Starting Problem when warm - Fuel Starvation?
 

I'm having an issue starting the car when warm. When its cold, it starts with no problems, but once its warm and has sat for 20-30 minutes, it has difficulty starting or won't start at all. When it has difficulty starting, it cranks fine and starts but quickly the RPM's drop and starts to sputter. Sometimes I can step on the gas in time and the RPM's will pick up and all is fine. If it stalls or doesn't start, it won't start again until I remove the gas cap.

I assume either the system isn't venting or the pump is going bad. What do you guys think.

what year and engine are we talking about here?

Just a thought, maybe your lower o-rings on your injectors are bad and are spraying excess fuel into your manifold and flooding the motor.

It's a 90 S13 SOHC

To add a little more background.

About 2 weeks ago, my upper radiator hose cracked. I don't know how long that went on for, as the car never overheated. I finally discovered it when I heard a hissing noise coming from the engine when the motor was warm. When I went to diagnose the problem (not knowing it was the hose yet), the car was idling fine, but when I stepped on the gas, the RPM's would drop and it would hesitate.

I fixed the hose, but the hesitation problem was still there. I used Sea Foam in the gas, but that didn't help. At this point, I was now having problems starting the car when warm. I changed the cap/rotor, but that didn't help. I removed the plugs and cleaned them, but that didn't help.

The car runs great when is up to speed, but there's the slight hesitation when engaging into first and the problem when starting when the car is warm.

I do need to replace the valve seals, as I'm getting the white smoke on start.

when you replaced the hose did you add coolant and bleed the air out? it sounds to me like there may be some air trapped causing you're coolant temp sensor to send wrong info to the ecu which would cause this problem.

I think its too warm. Move to alaska. Probably help your problem..















hahahahah just messing.
Not sure..sorry.

Turbo charge it. That will fix all your problems.

you two must be lost this is for technical discussions. the off topic is in the opposite direction. no run off and play while the adults use talk about grown up things.

I already put in my 2 cents.

No, not at that moment. I actually forgot to bleed the thing. I drove it around the block and everything was ok, then drove it about 3 miles and when I got to my destination, I noticed that the temperature gauge was reading higher than normal. I opened the hood and opened the overflow and some air pressure released. When i went to drive it again, the temperature was back to normal and has not increased since. I've had to top it off once.

Is there an air bleed screw or is it one of those things I run the engine with the radiator cap off.

there is a bleeder bolt next to the temp sensors on the intake manifold. it has a 10mm hex head, bleed it and hope for the best.

I thought it could be flooding too, but I pulled the plugs once after it failed to start, but the plugs were dry.

Thanks, I'll try it out tomorrow and I'll check my codes.

Hmm... disreguard anything I said... HAHA