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kelk44
New User
Aug 1, 2007, 10:35 AM
Post #1 of 2
(1396 views)
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My volvo failed NOx reading.Allowed 848 and read 1107-50/15 test allowed 937 and read 1188.Do I need to replace EGR valve? They said getting to much heat..... Please help!!!!!!!
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 1, 2007, 12:03 PM
Post #2 of 2
(1391 views)
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Re: volvo failed NOx
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New EGR may fix it but hard to be sure. Spray some carb cleaner at it at idle and see if it changes the idle speed. Go easy with that test as the cleaner can flash on hot parts.
General tune-up stuff helps too. Go in with a cooler engine and don't run your A/C on the way as heat is a major cause of high NOx. It's odd but the EGR puts a small amount of exhaust gas into incoming air/fuel and that cools the combustion temp.
Is the car running well in general? Little problems can really set off emissions. How old is the car? Does it have any codes stored or CEL on or on momentarily lately?
T
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