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jasonlachapelle

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Posts : 1149
Join date : 2011-01-24
Age : 35
Location : CFB Bagotville, QC.

PostSubject: 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.


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lamune

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Posts : 657
Join date : 2014-05-09
Location : Seattle

PostSubject: 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.
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Mark 96 Roady



Posts : 733
Join date : 2012-06-30
Age : 59
Location : Cleveland/Ft Myers Beach FL

PostSubject: 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.
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buickwagon

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Posts : 933
Join date : 2011-06-10
Location : Muskoka, Ontario

PostSubject: 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.
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Brandt51

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Posts : 100
Join date : 2017-08-14
Location : Las Vegas Nevada

PostSubject: 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.
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81X11

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Join date : 2010-06-23
Age : 44
Location : Round Rock Texas

PostSubject: Re: opti failure   Mon Oct 30, 2017 9:45 am

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Sprocket

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Posts : 5430
Join date : 2008-11-04
Location : Palm Beach County

PostSubject: 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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