I swapped out my Bosch (Bad Oxygen Sensor Costs Horsepower) sensor for a Delco AFS 74. Wow, what a difference. It smoothed out the idle a lot, gave me an 1 inHg more idle vacuum, and eliminated an off-idle stumble that I've been battling for the longest time. There's also a noticeable part-throttle acceleration improvement (when below PE threshold). And it only cost me about $40 to the door from GM parts direct. The dang Bosch sensor costs about $65 from Autozone! Anyway, I'm going to do a mileage check later to see any improvement there too. :lala:

Do you have a GM part number for that sensor? Is it a 3 wire sensor?

Well I'm just shocked
I've only been saying the Bosch O2s are junk for hmm, it's about 4 years now.....

Please give us a part number and wire count on this little wonder.

Who are you?

And I've been saying that about their spark plugs for about just as long. Maybe they rank right down there with Allied Signal for replacement parts quality, huh? (That would include Autolite, Fram, and all the rest of their holdings.)

Too bad about Bosch, since they used to be the OEM supplier for GM sensors, injectors, MAFs, etc.

SNORK!!!

:hail:

The Bosch LSU4.2 is still a decent sensor right? Just the NB sensors are crap?

The only time any plug works better then an AC or Autolite, is if there's an ignition problem. And while the problem may still exist, the softer erosion rates of the electrode material mask the problem, and then it can be an intermittent miss (or worse) at WOT.

Yes,
and
Yes.

I bought a acdelco 3 wire sensor part number #: 25312179 a few mounths ago. This is the one i want right?

I believe that's the one. The number I ordered to was AFS-74.

I was able to found that the GM part number for the ACDelco part AFS-74 is in fact 25312179.

I found a list of cars that this sensor came on off the web so I am not sure of it's accuracy but could be useful:
1995 CHEVROLET S10 PICKUP V6 4.3L 262cid GAS FI N Engine VIN = Z
1995 GMC SONOMA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET ASTRO V6 4.3L 262cid GAS FI N Engine VIN = W
1994 CHEVROLET ASTRO V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET BLAZER V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET C1500 PICKUP V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET C1500 PICKUP V8 5.0L 305cid GAS FI N Engine VIN = H
1994 CHEVROLET C1500 PICKUP V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET C1500 SUBURBAN V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET C2500 PICKUP V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET C2500 PICKUP V8 5.0L 305cid GAS FI N Engine VIN = H
1994 CHEVROLET C2500 PICKUP V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET C2500 SUBURBAN V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET G10 VAN V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET G20 VAN SPORTVAN V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET G20 VAN V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET G30 VAN V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET K1500 PICKUP V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET K1500 PICKUP V8 5.0L 305cid GAS FI N Engine VIN = H
1994 CHEVROLET K1500 PICKUP V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET K1500 SUBURBAN V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET K2500 PICKUP V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET K2500 PICKUP V8 5.0L 305cid GAS FI N Engine VIN = H
1994 CHEVROLET K2500 PICKUP V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET K2500 SUBURBAN V8 5.7L 350cid GAS FI N Engine VIN = K
1994 CHEVROLET P30 VAN V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET S10 BLAZER V6 4.3L 262cid GAS FI N Engine VIN = W
1994 CHEVROLET S10 BLAZER V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 CHEVROLET S10 PICKUP V6 4.3L 262cid GAS FI N Engine VIN = W
1994 CHEVROLET S10 PICKUP V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC C1500 PICKUP SIERRA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC C1500 PICKUP SIERRA XC V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC C1500 PICKUP SIERRA V8 5.0L 305cid GAS FI N Engine VIN = H
1994 GMC C1500 PICKUP SIERRA XC V8 5.0L 305cid GAS FI N Engine VIN = H
1994 GMC C1500 PICKUP SIERRA V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC C1500 PICKUP SIERRA XC V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC C1500 SUBURBAN V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC C2500 PICKUP SIERRA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC C2500 PICKUP SIERRA V8 5.0L 305cid GAS FI N Engine VIN = H
1994 GMC C2500 PICKUP SIERRA XC V8 5.0L 305cid GAS FI N Engine VIN = H
1994 GMC C2500 PICKUP SIERRA V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC C2500 PICKUP SIERRA XC V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC C2500 SUBURBAN V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC G15/G1500 VAN VANDURA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC G25/G2500 VAN RALLY V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC G25/G2500 VAN VANDURA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC G25/G2500 VAN V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC G35/G3500 VAN VANDURA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC G35/G3500 VAN V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC K1500 PICKUP SIERRA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC K1500 PICKUP SIERRA XC V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC K1500 PICKUP SIERRA V8 5.0L 305cid GAS FI N Engine VIN = H
1994 GMC K1500 PICKUP SIERRA XC V8 5.0L 305cid GAS FI N Engine VIN = H
1994 GMC K1500 PICKUP SIERRA V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC K1500 PICKUP SIERRA XC V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC K1500 SUBURBAN V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC K2500 PICKUP SIERRA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC K2500 PICKUP SIERRA V8 5.0L 305cid GAS FI N Engine VIN = H
1994 GMC K2500 PICKUP SIERRA XC V8 5.0L 305cid GAS FI N Engine VIN = H
1994 GMC K2500 PICKUP SIERRA V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC K2500 PICKUP SIERRA XC V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC K2500 SUBURBAN V8 5.7L 350cid GAS FI N Engine VIN = K
1994 GMC P35/P3500 VAN V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC S15 JIMMY V6 4.3L 262cid GAS FI N Engine VIN = W
1994 GMC S15 JIMMY V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC SAFARI XT V6 4.3L 262cid GAS FI N Engine VIN = W
1994 GMC SAFARI V6 4.3L 262cid GAS FI N Engine VIN = W
1994 GMC SAFARI XT V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC SAFARI V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC SONOMA V6 4.3L 262cid GAS FI N Engine VIN = W
1994 GMC SONOMA V6 4.3L 262cid GAS FI N Engine VIN = Z
1994 GMC YUKON V8 5.7L 350cid GAS FI N Engine VIN = K

