I got my new 306 installed and for the past 2 days have been playing around with timeing, fuel pressure, checking for vaccum leaks, etc etc etc. What the car is physically doing is it starts really good when cold and holds idle at 800-900 rpm. Then when everything warms up it starts to surge and then it dies but when i hit the gas pedal it revs up ok and after that it comes back down again and starts to stall out when warm.
I changed the IAC for a new one, set the TPS sensor voltage to between .997-.999, set the fuel pressure to about 40 PSI, timeing is at around 12 degrees. You'll see the specs for my engine in my sig with the cam specs. The cam itself is a fairly lumpy idle cam with duration less than 220 degrees. My engine vacume is at about 10-15 inches at idle when cold before the engine starts to idle rough and stall. Engine is at 10.1 and im running a mix of 6 gallons of 87 octane from before i did the swap and a fresh 6 gallons of 93 octane. I gapped my plugs to .050" becuase originally had the gap at .060" and checked plugs to find them carbon caked and smelling like gas indicateing a pig rich condition after running the engine for a whole 5-10 min.
Could this be an issue with an exhuast leak even in the area of the headers or my x-pipe? I basically carried over all my sensors from the stock 160,000 motor i had in the car before with the exception of the ACT sensor. TEMP sensor, IAC valve. I also recalibrated the MAF for the 24lb injectors. Im at somewhat of a loss here and im about to give the car to my mechanic to figure this all out but any last minute suggestions would be good to possibley aviod haveing this issue solved. Go figure I can install and engine and get it run right but i cant get it to hold idle!
I changed the IAC for a new one, set the TPS sensor voltage to between .997-.999, set the fuel pressure to about 40 PSI, timeing is at around 12 degrees. You'll see the specs for my engine in my sig with the cam specs. The cam itself is a fairly lumpy idle cam with duration less than 220 degrees. My engine vacume is at about 10-15 inches at idle when cold before the engine starts to idle rough and stall. Engine is at 10.1 and im running a mix of 6 gallons of 87 octane from before i did the swap and a fresh 6 gallons of 93 octane. I gapped my plugs to .050" becuase originally had the gap at .060" and checked plugs to find them carbon caked and smelling like gas indicateing a pig rich condition after running the engine for a whole 5-10 min.
Could this be an issue with an exhuast leak even in the area of the headers or my x-pipe? I basically carried over all my sensors from the stock 160,000 motor i had in the car before with the exception of the ACT sensor. TEMP sensor, IAC valve. I also recalibrated the MAF for the 24lb injectors. Im at somewhat of a loss here and im about to give the car to my mechanic to figure this all out but any last minute suggestions would be good to possibley aviod haveing this issue solved. Go figure I can install and engine and get it run right but i cant get it to hold idle!