[SIZE=2]OK, guys got the heads, and headers on, valves adjusted(eeeeeeeekk).... Got everything on, fluids in.......go to start it up, takes a few times cranking, then it fires right up............runs then stops after about 5 seconds....... checked all the fuel lines, wires, etc........no idea? fyi 3.0 v6 downey headers........ help i need to run it to the muffler shop ...............


should be in the 93 section......sorry clicked wrong area

 

is it running with open headers now???

 

Sounds like it's starved for fuel since it wouldn't run at all if it didn't have spark or air.

Is the fuel pump running? Do you have pressure on the rails? The "takes a few times cranking, then fires right up" sounds like it's havign problems getting fuel, then it gets enough to spurt, and once that's gone, it'll stop.

 

mine wouldnt run with open headers....

 

Yeah, open headers......dont know if the 02 sensor will shut anything off? But im definatley geting fuel my fuel leak proved that theres a lot up there........ but thats fixed.......... im at my whits end

 

Hmmm.. I can see the open header angle, but I know folks that have installed headers and then driven to an exhaust shop - just like you're looking to do. Mine runs without an O2 sensor - it runs lousy, but it runs.

Didn't see a previous mention of a fuel leak, but yeah, that would seem to say it's not fuel based.

What about the MAF (or the equivilent that you guys have)? I know that mine won't start at all with the MAF disconnected, but I I've had experiences where I know that there's a threshold where it will run crappy when there's unmetered air getting into the system. Our engines & ECUs are different of course, but this is a matter of straight-forward engine physics.

Can you keep it running if you jump on the throttle? Or feather it back & forth?

 

K, yeah mass air flow is hooked up, its brand new right before the heads/header swap.... everything ran fine started fine before, but just had burnt valves....... i can keep it running for a short period if i feather it if i romp on it maybe a few more seconds.... it wants to die a pooof put put put pooof then dies.......??

 

I have never had a car with this engine,
Is there no chance that you messed up the spark plugs ( firing order ) or that you need to adjust the ignation ?