So I just had a bout with my '87 this weekend changing the timing belt, which was totally shredded and ready to go on me. The reason I checked her in the first place was due to some surging I was having at idle, up and down around 600-700, after getting fed up with setting the TPS and constantly having to set the timing. Changing the belt didn't do much for the surging, however, the timing is locked in tight now.
I did some research not too long ago on octane ratings, and found a bit of information regarding emissions and so forth. Having run 91 octane for about a year now, I've been noticing some pig stench from the tailpipe, and had an IMPOSSIBLE time trying to pass emissions last year (which turned into me tweaking the AFM to get through). The surging came out of nowhere about 7 months ago. Anyway, I've jumped down to 87 octane over the past couple of days, and it's completely ceased...sits perfectly wherever it needs to be, between being warmed up or on cold start.
Anybody have an idea as to why that may be? During my research I did find that the added octane may not be burned off, and forced out the exhaust. Emissions were high hydrocarbons, aka unburned fuel. Weak ignition on my end, possibly?
As a side note, I did try changing spark plugs, wires, and new/used distributor from a '91 I'd rewired in....just couldn't get 'er passed! :nono:
I did some research not too long ago on octane ratings, and found a bit of information regarding emissions and so forth. Having run 91 octane for about a year now, I've been noticing some pig stench from the tailpipe, and had an IMPOSSIBLE time trying to pass emissions last year (which turned into me tweaking the AFM to get through). The surging came out of nowhere about 7 months ago. Anyway, I've jumped down to 87 octane over the past couple of days, and it's completely ceased...sits perfectly wherever it needs to be, between being warmed up or on cold start.
Anybody have an idea as to why that may be? During my research I did find that the added octane may not be burned off, and forced out the exhaust. Emissions were high hydrocarbons, aka unburned fuel. Weak ignition on my end, possibly?
As a side note, I did try changing spark plugs, wires, and new/used distributor from a '91 I'd rewired in....just couldn't get 'er passed! :nono:
