My 1992 Previa 1992 didn't pass the emission test. Check engine light not on. The NO level is too slightly high. It need to be 956 or lower on the 25/25 test and it pass on the 50/15 the first time.

10

Asked by Dec 31, 2011 at 08:09 AM about the 1992 Toyota Previa 3 Dr LE Passenger Van

Question type: Maintenance & Repair

It's running fine. Although my oil light came on and I know the oil needs to be changed. Would that be the cause of it not passing that part of the test? I changed the gas filter and put some fuel injection cleaner in the tank and drove half a tank of gas through and it when down on the 25/25 test but not enough to pass but then the NO went up on the second test. What do I need to do to fix this problem?

4 Answers

85

okay, this may not sound real technical and I certainly cannot explain why or how it works, but here is what I did, and never have a problem passing emissions. Local auto supply store carries a product called "guaranteed to pass", its some type of fuel additive that costs around 20$, and if you use as directed and don't pass, you get your money back. I was skeptical, until I used it. And recommended it to this or that friend, who also found success with it. Thats about all I can suggest to you, all the other emissions repairs are fairly spendy and I wanted to exhaust all other options before taking that route. Fortunately, I did not need to! Hope it works for you.

1 out of 1 people think this is helpful.
10

Thanks for the information, it used to be sold at Walmart but they don't carry it anymore. I brought some Lucas fuel injection cleaner for $9, changed the gas filter, and got my oil changed.It passed.

1 out of 1 people think this is helpful.
20

Excessive NOx is produced when the combustion temps inside the cylinder are too high. Introducing exhaust into the intake lowers these temps. My 1993 Previa failed the NOx test because the small passage through the intake manifold, from the EGR valve, was stopped up with carbon. I had to clean that passage out with a sharp pick and carb cleaner, so the EGR valve could pass exhaust into the intake manifold. This was a few years ago, but as I remember, it was kind of a headache because I had to unbolt the intake manifold to get to it. I also had a 1989 Ford F150 that failed the NOx text every 2 or 3 years. The EGR valve on this truck would get plugged up with carbon, and I had to take it off, and break it free. The cone shaped valve on the EGR was made out of tough metal, so I could tap it with a hammer until it broke free. I then used carb cleaner to flush it out. I had that truck for about 10 years, and this consistently happened, but it always passed after doing this.

2 out of 2 people think this is helpful.
10

Thanks Larryboy89, but once I got my oil change and drove some more after changing the gas filter and putting some Lucas fuel injection cleaner in the gas it passed. Thanks for the information.

Your Answer

Add photo

Related Questions

  • Why won't my 92' Previa start sometimes? 3 answers

    I've had my 92' Previa since 93'. Recently, it has developed a starting issue. It seems to happen after I've been driving it for several hours and when I stop to get gas or some other brief errand, ...

    1992 Toyota Previa

    -

    Maintenance & Repair

  • 92 Previa Won't Acelerate past 40mph seems like not getting fuel 15 answers

    changed plugs no difference

    1992 Toyota Previa 3 Dr Deluxe Passenger Van

    -

    Maintenance & Repair

  • Heating Blower Problem 5 answers

    My front blower works only at times. Sometimes when I move the blower switch, it does not blow at all. At other times it will blow nicde hot air but eventually it slows and then stops. I assume the bl...

    1992 Toyota Previa 3 Dr LE Passenger Van

    -

    Maintenance & Repair

  • 93 toyota previa having white smoke while starting and stu-off while running on the road. 5 answers

    93 toyota previa having white smoke while starting, and just happen for the car slow down by itself and stopped then white smoke again, guessing the coolant go into engine already cause coolant gone ...

    1993 Toyota Previa 3 Dr LE All-Trac AWD Passenger Van

    -

    Maintenance & Repair

  • where can i download a free 92 owner's manual in pdf form? 3 answers

    Can you help me find an owner's manual for my 92 previa? Engine oil light is always on. Thanks.

    1992 Toyota Previa 3 Dr LE Passenger Van

    -

    General

Previa

Looking for a Used Previa in your area?

CarGurus has 20 nationwide Previa listings and the tools to find you a great deal.

ZIP:

Search Toyota Previa Questions

Toyota Previa Experts

#1 ttdsgnr5
ttdsgnr5
Reputation 150
#2 martyman
martyman
Reputation 130
#2 gertis
gertis
Reputation 130
View All

Related Models For Sale

Used Toyota Corolla
1,414 Great Deals out of 69,992 listings starting at $988
Used Toyota 4Runner
426 Great Deals out of 20,862 listings starting at $2,499
Used Toyota Camry
1,520 Great Deals out of 101,602 listings starting at $700
Used Chevrolet Astro
313 listings starting at $900
Used Mazda MPV
379 listings starting at $3,995
Used Toyota Pickup
125 listings starting at $2,250
Used Nissan Pathfinder
602 Great Deals out of 27,175 listings starting at $1,795
Used Toyota Land Cruiser
26 Great Deals out of 1,215 listings starting at $4,500

Used Cars For Sale