bungie-cord holding it place? if the battery is not positively secured and can move around it can yank wire/cables and cause labored starts ect. get a volt meter out and check the batteries level. pull the leads off the terminals and hit the battery terminals and wire leads with a wire brush/terminal cleaner and put things back together and try it. also check the main ground going to the side of the block next to the oil filter. a simple break in the electrical circuit will stop a vehicle dead in its tracks, and a poor or bad connection will quickly drain and kill a battery. also you might want to check the alternator -no alternator likes mud or contaminates.
good luck
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