installing 180 stat, pcv valve, and 02 sensor - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-03-2003, 05:37 PM   #1
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Default installing 180 stat, pcv valve, and 02 sensor

ok, I stopped by napa and picked up a heavy duty 180 t-stat, a PCV valve, and a O2 sensor.

haha, now heres the good part, would anyone wanna help me by giving me some directions on how to do them?
also on the t-stat box it has directions, it says to drain the coolant, is that nessecary? because i just flushed it about a month ago. also there is one screw/bolt one the side and one on top of the thermostat housing do i remove the one on top too?

I have no idea what the PCV valve is,, where it'* at or anything...

on the O2 instructions it says that anti-seize is not required on flange style units, does that mean I need to use it or does my engine have a flange?
-any help or directions will be greatly appreciated, thanx.
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Old 06-03-2003, 07:37 PM   #2
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I think I can help with 2 out of 3...

1) The t-stat is held on by the two bolts on the sides of the housing. You shouldn't need to touch the one on top. I belive that is actually some sort of valve (never played with it myself). I have never draind the coolant, just make sure you do this to a cold engine. I just pull off the hose leading to the housing and some coolant will spill out, but not much. After it is done I let it run, look for leaks, and eventually refill any coolant that was lost if needed.

2) The O2 is really easy. If it is anything like mine you will find it at the top of the down pipe leading to you catalytic converter. Save yourself the time and headache and buy a O2 socket. It looks like a regular socket except it has a cutout on one side for the wireing harness to get out of the way. Just unscrew the old one and screw in the new. Make sure you hook all the wires back up (only 1 connection).

3) Not sure about the PCV valve. Never messed with it on mine.
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Old 06-03-2003, 09:46 PM   #3
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WL, you have a 93 SSEi. Your PCV valve is in the Supercharger. Remove the cover, and as you're facing the engine, look at the top of the SC on the throttle body end, just to the rear (closest to the firewall). You'll see a little black metal plate. Remove it, and the PCV valve is inside. You may need to use small pliers to pull it out, and make sure the seal is in good shape before installing the new one.

For the thermostat, everything that'* been said. You may need to get the fiber gasket for the thermostat housing from the dealer, but you should be able to get the rubber 'rim seal' for the stat at the parts store where you bought the stat. Stuff a rag in the hole or leave the old thermostat in while you clean the old gasket off the lower intake surface. This will keep particles from getting into the block.
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Old 06-04-2003, 01:02 PM   #4
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i went and got a o2 socket today and the f***er costed 15 bucks, do I really need it or would a open end wrench to the trick?
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Old 06-04-2003, 01:49 PM   #5
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Did you get an AC Delco O2 sensor or a Bosch O2 sensor ? Hopefully the AC Delco one
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Old 06-04-2003, 02:13 PM   #6
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I used a wrench. No prob on a cold engine.
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Old 06-04-2003, 08:47 PM   #7
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actually its a Lisle, says it fits most domestics and some imports, but I think I'll just get it with a wrench and the return it back to the parts house. but do I need to use the anti seize????
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Old 06-04-2003, 08:55 PM   #8
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the AC Delco comes with the Anti-Seize gunk on the thread already. Check yours to see if there is any compound on the thread.
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Old 06-04-2003, 09:14 PM   #9
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the o2 sensor i bought is Echlin, will that be a problem or do I need to specifically get an ac dlco o2 sensor????
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Old 06-04-2003, 09:17 PM   #10
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Dunno about that one - I just hear everyone here saying dont get anything but AC Delco for an O2 sensor.
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