I have an 03 roush 4.6L NA car, only mods done to it are CAI, Accufab 70mm TB and intake plenum, and exhaust. It threw a code last week for cam position sensor because it would backfire on start ups so I replaced that. I got a new ac system installed today, Just picked it up from the shop and on my way home getting it above 2k rpms it would start backfiring and hesitating. I came up on a stop sign and my car died and won’t start back up. I have all my lights and radio still works, the car just won’t crank over. What could this be? I have a new alternator in the mail should be here tomorrow.
In the Ford service manual the #1 item under "back fire" is secondary ignition.
A bad alternator isn't likely to prevent the motor from initially starting. But a bad battery could cause a crank with no start.
IMO it's could be a bad sign that the motor quit while running. This could be something as serious as a jumped timing chain. A compression test and/or cylinder leak down test could help rule in/out a base motor problem.
Hello lets start with I have a 97 mustang gt v8 standard I had new engine transmission ect put all new well last month i shut the car off and had no power at all bought a new battery and alternator got all power back but it wont ignite brought to mechnic for a month all sensors codes ect are fine