Car dies after it gets hot,after cool down will start???

[268RTs4ME]

My 74 b body 440 thermo. starts good will run for about ten minutes then shut down,  will crank but will not start, let it cool down and will start up again..have changed control box on dash (module box) same thing, anybody got any ideas? Thanks

[Ghoste]

I did have an ecu fail once and the one I replaced it with was bad out of the box.  Do you have a known good one? (I don't recall it as running for ten minutes and quitting though)

[elacruze]

Could be as simple as the coil.

[BMOTOXSTAR]

I have the samep roblem with my 74' Satellite. I replaced all the stuff, coil, ignition box, etc...still does the same thing. I am think it could be the carb?

[elacruze]

How hot does the carb get? Maybe you're heatsoaking and vapor locking the carb.

[Brock Samson]

starter hint sink and vapor lock,.. i used to have both problems...

[resq302]

I had the same problem and it turned out to be the pick up coil inside the distributor.

[268RTs4ME]

Have replaced control box, coil, and still about ten minutes just shuts off, carb will still pump gas, gonna put in pick in dist. Any other ideas?

[mally69]

Could be as simple as the coil.

I second this, mine just did this same thing about a month ago, i put in a new coil and i had no more trouble 

[jaak]

I had a similar problem in my 69----Bad ECU
Also had similar problem in my 73----Bad Coil

Jason

[BMOTOXSTAR]

I have done all as well, electrical, fuel, pumps fuel, not over heating.
I am going to try the pick up coil, man that thing looks like a bee-itch to take off the dist.

[268RTs4ME]

So far I have replaced coil, control box ECU, and Pickup in dist, new wires new cap, new rotor, I am beginning to think it might be carb, not fuel to carb, because when it cuts off I am still pumpin fuel when I work throttle??

[Nacho-RT74]

I'm quite often having starting issue when hot after sometime with car off. Need to quickly get back the key untill I feel some small backfire and then will start up.

However if car is "hot", turn off, but allmost inmediatelly turn back on, will start up right away

Some time ( very weird when that happens ) at first start up in the morning, will turn on when key is released. An not, is not ballast, because if it was ballast, the brake ligh at dash wouldn't keep on ( but dimmed ). Remember cluster and  ECU are being feeded through ballast, not directly from Blue wire like in RUN at START up moment, so if brake light at cluster keeps ON everyhing feed by ballast is being feeded the same and ballast is good.

my two suspicious parts are ECU related. One is ground at ECU, and the other is simply damaged ECU.

Another suspicious stuff is maybe coil... once got a bad dent when once my stock dist got stuck ( bad quality dist shaft bushings ) and vacuum hit the coil.

I have doubts about ground at ECU cause is not anymore loosen from firewall. Firewall holes were striped so I made a notch on firewall to fit a J nut in place of the original ECU hole. Unnoticeable from exterior, unles you notive the small gap between back of ECU and firewall.

just try to share experiences. I don't have the real solution on my or your problem

[elacruze]

Ok, let's get serious.

First find out if you still have spark when the engine quits. Use a spare plug or a screwdriver in the boot and air gap to a valve cover or something.

Next test how much fuel the pump is providing to the carb. The pump takes fuel from the lowest point so you'll squirt fuel even after you've run out at the jets. Don't assume that because you have _some_ fuel to the carb that you have enough volume or any pressure. If you don't know the history of the pump, replace it anyway as they're inexpensive.

If you have good spark and pump delivery, suspect the inlet valve/float. The valve could be plugged with debris, or the float could be stuck.

Do you have any inline fuel filters? Don't overlook the obvious. Replace them if there is any doubt.

[BMOTOXSTAR]

Yeah, mine still pumps fuel after it stalls. I believe that 7lbs of pressure is cvorrect out of the stock fuel pump?
I am going to try that pick up coil.

[268RTs4ME]

will try fuel pump tommorrow. thaznks

[mally69]

Hey what is the configuration of your fuel line from the pump to the carb is there any way it could be vapor locking?  just an idea guys