GP1138 Posted May 31, 2007 Report Share Posted May 31, 2007 So tonight, I decided I was tired of the car idling like shit, so I tore off the plenum and got ahold of the O2 sensor socket I borrowed, and I used a wobbly extension and a ratchet, and broke it loose, no coaxing, no nothing. So it still idles like ass thanks to the timing being jacked, and it leaks coolant because I didn't tighten the throttle body coolant hose properly. However, it did idle decent when I first started it up. I think it might have a vacuum leak now, I didn't have much time to fuck with it after I put the plenum back on- I'll do that tomorrow. Quote Link to comment Share on other sites More sharing options...
Pontiac6KSTEAWD Posted May 31, 2007 Report Share Posted May 31, 2007 Ok, I am lost here, as I dont know the 3100. But why would you have to take the plenum off to replace the O2 sensor? Quote Link to comment Share on other sites More sharing options...
GP1138 Posted May 31, 2007 Author Report Share Posted May 31, 2007 Ok, I am lost here, as I dont know the 3100. But why would you have to take the plenum off to replace the O2 sensor? BAH, I didn't list the car I did it on - I did it on the Z34 - 3.4DOHC - the plenum is about an inch from the firewall, no room for the wrench. Besides, it's easier with the EGR and all the rest of the shit out of the way. Quote Link to comment Share on other sites More sharing options...
Pontiac6KSTEAWD Posted May 31, 2007 Report Share Posted May 31, 2007 Ahh, ok, that doesnt help much cause I have never, and will never, work on a DOHC LOL.. Quote Link to comment Share on other sites More sharing options...
slick Posted May 31, 2007 Report Share Posted May 31, 2007 You can get the O2 on the 3.4 from the bottom as well. I, personally, had to do mine from the top, as it was, well, welded to the manifold. You probably do have a vacuum leak if it was better for a minute or two. I had constant problems with the small vacuum lines behind the intake plenum always wanting to come undone. Quote Link to comment Share on other sites More sharing options...
GP1138 Posted May 31, 2007 Author Report Share Posted May 31, 2007 You can get the O2 on the 3.4 from the bottom as well. I, personally, had to do mine from the top, as it was, well, welded to the manifold. You probably do have a vacuum leak if it was better for a minute or two. I had constant problems with the small vacuum lines behind the intake plenum always wanting to come undone. Yeah, I'm learning very quickly that I need to find some sort of permanent solution for those. I'm more concerned about where the oil is leaking from now, now that the valve covers have stopped leaking, it's coming from somewhere else. It looks like the oil pan gasket or the oil pressure sender. I like this motor, but hate it at the same time, my arms have countless scrapes from wedging them in between the firewall and rear cam carrier to get the O2 out yesterday. It would have been 100x easier had I had a comealong or ratchet strap last night, as it was, I had to take the motor mount off and rock the entire car just to get the damned O2 socket on the sensor because there was some shield that wouldn't budge that was RIGHT over top of the sensor itself, and I damn near broke the new sensor doing the same thing. I got really lucky on the old sensor, though. It broke loose fairly easily. The car had been driven within the past four hours, though, it was just cool enough to work on, and the threads felt nice and solid when I threaded the new one in. Quote Link to comment Share on other sites More sharing options...
5speedz34 Posted May 31, 2007 Report Share Posted May 31, 2007 When I did the O2 on my sister's car I don't remember if I had the plenum off or just loose. For some reason I remember getting to it with it on? Anyways the best way John is to use a offset O2 socket. I could not get the fullsize socket to work. I had about 3 6" extensions and a u-joint, and I had no problem getting it off. The only problem for me was putting the new one on while trying to get the wires to clear the firewall. If you can I would upgrade to the 94+ vacuum setup it is much better. Quote Link to comment Share on other sites More sharing options...
rockfangd Posted May 31, 2007 Report Share Posted May 31, 2007 whe i did my o2 sensor a few days ago i spent 2.5 hrs of cursing and yelling Worst partwas 4 new mounts and a brand new exhaust made thejob impossible to pullthe engine forward. getting the new one to thread was nearlyimpossible Quote Link to comment Share on other sites More sharing options...
pwmin Posted May 31, 2007 Report Share Posted May 31, 2007 that sux. after doing the C100 swap on shanes monte, the car started and died like the pcm was bad, but it turned out to that he didnt put the brake booster hose on the manifold correctly. i was suprised it would completely not run at all w/ a vacuum leak, but it was a big one. Quote Link to comment Share on other sites More sharing options...
GP1138 Posted May 31, 2007 Author Report Share Posted May 31, 2007 It took some wrangling, but the fullsize socket finally did go on, with a lot of rocking and coaxing. It actually took me around two hours to do, I was very surprised. I still hear hissing from the back of the engine, and I can't figure out where it's coming from. I think I'm going to have to yank the plenum off again. What's different about the '94+ vacuum setup? Does it involve swapping valve covers, etc? Quote Link to comment Share on other sites More sharing options...
GP1138 Posted May 31, 2007 Author Report Share Posted May 31, 2007 he didnt put the brake booster hose on the manifold correctly LOL - I got EVERYTHING battened down and reconnected, and to be thorough I did a check of what I had disconnected, and realized that I'd completely forgotten to reconnect that brake booster hose to the manifold, and I figured out it's almost completely impossible to reconnect with the plenum fully tightened down. I had to remove the EGR valve and thanks to my small hands I was able to push it back on. Quote Link to comment Share on other sites More sharing options...
pwmin Posted May 31, 2007 Report Share Posted May 31, 2007 he didnt put the brake booster hose on the manifold correctly LOL - I got EVERYTHING battened down and reconnected, and to be thorough I did a check of what I had disconnected, and realized that I'd completely forgotten to reconnect that brake booster hose to the manifold, and I figured out it's almost completely impossible to reconnect with the plenum fully tightened down. I had to remove the EGR valve and thanks to my small hands I was able to push it back on. ROFL. yeah, we removed the dogbone and ratched it forward and were able to get it back on, too, but it was a little easier being a 95 engine and it had an mandsproduction hose (of course). dumbass didnt push it on the whole way Quote Link to comment Share on other sites More sharing options...
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