Should have come on the LT5 ZR1 Vette's too right?

Looks like a different part number for the LT5 (it uses 2) and there is a first and a second design meaning they changed something about it.

this is a heated 3-wire sensor . . . found the answer I was looking for here

http://www.thirdgen.org/techbb2/show...=wire+heatedo2

I know I've seen the part number for the pigtail that connects to that sensor posted before but was unable to find it by searching and would like to order that the same time as the sensor if someone knows the part number. Also where is a good source to get the Bosch LSU4.2 WB sensor? BTW never trust the sensor safe adhesives

Thanks

Got to Carquest. They have or can get you all of the components for Weatherpak connectors. You can build your own pigtail much cheaper than GM

I have a one wire boch o2 on my 91 RS, I would like to switch to a Delco. Do they make a 1 wire version?

Yep, sure do, but I believe you have to go to a dealer to get it.

Turbo city sells a heated o2 sensor kit, supposedly with everything you need for 89 bucks, not sure if its a boch or delco sensor or not.

http://www.turbocity.com/product_inf...products_id=72
turbo city part# 975-566

ok, thanks but apparently that wouldn't be heated, and I have headers and getting open, to closed loop switching kind of behavior so I guess I better switch to heated 02.

Your right, it sounds like you need the heated O2 sensor (that's what I did).

You can get the AFS-74 heated sensor (part numbers shown above) and wire it in yourself cheaper than the $89 turbo city kit (which is an unknown brand of O2 sensor). That's what I did as well. If you want a plug into the harness sensor, you can either get a connector from Pep Boys and splice it into the harness (also what I did), or just cut the connectors off the O2 sensor and harness and use any 3 wire connector of your choice (or a 4 wire and leave one empty - a buddy of mine used 4 wire trailer wiring connectors for his setup).

I'd avoid them. They got me for $50, for a chip they screwed up.

they sell some good stuff, like centered adapter plates to put our tbi's on carb intake, adapters to adapt 454 and Holley throttle bodies to our different TPS,IAC connectors without having to butcher up your harness, and more good stuff tailored to our specific application. I emailed him asking him if the actual o2 sensor in his 'kit' was a boch or a delco, it also implies you get the pigtail in the kit. If it is the delco and has the pigtail its not a bad deal.
Ok he replied here is my question to him and his answer

Q)
In regards to part # 975-566 the heated 02 sensor kit. I was wondering if that is a boch, or delco 02 sensor. I have heard nothing but bad things about boch

A) We use Delco parts in our kits.



delco o2, the pigtail, extra wires, instructions all for that price aint bad really. I'm trying to verify it has the weatherpack pigtail in the 'kit'.

If it is a Delco and has the pigtail, then that is not a bad deal at all....

Yep, I got a reply from him(very prompt responses to I might add)
It does include a weatherpack pigtail.