bent240lv

I just finished doing some work on my truck 90 4x4 22re and now i cant pass smog. I replaced the fulll exhaust system ( header - 02 - cat - muffler), took off and cleaned intake manifold and throtle body and installed new wires, plugs, cap and rotor. The guy who did the test siad i have to much un-burned and to much over-burned fuel, so i'm lost. The truck runs fine except i did notice that under very light idle maybe 1000-2000 rpm it will start to lope. But, if i go past that it does not lope at all. I also cleaned AFM and filter is clean too.

Im going to try and test the TPS and make sure it is working and adjusted propery. Other that that what else should I try?

I also dont know the past history of the truck, it has passed a smog check prior to me owning it though.

Thanks

leebee

i can understand the unburned fuel, but over burned?? once fuel is burned, thats it, gone. didnt know you could burn something more once its gone.
go figure.

me thinks the smog tech must be 'tui', testing under the influence.

lee

ps

had a thought related to what mma alex mentioned, check your egr valve. if it is malfunctioning that will cause a fail.

lee

MMA_Alex

Do you live in a state that requires them to do free retests until you pass? They should give you a number for hydrocarbons, NOx, and CO. Depending on which one of these is off will tell you what to look at to solve your problem.

Incomplete combustion would mean your hydrocarbons are too high.

I'm not sure how you can have too much fuel burning/ not enough burning at the same time, unless maybe one of your injectors is really bad?

see if you can figure out which of the other numbers was too high.

stock87

What brand of O2 sensor did you put in? Bosch? If so, get rid of it and get a Denso (OEM) or NGK in there. http://www.sparkplugs.com has the best prices. The Bosch is too short to heat up properly and get a good reading.

If that isn't the problem, where is the O2 sensor bung on the headers? I've heard of problems arising if the bung is on a single cylinder pipe instead of further down at the collector.

Easy way to check the TPS is to put a wire across terminals TE and E1 in the check connector while idling. This should drop the idle into timing setting mode. If there is no change, the TPS isn't adjusted correctly or is broken. With the terminals shorted, timing should be 5 degrees. Also idle speed should be set around 800.

The other thing I would suggest is giving it a good valve adjustment or getting one done. Over time the valves tighten up and may not allow complete combustion at idle due to compressional loss.

Those are some things to look at to start anyway, hope that helps.

bent240lv

Yeah I sure do have a Bosch, it was the OE type from autozone. I wish I thought about sparkplugs.com, I paid $90 for the bosch. I did replace to PCV Valve as well but I have not had the valves or the timing cheked yet.

The 02 sensor is locate before the cat just before the flange tha connects the cat and the end of the downpipe.

Here are the readings from the test:
HC PPM @ 2500RPM limit = 220 - Reading = 727
CO% @ 2500RPM Limit = 1.20 - Reading = 11.94
CO2 @ 2500 RPM = 18.90

I have not tested the TPS yet with the jumper wire. The Idle RPM reading on my test shows 1136RPM, It does not sound that high at idle.


Thanks for the help, now I need to figure out what to tell autozone so I can return my 02 sensor and purchase one from sparkplugs.com.

TNRabbit

Bosch sensors are a notoriously bad fit with Japanese engines. If that's not the problem, my second guess would be a bad injector.

stock87

Yep, there's your problem. Get that Bosch out of there, adjust the valves, and bump down the idle a shade and I bet a six pack you'll pass just fine.

thook

It's AutoZone...just tell them it was faulty. No big deal. They won't check it. Atleast 'round here, they don't care. In the event they only want to give you store credit, see if they can order the NGK or Denso. BTW, what brand of plugs did you go with?

Also, if it were an injector wouldn't there be some missing?

About how much time/miles would you say? I've wondered about mine.
(Sorry for the slight hijack)

bent240lv

I will give it a try, i also forgot to mention my injectors are fine. I know becuase I sent them to witchhuneter while I was waiting for my headers to arrive.

MMA_Alex

manual says 12k between adjustments. Its easy enough to do after you've done it once that you can do it in under an hour (takes me just over a half hour) assuming the engine is already warmed up.

high CO, and HC means its running rich. Probably the 02, but could also be from something else. These engines like their sparkplugs, and 02 sensors to be Denso, or NGK.

I agree with stock87 that its probably worth looking at the TPS which could be out of adjustment, and could be contributing to the running rich.

When all the emissions systems are running properly the 22re should have no issues passing an emissions test.

motoriderbc

Can you check the output voltage from the o2? It should be pegged at 1.0v with that huge amount of CO. Your CO2 reading of 18.9% is impossibly high, should be closer to 8-9% with your engine running that poorly. A perfect running engine with a perfectly fired up cat will be around 15% CO2. Just wondering if thats a mis-type.

bent240lv

I dont have a multi meter to check anything. I was thinking about investing in one, they seem cheap enough. I dont have many tools besides the basics, so to check the timing and all is impossible for me. I was going to see if there is anyone on the forums in las vegas that has these tools and see if the would help me but i have not asked yet. I have NGK plugs Iradium plugs in it and i just puchased the denso 02 and NGK wires. I will update later and thanks again

bent240lv

NO mis-type unless the testing equipment was not working properly.

MMA_Alex

you can still check to see if the tps is in the ballpark by shorting the terminals stated above with a paperclip, and seeing is the idle drops. If it drops while shorted its either close, or dead on.

Flash319

Check your TPS. If it does not close Idle switch then you will run rich at idle.