Fuel Not Burning

[Dominus]

So I took my SVX to my local service station for its annual inspection/emissions test. It pasted the inspection just fine, but not the emissions test. Apparently although the emissions are fine while it is driving, when it is idling it isn't burning up all the fuel and there is some detectable amount left. The mechanic suggested I raise the idle to like 1000 rpms to try and get that fuel to burn and he would reinspect it. So now I guess I need to know how to adjust the idle. He didn't know and also added a comment about not being allowed to or something. Does anyone know how to temporally raise the idle to burn off extra fuel or have another solution?

[92snowmachine]

you can raise the idle by adjusting the idle stop, it's a small screw on the passenger side of the throttle body, you can also adjust your tps to raise the idle. i would recommend actually fixing the car because if it is running too rich then that extra fuel is going to destroy your converters. if you just want to make it pass then try creating a small vacuum leak to lean it out, just unplug a small vacuum line, you can also put e85 in and the emissions will be better because it is only 15 percent gas.

[oab_au]

Originally Posted by 92snowmachine

you can raise the idle by adjusting the idle stop, it's a small screw on the passenger side of the throttle body, you can also adjust your tps to raise the idle. i would recommend actually fixing the car because if it is running too rich then that extra fuel is going to destroy your converters. if you just want to make it pass then try creating a small vacuum leak to lean it out, just unplug a small vacuum line, you can also put e85 in and the emissions will be better because it is only 15 percent gas.

I would not alter that screw. It is set to allow the throttle plates to close fully, but not touch the body. If you do alter it to change the idle speed, the ECU will adjust the Idle Air Valve down, to maintain the normal speed.

I agree that you need to fix the problem that is causing the rich mixture.

Harvey.

[Dominus]

Originally Posted by 92snowmachine

you can raise the idle by adjusting the idle stop, it's a small screw on the passenger side of the throttle body, you can also adjust your tps to raise the idle. i would recommend actually fixing the car because if it is running too rich then that extra fuel is going to destroy your converters. if you just want to make it pass then try creating a small vacuum leak to lean it out, just unplug a small vacuum line, you can also put e85 in and the emissions will be better because it is only 15 percent gas.

Where do you get e85 and what do you do with it? Do you put it in with the regular gas to dilute it?

[Dominus]

If I were to undo one of the vacuum lines, which one would it be? I mean, don't they need to be connected? And might the inspector just reconnect it?

[92snowmachine]

i don't know about where you live but around here you can buy e85 at almost any gas station. you really don't want to run it all the time unless you modify your car to do so but for emissions reasons you can run your car until almost empty put in a couple gallons and get it tested. if you can't buy it locally add some "Heat" gas dryer, it's alcohol and will increase the amount in your gas (which reduces emissions). as far as the vacuum line if you are going to try that route then try to find one that is not in an obvious place and either barely disconnect it or put a small hole in it depending how hard the emissions tech will look. keep in mind that these are not the ideal thing to do but are really cheap ways to cheat the test.

[Dominus]

I got that Heet stuff and put it in. Unfortuantely when I went to get it inspected the guy was out sick. So I'm going to try tomorrow.

I was just thinking, what would be better? High octane gas or low octane gas for this situation. It seems that whatever burnt the best would be the way to go. Does high octane burn better? I know it produces more power, but not whether it actually lights better.