failed smog. check it out!

[krazy2o9]

ok i went today to smog my 90supra 7mgte and every thing passed exept the emissions test. ive been reading on alot of others post but alot of ppl have differnt things in thers so here is my results and stuff in my car

HC (ppm) CO NO
15mph (max 75 meas 211) (max 0.49 meas 0.39) (max 533 meas 415)
25mph (max 57 meas 119) (max 0.40 meas 0.29) (max 491 meas 337)

i have a devorced downpipe deleting the precat connectiong to the stock cat and exhaust pipes. the downpipe has exhaust wrap on it. i recently took the head off and cleaned everything out, the whole head gasket set was put on it. egr cooler has a messed up gasket replaced it. the egr is cleaned out.
i have the stock injectors and afm with all the stock piping put back in.
the other things ive done to it was relocate the battery to the back and have the fuse box and all thows sensers and stuff in the dash. ill put some pix up soon but ther going to be crapy couse i only got a old iphone to take pix. i timed it like it says in the tsrm with the jumper and all, but it idles at 1000 smothly while cold and when it gets fully warmed up it idles at 850 smothly. have new oil in it but wires and spark plugs havent been changed but look good.

the guy told me it was running a bit rich and could be my o2 sensor. the smog was done in california


i check codes and its all good . the ohm on the o2 sensor pin 2 and 3 is 3.5. spec is 3.0 - 3.6 its close

 

[krazy2o9]

and i forgot to say that i used that g2p stuff. and also wondering if my egr was set up right to

 

[jetjock]

G2P contains polyether amine. Think Chevron Techcron. The only thing it's guaranteed to do is clean the fuel system and even then not much with a single dose. It does a good job cleaning wallets though.

You didn't post the O2 but from the CO it's not rich by much if any. EGR is working. The high HC can be several things but start with the ignition system.

 

[Amstaff]

As said, it can be several things.

Usually its bad oil, bad turbo, bad valveseals etc when HC goes wild.

 

[jetjock]

... have new oil in it but wires and spark plugs havent been changed but look good...

Was going to ask the same but based on that I went with spark...

 

[krazy2o9]

ops my bad co2 is 14.0 at 15mph and 14.4 at 25
o2 is 0.7 at 15 and 0.4 at 25

just did the o2 senser test the way the tsrm says running it to 2500 and the whole jumper thing to the volt meater and it goes up more then 8 times with in 10 sec but i was geting a code of 51 when i was doing that test. but normal code checking it all clear. i can see why 51 one would come up becouse i dont have any heater or ac stuff in, but 51 can also be tps.

so what would be the best to start testing first if ther is many thing i have to test

---------- Post added at 06:54 PM ---------- Previous post was at 06:48 PM ----------

ya my oil is new but i dont realy like how my turbo is its almost done for i think, i put one of thow cheap ebay rebuild kits like 2k miles ago, but thinking the journal walls in the turbo cartridge is a bit to wide couse i still see smoke every time i go wot. valveseals are new

As said, it can be several things.

Usually its bad oil, bad turbo, bad valveseals etc when HC goes wild.

 

[jetjock]

Yea, you're going to get 51 when the TPS is off idle and you need to be off idle to check cross counting. You don't need to be in diag mod though.

O2 is good. So is CO2. Check the ignition and PCV systems but as stated there are other causes of high HC and some are not easy to repair. Your car's model year makes it even tougher because they recently lowered the max allowable for it. If the ignition system checks out a new catalyst may be the easiest solution.

 

[krazy2o9]

sweet, thanks all the info is realy good im start with the pcv and just replace spark plugs and wires

 

[jetjock]

Well, member Amstaff has valid points. If you're burning oil you should fix that. It doesn't take much HC to overwhelm the oxidizing bed on a tired cat. Normally I wouldn't suggest a new one but your engine is running clean enough that if isn't burning too much oil a new cat will pass it. It's not the best solution, just the quickest. Check everything mentioned first though. The real problem is without a gas analyzer you're shooting in the dark...

