thook

It's pre-cat. But, when you say it has piece of exhaust welded to it, do you mean the sensor is atleast inline with the exhaust system? Is it sealed within the system? Though, it sounds like an odd modification to me, if it works it works. If it wasn't working, it seems to me you'd be getting a CEL. Anyway......

The sensor is right near the tranny cross member on my '92 V6. Not sure where it should be on your 4cyl. My '86 4cyl. has it right on top of the exhaust manifold. I bet DeathCougar could answer. Or, atleast anyone with the same model vehicle.

BTW, 1k RPM for an idle at operating temp is too high. Should be around 750-800. You might look under the hood for a sticker that would tell exactly. That is if the sticker is still there.

Someone suggested valves earlier. That is actually a valid point. Though it may be idling okay, if any valves are too closed, it could be choking power under load.

shawns88

the o2 sensor is completly off the exhaust, the kid just cut the pipe out were the sensor was and threw it over the frame. so its all strait piped.

but if the valves were off wouldnt there be a ticking noise in the motor?? because there is no noise.

im going to check the timing later today since its no raining.

Seanwain

Looks like you found the problem!

shawns88

the o2 sensor? or timing?

yayfortrees

How did it run since the exhaust was put on, i.e. no O2 sensor? If it has been low on power since then, then you know it needs to be there.

If it had good power without the O2 sensor hooked up, but not since the head gasket replacement, you know you need to be looking at timing, etc.

And if you don't hear any noise coming from the valvetrain, that might mean you have some tight valves. These things usually tick even when they are 'in spec'. LOL On that note, they might also be just right, that is they are adjusted a little tighter than spec to quiet them down, but not too tight to cause harm.

I'm anxious to hear how this turns out.

Lumpy

I'd go with timing and or vac leak...you should be throwing codes if the 02 sensor is not working properly. Have you check for codes? You do need to regap the valves after a HG change.

shawns88

i bought it off a kid and i knew it was going to need a head gasket, drove it one day and it finaly blew out. and also the sensor was out wen i got it.

shawns88

just relized the check engine light doesnt work......

Seanwain

For a fuel injected motor to work properly you have to have an o2 sensor without it the ECU does not fully know what is going on and will adjust timing and air/fuel mixture constantly to try and correct the miss readings. It is imperative that you get the o2 sensor hooked back into the exhaust system. The truck will never run right without it!

shawns88

ok, so how would i put it back in?? drill a hole in the pipe and put it and get some jbweld so it stays in there? or any better ideas?

Seanwain

You need an o2 mount something like this if you do some searching you might find one cheaper. Also you might be able to cut a 6" section where the o2 mount is out of the exhaust on a junk yard truck and weld it into your exhaust system. (o2 sensor mounts before the cat)

http://www.berktechnology.com/shop/p...D=160&P_ID=457

weld on the mount drill your hole and mount the o2 sensor.

Seanwain

Your local exhaust shop might have a mount for the o2

shawns88

i will post pics of the o2 sensor, wen i get home.

shawns88

here is a pick of the o2 sensor, it looks like it has ben apoxid on there.

desertcox05

epoxy

Seanwain

Should look something like this and if you have been driving around with the o2 sensor (tip) exposed to the elements i.e. mud, snow, water road grime dangling under the truck you might want to replace it.

shawns88

my truck has nothing like in that pick, that an yours is newer than mine. my o2 sensor line goes in under the cab and under the carpet.

thook

(Just noticed all the new posting, so scrap original post here)

Under the carpet?????!!! Okay.......

You need to get a mount or have someone at a muffler shop fab something. Epoxy (as much as I love using it for a number of things) won't hold under all the contraction and expansion. JB Weld might. But, I've never used it for something like that. The sensor takes an awful lot of stress from vibration and what not. BTW, have you looked under the hood on the exhaust manifold for a sensor mount?

As for valves, you just can't rely on the sound they make to know whether they're in adjustment or not. If they've not be checked since you've had it or by the PO that you know of, it's just a good thing to do. Run a forum search on 22re valve adjustment. Plenty of instruction on it with tips.

shawns88

ok i will do that, im going to check the time wen i get home today. hopefully its just the timing.

Lumpy

Your truck used to look like that...when they redid the exhaust they just cut the O2 sensor out.