TorinoCobra070

Hey everyone. I have an 04 Cobra, posi ported, supporting bolt-ons, custom tuned. It's always had a little trouble starting after being run and parked a short time on hot days. Well this time it finally stumbled and cut out completely. Very strong gasoline smell. I let it sit 24 hours, still wouldn't start. I start looking into it and trace the gas smell back to the throttle body. I opened the throttle and gas is just built up in there and comes pouring out.

Edit: The car was running perfectly fine before I turned it off. It sat outside in the hot sun for about 45 minutes and then wouldn't start.

Since then I did manage to get it started once, and it was running very rough, so I cut it off. It hasn't started since.

I've searched but can't find any suggestions on what the problem is. Any ideas?

Thanks in advance, and sorry if this is poorly written. I'm posting from my phone.

TorinoCobra070

Bump - I take it from your silence that this is very, very bad and nobody knows what is going on.

Am I going to have to take it to a professional shop to diagnose?

jwog666

its just an unusual concern, fuel really has no way to get into the tb as the injectors are pointed at the intake valve. are u sure that its fuel? or could it be moisture, or engine oil/blowby being drawn into the intake through the pcv system. alot of people run an oil separator to prevent this.

TorinoCobra070

Unfortunately it is most definitely gas. It is enough volume for me to be positive of that, which makes it all the more concerning.

Derf00

The only way I can think of fuel working its was back through the TB is if you have an intake valve that is not fully seating itself and is getting fuel pushed back through it on the compression stroke. The odd idling before it shut down completely is also making me think this.

If your PCV system is getting that much fuel into it , your oil would be the viscocity of water and reek of gas. Not to mention you would be getting a lot of blow-by (smoke).

Run a compression test and then if you find something, a leak-down test to pinpoint the source of compression loss. My guess, intake valve(s).

TorinoCobra070

All the symptoms fit, other than I have not changed the oil - which I know I need to do ASAP after fixing this problem. I did have one other person suggest that intake valves could be the suspect.

I'll do the tests you suggested and go from there. Thanks for the feedback.

TorinoCobra070

Bump for further advice.

Hey guys, I am going to check the injectors first on the advice of a few people. If this is the problem, what other maintenance should I do since gas has possible been sitting in the cylinders?

I know I need to change the motor oil. Do I need to pour a little oil in the cylinders manually before restarting the car?

Should I change the supercharger oil as well? Do I need to remove the supercharger completely for any reason? A friend said maybe I should pull it and let it dry out since gas backed all the way through it as well.

Any other precautionary steps I should take before restarting the car?

Thanks again everyone.

jwog666

just change the oil, forget the oil in the cylinders as long as it isnt flooded, the supercharger oil is not exposed to fuel so thats good to stay. dont pull it off.

TorinoCobra070

Fantastic! You saved me quite a headache. Now I just need to cross my fingers and pray it is the injectors not the valves.

Thanks.