89mustanglx306

i have a 89 mustang lx i bought a new engine 302 block bored over 4 and when i put my new engine in for some reson my headers glow red hot and i can actually see flames lighting the inside of them up someone please help me i tryed setting the timing its a 10* btdcand it still does it it also causes the car to eventually over heat but there ne hestitaing or nething not sure of power loss scared to drive it and ruin my new engine ive also baught ne fuel injectors incase they were bad i now have a new fuel pressure regulator and pressure gauge coming

1991LX5.0

your running to rich

89mustanglx306

whats the best way to fix that and what usually causes it

w8less

i was always told this is a timing issuse

whats ur timing set at? did you stab your distributer correctly?

https://mustangforums.com/m_3264510/tm.htm

Chopper

There's a sensor that's not connected or is sending a faulty signal.
At what engine speed is this happening?
The O2 sensors could be reading a lean mixture and causing the ECM to pour fuel into the engine.
Make sure on the timing.If it's set too far after TDC it can cause this also.I wouldn't use the timing marks on the damper for this since this is a different engine.Pull out the number one plug and make sure of the timing mark's accuracy.

89mustanglx306

the mark on damper is dead on i used a straw to make sure my piston was completely up on the compression stroke then i installed the dizzy then set the timing to 10* btdc i dont think it would be a sensor cause i used all of my original sensors and they were in good working order befor i started ill have to find an ohm meter and test them does anyone know what it should read andyou can see the light inside the headersat any engine speed above 1200 rpm

89mustanglx306

ive decided to just try converting it to mass air if any one has mass air sensor computer and harness for sale lemme no and we can work something out

1991LX5.0

yep, usually its either a timing issue or running to rich, since he said he set it at 10* btdc which is pretty conservative im assuming its running too rich.

I dont know much about speed density, you might want to try asking this in the 5.0 tech section to see if you can get someone who can help out

ktm300

are you running cats? they might be clogged or there could be a broken piece of the honeycomb sitting sideways and blocking flow.

89mustanglx306

yea i do have cats on it for emission purposes but they were fine befor the swap whats the best way to check them and i can feel plenty of exhaust coming out the rear