Question about 1989 Ford Ranger

3 Answers

Failed emissions test

I have a 89 ford ranger 2.9L that failed emissions. it failed in all fields.

HC(PPM)
cruise limit 150
Cruise emissions 268
idle limit 220
idle emissions 340

CO%
cruise limit 1
cruise emissions 3.59
idle limit 1.2
idle emissions 6.18


so my question is how do i fix this with out having to take it to a shop

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  • don_kinsman Jun 05, 2009

    any way i can by pass the whole getting a new cat? i did clean the throttle body after i replaced the plugs a month or two back.

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Hi Don,

First, thank you for asking me for my input on this. It just so happens, that I used to own a Ford ranger that had the same engine as yours. It was a 1990, but there are few changes to these model years.

Anyway, there is only one reason that your HC levels would be high. Your engine has WAY too much unburned fuel in the exhaust. The same reason applies to high CO levels. Too much fuel and/or not enough air.

Below is a link that you may find very helpful. It explains exactly what we are talking about here and also lists some of the possible causes.

EMISSIONS ANALYSIS

Incidently, when I had the same emissions failure on my truck, replacing the air filter and replacing a failed MAP sensor fixed it. - I did NOT have to replace the catalytic converter. If the numbers are as high as you listed above, you will only destroy a new converter anyway because there is obviously not enough oxygen in your exhaust system for the catalyst to function properly. Those numbers are nearly DOUBLE the allowable maximum. If the engine is running correctly and the catalyst is good, your numbers will be WAY BELOW those maximum numbers.

Please understand that I am NOT telling you to replace your MAP sensor without proper diagnosis. There are many possible causes here. Please click the link above and read the article. It will help you to understand what is going on here.

Posted on Oct 23, 2011

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Looks like you need a new catalytic converter and an injector pressure clean, also clean the throttle body and the airbypass valve..

Posted on Jun 03, 2009

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Pull the advance plug (Mushroon shaped plug with two wires on right side of motor) and set timing to 0 degrees. This has worked on my 1989 2.9 stx in Texas. Runs bad with no power but it should pass emisions. This trick lowers nox gasses to an acceptable level.

Posted on Sep 30, 2011

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Posted on Jan 02, 2017

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Here is some info for you to read, besides me explaining what ppm is, i also gave you some info of how to solve this, Ain't that special LOL. Mike

Overall Result: PASS or FAIL. A vehicle with a properly operating engine and catalytic converter will have very low HC and CO readings. However as a vehicle ages the HC and CO emissions will increase and may become erratic. As a vehicle ages it becomes increasingly important to be sure that the engine and converter are fully warmed up before the test to have the best chance of passing the test.

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These are the possible problems:

bad o2 sensor
bad EGR valve
bad cat
bad timing
dirty injectors
bad plugs or wires
the less costly fixes include replacement of the o2 sensor and EGR valve i would not clean the EGR I would buy a new one there are very cheap you can pick these up at any local parts store .
also run some injector cleaner through your car at least a full tank of gas and one bottle of injector cleaner should be ran through.
you can also have your timing checked for a relatively low price.
and when you go into to have the vehicle checked make sure the car is been running because your cat convertor has to be warm in order to preform at it peak so do not do it when the car is cold.
all of the above are pretty reasonable fixes the general rule of thumb when you work on your own vehicle is start with the cheapest fix first then go on to the next.

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