Have a code p1676 on my 98 SE. It comes on for a few days and goes off for a few days. I cannot find very much information on this specific code. What I have found is it indicates driver 4, line 6...whatever that suppose to mean. Also something to do with the fuel system. I really want to turn this SES light off.

This is all I have on that code. https://www.gmforum.com/showthread.p...96#post1391429

Where is the evap purge valve? Is that the likely problem? Is there a certain wire coming out of the computer I could clip to turn off the ses light rather than take the dash apart?

Should be on the front side of the engine, right near the coils.

is there a way to test it?

to the top

Other then unplugging it and inspecting the plug, not that I know of. I checked and autozone sells them for about $24. Worth picking one up and trying it. If no change, return it.

I checked it out and the plug was nice and clean. The vacuum lines looked good. Is this valve most likely the problem? I hate throwing parts at a car, plus autozone doesnt like to return electrical parts. Is there anyway to test this? How come the light will stay on for a few days and then go off for a few days?

I've not had a chance to look in to testing that part, sorry. The SES lights come on when there are a set number of starts or problems. And can go off again after a few starts with no problems.

Does your purge valve solenoid look like this?

First thing to try is pull the purge valve solenoid off and make sure the coil is not shorted. Should read something around 28 ohms across the two pins in solenoid.
Then put a piece of vacuum hose on one of the vacuum fittings and see if you can blow air through it.

With 12 volts applied to the solenoid the valve will open and you will be able to blow air through the vacuum fittings. Remove 12 volts and the valve should close and be airtight.

When the vacuum lines in the purge system get rotten small particles of dirt and rubber are being sucked into the purge valve solenoid blocking it open or clogging it. Sometimes a charcoaled canister can go bad and leak charcoal into the system.
Apply 12 volts to the solenoid and blow air through the vacuum fittings blowing out any dirt and rubber dust.