What is litre size of engine? Will the vehicle crank? If gasoline, have a helper crank it while you visually check for spark at the spark plugs, if you havent already. If you have spark everywhere, use a gage and check fuel pressure. If TBI fuel system, can you see injector spray pattern? engine cranking.

Have you tried checking for applicable trouble codes? You should be able to check mil codes, yourself.

Answered by JDL (expert)
14,402 answers provided

The litre size is 5.7L. It'll crank and try to fire but that's all. We already tried the spark plug check it gets perfect fire. It is tbi and it does spray like its supposed to even tho i still replaced the injectors for the h*&$ of it.

Response from dallasprouddaddy2012
3 questions asked

Did you check spark at more than one spark plug? Use a gage and check fuel pressure. Do you have good cylinder compression?

Can you check for codes. Use a jumper wire between the A & B terminals at the datalink connector. 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)
14,402 answers provided