91 s-10 with vortec 350
11-16-2012, 10:36 PM
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91 s-10 with vortec 350 I just got a 91 s-10 with 96 Vortec 350. The guy I got it from said motor is not stock plus it has a big cam and it is fouling plugs left and right. So I was wondering what I would have to do to swap to carb and it has the 700r4 trannY But I want all of my gauges and other stuff that is ran by the computer to work if that's possible.
11-17-2012, 10:14 AM
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11-17-2012, 10:49 AM
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11-17-2012, 06:37 PM
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It is 91 s-10 with the 96 Vortec 350 tb motor.I guess the computer don't like the cam so it burns real rich and fouls plugs all the time. So what would I have to do to run a carb andstill keep gauges and lights and wipers and everything else to work with computer and just get rid of sensors on tb and o2 if that is possible?
11-17-2012, 11:21 PM
#7
Is it a TPI motor? What is being used to control timing and fuel? Keep the wideband O2 if it has it as that will help you tune the carbed motor.
It would be more pain than it is worth to try to convert it to an HEI dizzy setup in a 91 S10. You would have to pull the motor and get out your big boy hammer to make room for the distributor, distributor cap, and wires without rubbing. This would require modifying the body or moving your motor mounts forward 1.5" which would require you to possibly relocate your radiator and radiator mounts depending on how much thought was put into the original swap, relocating trans cross member, convert to electric fans if you dont already have them due to decreased clearance after accessories, and need a new driveshaft.
It would be more pain than it is worth to try to convert it to an HEI dizzy setup in a 91 S10. You would have to pull the motor and get out your big boy hammer to make room for the distributor, distributor cap, and wires without rubbing. This would require modifying the body or moving your motor mounts forward 1.5" which would require you to possibly relocate your radiator and radiator mounts depending on how much thought was put into the original swap, relocating trans cross member, convert to electric fans if you dont already have them due to decreased clearance after accessories, and need a new driveshaft.
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11-18-2012, 10:38 AM
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It is tbi vortec. It is one wire o2 sensors. So if I keep o2 and distributor then I would have to keep computer so how would I get rid of all the map sensors and tb sensors to keep computer? So with 700r4 do I need to rig up tps?
11-18-2012, 02:08 PM
#9
The O2 sensor is needed in order to allow the ECM to go into closed loop operation.
You will need a chip burned for the ECM to allow for that cam to be run.
Trans-adapt makes an adapter for TBI intakes to allow you to run a carb on top if you cannot find an intake to run a dedicated carb setup. The computer will re-set the timing if you jack it up too high on these vortec's. As you can probably guess this platform is fine for stock or mild build applications but is not optimal for strict performance. Also do not forget about EGR as the computer will pull timing if this is overlooked, which can cause it to throw codes like too rich or too lean.
edit: http://www.tbichips.com/custom.htm
You will need a chip burned for the ECM to allow for that cam to be run.
Trans-adapt makes an adapter for TBI intakes to allow you to run a carb on top if you cannot find an intake to run a dedicated carb setup. The computer will re-set the timing if you jack it up too high on these vortec's. As you can probably guess this platform is fine for stock or mild build applications but is not optimal for strict performance. Also do not forget about EGR as the computer will pull timing if this is overlooked, which can cause it to throw codes like too rich or too lean.
edit: http://www.tbichips.com/custom.htm
Last edited by SS10Tech; 11-18-2012 at 02:14 PM.
11-18-2012, 07:11 PM
#11
The single wire o2's have me confused as the vortec engines use 3 wire I believe.
If your dead set on carbing it, you will need a carb intake for vortec heads, distributer, and a box from tci to run the lock up converter on the 700.
11-18-2012, 07:52 PM
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Honestly. I'm trying to figure it out to the guy said it is 96 motor and computer but the tb looks like the 93 tb injection and intake. Idk if the vortec had plastic intake in 96,and it has a seperate coil beside the distributor. So Idk what kind of set up iit is I would like to stay throttle body but I afraid it will be to hard to figure everything out so carb might be the best way to go and or should I try and figure everything and keep it?
11-18-2012, 09:30 PM
#13
96 was the first year for the vortec engine with obd2. If it has a plastic upper intake, it's a vortec injection system and I'd do everything I could to keep it. Esp if its running, even poorly.
To check to see if the rest of the engine is vortec, look at the timing cover, it will be plastic as well with a crank sensor directly behind the balancer on the passengers side bottom, sticking out of the timing cover.
To check to see if the rest of the engine is vortec, look at the timing cover, it will be plastic as well with a crank sensor directly behind the balancer on the passengers side bottom, sticking out of the timing cover.
11-18-2012, 09:37 PM
#14
Also, here is one other thing I just thought of...
The valve guide bosses on the vortec heads can only take .460 lift before the bottom of the retainers start hitting the valve seals. Depending on what cam you have, that could be a problem as well.
The valve guide bosses on the vortec heads can only take .460 lift before the bottom of the retainers start hitting the valve seals. Depending on what cam you have, that could be a problem as well.
11-19-2012, 09:42 AM
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It don't have the plastic intake I will look later to see if it has plastic timing cover and sensor but it also has true duels and only one side has one wire o2. Where does the o2 suppost to go to? This one goes to some sensor on intak
11-19-2012, 10:55 AM
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That's what I'm thinking but the guy said it was a 96 vortec. He has a lot of wires but connected that's y I was thinking going carb cause I really don't want to figure his crap out. I wish I can run distributor and other stuff from computer still and just get rid of the tb crap. But I don't think that's possible
