4Runner 3rd gen high NOx failed Emissions my Fix!
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- Опубликовано: 16 окт 2024
- 1998 4Runner SR5 V6 with about 170,256 miles on the clock failed Colorado Emissions because of high NOx values.
Fix: 7 bottles of gas line drier Heet, and 1 bottle of Guaranteed to Pass in a 1/2 tank of fuel.
Background:
Before failed test:
Replaced both O2 sensors
New Cat, muffler, and exhaust piping
Recent oil change, with oil filer
Recent fuel filter
1/2 used air filter still good
1 year old injectors
1 year old spark plugs and wires
Newer belts
Hoses are ok
New radiator coolant
New power steering fluid
Brand new Optima battery
Else all in good maintenance condition.
1 attempted it failed because of high NOx values which means high combustion temps. Bad EGR, bad cats, poor maintenance.
Vehicle does not have EGR valve, and the cats are brand new
Also tested when the engine and outside temp was hot. Outside temp 96 degrees
Failed values:
Tested temp: 96 degrees outside
HC: 0.4222 Limits: 1.200 Pass
CO: 3.0041 Limits: 15.0000 Pass
CO2: 410.7751
NOx: 2.6018 Limits: 2.5000 FAIL
Passed Values:
Tested temp: 76 degrees outside
HC: 0.4664 Limits: 1.200 Pass
CO: 2.3501 Limits: 15.0000 Pass
CO2: 428.0696
NOx: 2.0092 Limits: 2.5000 Pass
What did I do differently? My Trick?
Changed the air filter
Tested in the morning when the outside temp was 76 degrees
Added the following to a 1/2 tank of fuel
Added 6 bottles of gas line drier Heet (Yellow bottle)
Added 1 bottle of gas line drier Heet with fuel injector cleaner (Red bottle)
Added 1 bottle of Guaranteed to Pass
Everything else all the normal suspects were recently replaced.
If you have high NOx: Go to the test station when it is cooler, make sure all your maintenance is recent, good O2, and cats, etc
If you have high HC or CO this is the usual fix:
New Air, oil, and fuel filters
Oil change
Spray the MAF with MAF cleaner
Flush your engine coolant
Pump up your tires to max or slightly higher psi (less rolling resistance)
Replace your O2 sensors
Replace your Cats and muffler
Replace vacuum lines hoses
Add 6 - 8 bottles of Heet (yellow bottle) to a 1/2 tank of fuel
Take it hot and in hot weather
I have over 30 years experience dealing with the Colorado Emissions games of passing cars and either those fixes work for me.
Once your car reaches over 25 yrs get collector plates and no more #$% emissions.
Experience:
1970 Chevelle: Full tune up, Heet, and it passed!
1983 Olds Full size with 5.0 L notorious for failing. A big name auto shop could not get it to pass. One weekend my dad and I replaced vacuum hoses, 8 bottles of Heet, new plugs and it passed!
1989 Ford Towncar in Los Angeles failed. I had a local shop replace the O2 sensor, tune up, and 6 bottles of Heet and it passed!
1998 4Runner all new sensors, cats, filters etc, with 7 bottles of Heet it passed!
After you get your car tuneup replace spark plugs and wires, oil change, new air filter, new fuel filter, new O2 sensors, new cats, and fluid changes if it still does not pass use Heet.
Good luck
Hard start on my 95 impala I changed fuel pump thinking that was the problem, it was the $37 egr valve it might be egr valve thank you for your video I have same problem in a 96 impala now
Glad you found the issue! Thanks!
@@denverhomestead1003 thank you GODBLESS!!!!
Damn!!.. Over Dose Of HEET!..What ever works my Amigo!👍
Haha never enough alcohol
My 98 4runner didn’t pass last week due to high NO. I did a similar thing, but just cleaned out the maf sensor, put 91 octane, added fuel injector cleaner, crc emissions system cleaner before i drove it straight to dmv! Passed smogged!
Congrads!
