91 silverado, got it to crank over but wont fire....what are some things to check without replacing parts?

Thanks

 

Are you sure it's a spark problem and not a fuel problem?

 

Are you getting spark out of the coil?

 

we poured some gas down the tbi, you'd think it'd at least fire with that if spark was there, I havent checked the coil, how would you do that? a inline spark tester that lights up?

 

yes, a test light would work or you could even stick a screw driver in it and see if you are getting any spark. If you have spark coming out of your coil, then check at the plugs. Just pull a plug and put back in the spark plug wire and hold it against a ground and see if you are getting any spark at the electrode. If no spark there, then it maybe a control module in the distrib

 

used a inline spark light and there was no spark between the coil and distributor...so I assume the coil is bad?

 

not necessarily..the coil gets it signal to spark from the pick-up coil inside the distributor...


the only way to really check these is....check for an a/c volt signal from the pickup coil to the ignition coil....then spark from the coil to cap...then from cap to plug wire.

but yes,the coil could well be bad

 

Hey, just getting back to working on this for a friend. I did try a new coil since the old one failed one of the tests in the haynes manual. Anyways it didn't spark. Can I use a meter to check the a/c volt signal from the pickup coil to the ignition coil? What reading should I look for? Its a pain to get over there so I'd like to have some options and parts ready so I don't have to make multiple trips.

Thanks for any help