Exhaust Smell While Ac Or Heat Is On - Taurus Car Club of America : Ford Taurus Forum
 
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post #1 of 6 (permalink) Old 10-07-2007, 04:15 AM Thread Starter
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I am getting a slight smell of exhaust fumes while I have the ac or heat on. Has anyone else had this problem? Its a 2001 se sedan
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post #2 of 6 (permalink) Old 10-07-2007, 11:37 AM
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When i bought my car from a dealership they cut one of the o-rings when they were changing all the fluids and they changed it when they did cause it smelled like gas when the a/c was on. I have a 1999 Vulcan.
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post #3 of 6 (permalink) Old 07-26-2011, 12:10 PM
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Smile Exhaust Smell - Check the PCV tube rubber elbows

I took my 2000 Sable 24V to the dealer for the exhaust smell I noticed when the car was stopped and the heat was on or (to a lesser extent) the AC was on.

They found nothing (which blew me away, since I figured they would want to sell me a new exhaust system - Freedom Ford, Norfolk VA.)

I actually bought a carbon monoxide detector, with a digital readout to measure the CO in the passenger compartment, but there was zero.

So, I took a second look at the engine and noticed that the rubber elbows on BOTH crankcase breather tubes had rotted away. The elbow on the rear cylinder bank was completely broken and the tube was dangling from the other end where it connects to the throttle body.

The front elbow had 1/4 inch hole on the underside where you wouldn't normally be able to see it.
I replaced both elbows, using old spark plug boots that had a right angle bend and they fit perfectly.

Replacing the PCV breather tube elbows (PCV vent) solved the problem, no more smell.
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post #4 of 6 (permalink) Old 07-26-2011, 12:17 PM
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Smile Solved: Exhuast Smell When heat is on and car is stopped.

I took my 2000 Sable 24V Duratech to the dealer for the exhaust smell I noticed when the car was stopped and the heat was on or (to a lesser extent) the AC was on.

They found nothing (which blew me away, since I figured they would want to sell me a new exhaust system - Freedom Ford, Norfolk VA.)

I actually bought a carbon monoxide detector, with a digital readout to measure the CO in the passenger compartment, but there was zero.

So, I took a second look at the engine and noticed that the rubber elbows on BOTH crankcase breather tubes had rotted away. The elbow on the rear cylinder bank was completely broken and the tube was dangling from the other end where it connects to the throttle body.

The front elbow had 1/4 inch hole on the underside where you wouldn't normally be able to see it.
I replaced both elbows, using old spark plug boots that had a right angle bend and they fit perfectly.

Replacing the PCV breather tube elbows (PCV vent) solved the problem, no more smell.
Both tubes connect the throttle body and are about 12 inches long. The other end, where mine rotted away, connect to the top of the cylinder bank valve covers.
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post #5 of 6 (permalink) Old 07-26-2011, 01:06 PM
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If you use max a/c it will recirc and not pull through the cabin filter and will eliminate most of that smell probably. Not trying to push aside your problem, but i know the smell itself could be a problem also for the passengers.

1999 Vulcan Sedan with 145k+
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post #6 of 6 (permalink) Old 07-26-2011, 01:20 PM
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Fresh air hose

Quote:
Originally Posted by 2000SableOwner View Post
I took my 2000 Sable 24V Duratech to the dealer for the exhaust smell I noticed when the car was stopped and the heat was on or (to a lesser extent) the AC was on.

They found nothing (which blew me away, since I figured they would want to sell me a new exhaust system - Freedom Ford, Norfolk VA.)

I actually bought a carbon monoxide detector, with a digital readout to measure the CO in the passenger compartment, but there was zero.

So, I took a second look at the engine and noticed that the rubber elbows on BOTH crankcase breather tubes had rotted away. The elbow on the rear cylinder bank was completely broken and the tube was dangling from the other end where it connects to the throttle body.

The front elbow had 1/4 inch hole on the underside where you wouldn't normally be able to see it.
I replaced both elbows, using old spark plug boots that had a right angle bend and they fit perfectly.

Replacing the PCV breather tube elbows (PCV vent) solved the problem, no more smell.
Both tubes connect the throttle body and are about 12 inches long. The other end, where mine rotted away, connect to the top of the cylinder bank valve covers.
Pic is my version of the fresh air supply to the crankcase.

However: if anything comes out those ports on the valve cover, your PCV is not working right. These are to let clean air from the air cleaner into the engine as the PCV removes exhaust and water etc. If these ell's are leaking, then they just let dirty air into the engine crankcase, that is: if the PCV is working as it should.

-chart-

Last edited by chartmaker; 01-09-2014 at 04:45 PM.
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