Posts : 1160 Join date : 2011-01-24 Age : 41 Location : CFB Bagotville, QC.
Subject: opti failure Sun Jun 11, 2017 6:44 pm
Optispark (83k mi original) was causing an intermittent and weak spark on cylinder 2. I changed out the opti and WP/Opti seals and now the car runs great. I hadn't read about optis causing single cylinder issues, but I guess it happens.
Posts : 868 Join date : 2014-05-09 Location : Seattle
Subject: Re: opti failure Sat Jun 17, 2017 12:14 am
That's weird. I would guess it was a problem within the cap, probably a broken trace.
Mark 96 Roady
Posts : 806 Join date : 2012-06-30 Age : 65 Location : Cleveland/Ft Myers Beach FL
Subject: Re: opti failure Sun Oct 29, 2017 9:39 am
What code were you getting? Your problem sounds like mine, but OBD keeps saying the MAF sensor, which is a new Buick part. I'm about ready to replace my opti since I've heard of other guys having weird occasional problems like this, and the opti was the problem.
Subject: Re: opti failure Sun Oct 29, 2017 5:39 pm
That cap looks like there might have been a venting issue. IIRC, there was a TSB about this. If the vent filter gets plugged, the vacuum can suck the cap in causing cross-firing.
Brandt51
Posts : 115 Join date : 2017-08-14 Location : Las Vegas Nevada
Subject: Re: opti failure Sun Oct 29, 2017 10:33 pm
Is that a highlighter? Good idea, I just bought a tool on eBay for that, damn it.
81X11
Posts : 9876 Join date : 2010-06-23 Age : 50 Location : Round Rock Texas
Subject: Re: opti failure Mon Oct 30, 2017 9:45 am
Posts : 6141 Join date : 2008-11-04 Location : Palm Beach County
Subject: Re: opti failure Mon Oct 30, 2017 4:51 pm
When I bought my 2nd LT1 wagon (Dusty), it had a miss on #7. Short version a new cap and rotor fixed it (after I changed EVERYTHING ELSE). the metal divider thing had a hole burned through it and it would arc through the hole to somewhere on the opti housing.... that was ~135K on everything as the even the hoses were still OE.
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Sun Jun 11, 2017 6:44 pm
