Hot starting issue on 360

A test at the rail would be the go.

Do you know if there is anything in the fuel system to hold pressure in the fuel rail Eddie?

I recently had this exact same problem with a friends car and I diagnosed a faulty fuel pressure reg. Replaced it and it fixed it. Car cranks first time, every time when hot.

But.............I have a faulty fuel pressure reg in one of my cars for over 8 yrs now. I rarely drive it, so I havent been too concerned about replacing it. I should have ordered one for it the same time I ordered one for my friends car.

Im such a malaka!

 

To me, that sounds like the first 1-2 secs of cranking is pressurizing the fuel rail. Then it starts straight up the 2nd time because the fuel system was just pressurized.

Has to be a fuel pressure issue.

My old Ford (with ****ed fuel reg), on first start up I crank that mother for a few secs, then I stop. I then hit the key again and it starts right up.

If I keep cranking the first time, it will eventually start after 15-20 secs. But its no good to crank the starter motor for that amount of time every time you want to start the car.

A few little cranks to build pressure up to the fuel rail, then stop to let starter cool for a second or two............then I fire the old girl up.

 

You know, when electronic components begin to fail it is heat related. Isolation of the component is diagnosed with a cooling spray. Buy a can of cooling spray at your local electronic shop. I suggest cooling the crank position sensors, etc., one at a time. The solution is very evident once the bad item is cooled and you get a fast start.

 

Oh, glad we got that cleared up then.

Nope, dont sound like a fuel pressure problem to me now.

And I dont think its a fuel injector issue either. But if they have never been cleaned and you have some miles on your car, send them out to be cleaned anyways.

Sounds electrical. Hopefully something simple, electronics can sometimes be a HUGE pain the ass to sort out.

 

My mechanic told me that a 360 will only turn over 6 times before it assumes there is a problem and will not start. It will continue to turn over but won't start.

 

I am having a very similar issue.

I was initially having cold starting issues then I decided to take my throttle body’s and airflow meters off to clean them, that went well all clean as a whistle. I then pulled the injectors and rails off and took them to my mechanics to have them cleaned professionally. They replaced the seals and filter baskets as part of the cleaning process.

Sooo how is this similar you ask?...... Well after all this cleaning my cold start is good but not my warm start. If I start it say 5min after turning it off its okay but say 30min (approx.) she tends to catch then stall followed by constant cranking for a bit. If i press the gas she starts quicker.

I pulled everything apart again to check connections and vacuume lines just to make sure and everything is fine, so I ended up pulling the injectors out today just had a feeling this was my issue. I was rite!!

Pulled the injectors out and they were wet, this is after the car has been sitting for over 12 hours. I dried the injectors and then turned the key to the on position, after a few short moments you could see fuel pooling on most injectors.

I have not replaced the injectors yet but doing some research on leaking injectors, my warm start issue seems to be commonly linked.

Not sure if this is/was your issue but I’m just shearing.

Sorry for rambling.

 

Nice bit of detective work there Pete. You may well have your problem right there!

 

Hey Mrpcar,

My car is a spider, not sure if the fuel is acrtually vapourising. I took the injectors and rails off again after i had warmed up the car (yes its hot be carfull) i done the same check and fuel was just pooling, i was expecting a hissing or something but nope.

Also i dont really notice smoke on start up just the smell of fuel for a little bit (only if i start the car and stand around the engine bay)

Thanks for the comment FerrariDublin!

 

Some computers like to see the crank angle sensor reporting a motor that is turning before they energize the fuel pump (for fire safety reasons after a crash)...and other computers need a dedicated roll over sensor to report that the car isnt upside down in order to energize the fuel pump (again, for fire safety).

Anyway, fatbillybob has the best suggestion. When hot, spray in starter fluid to see if she turns on immediately or not. That will identfy or rule out fuel pressure as your culprit.

Tests are good!

 

MrP, I'd expect a brief "poof" of black smoke if your problem was a leaky injector.

 

Hey Guys,

I changed the injectors and hot start problem solved! my warm starts are abit more rough tho.

 

Interesting Pete, thanks for sharing.

Did you have the old ones tested/cleaned by any chance to see their spray patterns or if they were leaking?