Keto
New Member
- Joined
- Apr 28, 2014
- Messages
- 25
- Reaction score
- 0
- Points
- 1
- Vehicle Year
- 1996
- Make / Model
- Mazda
Failing Smog - Suggestions? - FIXED!
I have a '96 3.0, 107K miles, failing CA smog, just barely. Passes 25mph test with flying colors, fails the 15mph in only 1 category. Everything is good except HC is just a pinch over max. So close its stupid. Tried the CRC stuff (didnt work), tried ISO Heet trick too, cant get it down.
Full tune-up not too long again, plugs, wires, coolant flush/replace, oil change, air cleaner, etc. Throws no codes at all.
I've done the following things:
* New EGR valve, cleaned out the pipes/tube too.
* Replaced all the o2 sensors with new Bosch units, reset the ECM too
* Checked all the vacuum lines, replaced a couple ratty ones.
* Looked for misc vacuum leaks
I have new exhaust manifolds on the way, I *think* one has a small leak and they look like hell (rusted, etc). Gonna pull off the exhaust and reseat/seal everything on the y-pipe, etc. That may be what the problem is.
Putting that aside for the moment....
Anyone have any suggestions on other things to look at specifically?
Thanks
I have a '96 3.0, 107K miles, failing CA smog, just barely. Passes 25mph test with flying colors, fails the 15mph in only 1 category. Everything is good except HC is just a pinch over max. So close its stupid. Tried the CRC stuff (didnt work), tried ISO Heet trick too, cant get it down.
Full tune-up not too long again, plugs, wires, coolant flush/replace, oil change, air cleaner, etc. Throws no codes at all.
I've done the following things:
* New EGR valve, cleaned out the pipes/tube too.
* Replaced all the o2 sensors with new Bosch units, reset the ECM too
* Checked all the vacuum lines, replaced a couple ratty ones.
* Looked for misc vacuum leaks
I have new exhaust manifolds on the way, I *think* one has a small leak and they look like hell (rusted, etc). Gonna pull off the exhaust and reseat/seal everything on the y-pipe, etc. That may be what the problem is.
Putting that aside for the moment....
Anyone have any suggestions on other things to look at specifically?
Thanks
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