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87 260E failed smog...Input?
Any thoughts on what direction I should take?
All the moron said at the test center was I needed a new engine :rolleyes: http://www.ps2cho.net/downloads/phot...E/smogtest.jpg My compression is 185psi across the board. |
Looks like the fuel system is out of adjustment...the O2 sensor/lambda....
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What about thoughts on the cat? So start by checking fuel pressure and testing voltage on the O2 sensor? |
How many miles on the car?
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Was the Lambda fixed at 50% or was it oscillating around that value?
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I'd put my bets on an O2 sensor problem if the Lambda is adjusted correctly.
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Would a faulty O2 sensor alone really cause a GP?
It was oscillating, but around 50% at idle. |
heres a cheat for you, if your car has an air pump. do a quick wiring job to make the air pump run while going through inspection. It will pump air into the exhaust giving you 0 emissions.
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I hope what u say is true, because mines failed miserably too. My 90 300 se does have an airpump, to wire her on while going thru smog test is no big deal. It will cost me $23 to test, but is worth to validate your hypothesis. The extra air will burn off the extra hydro-carbon, reduce the CO. I have already unplugged the air valve, it did improved the idle test. Before anything was done, the car failed in just about all count. And the exhaust really stinks with too rich gas. Some guy offer me a used working O2 sensor for $40. I haven't had time to pursue it yet. I live in Vancouver BC we have www.aircare.ca the good news is they will rendered emission test to become History in 3-4 yrs, as newer cars are so clean, so we'll be receiving our Get out of Jail free card soon, but not soon enuf. i wanna my cake & eat it NOW.:mad: I hope I can give u good news very soon. I have tried stud tires as a chap told me, with stud tires it wont be allowed on the dyno drum. But no serie Bob they did the test as if nothing had happened, or the poor testing employee had been rendered redundant already. I do start to feel like I am WIley Coyote or Wicked weasel always try to beat the system at every instance. pray I get thru. God help all of us. |
No airpump on a 87..
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Is it harder for the pre-'90 cars to pass smog since they don't have EGR or an air pump? Seems like that would be the case.....
MI rocks, no smog tests here! :D |
NOx forms when cylinder temps reaches 2500F and higher which indicates a lean condition. A lean mixture will produce oxides of nitrogen since carbon monoxide and hyrdocarbons are down.
I would have the lamda adjusted and the oxygen sensor tested out. Then I would make sure the fuel delievery system is delivering a good amount of fuel. |
I was at an auto parts store and chuckled but was curious when I saw not one but two different additives claiming to "guarantee" smog pass... :rolleyes:
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Is it true that if you fail the smog test twice as a gross polluter they have to confiscate the car in california?
Should have my ignition wires and idle air hoses tomorrow so will put those on and see how it goes. Once that is done I'll start testing the O2 and Lambda. Wanna make sure I don't have a huge vacuum leak with these rock hard hoses. |
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