01-26-2016, 06:38 AM
Join Date: Mar 2014
Location: El Paso, TX
Total Cats: 0
VVT Swap into 2000; Random Misfire Code
Thanks to Savington's awesome VVT swap thread, I decided to replace my NB1 engine with a blown head gasket with a low milage 2003 engine.
Amazingly, the car started right up with the stock (2000) ECU. Since I'm overdue for my state inspection (TX), I drove around to get my ready codes ready and no issues, save for an occasional high idle (1200-1300) at red lights. However, on my way to the inspection station I received a P0300 random misfire code... I noticed a strong drop in power/engine response right before the code, so perhaps if I let off the gas I could have avoided it.
Possibly pertinent info:
Using 2003 COPs
New NGK spark plugs (heat range 5 and gap checked to 1mm ~.04)
New Magnecor plug wires
Crank angle sensor measured within spec
Using 2003 injectors (possibly running rich?)
Installed DW200 fuel pump (too much fuel pressure?)
Running 91 Octane
VICS intake manifold
Any ideas what could have caused this?
If I can't figure it out, I'll just drive circles around the inspection station until the ready codes are good and cross my fingers. Afterwards the MS3 goes in, which should hopefully resolve the issue if it's due to the 2003 injectors causing me to run rich.
Thanks for your help!