egr valve
#2
#3
#4
Check your VIN here to see if your car was equipted with EGR when it left the factory: https://customers.volvocars.com/owne...C/vin1996.html
#5
#7
The 96 850 non turbo engines didn't have an egr valve; they only had a valve that allowed an electric air pump to pump fresh air into the exhaust. I thought it was weird myself until I did some research... The fresh air helps the catalytic converter burn excess fuel and carbon more thoroughly. Finicky system sometimes but great when it works!
#8
#9
#10
The other thing that would be helpful to know is what part of the test you failed.
Nitrogen oxide (NOx)
Hydrocarbon (HC)
Carbon monoxide (CO)
“Curb Idle” test. The idle portion of the test measuring HC and CO
I can't find the values so if you have the the upper limits allowed that would be helpful along with what your vehicle actually was pumping out.
Nitrogen oxide (NOx)
Hydrocarbon (HC)
Carbon monoxide (CO)
“Curb Idle” test. The idle portion of the test measuring HC and CO
I can't find the values so if you have the the upper limits allowed that would be helpful along with what your vehicle actually was pumping out.
#14
A lean engine operating condition produces more NOx than usual, and the lean exhaust chemically interferes with the converter's ability to clean NOx. Excess oxygen is good for cleaning HC and CO, but bad for NOx.
Misfire condition
Failed or failing oxygen sensor
Coolant sensor reporting higher temp than actual
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber (Might try some seafoam)
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Poor fuel quality (try a can of octane boost)
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections
After those simple things, you may be looking at needing a new catalyst.
No check engine light?
Misfire condition
Failed or failing oxygen sensor
Coolant sensor reporting higher temp than actual
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber (Might try some seafoam)
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Poor fuel quality (try a can of octane boost)
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections
After those simple things, you may be looking at needing a new catalyst.
No check engine light?
#18
Thread
Thread Starter
Forum
Replies
Last Post
Qamar
Volvo 240, 740 & 940
5
09-08-2005 08:24 PM