I dont have no friggen exhaust leak!
finally got my front manifold off.
Now that would probably explain why I am running just a tad on the rich side, even though according to the scan tool it is rapidly switching between rich and lean several times a second. either way I'd imagine this would cause a problem where a bunch of exhaust was sneaking out thru the cracks and not being metered by the O2 sensor. I'd also assume if I was running rich the PCM would put more fuel in the system and that would cause predetonation as well.
Another thing, with the cracks of this size, you can hear the exhaust leak fairly well, not sure if it is loud enough or the right frequency to trick the knock sensor into thinking its knock but it sure could be. Just a theory.
Took me about 1 hour to get it off, one broken thing..a vaccum hose for the fuel canistor. It was cracked to all hell anyway.
The rear Core I had ported did not turn out, the threads in the crossover connection are trashed and already stripped one of the new bolts I got, so I might have to play with it for a while but for now it looks like the front is the worst and that is what is going on for the time being.
Same thing with the one on the car, it strips the threads pretty bad off the crossover bolts...but only the same outside one. I've sprayed the crap out of it with PB blaster, no go...used several different kinds of wire brushes..no go....a needle to clean out the threads..no go. oh well.
I dont feel real bad about not doing the rear RIGHT NOW because first of all they dont have much weld to port out from the factory and they outflow the series 2 rear manis. I doubt there are any serious bad cracks back there since the core i ported did not have a single crack. I have looked the rear over on the car pretty good, cannot find any signs of a crack. the ported from mani should do for a while.
Oh and how the hell am i supposed to get a torque wrench in there..if i use a swivel socket it will throw the torque off slightly, not sure which direction. Keep in mind NOTHING was removed to get the manifolds out except the cruise control modulator or whatever its called.
Finally I am wondering if I should or need to put the heatsheild back on
It does not seem to serve much of a purpose IMO. the shielding is on the bottom but heat rises right?