Failed Emissions
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Failed Emissions
Took my Ranger in for Texas Emissions testing a failed miserably!
Here are the results:
25 MPH 15 MPH
Std Mine STD Mine
HC (ppm) 151 162 155 275
NOX (ppm) 956 1322 1046 2111
The oil is about 3 months old so here's my plan:
New Oil, new plugs, new wires, new O2 sensors, 93 octane gas,
bottle of octane boost.
Anything else!
BTW - great information on this forum!!!
Thanks for the help.
1992 Ranger XLT
3.0L
5 spd, 2wd
Here are the results:
25 MPH 15 MPH
Std Mine STD Mine
HC (ppm) 151 162 155 275
NOX (ppm) 956 1322 1046 2111
The oil is about 3 months old so here's my plan:
New Oil, new plugs, new wires, new O2 sensors, 93 octane gas,
bottle of octane boost.
Anything else!
BTW - great information on this forum!!!
Thanks for the help.
1992 Ranger XLT
3.0L
5 spd, 2wd
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Joined: Dec 2002
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From: peoria, az
Failed Emissions
Does that thing have an egr on it? Can't seem to find one on my dads 4.0, that's why I ask but, your high nox readings is a product of high combustion temps. The EGR controls this. If you have one, test it to make sure it works. Push the diaphram in at idle and it should kill the motor.If it does, make sure it gets vacuum to it above idle (about 1200-1500 rpms) If it doesn't kill the motor then it,s either bad or the ports under it could be plugged. If you don't find a problem here then start looking for a lean condition. If you have over 80,000 miles than your valve needs to be replaced anyways. Hope that helps.
Tuned
Joined: Jun 2003
Posts: 295
Likes: 1
From: poughkeepsie ny
Failed Emissions
Low viscosity oil would help (5w-30, for example). Also I would try taking the air cleaner out all together. Even less restriction there. Cleaning or replacing the EGR is a very good idea. Make sure your truck isn't running too hot or too cold (referring to the coolant here). Check the level (at least) and replace thermostat (double check the auto parts guy gives you the right one!!). If thermostat opens too soon or is missing altogether, truck will run cold and injectors will be told to dump in more fuel in an effort to get things up to operating temp. If thermostat opens too late or not at all, truck will run hot and N0x emissions will go up.
Speaking of operating temp, make sure they test the exhaust once your truck reaches it. It's not a valid reading if they do it earlier, since the 02 sensor and the cat havent had a chance to warm up yet. If 02 isnt warmed up, mixture is at preprogrammed default which is often set on the rich side. If cat isnt warmed up, the chemical conversion that goes on inside the thing isn't happening to any large degree.
Speaking of operating temp, make sure they test the exhaust once your truck reaches it. It's not a valid reading if they do it earlier, since the 02 sensor and the cat havent had a chance to warm up yet. If 02 isnt warmed up, mixture is at preprogrammed default which is often set on the rich side. If cat isnt warmed up, the chemical conversion that goes on inside the thing isn't happening to any large degree.
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From: peoria, az
Failed Emissions
That one got by me again. Good point on the thermostat. This mostly causes CO to be high though. Haven't seen one affect NOX yet but, I guess it could happen. I believe this is the right path though. If you get the NOX down the HC will go with it. You wouldn't believe how many good mechanics will overlook the thermostat when it comes to emmissions failures. Make sure your truck is GOOD AND WARMED UP before you get there. I like to take a good hard 3-5 mile drive before going.
Last edited by Ken00; Sep 5, 2003 at 10:37 AM.
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Failed Emissions
Thanks for all of the help....good stuff.
I took a look at it last night and replaced the air filter (really needed it) and the PVC valve.
Here is the strange thing. I went looking for the EGR valve according to the handy dandy Chilton's and could't find anything remotely like it. Seems to me a read another thread on here talking about the 3.0L not having and EGR?? I was surprised that it doesn't have a smog pump as well....
Stepman - you said that your 4.0L doesn't have and EGR either? Is there something else I should look for?
I pulled one of the plugs and they definately need replaced. I think I'll go ahead and do a new thermostat and flush the system as well.
The EGR thing really has me confused....
I took a look at it last night and replaced the air filter (really needed it) and the PVC valve.
Here is the strange thing. I went looking for the EGR valve according to the handy dandy Chilton's and could't find anything remotely like it. Seems to me a read another thread on here talking about the 3.0L not having and EGR?? I was surprised that it doesn't have a smog pump as well....
Stepman - you said that your 4.0L doesn't have and EGR either? Is there something else I should look for?
I pulled one of the plugs and they definately need replaced. I think I'll go ahead and do a new thermostat and flush the system as well.
The EGR thing really has me confused....
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From: peoria, az
Failed Emissions
what kind of test are they running there in texas now? We just had the local garages do the testing when I lived there. Do they take other readings like CO? If so, how are your numbers on that?If your plugs are worn out like you say , that will make your HC's high. I haven't figured out how ford can control Nox w/out an EGR. Still looking for the answer to that one.
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From: peoria, az
Failed Emissions
llrando, check this out. https://www.ford-trucks.com/dcforum/...D116/1211.html not sure how to do that . Hopefully you can get there and it helps.
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Failed Emissions
The link the that post helped...exactly what I'm seeing. Doesn't look like I have an EGR to worry about. Hopefully the other things will resolve the problem.
Stepman - The emission testing in TX (only certain counties require it) are done by local stations that installed the test equipment. They do check the CO and I did pass. Here are my readings:
High RPM Low RPM
Std Mine Std Mine
CO 1.68 .26 1.31 .54
CO2 14.2 13.7
O2 .5 .9
What temp. thermostat should I use?
Stepman - The emission testing in TX (only certain counties require it) are done by local stations that installed the test equipment. They do check the CO and I did pass. Here are my readings:
High RPM Low RPM
Std Mine Std Mine
CO 1.68 .26 1.31 .54
CO2 14.2 13.7
O2 .5 .9
What temp. thermostat should I use?
Posting Guru
Joined: Dec 2002
Posts: 1,428
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From: peoria, az
Failed Emissions
Those aren't all that bad readings really. (except the failing ones) Not sure what that calls for temp-wise. Most everything today is using 195. Whatever it came with initially is what I would put in it. Looking at all your numbers together, it appears that your convertor just wasn't warmed up or maybe isn't working.It's no fun to just guess at things and hope you pass. Gets expensive to keep paying for a retest. This is where it's nice to know someone with a machine that check it out before you go. I used to have to make several trip a year(testing) until I finally convinced my wife that buying a machine would be cheaper. Good Luck getting it thru. Man, that reminds me, I have to take mine thru this month too.
Tuned
Joined: Jun 2003
Posts: 295
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From: poughkeepsie ny
Failed Emissions
What temp. thermostat should I use?
I myself have gotten more than a few incorrect replacement thermostats from the average parts discount place (CarQuest and Advanced Auto, to name a few).