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I have a 1991 S-10 Blazer that failed emissions.

Tiny
HAFTALUVNASCAR
  • MEMBER
  • 1991 CHEVROLET BLAZER
  • 25,000 MILES
After a diagnostic was run, a major tune-up, oil change and new cat converter were done. Failed again on retest. HC and CO levels are way high. After the retest, minimal changes were seen in the emissions. What do I look at next?
Sunday, May 20th, 2012 AT 7:12 PM

11 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What about the o2 sensor? That is a very important for the hc and co.

Is the motor working on all 6 cylinders?

Roy
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Sunday, May 20th, 2012 AT 7:16 PM
Tiny
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I was told the o2 sensor tested ok. As far as I can tell motor working on all 6. What would I be noticing if it wasn't?
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Sunday, May 20th, 2012 AT 7:21 PM
Tiny
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How did they determine the o2 was good? What were the crosscounts?

Roy
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Sunday, May 20th, 2012 AT 7:24 PM
Tiny
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  • 6 POSTS
I don't know. The place that ran the test said that everything was ok except the cat.
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Sunday, May 20th, 2012 AT 7:45 PM
Tiny
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Cat only controls the NOX. I think you need another shop with more expierence.

Roy
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Sunday, May 20th, 2012 AT 8:31 PM
Tiny
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  • 6 POSTS
Are the o2 sensors hard to change
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Sunday, May 20th, 2012 AT 8:41 PM
Tiny
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Nope, easy on this model. It is on the exhaust manifold. You need a 7/8 wrench to remove it.

Roy
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Sunday, May 20th, 2012 AT 8:46 PM
Tiny
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  • 6 POSTS
One last question before I stop driving you crazy. The blazer has been getting progressively harder to start. Sometimes have to turn the key 15 - 20 times to get it to turn over. Starter was replaced. Can you give me an idea where to start trying to correct this?
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Sunday, May 20th, 2012 AT 8:56 PM
Tiny
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First, does it crank? If it does, then I would be looking at fuel pressure.

Roy
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Monday, May 21st, 2012 AT 12:00 AM
Tiny
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  • MEMBER
  • 6 POSTS
I will look into that. You have been very helpful. I will be back I am sure. Have a great weekend.
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Monday, May 21st, 2012 AT 12:18 AM
Tiny
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Thanks, you too

Roy
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Monday, May 21st, 2012 AT 12:26 AM

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