Thread: 98 GP GT with a PO442 code and light on.

My "new to me" Grand Prix has a SES light on most of the time. Sometime it goes off and I have a code reader and have cleared it a couple of times but it comes back on. Any ideas what this might be. It says Evap Emissions Control Small leak or something like that. I was going to pickup a new gas cap at lunch today but I doubt that is what's wrong. I did some searches on the web and got some hits for other gm cars and things were mentioned like canistier leak and vac leak. I'll try to check out as much of that as I can.
Thanks so much for everyone's help. I can do most stuff myself on my car but sometimes need a little guidence!
Rob

just an FYI... if your car has the tethered cap, and you want to keep that, you have to go back to the dealer... who'da thunk that GM had a patent on a gas cap tether???

Originally Posted by SyntheticShield

You're kidding me right?

abso-friggen-lutely not


new gas cap w/teather from the dealer for my regal was $25 bucks

Fuel cap tether apparatus - US Patent 5462190

Thanks guys, I have been traveling for my job and just got back. I have a rolled 98 Montana so I will take the cap off of it tonight and see if that helps. I would think it would be the same.
Rob

my gp has the po442 code and is leaking coolant very slowly from the right side of my intake manifold by the throttle body. i am already planning on replacing the gasket and manifold but just wondering if this could be why the codes on. ive hear the code could be be a "vacuum leak at engine". would this be considered a "vacuum leak"?