 

[krazy2o9]

ok ive been testing a bunch of stuff and i have stoped at the charcoal canister, its kinda hard to blow or even put compressed air in the tank port and bearly air comes out the bottom end. was looking around about charcoal canister and seen jetjock u told some one to pm u to perform a desorption on cc was hoping u can tell me. and 1 more thing ive seen that could be the problem of every time i open my gas cap after shutoff you hear that hissins sound of air eather geting sucked in or out not sure, sounds like going in and when i dont open the cap for a long time it makes the sound even louder would that be a bad cc?


and another thing about the cc even after the engine has been shut off even like 1 hour later it makes that gargaling sound

 

[jetjock]

That all sounds normal to me. The canister is unlikely to be the cause of excessive HC unless a fair amount of liquid fuel got into it. In that case desorption involves pumping on it while heated (like what the engine does but stronger), putting the thing in a vacuum oven, or extended purging with heated gas, preferably nitrogen. I seriously doubt that's your problem though.

 

[krazy2o9]

was doing even more things to it right now and on the tsrm maintenance section it said to put 43 psi in port b fuel tank side and plug port a and port c should have air moving freely. but when it hits 17 or 18 psi it makes a clicking sound like some valve shut and the air from port c resistence gots stronger by half. and also when the clicking happens the tank pipe and the compresser that im using pipes come flying off. so at 17 psi click jumps to 40 psi then hissing out the fuel tank side pipe then come flying off

 

[jetjock]

Reading that gave me a headache but if the thing doesn't pass TSRM muster it should be replaced. I still doubt it's behind the HC though. If you want to know for sure and after you're done checking everything get a pre test done with the EVAP system disconnected. Any smog station will do that for you and the DMV won't know.

 

[krazy2o9]

sorry about that.ok ill ask the smog guy. and now found a vsv cable riped off, the one that connectos to the fuel presser regulater. o and had another question i check the o2 connecter on the harnes and light tested it and only pin number 2 lit up, i thought both black wires were 12V heater cables right?

 

[jetjock]

Well yea, both blacks are the heater but one is 12 volts while the oher is ground supplied by the ECU. If both were 12 volts no current would flow and the thing wouldn't work...

 

[krazy2o9]

i belive i found a problem, while changing the spark plugs i took a look inside and seen a nice layer oil siting ther, wasent realy a puddle. all cylinders had the same amount. i took a look in the intake manifold and was clean. this suck realy bad couse i just replaced the valve steams like 2 weeks ago.
is this normal when replacing valve steams. maybe it would go away after a bit. i used engine moly assembaly lub when puting every thing back.???

 

[krazy2o9]

smog round #2 failed. i did a pre test , not the uphill sim ca test. and my hc pass for the 25mph but faild on the 15mph just by a bit.
here is what i got for the acutal test.
15mph (%co2 14.3) (%02 0.6) ( hc max 75 meas 186) (co% max .49 meas .35) (NO, max 533 meas 424)
25mph (%co2 14.7 (%02 0.3) (hc max 57 meas 76) ( co% max .40 meas .18)(NO, max 491 meas 283)

he had to redo the test becouse his timing device got stuck on my throttle and red line so he restarted it.
i also added a bottle of rubbing alcohol 99% on empty tank, filled with gas after test., just to see if it help.

ok on the car i tryed a differnt o2 off a tacoma its almost brand new but it was a 4 wire set up so just grounded the white wire then tested it again in car and was geting more then 8 pulses in 10 sec. vsv for the fuel regulater was riped, so fixed that, got some new spark plugs, i dident change the wires couse ther msd cables and were still all in spec, but using stock coils.

i also cleaned up the oil on top of the piston before i went,

i dident realy want to do this couse im straped on cash right now but ill be geting a cat. what do u guys think should i just get a cat or a precat and cat. ill be posting a wtb soon for one

 

[3p141592654]

If you have the stock downpipe, put it back on for the test, it will cut your HCs down a lot.

 

[krazy2o9]

its going back on for next test. i bought new precat and cat, now got to wait till thay come. hope it works

 

[Nick M]

I can not verify how much the precat affects emissions. Our state isn't testing OBD I anymore. But I can tell you the myth about cold starts is just that. Being close to the head it will warm quicker and help, but it is to reduce all three during driving.