Entropy

Sorry it took me so long to respond back to this post. I just want to add to it in case it helps someone else. It turns out it was a missing vacuum line. It goes from (I think) the back of the intake manifold to some fuel-thing which is pretty much right below it. It runs right up against the firewall, so I couldn’t even see the connection points. Once I got a new hose on there, it’s much better. The check engine light still comes on every couple of days, and it’s still the same error code, but it clears itself up after a few minutes. It also never loses power like it did before. I’ll probably take another look at it in the spring when it’s a little nicer outside. Thanks for all the help guys.

Thanks, I picked up a new Timer at Pick and Pull, and it fixed the door locks right up. I'm still having no luck with the loss of power/intermittent Check Engine Light problem though. I'll keep trying, and let you guys know.

Wow, thanks guys for all the suggestions. I cleaned the MAF, and it did seem to help, though the check engine light still comes on/off sometimes (and still shows error code 33); however, now when the light comes on, I don't lose nearly as much power as before. And thanks Alkorahil, I'll check out all those things you suggested this weekend, though one more question. You ask if I was given the right O2 sensor. It sure looked the same, though I've thrown out the old one now. I've read (after I bought my current O2 sensor) that some guys run into problems if they don't use a 'Genuine Nissan' O2 sensor. I just bought mine at Lordco (it was Bosch or NGK). Do you know if there's any truth to this? I don't really want to buy another one (especially at dealership prices), though if you think there's some truth to this, and your other ideas don't help, I'll try that too. Thanks again guys. Maybe I'll finally get this solved this weekend.

Hi guys, I hope you can help me out here, because I can't seem to figure this out. I have a '94 Pathfinder, automatic. A couple months ago, the check engine light came on, though it ran fine, so I wasn't concerned. After a while, it started to lack power, though only rarely. So I checked the codes, and it came back with code "33" - the O2 Sensor. So I bought a new one (Bosch I think) and replaced it. It didn't help at all. The check engine light still comes on (even though I clear the codes). As soon as the light comes on, I have absolutely no engine power. I can put the throttle down to just before it downshifts, and I can't accelerate. Sometimes the engine light will turn back off, and it's all back to normal, though lately the lights seems to be on more than it's off. I checked the catalytic converted (I read if it's plugged it can cause this), but it's clean. As some background (since this may help someone help me), my power door locks started behaving funny. All the doors lock automatically when either of the front doors are closed, just as iff I hit the lock switch. It's an inconvenience, but I don't know if the two issues are related (computer or something?) Plus, last year I had the Knock Sensor replaced because the engine was knocking really bad in the summer heat. Replacing that helped, though I have to run mid-grade gas now if the summer still to prevent pinging. I'm just throwing this bit in incase someone thinks these are related somehow. Any help you guys can give would be really appreciated. Thanks.