smog gurus
02-29-08, 02:37 AM
#1
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smog gurus
any help with what i need to do to get this to pass? this is a 1985 rx7 gs all stock as far as parts go. just need advice on how to get it to pass based on the smog sheet readout. do i need a cat? do i need to get the carb looked at, if so how and where? Thanks in advance for any help you may be able to provide.
02-29-08, 02:44 AM
#2
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Hum how much higher than needed? It's hard to read the printout.
Damn Hybrid.. argh... Wait till all those hybroods leak acid & chems from it's massive battery racks on the precious polar bears as the rott in salvage yards.
Buy a tiny peace of land in West Texas and register it here. Next year it will be exempt.
The cats are mucho expensive for stock replacement...
Damn Hybrid.. argh... Wait till all those hybroods leak acid & chems from it's massive battery racks on the precious polar bears as the rott in salvage yards.
Buy a tiny peace of land in West Texas and register it here. Next year it will be exempt.
The cats are mucho expensive for stock replacement...
02-29-08, 02:31 PM
#3
rotarysurgeonextraordinar
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loks like your cat is not functioning at all you can get reasonably priced replacement universals that while I would not recommend for continued use on a rotary will serve its purpose for the time being. Also try running sea foam through your carburetor and in your gas tank as well. Make sure both your leading and trailing ignitions are firing and makes sure she's good and warm before you go for the test. I don't know about your area but some cities do not require a smog pump anymore but I highly recommend it for the tes. It drastically reduced my emissions when i went for a test. If you do all these things you should pass with flying colors I got mine which was almost triple the legal limit to pass with no problem. But the catalytic converter would be the first and most important step. If you wish to get a proper replacement consider the high flow one from racing beat thats what I used and it was actually cheaper than most stock replacements I found plus its healthier for the engine. Let me know if you need anything else
02-29-08, 03:37 PM
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Yea maybe an envelope will fall out with 40 bucks in it or a cold 12 pack of Coronoa maybe a pint of Jack Daniels. Got to find the right shop bout 3 minutes before closing...
Not that I have done that before.
Not that I have done that before.
02-29-08, 05:58 PM
#5
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O2 is 0.0. HC is 580 ish. Tells me you are not getting air into the system. Before replacing the cat, make sure your ACV and air pump are working properly.
If the cat was not working, HC would be in the 1200+ range.
Look at the air system first. Much less expensive than replacing cat.
Cat could still be bad, however.
RXDad
If the cat was not working, HC would be in the 1200+ range.
Look at the air system first. Much less expensive than replacing cat.
Cat could still be bad, however.
RXDad
02-29-08, 09:21 PM
#6
FB+FC=F-ME
I agree.
A rotary with a dead cat can put out several times that amount of HC.The cat is working,its getting it down to that level,but it needs help.
Your very high CO also points towards a rich mix.Make sure to check the airfilter,the whole igntion system(VERY important on a rotary) and the carb for any problems.
Its hard to see the NOX numbers,but they appear to be quite low.Rotaries naturally have low NOX numbers,but they can be artificially lower than usual when the mix is rich.The trick is to lower HC's to below the limit without raising NOX above the limit........all the while watching the CO as it approaches as close to zero as possible.Thats the sign of a well tned engine with correctly functioning smog devices.Its a balancing act,and all three gas production amounts, affect the other's.
A rotary with a dead cat can put out several times that amount of HC.The cat is working,its getting it down to that level,but it needs help.
Your very high CO also points towards a rich mix.Make sure to check the airfilter,the whole igntion system(VERY important on a rotary) and the carb for any problems.
Its hard to see the NOX numbers,but they appear to be quite low.Rotaries naturally have low NOX numbers,but they can be artificially lower than usual when the mix is rich.The trick is to lower HC's to below the limit without raising NOX above the limit........all the while watching the CO as it approaches as close to zero as possible.Thats the sign of a well tned engine with correctly functioning smog devices.Its a balancing act,and all three gas production amounts, affect the other's.
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