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1991 Infiniti G20 failed smog test on the CO & NOx

Tiny
1EYEBLIND
  • MEMBER
  • 1991 INFINITI G20
  • 253,484 MILES
They said the timing is off its at 25 btdc but should be at 15 btdc and they said that might be the problem do you think it could be. Down below is pictures I took of the smog results can u help me on this.
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Friday, August 2nd, 2013 AT 6:40 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Yes, it could cause a problem for you. The timing, however, is set by the computer. Do they feel there is a timing belt issue? Basically, the engine is firing too early.
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Friday, August 2nd, 2013 AT 7:13 PM
Tiny
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They did not say anything about timing belt but do you think being the timing is off could cause it to fail on the co and nox
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Friday, August 2nd, 2013 AT 8:57 PM
Tiny
JACOBANDNICKOLAS
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Yes, I do.
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Saturday, August 3rd, 2013 AT 9:36 PM
Tiny
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  • 23 POSTS
Well I had the timing set by a smog and repair shop and it still did not pass it lowered it some then they wanted to put it on a diagnostic for $90 after they just charged me $70 for timing it and a retest can u help.
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Sunday, August 4th, 2013 AT 12:44 AM
Tiny
JACOBANDNICKOLAS
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Now it comes down to sensors, converter. And will need to be analyzed. I hate to say that, but with today's cars, that is how it is.
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Sunday, August 4th, 2013 AT 10:33 AM
Tiny
1EYEBLIND
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  • 23 POSTS
My girl friend told me that she had put some fuel injector cleaner in the gas tank the same day I took the car in to get smog could that have anything to do with not passing the test.
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Tuesday, August 6th, 2013 AT 9:31 AM
Tiny
JACOBANDNICKOLAS
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I believe it could have something to do with it. Run that tank of fuel out and then have it checked again. You may want to run a couple tanks through it first.
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Tuesday, August 6th, 2013 AT 7:33 PM

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