Okay brett19 - great job on the info. Sorry the car broke down but the good is we are getting more info. So hang in there. You are doing a great job! . Thanks for that!
When you say the exhaust was glowing red. Was it the exhaust manifold or the catalytic converter?
Though I would like to wait until I get an answer before I suggest things. We will press anyway and kind of go back and forth and I will try not to have you do something you don't need too.
Please turn ignition off. Perform a visual inspection of the following. Check vacuum hoses for splits, kinks and proper routing. Check for leaks at throttle body, intake manifold, EGR valve and PCV system. Check PCM grounds for proper connection. Check injector harness connectors for proper installation.
I would really like to know what the fuel pressure is. You do this by: Turn ignition off. Install fuel pressure gauge. Start engine and allow it to idle. Fuel pressure should be 42-55 psi
Though you changed all of this, please make sure you get a good spark. Disconnect spark plug boot from companion cylinder at ignition coil housing and install a fused jumper wire between ground and spark plug connector at ignition coil housing (1-4 or 2-3). Crank engine and check for spark. Is there a spark present at all cylinders?
Turn ignition off. Remove spark plug boot assemblies from affected coil at IC housing. Connect a DVOM between the secondary ignition coil terminals (spark plug connectors 1-4 or 2-3) at ignition coil housing. Resistance should be 4000-8000 ohms. What is it?
Do you have an alarm system that was installed on the vehicle? After searching through about 200 TSBs, I saw this one?
Misfire DTCs P0300, P1380, P1381 and Catalytic Converter Damage Due to Installation of Alarm Systems
TECHNICAL SERVICE BULLETIN
Reference Number(s): 02-06-05-004b, Date of Issue: February 14, 2006
Affected Model(s): 2006 and Prior GM Passenger Cars and Light Duty Trucks; 2006 and Prior HUMMER H2, H3; 2006 and Prior Isuzu Light Duty Trucks
Supercedes: This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 02-06-05-004A (Section 06 - Engine/Propulsion System).
Related Ref Number(s): 02-06-05-004, 02-06-05-004A, 02-06-05-004B
General Motors Engineering, in an effort to determine the root cause of catalytic converter damage, has determined that aftermarket alarm systems incorrectly installed in vehicles have the potential to cause misfire codes and damage to the converter. These alarm systems use a circuit interrupt which utilizes the ignition circuit on the vehicles.
You may be running rich - so that is what I need to know what item on the exhaust is glowing red? If you want to at least get back with me on that before you do the other things that is okay.
Thank you BlueMystc5 for your suggestion. He may have that but we need to do a few more checks to make sure.
Sunday, March 8th, 2009 AT 7:01 PM