Super long story short, I'm getting my '97 L67 LeSabre on the road, by the end of the month. It's got some issues:
1. hard to start, when it does the idle hunts
2. When idle is low/about to die, obscene whine noise is low.
3. When idle is high as pcm attempts to pcm, obscene whine noise is very fucking loud.
4. Best way to describe the noise is loud as fuck - compared to a whistle if blowing on the whistle is the noise the L67 makes under boost then this noise is what a whistle sounds like when you suck on it instead. But it's fucking mega loud, like 10x's louder than no air filter while under boost.
5. Noise appears to be coming from inside the crankcase and the intake, I used a tube to my ear to try and isolate it, can't find anything worth while.
6. Noise is by far the loudest with the throttle plate closed.
7. If I unplug MAS, starts super easy and the idle is consistent and the noise is consistent - but still loud.
8. Fresh rebuilt trans has reverse and either 2nd or 3rd only...
So, suspecting at least a vacuum leak... I ripped off the top end down to the plenum gasket, where I found that some idiot, I suspect drunk me, forgot to finish cleaning off the old gasket material on the blower near the supercharger inlet, effectively giving me two gasket thicknesses on the inlet side of the blower and only one on the nose drive side. So, you know, minor vacuum leak.
How the hell does this minor vacuum leak equate to intake whine louder than a 747 accelerating down a runway? I mean, sure, vacuum leak means un-metered air and explains the idle surging and MAS behavior. But this whining noise is louder than the open exhaust on this car... Debating, now that I've cleaned up the gasket shit properly, if I should just slap this shit back together and see what happens or if I need to go any deeper into the motor. Not much else I can think of that could be a factor - AC Delco LIM gaskets and new head gaskets that not-drunk-me specifically remembers installing...
Also, any insight on where to start with the new trans is good. In case you didn't guess, this car is Frankenstein-ed. 2002 L67 from a Bonneville (NIC cam and supporting head/valvetrain mods will get a 3.25 pulley once I get this shit fixed), 1998 4t65HD, 1998 NA harness with ZZP l67 swap kit harness. The thing that bothers me is that if it the trans has 2nd gear that at the very least 1st gear must be working as well, so makes me think it's something with the pcm, harness, or the valve body rather than any of the 300M hard parts or piston seals or the stupid nylon trans seals on the input drum...
1. hard to start, when it does the idle hunts
2. When idle is low/about to die, obscene whine noise is low.
3. When idle is high as pcm attempts to pcm, obscene whine noise is very fucking loud.
4. Best way to describe the noise is loud as fuck - compared to a whistle if blowing on the whistle is the noise the L67 makes under boost then this noise is what a whistle sounds like when you suck on it instead. But it's fucking mega loud, like 10x's louder than no air filter while under boost.
5. Noise appears to be coming from inside the crankcase and the intake, I used a tube to my ear to try and isolate it, can't find anything worth while.
6. Noise is by far the loudest with the throttle plate closed.
7. If I unplug MAS, starts super easy and the idle is consistent and the noise is consistent - but still loud.
8. Fresh rebuilt trans has reverse and either 2nd or 3rd only...
So, suspecting at least a vacuum leak... I ripped off the top end down to the plenum gasket, where I found that some idiot, I suspect drunk me, forgot to finish cleaning off the old gasket material on the blower near the supercharger inlet, effectively giving me two gasket thicknesses on the inlet side of the blower and only one on the nose drive side. So, you know, minor vacuum leak.
How the hell does this minor vacuum leak equate to intake whine louder than a 747 accelerating down a runway? I mean, sure, vacuum leak means un-metered air and explains the idle surging and MAS behavior. But this whining noise is louder than the open exhaust on this car... Debating, now that I've cleaned up the gasket shit properly, if I should just slap this shit back together and see what happens or if I need to go any deeper into the motor. Not much else I can think of that could be a factor - AC Delco LIM gaskets and new head gaskets that not-drunk-me specifically remembers installing...
Also, any insight on where to start with the new trans is good. In case you didn't guess, this car is Frankenstein-ed. 2002 L67 from a Bonneville (NIC cam and supporting head/valvetrain mods will get a 3.25 pulley once I get this shit fixed), 1998 4t65HD, 1998 NA harness with ZZP l67 swap kit harness. The thing that bothers me is that if it the trans has 2nd gear that at the very least 1st gear must be working as well, so makes me think it's something with the pcm, harness, or the valve body rather than any of the 300M hard parts or piston seals or the stupid nylon trans seals on the input drum...