Expert: Skip Bollinger - 4/15/2007

Question
For some reason I was driving my 1988 Chevy s10 and it popped 3 or 4 times then shut off. When I try to start it , it acts like it wants to but doesnt. I checked my fuses and they're good. I also got gas , so what can it possibly be?

Answer
Trevor,
  Please let me preface this reply that I'm a Parts Professional, NOT a tech but I will offer some thoughts.
  You don't say if it "popped" through the intake or exhaust. IF it backfired through the intake, it could be a lean condition even if you have fuel. You may not have a sufficient amount OR pressure. It could be a fuel pump going bad, a clogged fuel filter or a bad fuel pump regulator. I'd remove the fuel filter and see if you can blow through it easily. Yes, you will get gas on your lips so have a rag handy to wipe them off.
  If it backfired through the exhaust, it could be a timing (phasing) problem between the crankshaft and camshaft. Without knowing what engine you have, I'm just guessing but you can bring the crankshaft up to top dead center. Remove the distributor cap and look at the ignition rotor. It should be pointing at #1 spark plug wire OR 180 degrees out. Either one is acceptable. While you have the cap off, have someone rotate the crankshaft by hand while you watch the rotor. Once it begins to move, have them move the crankshaft in the opposite direction. The rotor should begin to move IMMEDIATELY!! If it doesn't, the problem is in the phasing between the crank and cam.
  Other options are Oxygen Sensor, Throttle Position Sensor, Idle Air Control Motor and Air Intake Charge Sensor. Those would have to be checked by a trained Professional with PROPER testing equipment. Not all "mechanics" have the proper equipment so choose one carefully.
  That is the best I can do. I hope this helps. Please remember I'm a Parts Pro, NOT a tech. I hope this finds you and your family well and happy. Good luck...
Skip