I took my car in for a exhaust leak. They say it was the bad hose coming from the air tube on the pass side ex. manifold. I don't know the exact terminology but each side has these coming off the top of manifold. Well I drive home and the car and it is running like a$$. Motor has alot of noise coming form it at mid rpm range. The temp get to around 240 degrees. I pop the hood and I see some smoke. It was coming from the pcv tube which goes into top of valve cover(it came out I guess). Then I notice smoke coming from the hose they replaced(the one coming off the tube from pass ex. manifold) So I touch the hose and it is too hot to even touch. Then I touch the metal valve thing forward of that(sorry I don't know real names) and it is even hotter. The driver side tube and valve arent even close to being as hot.

Why would it be running so hot? Clogged cat or something?

This is on a 96 6-speed Supercharged(powerdyne) Formula. Has 43,000 miles on it.
tia
Brandon

 

There are a couple of possibilites. One is that the check valve (what you call the metal valve) is bad, and allowing exhaust gasses to flow out of the manifold, and into the rubber hose. Since the hose was already replaced, there's a good chance that's why it failed. They should have though of that when they replaced it. The valve is there to allow air to flow from the AIR pump into the manifold, and to prevent exhaust from flowing out of the manifold when the AIR pump shuts off.

It is possible that you have added pressure in the exhaust system due to a plugged cat. That is easy to check with a pressure gauge in the O2 sensor bung.

As far as the PCV air supply tube coming off, is it possible you are having a problem with blowby on the rings, due to the S/C? That line normally supplies air from the TB to the valve cover, so the PCV system can pull the air through the crankcase to clean out the blowby. If you have excessive blowby, the pressure can start to build in the crankcase, and the vapor flow OUT of the valve cover into the TB. Enough pressure could blow the hose out of what is a fairly loose grommet. Or maybe they just knocked it off when they were working on the car.

How do you run the PCV valve? On some S/C setups you have to reroute the PCV vacuum source from the intake manifold to the inlet side of the blower ducting. How is yours set up?

 

Fred,
I am not sure how the PCV is routed, at work and cannot go check. Just got the car a month ago and the car had the blower. How hard is it to change the check valve? I think like you said the check valve is bad, that's prolly why the hose split in the first place. Would the check valve make a car run hotter?
You the man Fred