The starter motor cranks ok, correct? Have meter leads across the battery posts, have helper turn key to crank. How far does the voltage reading drop? Use a gage and check fuel pressure. I didn't see litre size of engine listed? Any applicable mil codes?

If you have throttle body injection, the fuel pressure spec is around 10 psi. If you have multiport fuel injection, the pressure is higher, around 30 or 40 psi, I'd have to look up the exact spec.

Answered by JDL (expert)
14,416 answers provided

Yes the starter motor cranks good my mechanic put in a new send unit a while back as well so I'm pretty sure fuel pressures ok I'll have to check that tomorrow morning cause if I go out now it'll start right away an that's why I'm confused cause long as I start once in the Morning even lid I turn it right off it'll start right up all day but anyways wat should it read wen cracking just so I kno wen I check?

Response from matttyw20
18 questions asked

I jus did it the battery went from 12.8 down to 9.69 when cranking I've got lifetime warranties on the starter and alternator think i should get both checked or what do you think

Response from matttyw20
18 questions asked

That voltage reading looks ok to me. If it cranks ok, maybe you need to look elsewhere for the problem. I'd do a fuel pressure test.

You can check mil codes, yourself. You use a jumper wire between the A & B terminals at the datalink connector. Then, turn key just till the dash lites come on, no further. The mil on the dash starts flashing, you count the flashes to get the codes. Your looking for two digit codes.

Answered by JDL (expert)
14,416 answers provided