1995 GMC Jimmy Wont Start

Problem with my 95 GMC Jimmy. 4.3 Vortec V6. Replaced Cap & Rotor plugs & wires and the Ignition coil and fuel filter. Question My wife's truck will not fire up the motor turns and it has spark but it won't crank up. What is so strange is the truck has been running great but when my wife came home after work she parked it for the night and when she went to go to work it would not fire up just out of the blue no prior symptoms at all.

The next day I checked out the ignition coil,fuel filter,plugs,wires,cap and rotor and they were worn and it was time to replace them so I did after the work it fired right up I drove it around a while about 3hrs and gassed it up for my lady and parked it for the evening and my wife went to go to work and it won't crank up again any help would be appreciated I am in fear that it may be a injector problem. Thank You!

Answer:
A common cause for a no start on this truck is that the fuel pump has failed. Turn the key to the ON position and have someone listen under the truck for the HUM of the fuel pump. It should hum for 2-3 seconds as the fuel pump primes the system. If you do not hear it, then banging on the bottom center of the tank can some times free up a sticking pump- but not always. A fuel pressure test is the best way to check. The pressure must be at least 55 PSI.

Even a few LBS. Less and it will not start. Since you have spark, fuel pressure is the next thing to check in any diagnostics. A leaking fuel pressure regulator can also cause a truck to be hard to start. It would eventually start, but be loaded up until a few revs clear it out.

Have a 1969 Chevy nova with a 350 manual transmission. The guy before me did a overhaul on the motor, he also put in a tilt steering column in it. I noticed when you have the key turned to the run position and left that way for about 4 minutes when the car is not running the ignition coil gets hot to the point that you don’t want to keep your hand on it. I don’t know were to start looking for this problem.

Answer:
Could just be a bad ignition coil or a faulty ground for it. If the ground is corroded it would cause extra resistance, thus making heat. Check the ground first making sure the resistance is low using a volt meter. You should get no more than .5 ohms of resistance. Then if that is OK, i would think a bad ignition coil. Also check the coil wire going from the distributor cap to the coil. See if it is corroded and replace if needed. If the engine is running good then I would not worry about checking the spark plugs or plug wires, concetrate on the things listed above.

Question:
I have a 2000 S-10, 4cyl. 2.2 liter engine. On days when it's cold and wet, damp, or just moist, the truck will not start on it's own or sometimes not at all. On days when it is sunny and warm it starts with no problem. At diagnostic check determined that the 3rd wasn't firing properly so I replace the coil pack for that cylinder. Today it is cold and raining and it won't start. What is the problem?

Answer:
Most of the time a no start or hard starting problem when it is wet outside is caused by a bad distributor cap and rotor, which your truck does not have. The other common cause is bad ignition coils. They may have corrosion on the towers, or be shorting out internally. Next is bad spark plug wires. They are susceptible to moisture as well.

Check for spark at the spark plugs when it is not starting. Then look closely at the plug wires. Another way is that when it is running fine, spray them down with a water bottle and see if the engine stumbles or actually see the spark jumping out of the wires.