Thanks to youu i passed my smog!!!!!! Saving this video!!! THANK YOU!!!!!!!!!!
Awesome so glad to hear! Thanks for the comment!
That guaranteed to pass works extremely well in our case. Have a 04 Jeep Wrangler. I had replaced all the O2 sand was still throwing in catalyst efficiency codes. Put a bottle in a fuel tank of 93 octain and drove it. The light went off and has stayed off. I to keep all the fluids changed the plugs every 30, 000k. I do the fuel injection service on it and clean the throttle body as well. In my opinion that stuff works quite well and I have recommended it several times to people.
Glad to hear it worked and thanks for the comment.
Awesome glad to hear. Yep I was tempted by guaranteed to pass. Glad it worked out
@@denverhomestead1003 I'm gonna give the BG products a try. The MOA and the 44k.
Always smoke test the intake if you fail with high NOx, probably just a vacuum leak My 3rd gen failed with high NOx. Smoke tested it at work, just a a split vacuum line. Fixed for a buck or 2 and 30 minutes of my time. Passed no problem
Awesome great tip thanks
Thanks so much I am going to try that I failed with high NOx
I also failed with high nox and I'll give this a try
This video solved the problem on my 2000 nissan frontier emissions passed with no problems Excellent video thanks a lot....
Awesome so glad to hear thanks!
The only thing I did... was seven bottles of heat..... and this fuel injector cleaner.... and this G2P. What you left out was that you also went early in the AM to try obtaining better numbers, you also shut down your engine to have a lower engine temperature during the test.
Yes good point. Glad it helped
@@denverhomestead1003 That is a great trick though for someone that might be juuusssstttt over the number.
Have they changed the NOx limits since 2020? Today - Aug 8th 2022 - the limit is 1.5000 - not 2.500? Mine is a 2000 Xterra.
I don't know. I saw the same change. It is flipping annoying.
It is now 1.5 gpm. I just failed at 1.7 gpm which is bullshit because passed 2 years ago no issues. But now the libtards of California have brought their rules here and ruined it for all of us. I have a 02 nissan pathfinder and I'm not sure how I'm gonna fix this other than what u suggested. I do have one new cat but the other side is original.
I have changed one 02 sensor too. My car is not throwing codes at all and the scanner says emissions pass! Go figure.
Smog center never tells you to put the EGR valve back on? Most smog places tell you if parts are missing
Great point. All smog crap on the vehicle was in good condition.
Thanks for the video great job
Thanks for watching!
Thanks for the video great job 👍
Thank you for the comment! Good luck
WOW!!..All that you've done should of made it PASS easily!..I would take it on the Freeway & get it up to your states top speed limit for at least 30 miles
Thanks for the comment and note
Hi
I live in Denver like u and recently failed a third time for nox. I was at 1.7 gpm. Changed the plugs so then 1.68. Then I took to an emissions tech and they fuel trims and o2 sensors look good and rear o2 sensors indicate maybe cats are bad. I changed right bank cat myself 2 years ago due to p0420 code before all these standards changed. It's an epa compliant cat. Then just now I changed the left bank cat to a carb compliant one. Still failed nox at 1.5765 gpm. Just unbelievable. So my question is can the heet trick work since I'm basically less than 8 hundredths away? Or do I need to update the epa cat to a carb one? I'm concerned the cats won't fix this. I don't have an egr valve on my 02 nissan pathfinder but have an egr solenoid. I don't think I have a vacuum leak. I figured the emissions shop would have told me if I did. Thoughts?
Change out the EGR solenoid if you can. I think the cats are fine. Good that you changed out the O2 sensors. I know the heet nudged my numbers. This year I tried colder heat range plugs which helped. Also try to go on a really cold day or in the morning. My 4Runner does not have an EGR so I do not have any experience changing out. I know it is really @#$ frustrating they changed the standards without telling anyone. Also try that other stuff I put in my tank. You might try to go to a different station I think they may not be fully calibrated between stations. Sorry I could not provide much more. Good luck
Did your 4 runner pass this year I am having issues on my 99 tahoe and now the limits are even lower so it makes it more difficult to pass I live in Lakewood Colorado I'm from denver born and raised I like your video just trying to see what u can do to pass I used g2p and failed but I didnt try adding heet to it where can I purchase the heet from
You can purchase Heet from O'reiley or Autozone, or Walmart...The only stock a few bottles until Winter, so you may need to go to different stores to get a large quantity.
