Fuel additives to pass emissions - Castle Products
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Fuel additives to pass emissions

The 7 Tips that Will Help You Pass the Emissions Test

To be observed: Before arriving to the emissions test center.

1. Running Right - Do not get an emissions test if you suspect your vehicle is not driving, running or functioning properly. Consider this, many vehicle's do not pass the emissions test although their owners never suspected any problems. They're simply shocked when they find out. Now, if your vehicle is already experiencing obvious problems, don't waste time or money on a smog check. More then likely it will not pass the emissions test and you will lose your inspection fee. Seek repair assistance first. This will insure your vehicle passes the emissions test the first time. Plan ahead.

2. Check Engine Light Off - Check engine light should not be on. As discussed in our functional test page, an illuminated check engine light will cause your vehicle to not pass the emissions test automatically. A certified emissions repair shop can use a trouble code retrieval tool to extract trouble code data from the ECU and perform necessary repairs to turn the check engine light off.

3. Inflate Tires - As mentioned above, during the smog inspection the smog technician may need to drive your vehicle on a dynamometer. Insuring your vehicle's tire pressures are even and correct will help you pass the emissions test. Correct tire pressure will allow the vehicle to be driven with greater stability and control during the emissions test. This will greatly improve your chances of passing the emission test by allowing the engine to maintain a constant and steady load. Accurate tire pressure (as required by the tire and vehicle manufacturer) may be the deciding factor between a borderline vehicle passing or not passing the emissions test.

4. Change Engine Oil - If you haven't performed an oil change within the last 5, 000 miles, go ahead and do it before the emissions test. This will assist in getting passing emission test results. Your vehicle's Positive Crank Ventilation (PCV) system is designed to allow the engine to breath fumes from the oil compartments. The fumes are then burned through the combustion process. If the oil in your engine is contaminated due to inadequate oil changes it may very well cause your vehicle to fail the emissions test. Contaminated oils are high in Hydrocarbons (HC) and will present a rich mixture to the combustion chambers. Not performing regularly required oil and filter changes not only causes premature engine wear but can also cause your vehicle to not pass the emissions inspection.

. Take a Drive - Drive your vehicle for at least 20 minutes prior to arriving at the smog station. This will ensure your coolant, oil, and catalytic converter reach and maintain optimum operating temperature. This will help your vehicle pass the emissions test as well. Remember your engine is a fuel burning machine. To ensure a passing emissions test and adequate combustion it needs to have sufficient time to warm-up and this can be accomplished through driving for at least 10 to 15 miles. Emission test standards require a smog check technician to ensure a vehicle is at proper operating temperatures prior to administering the emissions test, however this is one conditioning that will help pass the emissions test which you can perform as well.

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Popular Q&A

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Catalytic converter melted?

I brought my car in to get the fuel pump replaced, and they told me that the catalytic converter had melted, because of the broken fuel pump. If I continue to drive the car, before I'm ready to get that repaired, what will I notice different about the car in terms of performance, fuel economy, emissions, and any additional damage that could happen...?
2008 Hyundai Sonata
2.4L, Inline 4
ODO: 142,000

The converter itself doesn't melt. It's the catalyst inside that melts. This causes a restriction of the exhaust gas flow and performance suffers.
A fuel pump shouldn't affect the converter IMO. Bad injectors or misfiring can though.
Ask how they KNOW the catalyst has melted.......are they just guessing or what?? As far as I know, the only way you know for sure is to remove it and look inside, or if it's melted inside the outside of the converter will get red hot after running for a while.

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Plymouth grand voyager 1999 is not showing the readings on my dash for the fuel, speedometer, and has not passed emissions. What could be the problem?

Here is the procedure to check the gage connector on the back of the instrument cluster. The procedure is a lot longer if you have a mechanical PRNDL indicator in the cluster. I'm thinking you don't. You don't need to remove the cluster as the procedure says, because you're just going to check the connectors on the back. You just need to take the screws out and tilt it forward far enough to reach in and push the connectors in.


REMOVAL & INSTALLATION See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12

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Best fuel additive to pass smog check?

Save your money and put it towards repairing the reason it won't pass. There is no "magic potion".

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