99 Grand Cherokee Jeep wont start

[goon13642]

My 99 Jeep Grand Cherokee now wont start. Anyone have any ideas? The engine is a 6 cylinder 4 liter. Help!!! It just turns but doesnt fire

[fredjacksonsan]

How many miles? If 80K +, consider a CPS (Crankshaft Position Sensor) which can cause numerous issues. Check out the Cherokee section for a lot of info and some how-tos.

Did it quit running suddenly, or get worse as time went on?

[Seosamh25]

the neutral safety switch would also give you the same symptoms. They re easy to replace, but expensive, so I'd verify that as the cause.

[fredjacksonsan]

Great point Seosamh, and Welcome to AF.

There's actually a good couple of threads on the Cherokee forum about cleaning your NSS (neutral safety switch) which makes the repair a 0 dollar one. Apparently the NSS doesn't go bad, but just clogs up with stuff.

I'll see if I can find the thread.

[fredjacksonsan]

You may want to start with this thread: No Start Troubleshoot

NSS specific link

Those should help out.