The engine (13B) was rebuilt and had a Racing Beat Header and straight pipe on it. I swapped headers and stock exaust to try and get it legal. It was running great but when I swapped mufflers it did something very weird. It would start for about 45 seconds then die. Then start for 20 seconds and die and then 10 sec and die, 5 sec and die, and then just fire and die and fire and die. Only thing I touched was the headers, muffler and actuaters to get the header off.

Changed fuel filter, added injector cleaner, checked plugs and they are new but are dark at the ends. Disconnected the muffler so its not a clogged muffler. Could it be a sensor, injector, or vacumm line? It runs great but does the same sequence of starts and dies for the last few weekends. Don't know where to start.

Any help is appreciated.

 

did u reconnect the o2 sensor??? or maybe its bad...

 

I'll check that again. I'll also be checking the air flow meter and all of the vacuum lines again.

 

You need to check the hose running from the bottom of the air intake tube to the bypass air valve. If this is left off the engine will do exactly what yours is doing. The air intake system needs to be completely installed before trying to start the engine.

 

Thanks. I'll try that also this weekend. Car is at my brothers house. Reading up on everything and getting lots of ideas before heading there to tackle it.