New purchase, failed smog
#1
New purchase, failed smog
1st post here. Recently purchased a 1996 2.5 TL. Car is in great shape for having 228,000 miles. Engine was replaced about 40,000 miles ago.
Took it in for smog testing, said the O2 sensors weren't ready. Went ahead with the test, failed on the NO levels. This is caused by a lean condition and the EGR not working correctly.
Pulled the EGR and it has minimal buildup. The tube doesn't have any noticeable buildup without pulling the intake to see what is happening at the block.
I can't find any info on cleaning the 2.5 EGR system. All the threads I see are for the 3.2.
Should I replace both O2 sensors and clean the EGR and try again?
Thanks for any input.
Took it in for smog testing, said the O2 sensors weren't ready. Went ahead with the test, failed on the NO levels. This is caused by a lean condition and the EGR not working correctly.
Pulled the EGR and it has minimal buildup. The tube doesn't have any noticeable buildup without pulling the intake to see what is happening at the block.
I can't find any info on cleaning the 2.5 EGR system. All the threads I see are for the 3.2.
Should I replace both O2 sensors and clean the EGR and try again?
Thanks for any input.
#3
I would do the same.
I do recommend DENSO as they are what are put on at the factory. I got mine off AMAZON. AMAZON is a bit cheaper and has free shipping, but Rockauto also has them.
Front was fairly easy, if a bit awkward to replace (took out battery, and shield). Rear had to drop the front pipe if I recall correctly.
Amazon:
DENSO Part # 2344726 {#36531P1RA01, 36531P1RA02} OE Style One of our most popular parts
Upstream; DENSO is the O.E. Manufacturer / Oxygen Sensor
Part Image
$60.79
DENSO Part # 2344097 {Click Info Link for Alternate/OEM Part Numbers} OE Style One of our most popular parts
Downstream; DENSO is the O.E. Manufacturer / Oxygen Sensor
Part Image
$79.79
I do recommend DENSO as they are what are put on at the factory. I got mine off AMAZON. AMAZON is a bit cheaper and has free shipping, but Rockauto also has them.
Front was fairly easy, if a bit awkward to replace (took out battery, and shield). Rear had to drop the front pipe if I recall correctly.
Amazon:
DENSO Part # 2344726 {#36531P1RA01, 36531P1RA02} OE Style One of our most popular parts
Upstream; DENSO is the O.E. Manufacturer / Oxygen Sensor
Part Image
$60.79
DENSO Part # 2344097 {Click Info Link for Alternate/OEM Part Numbers} OE Style One of our most popular parts
Downstream; DENSO is the O.E. Manufacturer / Oxygen Sensor
Part Image
$79.79
#4
Thanks adventurecrv. I ordered them from RockAuto. $145 shipped. Got the Denso's. Front one was easy, the rear was a little tougher. I did have to drop the front pipe, which was kind of a pain and dirty, lol.
The EGR is working, it does have vacuum and operates when you rev the engine.
The code reader did say the O2 sensors weren't ready when I had it tested, so time to do the drive cycle and see if it's fixed. It is a very clean car and I think it was a bargain for $800. Time will tell
The EGR is working, it does have vacuum and operates when you rev the engine.
The code reader did say the O2 sensors weren't ready when I had it tested, so time to do the drive cycle and see if it's fixed. It is a very clean car and I think it was a bargain for $800. Time will tell
#7
I talked with my mechanic and he says the cats are good, they are passing the tests. Right now I am just waiting on the O2 sensors to be ready. All the other systems are good. Just need to drive it and either get a system code or reset the computer if it doesn't clear.
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#9
No luck with the new O2 sensors. Still failed NOX. 1979 at 15 mph (max 430) and 1446 at 25 mph (max 717)
Did the lamba efficiency calculation and says the cats are at 79%. Hate to replace them. Especially the front one, very expensive.
Back to the drawing board....
Did the lamba efficiency calculation and says the cats are at 79%. Hate to replace them. Especially the front one, very expensive.
Back to the drawing board....
#10
Ok, so I am learning and not paying attention. I looked at the EGR valve, but not that plate on top of the intake. Of course it was completely gummed up. At least I know the O2 sensors helped. Should pass easily now. Thanks for the feedback. Asking questions on here helps me work thru it.
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rp_guy
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07-16-2017 07:33 AM