I posted this topic in the TBI forum as well. But as im not sure that it is definately the TBI im going to post it here too. All I know is that she is making a hella noise.

Here is the deal. Ive been helpin a buddy of mine put an Edelbrock performer intake on his 91 RS with a 305. We have a TBI adapter plate, and are using it. Got everything hooked up and timed, fired her off, and she started right up.. But the issue is this.

The TBI is wailing like a friggin banshee. It sounds like a siren or something. High pitched, and as it idles up the sound gets more intense. however, when you give it throttle, it quiets up a second until the throttle is off and its returning to idle. We have ran into alot of problems making this swap work, but it *SHOULD* be fine right now. What could cause it to wail like this?

ANY input is GREATLY appreciated.

Thanks in advance.
-steve

 

i have the same problem on my wifes 89 camaro with a tbi it just sounds like a wistling sound at idle. i am still looking for the cause.


keene

 

well this is no light whistle at idle, this is a HIGH pitched SCREAMING WAIL. very VERY loud.

-steve

 

well yesterday we went ahead and tested the intake manifold with the carb cleaner. Intake seems totally on the heads, cant find any problmes there. Everythign seems bolted down real good, cant tell any leaks on the manifold. Im worried about screwing down the two middle bolts, where we had to modify the manifold to the full torque specs because of the angle they are at.

We've been over all of the hoses, fairly thoroughly, cant seem to find any issues there either.

Went so far as to remove the belt off the serpentine setup and start car, ruled out accessorie drives and brackets, so that stuff is good. Sound sounds like its coming from the front of the manifold area, but to be honest i cant tell. When your on the driver side, it sounds like its coming from the passenger, and when your on the passenger it sounds like its coming from the driver side.

Worried about starting car and running, as we had let it run yesterday for a while and the tailpipes started shooting out fire, about 12 inches long from each exhaust outlet. Looked under car after we shut her down, everything from the Catalytic converter back was glowing orange. Cant be good.

Im gonna take the TBI off this evening and the Throttle body adapter plate, make sure its sealed down well. May even use silicone on top of the gaskets. Then re-assemble and see if it does it again.

Vacumn hose to MAP sensor makes car idle real real high when connected to back of throttle body. When disconnected it idles relatively well, a little rough, but VERY rich.

Thinking about saying screw the TBI and get a carb, and a fuel pressure regulator. Only problem with that is thats almost 400.00 and the TBI should be working we just dont know why its not.

Help.

Any help/insight is NEEDED and greatly appreciated.