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Username Post: Convert 95 k1500 to true dual with single O2 sens.        (Topic#139261)
HiTekRedneck 
Member
Posts: 32
HiTekRedneck
Loc: KY, USA
Reg: 08-30-06
08-30-06 05:13 PM - Post#994298    

Hi all! I have a 95 K1500 Z-71 and just purchased and installed a set of Hedman Full Length Headers. My truck has a 6" suspension and 3" body lift so I had plenty of room and a nice fit. I am headed to the exhaust shop in the next day or so to get the rest of the exhaust done. I'm definately running catless. I would like to run true duals but I only have one O2 sensor. My thinking is only reading the exhaust gases from the passenger side 4 cylinders instead of all 8 will screw with my ECM and throw my rich/lean conditions off. Can I add another O2 sensor? Or is there a resistor or something I can replace it with that won't cause poor performance? Any or help or ideas would be greatly appreciated! My backup plan is a y pipe with 3" single exhaust. Thanks for any help!
HiTekRedneck

CAN'T CAN'T DO ANYTHING! CAN GITS R' DONE!

03 2500HD 6.6 Duramax w/ Banks 6 Gun, 6" Skyjacker

95 K1500 Z-71 5.7 350, 6" SkyJacker, 3" body lift

95 Suburban LT K1500 5.7 350



 
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camaro865 
Very Senior Member
Posts: 1192
camaro865
Loc: Massachusetts
Reg: 10-13-03
Re: Convert 95 k1500 to true dual with single O2 s
08-30-06 05:19 PM - Post#994299    
    In response to HiTekRedneck

you and i both probably agree that it would be ideal to have the o2 sensor downstream from all 8 cylinders right?

correct me if i'm wrong, but on a 95, the o2 is on the drivers side ONLY....if there was a problem with that then i'm sure the designers at gm would have cautht it.

i wouldent worry 'bout it....just run stock sensors and you should be fine.
03 silverado 1500 HD 6.0 4 door crew cab 4x4


 
HiTekRedneck 
Member
Posts: 32
HiTekRedneck
Loc: KY, USA
Reg: 08-30-06
Re: Convert 95 k1500 to true dual with single O2 s
08-30-06 08:27 PM - Post#994300    
    In response to camaro865

Thanks for the reply. Your correct in that there is only one sensor, but it is located on the passenger in the Y pipe just before the cat. Thats where it was on my truck.
HiTekRedneck

CAN'T CAN'T DO ANYTHING! CAN GITS R' DONE!

03 2500HD 6.6 Duramax w/ Banks 6 Gun, 6" Skyjacker

95 K1500 Z-71 5.7 350, 6" SkyJacker, 3" body lift

95 Suburban LT K1500 5.7 350



 
Phazer 
Valued Contributor
Posts: 3004
Phazer
Loc: Armpit of the Universe
Reg: 10-10-03
Re: Convert 95 k1500 to true dual with single O2 sens.
08-30-06 08:40 PM - Post#994301    
    In response to HiTekRedneck

Put an "H" pipe in. It will help performance and you can have a bung welded in there for your O2. Don't cut the O2 wire itself to extend it, cut the wire going to it.
My "To Do List" for this weekend:
Nothing but womens names...
and drugs....

92 Bravada
96 Sunfire
00 Impala
05 Stratus
90 Wrangler
77 Cub Lo-boy
87 Intruder VS700
95 Intruder VS1400


 
HiTekRedneck 
Member
Posts: 32
HiTekRedneck
Loc: KY, USA
Reg: 08-30-06
Re: Convert 95 k1500 to true dual with single O2 sens.
08-31-06 03:09 AM - Post#994302    
    In response to Phazer

I'm scheduled for Tuesday to get this exhaust done. The guy at the shop said I could plug in an o2 simulator available from summit racing. I called them and the manufacturer no longer makes them. The only ones I can find on the internet are for OBDII vehicles. Anyone know where I can get one for my OBDI truck (pre 1996). I appreciate the help. Keep the ideas coming. Thanks!
HiTekRedneck

CAN'T CAN'T DO ANYTHING! CAN GITS R' DONE!

03 2500HD 6.6 Duramax w/ Banks 6 Gun, 6" Skyjacker

95 K1500 Z-71 5.7 350, 6" SkyJacker, 3" body lift

95 Suburban LT K1500 5.7 350



 
camaro865 
Very Senior Member
Posts: 1192
camaro865
Loc: Massachusetts
Reg: 10-13-03
Re: Convert 95 k1500 to true dual with single O2 s
08-31-06 04:00 AM - Post#994303    
    In response to HiTekRedneck

you should re-think getting your truck done at that shop becasue that guy knows nothing.

an 02 simulator is what people sometimes put in the o2 downstream of the CAT. the o2 downstream of the cat does not adjust the fuel mixture, all it does is tell the computer if the cat is working....and this is only on '96+ trucks.

you NEED your oxygen sensor.
03 silverado 1500 HD 6.0 4 door crew cab 4x4


 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
Re: Convert 95 k1500 to true dual with single O2 s
08-31-06 04:18 AM - Post#994304    
    In response to camaro865

Make sure that you use a 3 wire heated O2 sensor, install it in the header collector and all will be good.

http://sethirdgen.org/HO2S.htm


Low restriction exhaust will typically start setting EGR codes though.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
Lowgear 
Senior Member
Posts: 310
Lowgear
Loc: New England
Reg: 01-19-05
Re: Convert 95 k1500 to true dual with single O2 s
08-31-06 04:50 AM - Post#994305    
    In response to 1983G20Van

http://www.chevytalk.org/threads/showfla...rue#Post1590149
custom 93 c1500
blown 68 camaro


 
BigChevy80 
Senior Member
Posts: 598
BigChevy80
Age: 31
Loc: Gridley, IL
Reg: 12-04-03
Re: Convert 95 k1500 to true dual with single O2 sens.
08-31-06 03:12 PM - Post#994306    
    In response to HiTekRedneck

Just put the o2 sensor in one of the header collectors. It will not make any difference. The '87-'94 chevy trucks had the o2 sensor in one of the manifolds reading only 4 cylinders.
Tony

1991 Chevrolet C1500
1998 Ford Explorer

"Natural Gas Vern! Kinda like your first wife: hot, fast and cheap!" --Ernest P. Worrell


 
Lowgear 
Senior Member
Posts: 310
Lowgear
Loc: New England
Reg: 01-19-05
Re: Convert 95 k1500 to true dual with single O2 s
08-31-06 04:59 PM - Post#994307    
    In response to BigChevy80

Whats the advantage of using one from a 1994 Chevy Astro 4.3 V6 (3 wire sensor)like 1983G20Van said?
custom 93 c1500
blown 68 camaro


 
HiTekRedneck 
Member
Posts: 32
HiTekRedneck
Loc: KY, USA
Reg: 08-30-06
Re: Convert 95 k1500 to true dual with single O2 s
09-03-06 11:30 PM - Post#994308    
    In response to Lowgear

Thanks for all the help! Very much appreciated. I am going to keep an o2 sensor. I like the idea of using the heated o2 sensor so I'm going to do that. Is 1983G20VAN saying that using an o2 from a 1994 Chevy Astro 4.3 V6 (3 wire) is heated? Correct me if I'm wrong, but I'm assuming buying that sensor is more affordable than looking for a specialty heated sensor. Thanks again!
HiTekRedneck

CAN'T CAN'T DO ANYTHING! CAN GITS R' DONE!

03 2500HD 6.6 Duramax w/ Banks 6 Gun, 6" Skyjacker

95 K1500 Z-71 5.7 350, 6" SkyJacker, 3" body lift

95 Suburban LT K1500 5.7 350



 
Kazz 
Senior Member
Posts: 233

Loc: Montana
Reg: 05-03-03
Re: Convert 95 k1500 to true dual with single O2 s
09-04-06 03:06 AM - Post#994309    
    In response to HiTekRedneck

Quote:

Whats the advantage of using one from a 1994 Chevy Astro 4.3 V6 (3 wire sensor)like 1983G20Van said?





When you use a high flowing exhaust system, the gases aren't as hot because of less restriction in the system. The O2 sensor needs heat to operate properly. If the sensor doesn't heat up to the proper temp, the fuel mixture will never be right. The heated sensor will make sure it will get to that proper operating temp.

Kazz
04 Chevy Tahoe
92 Chevy Ext Cab 4X4
95 Chevy Ext Cab 4X4 (RIP)

Money can't buy you love
But it sure can buy you a really good time!


 
HiTekRedneck 
Member
Posts: 32
HiTekRedneck
Loc: KY, USA
Reg: 08-30-06
Re: Convert 95 k1500 to true dual with single O2 s
09-09-06 02:44 AM - Post#994310    
    In response to Kazz

Thanks for all the help from everyone. I am oficially running Hedman full length headers with true dual 3" pipes, no cats, to 2 flowmaster 40 series mufflers straight out the back. It sounds like a racecar. It is extremely loud and I don't think it will be long before I have a run in with the law. I put in the heated o2 sensor. The only issue I have now other than ducking "john law" is an intermittent Code 32 for the EGR valve. I gotta do a forum search and see if I can find a fix for it. Thanks again for all you help.
HiTekRedneck

CAN'T CAN'T DO ANYTHING! CAN GITS R' DONE!

03 2500HD 6.6 Duramax w/ Banks 6 Gun, 6" Skyjacker

95 K1500 Z-71 5.7 350, 6" SkyJacker, 3" body lift

95 Suburban LT K1500 5.7 350



 
BigChevy80 
Senior Member
Posts: 598
BigChevy80
Age: 31
Loc: Gridley, IL
Reg: 12-04-03
Re: Convert 95 k1500 to true dual with single O2 s
09-09-06 06:46 AM - Post#994311    
    In response to HiTekRedneck

3" duals is way overkill unless you have some super high horsepower mods. On a stock smallblock 2.5" duals is more than enough. I've even had a couple with 2.25" duals that were breathing easy.

