Engine cut off???

[McSteveGsxy]

Just finnished an engine install. Let the car idle for about 20 minuts. Every thing seamed to be running ok other than a slightly high idle. Hopped in to take it for a quick test drive around the block and on our way back the engine just cut off. Restarted the car and it ran for about 4 seconds and just cut right back off. Now it will start right up and run for about 4 seconds and cut off again. No sounds or simtoms just cuts off spark after about 4 seconds. Even after letting the car cool off completly, it's still doing the same thing. Can any one help me figure out what is causing this?

 

[phunny]

You check for any massive boost leaks? IC piping etc.

 

[motozachl]

Jump timing? Ran out of fuel? Zero fuel pressure? Fouled plugs? Can be anything, need more information to diagnose

 

[McSteveGsxy]

We have spark without any studder or hesatation and no major boost leaks. But I'm not recirculating the BOV.

 

[McSteveGsxy]

also just put in a new walbro 255 fule pump and sending unit. Due to rusted sending unit. It's like the computer is sending a kill to the ignition?

 

[McSteveGsxy]

It has good fule presure/volume and the injectors are pulsating. Would the factory alarm have anything to do with it? Or be in some sort of limpmode? Unhooked the battery cables for about 15 minuts and tried it againe and its still the same.

 

[motozachl]

If spark and fuel are check then run that compression test

 

[scott90gsx420]

Pull the ecu and smell it .. If it fried it will smell really weird.. You can open it too and look for burn marks on it too but smelling it works ..

 

[rlacasse1]

Is that Walbro overrunning you stock Fuel Pressure Regulator? I know some people have no issue but others have non stop issues with a Walbro and the stock regulator.

 

[McSteveGsxy]

It has very good conpression. Did a compression test and leakdown test. Both teste came back perfect. I am going to search the harness for any broken wires and check out the ecu and see if it is usable and if it can be flashed

 

[Jedicurlz]

yeah check for boost leaks in the ic piping and check your fuel filter and pcv valve... i changed all that and it worked perfectly