RBP

Took the car out for the first ride after winter storage.

I noticed a chirping sound and that the engine wants to stall as you slow down to stop. Seems like something is seizing. The engine runs nice except for this.

Anyone experience something like this? Could it be a fan bearing, alternator, steering?

Over the winter I removed the stock air filter and replaced it with the high flow cone (MAFS and other items all reinstalled). I also added a different exhaust from Fab Speed with low flow cats. There are no check engine lights

neunneundrei

I'm not sure about the chirping sound which may point to something else - but it could be your idle stabilizer. I used to run into a problem where the car would try to stall upon slowing down (or letting the engine revs drop quickly).

IXLR8

Those are easy enough to check by removing the belts and hand turning them.

You made some changes. Check those areas.

RBP

It seems to idle ok once it has settled but is a bit low. It seems to be a problem when dropping rpm to idle.

How would I check the idle stabalizer?

RBP

The problem seemed to be the fact that I plugged what looked to me like an open vacuum line when working on my car. The line is black, about the thickness of a showstring and located right around the distributor area. I took out the plug and it seems to be running pretty good now.

Anyone know what this line is and what its purpose is.? Should it be connected to something?

element

Do you have a pic?

neunneundrei

Sounds like a vaccuum line - which causes all sorts of things - but this is where someone with more experience needs to weigh in...

...and a pic would help...

IXLR8

Rudy, I e-mailed you a couple of pics.

Jeff96-993

That line went somewhere, and it's not where it's supposed to be now. Multiple choices on what it is, but I'd look at the distribution manifold behind the blower fan on the left side of engine compartment, and trace from there.

RBP

I will take a photo on the weekend and try posting it. The line is a hard shiny black plastic about the diameter of a shoestring liquorice. I found it connected to nothing with no ends or fittings on it.

Garth S

#1 .... if the stalling occurred on the first ride after winter hibernation - any chance that the battery had been disconnected? If so, most 993's will stall several times until they "readapt" - or one follows the readapt procedure on first start up ( I'd have to look it up, but it involved pushing the throttle to the floor with key on IIRC). Anyway, if it happens that the battery was out of circuit - you have now fixed your car .... and the vac line is a classic red herring ...

#2 ... as said, some good pics would help: there are 3 vacuum actuators in that area for the VRAM, and a solenoid operated vac valve directly over the distributor. The latter opens a vac line as you describe to actuate the vac actuator directly behind it. Also, there is a vac supply line coming out of the top rear left of the manifold.

RBP

See attached. The line is a vacuum line. The battery was disconnected for the winter. On driving to work the engine did not want to settle in idle from normal operating rpms. When I reopened the vacuum line (engine off) I could hear the air going back in. After this it ran fine. Here is a picture of the line.

Garth S

There should be a vac line ( as in your hand) inserted into the bottom of the solenoid valve to the left .... and a short length of the same line running from the second nipple on that solenoid to the diaphragm actuator on the right side of the pic.

I think it unlikely that the disconnection of that vac line was responsible for the stalling - see my first post 'rational'.

CalvinC4S

https://rennlist.com/forums/993-foru...ml#post9167748

Thats just a blower flap, not why the car is stalling.

Many 96 owners have been through this including myself.
Idles fine, falls flat when clutch is disengaged coming to a stop.

Being a 96, you probably disconnected the battery and wiped the ecu.
Car needs to re-adapt. Disconnect the battery for 15 minutes then reconnect it. Let the car idle for 15 minutes (be sure NOT to touch the throttle on start up or the full 15min).. should be good.

RBP

Interesting, figure I'll replug the vacuum line and try again.