New guy w/trouble codes

The joys of a new to me 96 RM estate collectors vs ny emissions... after years of watercooled vw vans cleared the fleet and jumped into the world of lt1s . Scanner shows 336 and 410 so crank position sensor A circuit and secondary air injection system. Any thoughts/suggestions on where to start would be appreciated- would love to cruise this baby to wagonfest... thanks in advance for any advice

Second code should be failed air pump. It can be deleted (and the pump plugged/fuse pulled) but you will need to reprogram the PCM to remove the CEL. This is emissions legal. GM actually made a label for it (and that label is reproduced). Most of us actually remove the air pump and the piping (although the TSB only allows for disconnection).

[You must be registered and logged in to see this image.]

For the first one, try clearing it and seeing if it comes back. If it does, throw a sensor at it, it's on the timing cover.

Thanks for the quick response jayoldschool. tried clearing so next step is new sensor. Disconnect of air pump underway. Assume the pcm reprogram is a dealer deal?

Programming is an aftermarket thing.

Put your location, and car in your signature.

Actually Fred, PCM re-programming for 96 can be a dealer thing. The TSB was issued by GM, as was the software update to turn off the call for the air pump.

However, it will likely be cheaper to do it aftermarket.

Any suggestions/sources fo aftermarket programming for this? Local dealer not helpful..shopping around further afield

Semi local dealer (mangino ballston spa ny) 95$ to reprogram for secondary air delete tsb. Not even a ten minute hold w muzak while they scratched their heads. (vs 300 quote just to diagnose from the other guys..) I'll post the outcome in case anyone needs similar around here.

The PCM is just looking for electrical continuity across that circuit. It's gotta be possible to just put a resistor across the plug and fool the PCM.

Alright.. pcm flashed on the 96 no trouble code for 2ndary air. Piece of cake. Buuut..now 0336 rears its ugly head again after new sensor. Oh and after reflash door courtesy/interior lights dont shut off?? Any thoughts

Solved interior lights red herring ground ( thanks to previous posters!) Any ideas on next step for clearing 0336 code after changing the sensor? Really would like to get a valid inspect on this as its not exactly inconspicuous.....

Beluga1 wrote:

Solved interior lights red herring ground ( thanks to previous posters!) Any ideas on next step for clearing 0336 code after changing the sensor? Really would like to get a valid inspect on this as its not exactly inconspicuous.....

download freescan and you can do it from a laptop with a cable to you data port under the dash

thanks appears thats for the obd1s? 96 is obd 2 yes? i hv a good scan tool for reset if sensor code reappears after flash and new sensor assuming recheck of wiring and grounds doesnt turn anything up that i missed whats next step if 336 code reappears? any thoughts? thanks for helping me through this.