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Old 11-03-2018   #1
ZWILD1
 
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Default 02 Sensor and spark plug?

My 91 had both 02 sensors reading rich. I talked with Marc Haibeck and he said I could replace the sensors if it bothered me. But I didn't ask him what brand sensors and plugs he used. I figured I would ask you guys which brands you preferred and are running.
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Old 11-03-2018   #2
Flyman 27
 
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Default Re: 02 Sensor and spark plug?

The ones I chose were Bosch. They work well & have not had any issues.
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Old 11-03-2018   #3
XfireZ51
 
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Default Re: 02 Sensor and spark plug?

I use the AC Delcos. The Bosch O2s drop signal randomly. Don’t trust them. The ACs are solid.
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Old 11-03-2018   #4
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Default Re: 02 Sensor and spark plug?

Replacing the right side,I think it’s the right side,is a total nightmare,do plenty of research before you dig in.
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Old 11-03-2018   #5
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Default Re: 02 Sensor and spark plug?

Rock Auto Pt # 21003 Working great in my 90
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[B]1990 #2815[/B]
[COLOR="Red"][B]Red/Red[/B][/COLOR]
Ported Plenum & IH (by Pete)
Haibeck Chip
Rebuilt FPR (by Phil)
FIC Injectors
Watson LT Headers
3" Stainless Works exhaust
Lingenfelter Open Air Lid
Bill B Built Transmission
Shifter & C Beam Plates


[FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT]
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Old 11-03-2018   #6
ZWILD1
 
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Default Re: 02 Sensor and spark plug?

Sounds good I think I will probably go with the AC's. What plugs are you guys running? So many to choose from.
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Old 11-03-2018   #7
Vette73
 
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Default Re: 02 Sensor and spark plug?

Quote:
Originally Posted by XfireZ51 View Post
I use the AC Delcos. The Bosch O2s drop signal randomly. Don’t trust them. The ACs are solid.
X fire, you have the AC delco part number?
Where you buy from?
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Old 11-04-2018   #8
Paul Workman
 
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Default Re: 02 Sensor and spark plug?

Quote:
Originally Posted by XfireZ51 View Post
I use the AC Delcos. The Bosch O2s drop signal randomly. Don’t trust them. The ACs are solid.
Dominic is spot-on RE the 'dropping out' intermittently. Drove me NUTS until I acquired a scanner that would capture data during a particular event.
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90 #1202
"FBI" top end ported & relieved
Cam timing by "Pete the Greek"
Sans secondaries
Chip & dyno tuning by Haibeck Automotive
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Old 11-04-2018   #9
XfireZ51
 
Join Date: May 2007
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Default Re: 02 Sensor and spark plug?

Quote:
Originally Posted by Vette73 View Post
X fire, you have the AC delco part number?
Where you buy from?
Got them from Rock Auto. Don’t have part # but just go down thru the catalog for LT5. Easy to find.

Also, I just installed a set of Autolite 3924 plugs gapped at .044”. These are “projected nose” plugs. The motor runs much smoother than w the NGKs.
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Old 11-04-2018   #10
Paul Workman
 
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Default Re: 02 Sensor and spark plug?

Pete put me onto the (copper) AC Delco 41-602s. They're not exotic, but because of the ease of access on the LT5, there's no need to pay for plugs made of everlasting "rare earth" material. At about $2.00 or so a plug, you can afford to replace them long before they start to show signs of wear (rounded electrode edges, gaps increasing, i.e., the usual burning up indicators.

These plugs I pulled after one season (or was it two?). Practically new condition, and the motor (stock cams) idle purrs like a kitten.
Attached Images
File Type: jpg AC Delco 41-602s with aprox 2800 miles.jpg (245.8 KB, 16 views)
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90 #1202
"FBI" top end ported & relieved
Cam timing by "Pete the Greek"
Sans secondaries
Chip & dyno tuning by Haibeck Automotive
SW headers, X-pipe, MF muffs

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