Question about 1991 Chevrolet S-10

1 Answer

95 chevy s10 wont pass etest,, nox too high

2.2 engine,, no reading high

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 17,970 Answers

Scanned the ECU and confirm us what fault code is stored there; sound like a sensor need to be replaced.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Feb 24, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 69 Answers

SOURCE: scanner for a chevy 95 S10

Was it made in Canada? Late model 95 right? Its a OBDII, check the manufacture dates on the inside of the drivers door it will tell you.

Posted on Aug 17, 2009

leetamara
  • 702 Answers

SOURCE: my chevy s10 failed emissions

Have your cat. converter checked out. I just had one of these for the same reason in my shop today.

Posted on Jul 09, 2008

justuscc
  • 360 Answers

SOURCE: CHEVY SUBURBAN FAILED SMOG BECAUSE OF HIGH NOX VALUES.

nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Posted on Oct 24, 2008

SOURCE: 1991 chevy s10 pickup 4.3 engine

Check for vac. leaks and timing.

Posted on Jul 13, 2008

  • 226 Answers

SOURCE: replacing the o rings on a 95 chevy s10 2.2

You have to take the upper Plenum off. There are hard plastic lines there that are common failure items. They get brittle and crack, they also can leak fuel into you oil. Its commonly known as the spider assy. It can only be bought as an assy. It is a fairly envolved job. Difficulty level 4 of 5.

Posted on Oct 04, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

95 chevy astro van won't pass high emissions nox at low speed


If its higher mileage check the EGR valve. Famous for being clogged on those engines. Assuming it has emission friendly exhaust.

Nov 04, 2013 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Fail smog test


fist i would like you to post the year make and model of the truck along with the HC ppms and NOX ppm it would be very helpful but high hc and nox can be attributed to a faulty EGR system nox is produced when the combustion chamber temperature gets too high so a small amount of exhaust is cycled back into the air stream to help cool them there are other causes but without looking at the levels its much harder to say

Dec 06, 2012 | Cars & Trucks

1 Answer

I have a 95 grand jeep cherokee and i have failed 2 emission they say it is a the NOx is to high what would cause that?


What causes High NOX Emissions


Thousands of technicians have faced the challenge of bringing a particularly stubborn application into compliance for NOx emissions. High NOx readings are a clear sign of performance issues somewhere in the system. The question is, where?
Among the potential causes of non-compliant NOx readings are:
Misfire condition
Malfunctioning or improperly adjusted EGR valve
Failed oxygen sensor
Leak in exhaust tubing upstream of converter
Excessive carbon deposits in combustion chamber
Improper spark advance
Blocked coolant passage
Overly lean air-fuel mixture
Damaged cold air duct
Failed or malfunctioning catalytic converter
Corroded or damaged engine sensor electrical connections

Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.

Case Study

Oct 09, 2012 | Jeep Cars & Trucks

1 Answer

Hey i just bought a 97 sunfire and it didnt pass etest. everything was fine except the nox. limit was 505 reading was 1032. what could be an affordable solution? my understanding is that its the egr or...


Well first is the check engine light on. Egr will set a code if it is working or not. Possible cat but could be a front O2 sensor causing the vehicle to run too rich. The best thing is to run a scan to see if there are any codes and they can see if the O2 sensors are work and even check the Mass Air Flow sensor too. Good luck.

May 17, 2011 | Pontiac Sunfire Cars & Trucks

2 Answers

1994 CHEVY C1500 WITH HIGH NOX. I CAN NOT PASS THE INSPECTION.


SOUND LIKE EGR VALVE NOT WORKING NOT OPENING UP OR EGR VALVE PORT STOPPED UP WITH CARBON BUILD UP NEED TO BE CLEANED OUT.SCAN VECHICLE SEE IF EGR WORKING OR YOU HAVE FAULTY PCM.

Jan 09, 2011 | Chevrolet C1500 Cars & Trucks

1 Answer

Wont pass emissions due to high heat


Whats high heat, engine temp or NOX readings

Jun 15, 2010 | 1994 Jeep Grand Cherokee

1 Answer

1992 dodge stealth failed smog test with high NOx reading at idle. passed perfect at high rpm , failed at idle. hat causes a high NOx reading?


NOX is produced when cylinder temperatures exceed 2500 f.
Your vehicle has 2 ways to directly reduce NOX, EGR system, and catalytic converter, and also the cooling system indirectly.
Take a look at the EGR system, vacuum lines, pipes, and make sure the diaphragm moves. Disconnect the vacuum line, then push on the diaphragm and plug the hole (from vacuum line) when you release the diaphragm there should be vacuum. Also you may want to take it out and give the EGR passages and EGR valve a good cleaning, with some type of carbon cleaner like carb cleaner.

Mar 10, 2010 | 1992 Dodge Stealth

1 Answer

My 1996 Plymouth Breeze failed the CO% and the NOppm tests. What will cause these 2 tets to fail? CO%limit is 0.35 reading was 0.39 NO ppm limit is 467 reading was812 The above readings are for an Emission...


Lots of carbon in the cylinders,EGR valve not working,a dirty or leaking fuel injector,to far advanced timing.

Run 2 cans of fuel injector in 1/2 tank of gas and run it as low as you can before refueling.

I would set the timing back 5 degrees and test again,put it into service mode (check engine light on) if you have to to get timing back to cool combustion for the test.

This should lower the no% and the co% may just pass too.

Do not use premium fuel ( which is just slower burning fuel) when doing etests,or for normal driving if your engine does not require it,
It will cause carbon deposits in the combustion chamber and it will almost always give higher readings when etesting.

Nov 08, 2009 | 1996 Plymouth Breeze

2 Answers

1996 jimmy failed an emission test


Did you change the air filter. The fuel filter will have no impact on emmision's but the air filter is a very common problem.If you usually drive it at low rev.'s then before you send it for emmisions test you will need to put it in a low gear and floor it for about a mile the reason is when it is being tested the engine is reved up to around 3500 rpm and any build up of unburned fuel or oil in the exhaust system will put up the emmisions reading.

Aug 19, 2009 | 1996 GMC Jimmy

1 Answer

Egr valve for plymouth voyager


I had rough idling,do not pass NOx emission?

Nov 29, 2008 | 1992 Plymouth Grand Voyager

Not finding what you are looking for?
1991 Chevrolet S-10 Logo

209 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8210 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...