Having problems with your 1999 Chevrolet S-10 Pickup ?

S10 1999 pick/up

\015 Truck starts sometimes and sometimes not what do i need to check for.\015 Posted / edited by AnonymousUser on : 02-12-2019

Answers :

Do you hear the fuel pump when you turn the key on before you turn the engine over. Turning the key to the on position without engaging the starter you should hear a high pitched buzzing sound for 3-5 seconds while the pump builds up fuel pressure in the line.

If you hear that, then try to get a fuel pressure guage. Look for the fuel supply line and towards the back of the engine you will see a fitting that looks like the air nozzle on your tire only larger and that is where you hook the guage too. Then do the same as above turning the key on and I think you are supposed to have 60-62 lbs of pressure when the pump stops. If you don't, I would say you need either a fuel filter replaced or new fuel pump. If it gets to 60-62 lbs, then watch it after the pump stops to see if it holds the pressure. If it drops quickly, it could be a fuel pressure regulator or you have a leak somewhere.

If it builds and maintains pressure, then the first thing I would check is your distributor cap. I had a 98 S10 that did they same thing you are asking about and in the end it was a bad distributor cap where the spark was jumping around instead of only going to the intended cylinder. I found that by putting a timing light on the truck and it showed the cylinder getting multiple sparks during the cycle when it should have gotten one. Or if you take the distributor cap off you will see white cloudy marks up where the contacts are if you don't have access to a timing light.

You could also take the spark plugs out and see what they look like. If they are clean and pretty clean, you probably have good spark, if they are wet then spark most likely is your issue. Without knowing how many miles your truck has on it or when you replaced the plugs and spark plug wires, that might be your problem as well.

Could also be your injectors needing cleaned and/or replaced.

Check the simplest things first and work your way up until you have it found.

Hope this helps you out.
Repair Help & Product Troubleshooting for 1999 Chevrolet S-10 Pickup

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