Problem starting when cold

[myoung7]

Starting problems:
I own a 4X4 2-door (4.3L) 96 chevy blazer. Recently, I have had problems starting it after it sits for a couple of hours, especially if its cold out. I know the starter is OK because the engine turns, but it doesn't fire. Most of the time it acts like it wants to fire but still takes several attempts. It is due for new sparkplugs and a tune-up, but could this be the problem. Could it be a sensor or something?

If someone can help me, I would deeply appreciate it.

[cybermoser]

I am having the same problem, I have replaces spark plugs, fuel filter, battery. Have you found a fix for this. I think it has to do with not getting the fuel, it kinda acts like the "automatic choke" does not work, I know this is a fuel injected engine, so maybe there is a sensor that acts like a auto choke. Please let me know if you solve this.

[rich60630]

Originally Posted by cybermoser

I am having the same problem, I have replaces spark plugs, fuel filter, battery. Have you found a fix for this. I think it has to do with not getting the fuel, it kinda acts like the "automatic choke" does not work, I know this is a fuel injected engine, so maybe there is a sensor that acts like a auto choke. Please let me know if you solve this.

On the older TPI models there used too be a 9th injector that would prime the engine when it was cold out. I do not know if GM still uses this? But i have a 1998 blazer that does the same thing and i found that turning the key on and off 2 or 3 times helps especially when its real gold out. When u do this it primes the cylinders. I hope this helps yall?

[rlith]

when it's cold, hook a vacum gauge up to the shrader valve on the fuel line in the engine compartment. Your readings should be at 56-60 while cranking, and 61-65psi running. If it's not, you more than likely have a failing fuel pump. When it's warm out, electrical contacts inside the pump making the correct connections...When it's cold out they seperate to far. Just an idea

[Dannk]

Originally Posted by rich60630

On the older TPI models there used too be a 9th injector that would prime the engine when it was cold out. I do not know if GM still uses this? But i have a 1998 blazer that does the same thing and i found that turning the key on and off 2 or 3 times helps especially when its real gold out. When u do this it primes the cylinders. I hope this helps yall?

I really don't think you are "priming" the cylinders - more like building fuel pressure...Dumping raw fuel into combustion chambers before a start would cause unpredictable conditions.

[rlith]

: If you are turning your key on 2 or 3 times before it can achieve pressure, this means you either have a faulty injector unit or a faulty check valve in the tank assembly