First a little history - about 5 years ago, the experts on this website helped guide me to bring my 2000 Si from stock to "built". I have since put on a good 75,000 miles on this motor with CTR cams and pistons using 91 octane. After a lot of tinkering, the only bolt-ons remaining are the AEM intake, DC 4:1 which is piped at 2.5" all the way back. I reverted to the factory IM and injectors but still run a p28 ECU.

This one perplexes me. My wife's car is stuttering when she upshifts and the ECU is throwing a CEL. I counted code 92. Or maybe it is code 9 and code 2. however, code 2 for obd1 is listed as the secondary o2 sensor which I do not have and haven't had in the last 5 years that we have been running this setup. Either way it does not make sense.

I checked my Haynes manual and since I run an obd1 computer, I checked the OBD1 code list first, which only goes up to 48. I checked the sticky thread on this website about all codes which goes up to 74 (here: https://honda-tech.com/forums/showth...ight=code+evap). I also searched EVAP and code 92 and found very few relative results.

In the Hayne's manual, under the obd2 codes, code 92 is listed in parenthesis under P0441: EVAP system insufficient purge flow. I checked the vacuum lines and they seem ok.

I'm not sure what to do next - I don't want to just start buying parts until I troubleshoot completely but I can't do that until tomorrow. Any thoughts? Has anyone seen this problem before? Thank you.

 

I have been driving the car all day and it seems to be getting worse. Now it seems that when I release the clutch to engage first gear the car bucks and almost feels like the motor will stall but if I depress the clutch and try again it smooths out enough to go slow...but if I try to go faster it starts bucking again. I see a leak at the valve cover so I will replace the gaskets after work. I also got a can of starter fluid to check for vacuum leaks. If that doesn't solve it I will troubleshoot the purge solenoid.

Still looking for any experience or advice. Thanks!

 

I sprayed the vacuum lines and IM gasket and valve cover gasket with starter fluid while it was idling and the motor did not react. I just finished installing my boss' new printer so no I'm headed back to the shop to swap the valve cover gaskets.

 

I swapped the valve cover gasket set and there was oil on 2 of the spark plug wires. I'll change those today. The CEL came back after a couple minutes of driving. Oh yeah, I took wires from the battery and hooked them up to the purge control solenoid and it does make a clicking noise. What should I check next? Perhaps the canister vent shut valve?

Thanks

Edit - even with this CEL, VTEC still engages.

 

update. yesterday I used quite a few paper towels to remove the oil pooled up in the spark plug holes before swapping plugs and wires. I also cleaned the air filter.

Then I removed the purge control solenoid and was able to verify that it opens when given 12 volts. With no power it is closed and with power I can blow air through the tubes. I also sent power to the vent/valve thing on the canister assembly and that thing definitely engages when connected. I did not remove it to verify whether or not it is gummed up.

I also removed my "catch can" which was pretty full of oil. It's really just a little check valve for an air compressor but it took years to fill that thing up. It is no longer connected.

The car runs GREAT now but it is still throwing a CEL (code 92). I drove the car about 50 miles and it runs as great as ever. I just checked and the spark plugs are dry so the valve cover gaskets are doing their job.

I have a year and a half before I have to pass emmissions again so I'm not too worried about it yet, but it still bugs me to know that something isn't right.

This car has 250,000 miles on it....how long do the charcoal canisters usually last? How can I test the canister itself?

 

You don't really have to use the charcoal canister. Only if you want to pass emission tests. If the car throwing a CEL then you have inspect it, if not sure what the cel is then take it to shop and let them check what cel problem is..