88 Sierra 1500 starting problems

[corychilders]

I have a 1988 gmc sierra 1500 with the 5.7 TBI motor. We were haulin a other truck and trailer to the junk yard when it made a slight pop noise and cut off, almost like the timing chain/belt broke. But the distributor rotor button turns so the timing chain cant be broke and there is no play when you turn the harmonic balancer so it couldnt have strecthed either. Its not getting fire to the coil, so we replace the coil with a high performance msd coil. Still no fire at this point. We are guessin its the distributor pickup. Any chance that this is it or is this the problem?

 

[happy 2011]

yep it could or it could be the control module or a few other things.

Needs diag do you have a test light? If you do (if you don't go buy a good one)
So this is how you test it . Frist remove coil wire check for spark none go to next test (lol)
(If you have spaRK there and not at the plugs then you need a cap /rotor)

Turn key on and with the test light (if you don't know how to use a test light google it) check for power on both sides of the coil.(one is pos and one is neg)
If there is only power on the pos side then you need a pickup coil. If there is no power to the pos side you have a power supply problem. If you have power on both sides go to next test.

Next with two people put the test light on the pos side of the coil. Crank motor over if you have power then put test light on neg side of coil crank motor it should flash or blink while cranking. If it flashes/blinks then you need a coil. If it lights steady and does not flash you need a control module. Once in a while the pickup will be bad too but most of the time it's just the module.


good luck let me know how it ends