93 FD won't pass California SMOG
#28
Cheap Bastard
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Got that additive from Kragen that is supposed to make you pass, replaced plugs and ran it on the freeway and kept it in high RPMs all the way the to the smog shop and didn't shut the car off. It was nice and hot and it still failed. So far I am looking at replacing the main pulley and switching in a stock computer and a couple gallons of high octane race fuel.
#36
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#37
OK, let's go at this a different way. Replace the ECU with an Apexi PFC, then you can tune your fuel at idle to lean it out enough to pass the smog test and your left with a much better ecu to boot! Plus you avoid the cost and labor of all the other stuff you mention. . .(no guarantee, but seems like your car is close to passing, just too rich at idle!)
--Jeff
--Jeff
#39
rotor rotor pow.
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are you running the car hard before you smog. i usually drive the car around for at least 15 min to heat everything up and then idle it while i wait for the tech to be ready. fd always passed this way. same thing worked on a old volvo i smogged, it failed BAD then i ran it hard took it back next week and it passed w/o a problem.
#40
Eats, Sleeps, Dreams Rotary
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The M2 ECU is essentially equivalent to the stock ECU at idle AFIK and there is absolutely no reason that a properly running FD with a stock cat should fail at idle (assuming new plugs (stock 7s and 9s), wires, oil and filter change). I'm still betting on a faulty O2 sensor; failing that, leaky injectors or a bad cat.
#42
Speed Mach Go Go Go
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These are realistic proven choices:
* OEM cat used for testing (buy or borrow new is $1k).
* retard timing to legal limit (works every time on my old CRX)
* Denatured alcohol lowers HC but raises NOx (you have to figure out the ratio - last resort).
* Sea Foam (deep creep) in the intake via vacuum. this is your best and cheapest solution. The only problem is it will smoke so bad the neighbors will call the fire dept, so do when no one is home or find an empty parking lot somewhere.
* OEM cat used for testing (buy or borrow new is $1k).
* retard timing to legal limit (works every time on my old CRX)
* Denatured alcohol lowers HC but raises NOx (you have to figure out the ratio - last resort).
* Sea Foam (deep creep) in the intake via vacuum. this is your best and cheapest solution. The only problem is it will smoke so bad the neighbors will call the fire dept, so do when no one is home or find an empty parking lot somewhere.
Last edited by GoRacer; 03-18-08 at 07:36 PM.
#44
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I don't think it's the o2 sensor because it's passing great at 2500. I did a computer diagnostic check and the computer output codes for the knock sensor and the egr switch. Any input?
#46
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Turns out the pulley fixed it. With the Pettit pulley I was getting over 250 HCs at idle, I switched it out with the stock pulley and set the idle to 1000 and the HCs are nearly zero now. Thanks everyone
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