Hey ya'll. Im a newbie on this forum. I have a bad engine miss on my 99 prerunner. Here's a little background....
99 PreRunner 2.7L
319,000 mi. ( 125k on engine)
replaced radiator (20k ago)
CEL : coded p0420 for 10k miles or so.
New wireset, new denso plugs, new twin coil packs, new fuel filter
Recently started experiencing a bad miss. Pulled a p0301 misfire code. Changed the plugs, wires, fuel filter and "seafoamed" the intake via the brake booster vacuum.
Did compression test today. Numbers all over the plce. Not exactly sure if i did it right.... pulled efi fuse and relay then turned the engine over for 7 seconds. Then recorded my #'s one at a time after 6 seconds crank on each cylinder test.
#1 - 99
Used jumper cables to keep battery hot...
Do i need to crank it for a longer period if time for each cylinder? Or could it really be that bad?
I use BG44K fuel treatment monthly.
i am open to any and all help.
Thank you all!