Failed Smog...Chart posted

[TimTurboZ]

So I have new plugs, wires, air filter, and fuel filter, I got a Cat from my friend that had only a couple 100 miles on it. Issue is I did a KA24DE swap into my 90' Coupe. Visually I fooled them I had to retard my timing tho so it would be within the range of the SOHC timing. Single Cam is 15 degrees, timing can be +/-3 for smog. Stock timing for a Dual Cam is 20 degrees. So I set my timing @ 17 degrees. Only other thing is I never swapped my o2 sensor or my Distributor cap. I also haven't checked for ECU codes but I don't see that that will really tell me.

Heres my massive FAIL



I read unburned fuel and a bad o2 sensor can be an issue with High HC and CO readings. I also used 91 octane in my tank. I read High octane and retarded timing can cause high CO levels....any help on the subject NICO???

Thanks Tim

[goldfish]

Why exactly are you trying to hide the fact you did a DOHC swap?Engine's from a newer 240sx are legal swaps, even in california... :pSet the timing correctly and make everything as it should be and correctly to use a DOHC engine, you'll probably pass smog =D

[TimTurboZ]

I'd have to pay and get my car reffed and Bar'd. There are unused wires from the SOHC interior harness when you do a DE swap. These are diagnostic wires so safe to say I cant legally do the swap when those are left out. Plus I don;t wanna pay to get it legal. The smog guy didn't notice anything he just went off the stock SOHC timing. Hence my problem.

[TimTurboZ]

Ok checked ECU got good old code 55 no issues.

[Didderson]

Why not correct your timing? You might want to reset the ecu and run 93 octane for the check.Clean that MAF sensor and make sure your grounds and maf wiring are solid.

Idk what else to say but KA's are dirty whore motors even when they run right. Imo my sr with a straight pipe smells the same as my friend w a stock KAE

I think it's offensive that they not only fail you, but LABEL you as a gross polluter as if its a felony crime or something. Man CA, give your residents a break.

[TimTurboZ]

Why not correct your timing? You might want to reset the ecu and run 93 octane for the check.Clean that MAF sensor and make sure your grounds and maf wiring are solid.

Idk what else to say but KA's are dirty whore motors even when they run right. Imo my sr with a straight pipe smells the same as my friend w a stock KAE

I think it's offensive that they not only fail you, but LABEL you as a gross polluter as if its a felony crime or something. Man CA, give your residents a break.

I don't see what I'm failing to explain here. When they put my Vin in the computer it comes up as the emissions for the KA24E it also tells the Smog Tech that the timing is suppose to be 15 degrees. I can have a +3 or -3 then stock timing. KA24DE timing is 20degrees. Hence I cant have it 5 degrees advanced for the test because I'll fail for that.

Also theses no 93octane in California (unless your at a raceway) 91 is the highest and since I'm retarding my timing higher octane technically should be hurting my emissions because is burns slower therefore having a chance of not burning completely which is what I've read can cause High HC and CO emissions....

I got a new o2 sensor, and am going to refill my tank with 87 in a couple days. Possibly seafoam it aswell. Any other suggestions or ideas???

[Didderson]

Your ecu is smart enough to recognize the slower burning gas is present so it uses less gasoline per explosion. Thus why mostly everyone sees improvements in gas milage when using premium gas. My bad I didn't know you guys had lower premium octanes.

Seafoam is a great product, go for it!

Your retarded timing is probably the fault of your failing. It's too bad they check for that because its not being combusted under optimum internal pressure.

[Wc240]

honestly, your best bet is to do a clean swap. tuck wires, make it look good and ref it. try runnin 87 and test it again. 01 burns slower but its taking too long and its throwin unburned fuel out the pipe. the seafoam is a great product but it wont help your hc and co content.

[TimTurboZ]

I'll look into the ref. I wish I could tell the smog tech it's a swapped motor and go off the correct timing so I didn't have to retard it. But if he can't do that then I'll just fail for that. I know a guy who smogs and would probably let me have my timing straight and just put down a different timing in the computer since it's not that big of a deal to change that little fact. Thing is hegot busted for doing friendly smogs a whileback so he may not. Also I'm not sure if he has a test only shop and now that I have that gross polluter slapped on my car test only is my only option (don't know if it was b4 I am trying to get it put in my name right now)

I'm going to get a new distributor cap, and try the seafoam (clean up my valves I'm sure it could help me out a bit) Possibly a new cat (one I got was sitting on my friends back porch for almost a year and may bea lil sall for my car)

Ugh

[Wc240]

that always sucks about the dross polluter tag. but thats ok. find some place thatll do a free retest. there plenty of em around and it is very helpful. i stck to my previous about 87 tho. thatll get you a good baseline to run from. have you tested your 02 sensor?

[TimTurboZ]

The place I went to retests for free. I just don't want to go in there and fail again and have to pay another $50. I'll talk to my friend today his shop is don't pass don't pay! There has to ba a catch to those places tho they can't afford to just keep testing cars that won't ever pass.

I'm going to do 87 for sure. I'll get a digital Timing light instead of my old school stobe light one and set my timing dad on 18 so its as close to my 20BTDC as possible. I'll talk with the smog tech @ my work today aswell (we don't do test only)

Thx for your input