OK, well I took my UIM off the other day to swap to one that I had painted up all nice and pretty Anyway, when I put it all back together, the car wouldnt hold an idle. It would just start, then die. I could give it gas and keep it running, but it was running very rough below 4k and backfiring when i let off the gas. I re-used the old manifold gaskets, so i just figured that was the problem, it was leaking around there. So I ordered new gaskets, they acme in today and I took it off and replaced the gaskets. It is still doing the same exact thing. Heres the weird thing, if i rev above 4krpms, there is a fairly loud "whistle" coming from the engine bay somewhere. It gets louder as the rpms climb, and I cant hear it below 4k. I know this sounds like a vacuum leak, but I am 99% sure there are no leaks, as Ive taken the manifold off countless times, I know what Im doing. Does anyone have a clue as to what this could be, or maybe an area leaking vacuum where I could have overlooked? It will not idle at all... Thanks

 

It's either a vacuum leak, or the TPS is unplugged.

 

TPS plugged in.....and fairly certain it isnt a vacuum leak, but I could be mistaken, Ill check over it again. Being that it ran fine before I swapped the manifolds, a vacuum leak would be the most probable cause, but I checked and re-checked everything...

 

Sometimes it's easy to miss something obvious. Been there, done that.

 

i'd almost garauntee if its wisting its a vacuum leak. have someone listen around while you rev it.

 

I had the same problem, same scenario, sometime ago. Vacuum leak at the Air Flow Sensor where It joins at the Air Induct. This due to a lack of a hose clamp. Sounds like an air leak.

 

Yea, its a high pitched "squeal" almost, really weird. I would have someone listen, but alas I have no friends

 

Mine started to make that faint whistle sound a few months ago and I didn't think much of it. It ran perfect and wasn't a vacuum leak - It would make the faint whistle above 3k rpm.....now there's no compression- I'm wondering about the oil injection.

 

Ok, Ive taken the entire IM off and reassembled, checking every line and making sure everything was ok. It is not a vacuum leak. I think its a problem with the TB butterflies, because it only whistles when they are open above a certain point. What would cause this, and make it not idle, I have no idea? Any Suggestions? Its not a faint whistle that you have to listen for, its very loud. Any help would be appreciated

 

Well, I was there today, and I'm telling you people, this is one of the weirdest problems I've seen. The whistle seems to be most prominent when you rev it, and let off,and the butterflyies on top close.... I pinched every vac line, and nothing changed. Myself, I'm convinced the problem is actually in the throttle body itself, something with the postion of these butterlfies. The engine isn't getting enough air at low rpms(up to about 3500 or so) but all of a sudden above that it will rev fine.

Definately a gremlin of some sort, pisses me off and it's not even my car.

Something is changing when the throttle body is removed and reinstalled. Some adjustment somewhere is off. I've never seen a TB with a more complicated set-up than this, no wonder.

We'll get it man, sooner or later.

 

bump chicka bow whaaw

 

I found awhile Installing my FD Alternator, that the Alternator would accidently disconnect the Water Thermo Sensor found at the back of the Water Pump. Just a thought. I still however believe you have an air leak though...

 

Im fairly certain the water thermo sensor is still connected, would that cause idle issues anyway? I would assume vacuum leak also, but after this 3rd time removing the manifold and everything, Im certain everything is in tact. Ive never heard of anything like this, but I think there is a problem with the TB Butterflies, and Im going to get another TB and try swapping. Id like to hear any other opinions though.....

 

Oh yeah. And at this time of year, north as we are, it makes starting and warming up the car very difficult (had a broken wts last winter.)

 

At least get some starting fluid and spray around the end of every hose. If you are certain it is not a vacuum leak, at least do this so we can eliminate it also.

 

OK, I will do that. Truthfully I hope I find a vacuum leak, as at least then Ill know what the problem is and be able to fix it. As of know Im clueless...

 

my car is doing the exact same thing, it will not idle, and runns rough under 2k rpm... did you ever figure out the problem?

 

Not yet, I have ordered a bunch of new gaskets as well as injector grommets, Ill let you know if it fixed it whenever I stop being lazy and put them in..

 

i replaced the throttle body gasket cause and the squeel seemed to die down dramatically, but it is still there and won't idle...

 

i found the whistling hoses, on mine it was the vaccum lines that go to the oil lines on the intake mannifold, they were cracked to hell...
it no longer whistles, but still won't idle... any ideas?

 

I am resurrecting this thread 'cause I am having the same problem after replacing the oil injector lines and putting everything back together again. Where is the vacuum leak or is this a more serious issue? I don't want speculation, anyone found the source of the probolem and solved the cause of the high pitched squeal?

 

dammit i just got my car together and the same **** is happening to mine.

someone needs to figure this out. ill keep poking around and let ppl know what i find but im stumped. i just replaced every vacuum line on the car during the teardown.

 

you guys need to buy starter fluid or something, have your car on and start spraying around the intake pipe and intake manifolds. where to spray? where the the intake starts after the AFM, before the TB, UIM to LIM, LIM to block.

 

tomorrow. i had no help tonight, and the car wouldnt stay running long enough for me to spray anything.

 

try adjusting the idle screw on top of the throttle body. turning to the left to open... try starting it again, should idle higher.