just got done fixing a squeal per my other thread. ended up being an exhaust manifold leak on the drivers side, cylinder 6.
now a new problem, rough idle and NO power. ramming the pedal through the firewall doesn't do anything! i'm doing good to make it up to 10 mph. it didn't run this way before i started this adventure, so i'm guessing that i screwed something up.
seems to start fine and idle great for the first few seconds (about 15), then starts idling rough. I think that there's a sensor somewhere sending a bad signal to the ECU, that's why it gets rough after it warms up. it used to rev up really fast when i opened the throttle by hand, and kick in the rev limiter almost immediately, now it takes 3-5 secs!
I have replaced alternator, PS pump, belt, idler pulley, camshaft synchronizer assy, coil pack, wires, and spark plugs.
I thought for sure that the cam sensor wasn't aligned correctly, so i've re-done it 3 times. the last time i just set it to TDC and slipped the alignment tool on to check it, lined up perfectly... also checked with o-scope, cam sensor sends signal between the 4 and 5 tooth on the crank sensor(using missing tooth as "0"). i'm absolutely certain that it was on the compression stroke, i removed the fan so that i could personally put my finger over the spark plug hole as i turned it over.
I've put three different sets of plugs in, the first were NGK iridium, the second two were autolite double plats. the new coil pack is a screamin' demon, and it didn't make any difference in the idle or power before or after changing it out, or with plugs at 0.060 (per their recommendation) or at the stock 0.046. stock 0.046 are on there now with a new set of NGK wires from napa and the demon coil.
this morning i checked fuel pressure, sitting around 40-50psi the entire time.
checked vacuum, running around 13"hg. tried removing/plugging all of the vacuum ports, no change in idle.
I'm wondering if i have a blockage in the exhaust, I have an exhaust back pressure gauge coming so that i can check that. i'm a little suspicious that an exhaust manifold leak could squeal like it did out of a gap in the gasket. every leak that i've head before has been a "tick tick tick" puffing sound.
I'm stumped, can you guys think of something else?
2002 Ford Ranger XLT
3.0L Flex Fuel Engine, Automatic Transmission