I recently had to go through emissions test with the same 4Runner for this year. I tried using colder heat range spark plugs and nothing else and it worked well.
I think the stuff in the tank is a quick fix to nudge the numbers in your favor, but a better fix maybe colder spark plugs and of course new air filter, recent oil change, no vacuum leaks, sensors good, no trouble codes...Good luck.
I know it is flipping frustrating they lowered the numbers without telling anyone...
@@denverhomestead1003 thanks buddy I appreciate the help
How does my v8 mustang have a nox limit of 1.5 when your v6 has a 2.5??? Mine passed with .9 last time but this time im at 2.5.
this many bottles of heet wont do any damage to the engine right?
I just used 16 bottles (June 2024 for the test) and I have not experienced any negative issues. However, I am not a professional so use at your own risk.
@@denverhomestead1003 did 7 bottles not work anymore so you had to move up. same amount of gas?
@@xprtgamerz9962 Yeah you are right. I just had to go through this fun. I tried 16 bottles with no success.
I replaced almost every flipping sensor, ran a few tank fulls of fuel injector cleaner, and a bottle of Octane booster. Drove the crap out the 4 Runner and it finally passed (barely).
Note: If you are not passing and everything is good, tune up. Go to a different stations
So even though I dearly love HEET but sometimes it takes another approach.
I
Why six bottles?? I thought one of them is enough for 20 gallons ?
Good question. I like overkill. Actually the intended purpose for the Heet is to dry out any water in the system so yes 1 bottle to treat 20 gallons is correct. However, from my personal experiences (over 30 yrs) in dealing with emissions (in both CO and CA and old cars) is more alcohol to burn cleaner. It always helped me. So far I have not experienced any negative effects of using 6 bottles or more.
I have a 1988 gmc s15 pickup and its wont pass smog because the nox is at 2000 and its suposed to be below 700, it runs at 3000 rpm at idle and makes popcorn noises when its warming up. Any recomendations of what I should change.
Check the basics: Tune up new spark plugs, new spark plug wires, oil change, new oil filter, new air filter, and new fuel filter. 02 sensors check or replace. Check or replace all vacuum lines. New gas cap. Clean the MAF sensor with MAF cleaner. Clean the throttle bottle with spray cleaner.
I have heard hig NOX is caused by high temps. Make sure the fan and cooling system is good. Check fuel pump pressure. Some research says low fuel pump pressure or bad fuel regulator could cause high NOX.
A clogged cat could also cause issues. So check the exhaust system if it is solid. Sadly this is my first experience with high NOX on my ride. It is really annoying because updating\fixing all of the basics usually does the trick. Again good luck. Failing emissions is so flipping frustrating.
Ok thanks I’m gona clan out my exhaust, change the catylic converter and use Heet to see how it goes
its the erg valve and erg vacuum modulator and de carbor intake ports that lower nox
Cool thanks. I did have the intake de-carbon before from a shop but not the EGR thanks for the tip!
Lean running causes high cylinder temps. Need to check fuel trims to solve it.
Cool thanks.
Could you explain more, what do u mean @Bryan
@@Ducttapewallets100 Your short term trim should be fluctuating near zero. It will change from positive to neg
But normally is between neg 2 to pos 2. This means the o2 sensors are working and the ecm is able to correctly add or subtract fuel based off o2 values.
Intake temp sensor.
my 96 runner with 408k miles just failed. hoping to pass it again soon lol
Did you drive the car on the freeway before the test?
