Ive changed the coil and fuel pump but can't find why it won't start
Check all fuses and relay fuses. Then "crack" the fuel line to the injectors and crank to see if fuel is present. If fuel pressure is present, check for spark (Ensure no spilt fuel is around) by cranking with plug lead shorted off the spark plug.
Testimonial: "Ive tried your solution already and still nothing. I think it could be the ignition bypass but not sure"
SOURCE: topkick cat 3116 wont start
Check your fusible links; these are small wires molded into the middle of a bigger wire they are usually located up by the battery cables. When they burn they become discolored and softly flexible. Also check your relays too.
SOURCE: 1987 GMC sierra , no fuel pump power.
The inline fuel pump fuse on the passenger side firewall is good? Are you jumping it with 12 volts at the test lead or the fuse?
SOURCE: shuts off while driving. no fuel pressure. pcm fuse blows/ fuel pump relay inserted.
Sounds like the fuel pump is shorted.
SOURCE: 1999 GMC Suburban Wont Turn Over
It sounds like you have a security problem, I had the same thing it would fire and run for half of a second and then that was it if anything at all. Had the security system rebooted, now it starts and runs fine.
SOURCE: I have a 1997 Gmc Sierra 5.7 4x4. It has no spark.
It could be the CPS, but as you now know throwing parts at a repair is costly and sometimes it does not fix anything. A code scanner should be able to tell you if the sensor is bad. If the CPS goes bad you will have no spark.
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it cranks but doesnt start, also the daytime lights and dash warning lights dont come on when the key is on
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