Why would my Suburban crank but not start and backfire and no codes are showing up?

Tiny
BRADNTASHA1
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 216,000 MILES
My 1999 suburban started to run rough about a month ago and I put new spark plugs, wires, rotor and cap on. About a week ago it would crank but not start and it backfired I replaced the ignition moduler and it started right up it was running rough so I changed two spark plugs that had alot of gas on them and then is started and ran great after it warmed up. Yesterday it rained and it would crank but not start then it backfired again. This problem seem to happen when it is raining or wet outside. There is also a leak in the windshield and water is getting in on the passenger side were the glove box is located so I am not sure if the computer itself has been runied?
Wednesday, December 21st, 2011 AT 7:14 PM

2 Replies

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check ignition system for bare or shorted wires, incorrect pick-up coil resistance, loose ignition coil connections or moisture in distributor cap
cap is very common failure too
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Friday, October 4th, 2019 AT 3:43 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Merry Christmas BMR -be safe and sound nice seeing you again-Yup! I'm still here
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Friday, October 4th, 2019 AT 3:43 PM

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