No freeway driving. just about 5 miles to the station at 45 mph. I have read a lot of forums you should drive on the highway before but I was lazy ;)
@@denverhomestead1003 what about on a boosted turbo car
@@denis69ist Hi it "should" work first try the basics: tune up, new plugs, wires\coil pack good, new filters, oil change, good 02 sensors, good vacuum lines, good TPS and MAF. Or clean MAF with spray cleaner. Then maybe try the Heet first. In theory it should not effect boosted turbo or supercharger cars since it is just fuel additives. But use at own caution. Good luck
If im correct o2 censors came in every car after 1995
Yes actually 1980s cars with smog control. All fuel injection cars from the mid 1980s and today have O2 sensors. I have heard they should be replaced every 90k. Also check the timing chain or belt if the cam is slipping it could also cause high NOX. Good Luck
Continually driving a vehicle with a high nox reading after you scam the test will still result in preignition and severely destroy your engine.
So far 2 years ok. I will dig deep and work to resolve
So the cat was m clogged or was it because carbon build up
The cat was new and not clogged. It could have carbon build up in the intake however it was cleaned 1 yr prior. At least for now it passed. Many people say the fuel pump pressure could be low. Before the next required testing I will double check the fuel pump pressure.
Should be running regular unleaded
Good point and tip thanks
Old video, this truck failed emissions because the mileage is too good. The engine is running slightly lean and in great condition. This causes the fuel to burn hotter and cleaner resulting in more expansion of the air in the cylinder and more work being done per injection of fuel. This is an ideal condition to have but because of NOx being regulated it failed because it is running too well and creating NOx which only exists in the air for about a day before the sun breaks it down. The way to pass this test is to cause the engine to run richer and use more fuel making the engine burn less efficiently and cooler which will increase the other pollution readings but decrease the NOx reading.
It's completely backwards from what should be the goal. To have the most efficient engine you would want the highest NOx readings but people who don't understand engines are in charge of deciding what amount of tailpipe emissions are okay and a great vehicle like this fails.
You can also create a bad restriction in the intake system and pass emissions then remove the restriction. A very dirty air filter would make this truck pass.
Excellent, excellent reply! I totally agree with you!
Yep my 1998 4Runner (well maintained) still experiences the same. I recently June 2024, took 4 re-tries to pass. All of the new cars are computer controlled, so you cannot (aside from a CPU reprogramming) change anything (timing, rich/lean) like you could in the old days. It is very, very annoying! In addition, they lowered the limits so those with old cars struggle to play the emissions game. Exactly like you said with NOx.
I recently spent about $900 in fuel additives, and replacement parts: MAF, spark plugs, vacuum hoses, new air duct from filter box to throttle body, both O2, air filter, and PCV. Just to get it to squeak by to barely pass. It is very frustrating because it is a well maintained vehicle.
Oh: After I failed the 3 time: I took it to a special Emissions Training facility for them to look at it. Although it was a free inspection. They said I need a CA CARB CAT.
Mine: Is
yes the EGR valves job is to lower NOX levels. it is responsible for 80% of Nox reduction. Start with the EGR system check after checking the timing.
Thanks for the tip
Your numbers before/after are within normal test variability. You didn't fix anything.
I know..but it passed...the second time
Your wasting a lot of money because of the air filters. Your basically wasting them.
How do you mean? Any help or tips for next time is helpful? Thanks for the comment and for watching.
Do not use heet in your gas for smog!!! i just went through all of this... my first smog test with no heet in tank failed with barely high HC. I added heet to my tank and failed my next smog test with high NOX... I ran most of that tank out and just ran 87 octane and passed.. Heet will drive your nox numbers up. And it leans out your fuel. twice i failed smog for high Nox with heet in my tank.
Good tip and sorry you had issue. In my other video I used a lower heat range of plugs. Hopefully in about 10 yrs I can get collector plates and not worry about stupid tests again
DO NOT USE THIS CRAP!
My first test failed with high HC.... I poured heet in my tank. I failed with high NOX... I passed after running that crap out of my tank and just filled with 87octane...
Sorry about the issue and thanks for the tip