Cranks but will not start

Hi,

If you are not getting spark, the most common cause on these vehicles is the crankshaft position sensor. It is located on the transmission bell housing. I attached a picture below.

Take a look through this link and let me know if it seems to mirror what you are experiencing.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Also, there are other things that would cause it to stall. The Auto Shut Down, camshaft position sensor and so on. However, those things would also shut down fuel delivery and you mentioned it is getting fuel.

If you haven't already, please confirm there is no spark to the plugs when it won't start.

https://www.2carpros.com/articles/how-to-test-an-ignition-system


Let me know what you find.

Joe

So I am getting 12 volts to the coil but no spark to the distributor. I have read that it could be the circuit breaker. I tested the resistance in 2 different coils and both checked out fine.

Hi,

First, I attached a schematic related to the coil. Note that power is supplied via the PCM/ASD relay B+. You have power there, correct? If so, the next thing is the coil driver in the PCM. The PCM provides a ground path for the power to complete the circuit. Check to confirm there isn't a wiring issue between the coil and the PCM pin 19 coil driver. Check the wire for continuity first. Make sure the battery is disconnected when doing this. Also, after the battery is disconnected, remove the connector at the PCM and see if the pin is corroded or damaged.

Let me know what you find.

Joe

So I followed your first piece of advice and checked my crankshaft sensor and boom someone had spliced the three wires and they were broken were I couldn't see them. Rewired it and it fired right up. I let it sit and idle for 20 minutes then went on a 10 minute ride and it ran fine. Thank you for the advice. I also have a 1988 Chevrolet S10 that will run and idle but when I try to give it has it starts missing and popping. Could the cranks shaft sensor be the culprit of that as well?

Glad to hear you got it going. As far as the S-10, there are several things that can cause that issue. However, and I hate to ask, can you start a new thread for that topic. We are trying to keep the threads specific to one topic so they are more likely to help others. I hope you understand.

Regardless, this is good news. I will watch for the s-10 question to surface.

Take care,
Joe

No problem I understand completely. I will start a new thread on the Chevrolet when I get off work.

Thanks. I will watch for it.

Joe