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1994 f350 4x4 failed emissions

1994 f350 5.8 L . failed emissions ,new O2 sensor . also idle is abit high.

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Posted on Jan 02, 2017

  • 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

  • 12 Answers

SOURCE: 1994 s10 service engine soon light

Have you had the truck scanned for codes? If so, what was the code, codes? Why did you replaced those listed parts. Can you hear any hissing noise coming from the engine or engine compartment?

Posted on Sep 04, 2008

  • 34 Answers

SOURCE: Locate O2 Sensors in 1994 Cadillac ElDorado

o2 will not make your car do that you have other issues check for secondary ignition miss or primary ignition miss sounds like you are dropping a cylinder dumping raw fuel to contaminate 02 sensor find the real problem to fix your light

Posted on Nov 22, 2008

  • 362 Answers

SOURCE: o2 sensor 1996 volvo fail emission test

If you have trouble codes stored in your cars computer for O2 sensors a fuse will not fix it. One or all of the O2's may need to be replaced. There are test that can be done to confirm which one.

Posted on Jan 28, 2009

  • 3 Answers

SOURCE: 1994 Mazda Protege 1.8 SOHC failed emissions HELP!

have your EGR system checked . sounds to me like its not working or clogged

Posted on May 03, 2009

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I have 2 o2 sensors upstream and downstream before cat does this effect the co reading on colorado emissions test?

O2 sensors can and most often will affect your emissions readings. Changing the catalytic converter is USUALLY transparent to the tests, so long as they're working right.
Best suggestion, since you're spending money altering the systems anyway, is to run it. If it fails, you get one free retest. If it fails, put the O2 sensors back where they were at from factory and use the retest to check again. If the numbers are similar, you've got physical problems otherwise going on.
Overall, bear in mind that they put those sensors upstream and downstream for a reason.

Jun 20, 2014 | 1994 Mercury Cougar

1 Answer

My 2001 vw passat 1.6 petrol failed nct. Emissions low idle and high idle too high

change the O2 sensors and if that doesnt work then its a new cat ,you can test the sensors first if you have a automotive test meter though its easy with the right gear ,the two wires with the same colour should read 12v heater circuit and the other two should read a variation from 8v to 12v depending on engine speed

Aug 17, 2011 | 2001 Volkswagen Passat

1 Answer

I just failed my emissions test due to "High HC"

The simplest thing you could do is inspect the connectors to the sensors. You can also try cleaning the intake and the sensors using carb cleaners or tuner cleaner. Check also for vacuum hoses that may have gone bad or could be loose.

May 31, 2011 | 1999 Isuzu Rodeo

1 Answer

1989 f150 302 V8 fuel injected emissions problem. Installed new engine from Ford, blew SKY HIGH on low and high idle emissions. Emission numbers were 10-20x max legal limit (over 3000). Replaced the...

the O2 sensor works on one volt .5 is around the running voltage, i would refit the air hose as it will run the converter hotter at idle.

Apr 26, 2017 | 1989 Ford F 150

1 Answer

91 geo tracker failed emission,high co and hc at idle and cruis

How about changing the Engine AIR filter. Start with the easy and inexpensive things first.

Sep 07, 2009 | 1989 Geo Metro

1 Answer

Fails idle emissions test hc

High HC?
****** ignition timing....this will lower HC but raise other values during test.
Do you have room to increase other values?
After test return timing to the most advanced position without spark knock under load for best MPG.

Aug 11, 2009 | 1991 GMC K2500

2 Answers

Idleing Problem

IAC valve. It regulates your idle.

May 21, 2009 | 1994 Mitsubishi Galant

1 Answer

1994 Mazda Protege 1.8 SOHC failed emissions HELP!

have your EGR system checked . sounds to me like its not working or clogged

May 03, 2009 | 1994 Mazda Protege

2 Answers

Ford failed MOT on High CO emission

High CO usualy means the O2 sensors are not reading properly. Take it to a parts store that can read codes, I know Auto Zone does in my area. If it is the O2 sensor it is an easy fix but the sensors run about $50.00 each.

Apr 18, 2009 | 1995 Ford Escort

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