If converting to OBD1 from OBD2 what about the OBD2 knock sensor and crank sensor do you have to change them?

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1996 Trans am,Cc cam 305, 1.5,1.6 harland sharp roller rokers,1994 RK sport headers 1 3/4 coated,2800 continetal stall, 3.73 gears, CAI morroso,BBK 52mm throttle body.Ed right pcm. 100 shot dry.Port and polished heads. bigger valves.Port matched intake and polished.

 

You change the PCM and the knock sensor in the block. The PCM will/should come with an OBDI knock module already installed. Thats really all there is to it.

But with you A4 and 2800 stall, you're likely to get the evil 3rd gear slip.

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Dave
White 96 Trans Am M6
Hooker LTs, custom 3" y-pipe, MAF descreen, Ported MAF ends, LT4 KM, 1LE elbow, front Powerslots, shortened Pro 5.0, BMR STB, PHR & SFCs, SLP Loudmouth, Clutch/PP & CAI, !CAGS, NGK TR55s, Taylor wires, Konig Monsoons, MAC overdrive and March underdrive pulleys, ES poly tranny mount, Harlan shift light
*No times on Nittos yet...

 

But what about the OBD2 crank sensor will the OBD1 pick that up, or ingore it?
P.S.Thanks!

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1996 Trans am,Cc cam 305, 1.5,1.6 harland sharp roller rokers,1994 RK sport headers 1 3/4 coated,2800 continetal stall, 3.73 gears, CAI morroso,BBK 52mm throttle body.Ed right pcm. 100 shot dry.Port and polished heads. bigger valves.Port matched intake and polished.

 

I dont know of anyone replacing that for conversion purposes, so I'd say you're alright. I'm doing the conversion myself as soon as I receive my PCM.

 

I understand some of the reasoning behind converting over to obd1 with the ease of programming and the forgiving nature of these computers but have you heard of the problems that these computers have had with hard launches when using stall converters with stall speeds of 2800 and higher? Please take that into consideration before you make that change. For more info on this problem check out the post on this very subject somewhere in the first page.

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94 Z28 auto.White with white wheels.A few mods. 12.01 @113.5 N/A with a 1.67 60' on bfgs

 

I did the change. Depends on where you get the computer from. If you use your stock Knock sensor(96-97, you need to add a resistor in the PCM. If you change the Knock sensor to a 94-95 one the PCM will work fine. The Crank Trigger wires and rear O2 sensor wire just go "Dead". Everything works fine. Where are you getting your computer?

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KYLE-SERGEANT USMC
97 Trans Am with minor mods.
EMAIL: dayusmc@marimecorps.com

 

I can tell you first hand on my 97 T/A I did an OBD1 conversion and had to change it back to OBD2 thanks to that lovely "High Stall"(3200 Vigilante) problem that everyone with the OBD1 is having! You wont even notice the problem until you take it to the track and the car gets a really good launch just one time and you will kick yourself for changing over to OBD1.
I think I learned some new swear words getting over this "High Stall" problem & OBD1



[This message has been edited by 94DROPTOPZ28 (edited September 13, 2002).]