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Old 05-28-2009, 09:07 PM   #3 (permalink)
mack1
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Join Date: Nov 2007
Location: Texarkana, Texas
Posts: 1,245
OS: xp sp3

My System

Re: 94 s10 chevy blazer WILL not start

Hi nativemocan and welcome to TSF,

Can you tell us what engine you have. They used both 4 and 6 cylinder engines that year. They also used used both throttle body injection and sequential injection systems.

Like octaneman, I'm assuming that you have narrowed the problem down to ignition. That said, he has given you some good advice. If I repeat below, then you will have read it twice

I like to start by placing a plug (spare or removed from a cylinder) on the block and hook the plug wire to it. I like to see a strong blue spark across the gap when the engine turns over. If this fails, I normally take some voltage and resistance measurements. Normally there is a control module mounted beside the coil that receives 12 volts when the ignition is on. The PCM sends signals(5 volt) to that module when the engine is turning over. I see is this is occuring. The module in turn, sends the 12 volts through the primary winding of the coil causing the spark at the secondary output. There are some resistance values specified for the coil windings and also for the plug wires. Using these measurements, I can usually find the failed part. If the problem is the 5 volt signal from the PCM, then other sensors might need to be looked at.

Let us know if you have a volt/ohm meter and if you need guidance on taking the measurements.

Best regards,
Mack1
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