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Username Post: Smog pump removal        (Topic#356916)
Posts: 1

Reg: 06-21-19
06-21-19 10:57 PM - Post#2768968    

I removed smog system on 1985 350 in a van30 on a motor home now have backfire problem any ideas

Edited by Tony on 06-23-19 10:50 AM. Reason for edit: Moved post to correct forum:

Senior Chevytalk Moderator
Posts: 24807
Loc: Austin, TX 78748
Reg: 05-09-00
06-25-19 07:26 AM - Post#2769213    
    In response to Jrmaasen

Welcome to the site. The van is pushing unburned fuel out the exhaust. The smog pump added air to help burn off fumes. The ECM is still changing timing. Changing the timing will help. Do you know initial timing? You can change it 1 degree at a time until it stops backfiring.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles

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