PLEASE HELP@!!!!!!!!!!!!!!!!!!

[devildogcollier]

ok....... ive got a 95 lt1 6-speed....

my cars [B]has been[B] running fine until about 4 days ago. i drove from my house to drop off my wife at work (only a 15-20) minuted drive there and back.
i noticed that when i started the car in the morning it made a kind of whistleing sound at first but went away quickly.(like air being sucked or pushed). on my way home i noticed that i was losing speed and overall power when i was going up hill. within a few minutes i was on my street to my house and had to stop at a sign. once i put it in first and gave it gas it rolled out like normal but once i hit 3k rpm goin from 2-3 gear the engine BOGGED down and i could not get above 1.5-2k rpm. i barely got home and could not push the car past 30 miles and hour.(and that was a struggle) i parrked the car and left it alone for the night... next day i did what i could to check the catylitic converter (seemed fine) put fuel injector cleaner through the car......still ran the same as before... problem

when the engine is (cold) the car can rev to over 4k with no problem!! this is what happens at opperating temp : when the car idles it makes a high pitched whistling sound. as you press the gas and the rpm goes up so does the noise (gets louder). i followed the intake hoses and vacum hoses and could not find any leaks..... HOWEVER... once i sprayed a little wd-40 around the manifold gasket, the noise stopped completely until the 40 was sucked through..... any OTHER IDEAS AS TO WHAT MY PROBLEM MIGHT BE??????

[CamaroSpike23]

where at on the manifold were you spraying?

sounds like you've got a vacuum leak. find out where its at and get it sealed up

[devildogcollier]

i was spraying under the injectors, by where the manifold meets the heads. under the number 5 and 7 injector

[CamaroSpike23]

check the bolts on the intake manifold, also check the seals on the injectors themselves.

[devildogcollier]

talking about where the injector inters the fuel rail......i checked em and they looked fine....havent checked the bolts yet though...i will later.....oh... question.... on the bottom of the injector where it inters the manifold.... i have small yellow "plastic rings" what purpose do they serve???? are they seals???

[radz28]

I don't recall what the plastic rings are for, that's kinda' weird. Also, make sure the intake elbow in front of the throttle body is on square and checking it for any holes or leaks. I had one where the hose clamp actually pinched the hose, cut a hole into it, left a vacuum leak, and had to be replaced. I don't recall the syptoms were quite a match to yours but since it got better when you sprayed the WD40, I'd stick to where you're going with this.

[radz28]

You know, aren't there a bunch of grommets and such in that area on that intake manifold too, like the PCV valve, and maybe another crankcase breather hose or something. Check to make sure they haven't fallen apart or leaking too while you have everything apart.

[devildogcollier]

yeah , theres quite a few hoses and such on the driver side of the manifold mostly,,,,also a lot of brackets and crap like that..just hope i can remember how to put everything back on......where they BELONG ...

[CamaroSpike23]

any updates?

[MerF]

I know this is slightly necro'd, but I have to put in my $0.02 and offer that it's gotta be something with the emissions. If it's fine in closed loop but starts sucking air when it goes to open loop, I'm thinking something in the exhause recirc system is sticking to allow clean air into the engine without it being metered.

[lil_red_v6]

have you check to make sure your gaskets are good?

[camaro5]

Originally Posted by devildogcollier

ok....... ive got a 95 lt1 6-speed....

my cars [B]has been[B] running fine until about 4 days ago. i drove from my house to drop off my wife at work (only a 15-20) minuted drive there and back.
i noticed that when i started the car in the morning it made a kind of whistleing sound at first but went away quickly.(like air being sucked or pushed). on my way home i noticed that i was losing speed and overall power when i was going up hill. within a few minutes i was on my street to my house and had to stop at a sign. once i put it in first and gave it gas it rolled out like normal but once i hit 3k rpm goin from 2-3 gear the engine BOGGED down and i could not get above 1.5-2k rpm. i barely got home and could not push the car past 30 miles and hour.(and that was a struggle) i parrked the car and left it alone for the night... next day i did what i could to check the catylitic converter (seemed fine) put fuel injector cleaner through the car......still ran the same as before... problem

when the engine is (cold) the car can rev to over 4k with no problem!! this is what happens at opperating temp : when the car idles it makes a high pitched whistling sound. as you press the gas and the rpm goes up so does the noise (gets louder). i followed the intake hoses and vacum hoses and could not find any leaks..... HOWEVER... once i sprayed a little wd-40 around the manifold gasket, the noise stopped completely until the 40 was sucked through..... any OTHER IDEAS AS TO WHAT MY PROBLEM MIGHT BE??????

Your diagnosis is clear, with a 90% probability.

Intake gasket(s) leaking.

[CamaroSpike23]

Originally Posted by MerF

I know this is slightly necro'd, but I have to put in my $0.02 and offer that it's gotta be something with the emissions. If it's fine in closed loop but starts sucking air when it goes to open loop, I'm thinking something in the exhause recirc system is sticking to allow clean air into the engine without it being metered.

open loop = no readings from the o2s and other equipment
closed loop = readings from everything

however, the AIR system pumps air into the exhaust stream to help heat up the catalytic converter when the car is first started. the hiss that he heard when he first started the car would be that, but the AIR pump only runs for a very short time. but the EGR does not differentiate between open and closed loop. it is actuated by a solenoid from the computer to open the egr valve to allow more exhaust into the intake to decrease emissions.

however his problem is a leak on the intake manifold gasket/fuel injector o-ring. he and I have been pm'ing each other about this and he got new intake manifold gaskets but he never told me if he got new injector o-rings as well.

[devildogcollier]

ok.... well i got the new intake gaskets on there and used a little bit of copper spray for tack, made a GREAT bead of sealant around the block (ESP. around the oil valve) changed the o-rings on the fuel injectors....and guess what !!!!!


CAR STILL RUNS LIKE CRAP!!!!!! i dont know what to do, im gonna have to break down and get it towed somewhere. sound seems to be comming from ONLY the valve cover or the headers on drivers side of engine i cant pinpoint it .... still not sure ..... thanks for yalls help !!!!!!!

car is starting to depress me ..


semper fi