Join Date: Jun 2009
Location: Fort Irwin, CA
Danny R is offline
Re: 96 2.2 with no Spark in 97 S10
Check the resistance of the coil packs. I believe you can find the info on that in either a Chilton or Haynes manual. That's how I found out my packs were shot.
The wire difference is not major. Two of the wires would be voltage in and voltage out. The third is just a ground wire. The cranks should be the same as far as notches and construction. 96-97 cranks were the same and changed in 98.
I assume you've either put a spark plug into the plug wire and laid it on the block or are using a spark tester. If so, and still nothing, check for disconnected ground wires coming from the main harness. There should be about 3 on the passenger side of the motor and 2 on the driver side. All of these grounds are up towards the bottom front of the block. Make sure they are clean and tight, and that they are touching bare metal.
If still no spark, you need to isolate the pulse wire coming from the computer to the coil pack. For that you'll need wiring diagrams from a DIY manual like I mentioned above. Check for the correct voltage.
I am assuming you understand the whole process for generating spark. If not, and for others, here it is. The crank spins. When it gets to the desired compression position (typically slightly before reaching top dead center (TDC)) the CKP "sees" the notch in the crank magnetically, and shoots that signal to the computer. The computer then figures if it needs to fire now, or a few milliseconds later depending on fuel mix and all the other readings from other sensors (ignition timing advance or retard). Once ready, the computer will give a pulse signal to the coil pack for that specific cylinder, and the coil will fire the plug. This all happens in a few milliseconds! So, if even one thing is off, not plugged in all the way, or messed up, you will get a no spark situation. All you can really do is slowly trace the steps (in reverse order from the plug back to the computer) until you find the problem. Just buying and replacing crap doesn't work unless you've got tons of money.
Other possibilities include a shorted out wire in the harness (or a chewed up one, I've seen mice EAT hundreds of feet of wire in an engine bay!), faulty computer, weak coil packs, old plugs and/or plug wires, too large of a gap in the spark plug, bad grounds, dirty spark plug hole threads (which prevent the spark plug from making a complete circuit, thereby giving you no spark), faulty crank position sensor/cam position sensor, the list goes on. As you can see, this is no fun task to diagnose. But if you've got patience, a good multi-meter, and a manual, its possible. Good luck! You're gonna need it.
Last edited by Danny R; 06-23-2009 at 01:15 PM.