97 s-10 no spark

[rootdawg]

I have a 97 s-10 4x4 manual shift I changed out the timeing chain sprockets etc. it ran before I did the job but when I put it back together I an getting no spark turns over fine its got new plugs dist. cap and rotor. and also the kicker is that my ob2 code reader will not even come on and I know this works. I would greatly appreciate any feeb back you can even e-mail me [email protected] thanks

[old_master]

As for the OBDII not reading codes, check both sides of all fuses with a test light or volt meter. Post any codes. What engine? Totally different diagnostics from here on out.

[rootdawg]

Thanks old master its a 4.3 manual I checked all of the fuses they all check out good I even check all of the fusible links that i could find if you have anymore knowledge or question I will so appreciate it (you don't even know) thanks philip g.

[old_master]

The pink wire at ignition coil and at the ignition module should show battery voltage with the ignition in the RUN and START positions.

The white with black stripe wire at the ignition coil comes directly from the ignition module and should pulse ground while the starter is cranking. Verify these and post your results.

Does the fuel pump come on when the ignition is initially turned to the RUN position and then shut off after 2 seconds?

[rootdawg]

Both of those wires have voltage and the fuel pump comes on and off properly I check voltage in all fuses and they are all good too.

[rootdawg]

someone told me that it could be the ignition switch also do you have any feed back on that

[old_master]

If you have proper voltage on the pink wires, the ignition switch is working... at least that circuit is. Does the white with black stripe wire at the ignition coil pulse while cranking? The pulse signal is a ground pulse from the ignition module so if you use a test light, connect the alligator clip to battery positive then probe the white with black stripe wire. Post your results.

[rootdawg]

the white and black wire at the coil pulsed only one time I undid the my tester and tried it again but it still did not pulse maybe were getting close to the problem. thanks

[old_master]

Yup, getting close. When the engine is cranking, (or running), the crankshaft position sensor sends a pulse to the VCM. The VCM sends a pulse to the ignition control module. The ignition control module sends a pulse to the ignition coil and the coil fires.

The black with white stripe wire at the ignition control module must show less than 5 ohms resistance to ground. Disconnect the electrical connector for this test only, then reconnect and continue.

The white wire at the ignition control module must show a positive voltage pulse while cranking.

The pink wire at the ignition control module must show battery voltage while cranking.

The white with black stripe wire at the ignition control module must show pulsing ground while cranking.

The pink wire at the crankshaft position sensor must show battery voltage with the ignition switch in the RUN and START positions.

Post your results for each wire.

[rootdawg]

I have the proper spark at all the ares you said. The ohms are also good but I still don't have any pulse on the black and white wires at the control module

[old_master]

If you have correct voltage on all except the white black stripe wire at the ignition module, the ignition module is faulty. That wire supplies ground to the ignition coil to fire it.

[rootdawg]

I tried a new ignition module and that did not work tommorrow I will test all of the wires you spoke of before again, if you have any other ideas I will glad to hear them

[old_master]

Notice there is a white wire with a black stripe, and a black wire with a white stripe at the module. Don't get them mixed up. Post your results for each wire.

[rootdawg]

I went on ahead and checked all of the wires again the white wire at icu did not pulse and also the black and white wire still has no ground pulse

[old_master]

The white wire should pulse positive and the white with black stripe should pulse negative while cranking.