You will probably loose some low end torque since there will not be very much backpressure in that system. May even burn some exhaust valves out over a period of time.

just my 2 cents
Tony

1991 Chevrolet C1500
1998 Ford Explorer

"Natural Gas Vern! Kinda like your first wife: hot, fast and cheap!" --Ernest P. Worrell


 
HiTekRedneck 
Member
Posts: 32
HiTekRedneck
Loc: KY, USA
Reg: 08-30-06
Re: Convert 95 k1500 to true dual with single O2 s
09-09-06 09:13 PM - Post#994312    
    In response to BigChevy80

I agree, that I might have gotten carried away. I thought it was good to shoot for as free flowing as possible. I picked up a ton of low end torque after the install. Other than the headers and a K&N filter the motor is bone stock with 180,00 miles on it. Before the exhaust mod my truck couldn't even come close to breaking my 33's loose. Now the she squats and will spin some rubber. The only problem so far is my EGR (code 32) is tripping intermittently. I'm currently trying to figure out what I can do for it without eating my expense and going to smaller pipes. The EGR code isn't effecting drivability that I can feel, but I'm sure it's not going to my gas mileage any justice.
HiTekRedneck

CAN'T CAN'T DO ANYTHING! CAN GITS R' DONE!

03 2500HD 6.6 Duramax w/ Banks 6 Gun, 6" Skyjacker

95 K1500 Z-71 5.7 350, 6" SkyJacker, 3" body lift

95 Suburban LT K1500 5.7 350



 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
Re: Convert 95 k1500 to true dual with single O2 s
09-10-06 04:04 AM - Post#994313    
    In response to HiTekRedneck

Dual 3" exhaust is not overkill for even a stock 305 TBI engine. I picked up power all throughout the powerband on my little 305. 1 7/8" x 3.5" camaro headers, 3" X-pipe, 3" dual highflow cats, dual 3" flowmaster 50 series Delta flows, dual 3" pipes. Back pressure to make torque is a MYTH, atleast on a smallblock. Less is better, you just want to keep the velocity up. My initial setup was 1.5" x 3" headers and 2 i/4" pipes, really didn't run any better up top than the stock cast iron manifolds did. I could fry both tires (P255/70/R15) with 3.08 gears and the stock 1,800 rpm converter, keep in mind this is a 5,300 lbs Van.

As far as the EGR code, get an aftermarket EGR valve from Autozone. Have them cross your OEM number to theirs. The new EGR valve will come with a variety of washers, and a sheet of paper showing which one is needed for which OEM part number. Find the one that suits your valve and measure the inner diameter. Now find one in the bag that is about .025" bigger, put it into the valve, put the valve on. The EGR code should dissappear, If not you have plenty more to experiment with. Reducing back pressure reduces flow through the valve, which needs to be restablished with a bigger orifice opening.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
HiTekRedneck 
Member
Posts: 32
HiTekRedneck
Loc: KY, USA
Reg: 08-30-06
Re: Convert 95 k1500 to true dual with single O2 s
09-14-06 04:00 PM - Post#994314    
    In response to 1983G20Van

Sorry for the late reply. Thanks for the info G20. Really appreciate it! I feel better about my expense now. I'm going to pick up a new EGR and open it up a bit. The light is intermittent at the moment so I don't think it will take much. I have a header leak on the o2 side that I'm going to address before the EGR. I received crappy paper gaskets with my hedders and installed them against my better judgement. I got some good steel gaskets on the way along with locking header bolts. My recommendation to anyone following this thread and considering hedders is "get good bolts and gaskets so you don't have to redo them." I'm very happy with the Hedman Hedders but the gaskets and hardware included suck. Now you guys know how I'm spending my weekend. LOL! I'll let ya know how the new gaskets and bolts work out and about my EGR code.
HiTekRedneck

CAN'T CAN'T DO ANYTHING! CAN GITS R' DONE!

03 2500HD 6.6 Duramax w/ Banks 6 Gun, 6" Skyjacker

95 K1500 Z-71 5.7 350, 6" SkyJacker, 3" body lift

95 Suburban LT K1500 5.7 350



 
BBC-454 
Senior Member
Posts: 1400
BBC-454
Loc: Edmonton, Alberta
Reg: 05-11-03
Re: Convert 95 k1500 to true dual with single O2 s
09-15-06 05:15 PM - Post#994315    
    In response to HiTekRedneck

O2 sims are only for 96- OBD2 systems as mentioned. Running a true dual with only the single bank O2 will run fine, as the sensor is upstream of the merge on the factory exhaust anyways.

Also, in my experience, a single 3" system with a good Y pipe flows just as good aas a dual 2.5" system.
Josh R.L.
Licensed Automotive Mechanic
1966 Buick Special 2 door
1961 Chevrolet Apache 10 panel van
1995 GMC K2500
2011 VW Jetta TDI


 
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