radar502

I had to replace the EVEP system on my 93 ,hoses .canister the works . What in need is to get the $%^&* ( CHECK ENG ) light to go off . I have reset it and it pops back on .. Anybody know the driving miles to reset the ECM .. I discounted the NEG. side of the Batt. it works for awhile few miles pops back on .. I talked to some shops here ( Houston ) said it my never go off. Said the EVAP is hard to get right ... Thanks..

FASTAZU

First pull the codes to see why. If everything is right the light should not come back on. Once reset after you drive 35mph the relearn process starts. Not sure how long it takes for the fuel mapping to relearn but its not like an OBDII does not have readiness states that have to reset.

radar502

Its a code 26 . EVAP . I put air pressure on the hose coming from the canister and nothing came out at the motor end . The canister went bad bits of charcoal were in the lines was trying to blow them out it may be plugged up ??? Thanks

drcook

https://www.corvetteforum.com/forums...code-26-a.html

https://www.corvetteactioncenter.com...qdm-fault.html

http://www.corvetteforum.guru/module...post_id=248955

read the above, might help

having a 96 this is all different to me, but I found this


just asking (not insulting), did you do this ?

radar502

I read it and it made my head hurt . I just posted a question ,I put air pressure on the purge line at the motor and got no air at the canister ?? might be the problem .. Thanks ..

radar502

Thanks for the info I'm still finding problems with lines and such as soon as feel everything is right as I can get it I'll clear the codes . I think I might have a plugged purge line . ??

383vett

If you can't blow air through the line then it is plugged.

radar502

NNNNOOOOO not that LOL. O- well everything else has been removed why not the Pass. side rocker .. Thanks ..

drcook

it never hurt anyone to have a bit of knowledge.

replace the line or figure out how to clean it out and if that doesn't fix the issue, then you have knowledge of where to go from there

Kevova

93 LT1 ECM really doesn't have a reset procedure. A code 26 relates to a Quad Driver Module Fault. A QDM is similar to a circuit breaker. Shorted Evap , EGR, AIR bypass solenoids or AIR pump relay or related wiring can set code. I would get a FSM You could try unplugging electrical connector from each one, one at a time. see if 26 goes away.

radar502

Thanks for the info , I think the EVAP line from the motor to the canister might be plugged can't get any air through it ?? Had lots of charcoal in the lines from a bad canister ..and next start unplugging stuff..

radar502

Update : I know a little late been busy working on these old C-4s for other people .. After everything being replaced, needed it anyway , DA DA the plug in the EVAP bypass valve witch comes in for the bottom and very hard to see was not fully lucked in ,can't see it from the top looking down .The manual keep saying there is a plug there I didn't see it finely reached under the valve and felt it and gave it a push and yes I heard in snap in .O- well. Light off Thanks for all your help ..