I have a 96 xj and it will start 3 times in a row but if you try to starting a fourth time it will not start it won't even try it will just crank.i know it has a intake leak and o2s are unplugged but this problem just started happening and it will smell like fuel like it's flooded then I ha to wait a few hours and try again.same thing happens if it warms up if I shut it off it won't start till it gets cools.i am thinking it's a bad crank sensor or maybe plugs

 

Are you starting one right after the other your flooding it doing that.

 

Kinda I start it and let it idle for a minute then shut it down and do it again it will start 3 times then will just crank the 4th time and not even try to start but every plug has good spark same thing happens if you start it and drive for like a half an hour It won't try to start it will just crank

 

People have been telling me it's a crank sensor

 

If you have observed spark, it is not the crank position sensor.

Next time it wont start:
1. Press the pedal to the floor (completely)
2. Crank the engine 5-6 times
3. Release the pedal (completely)
4. Try starting again

I'm guessing it is an air/fuel mixture problem (probably resulting in a flood) and at the root of it is your unplugged upstream o2 sensor, and your air leak. You should correct those.

 

Ok will try thank you

 

Maybe injector problem...leaky injectors..

 

Not sure what it is gonna try o2 sensor change intake gasket and plugs and try again

 

does the starter turn the engine that 4th time or just spin out?

 

Tried this and nothing still happened

 

Starter stays engaged but the motor doesnt try to start it just turns over

 

And I plugged the o2 sensor upstream back in and it still does it

 

Also has an exhaust leak and old spark plugs Burns a little bit of oil but the head gasket was not tighten properly