Okay, I have spark knock and I was wondering if octane boosters really work or if it all just a big scam. Next time I fill up I can try getting some higher octane gas. Why would my car have spark knock though? Would too lean of mixture on carb cause spark knock?
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adjust your distributor. It could be moving and be too far advanced.
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How old is your engine? There might be excessive carbon build-up in the cylinder heads. Also, if you're not doing the pumping (somebody else doing it for you) you might be getting regular. I used to have that problem too until I got out and insisted that I pump my own gas.
PackmanComment
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Octane boosters are not worth the money. If you are getting a spark knock, there is something wrong or incorrectly set in the engine. Unless you recently switched fuels, fuel won't be the issue. Side note, gas went to 3.39 a gallon here today. All beacuse the local news stations said that we were at the national average, now they had to go above it..."Owning a 9-second Import is like coming out of the closet.... At first it may be surprising, but in the end, you're still gay!"
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Even if he was getting regular, I don't think these motors don't have enough compression to require premium. I'd consider timing or carbon build up though.Originally posted by packman View Post
Saiyaneye: if the timing is correct, try running some seafoam through the motor and see if it helps.Nick
88 Colony Park LS
G-pa's old car, but he's cruisin around heaven in his 69 wagon now
Future plans:Semi HO conversion, or Explorer motor swap, shift kit, PI springs and sway bars, KYB-GR2 shocksComment
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I already ran SeaFoam in the tank, poured in throttle body, and through PCV. I am going to get a timing light tomorrow. I don't even know how to use one, hopefully it comes w/ instructions. God gas is $3.33 today. Good thing I filled up when it was around $3.09Last edited by saiyaneye; 05-18-2007, 05:21 PM.Comment
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In stock form your motor does around 9:1 compression, maybe a little less. Not nearly enough to require high octane fuel. Overly lean mix can make it ping because the cylinder temperature will be very high, but normally its a timing issue that causes it. I'd check that and maybe replace the fuel filter just to be safe.\
actually using the timing light is easy. since you've got a carb its even easer
locate the timing marks on the balancer. they're stamped in there, might need to do some cleaning and/or rotating the engine to get at them
make a mark at 10 btdc with paint or chalk or whatever
clip the pickup lead from the light to #1 plug wire
hook up + and - leads to the battery
disconnect and plug your vacuum line to the distributor (if you have one)
start the motor and get it idling
aim the light down at the timing pointer. its on the passenger side, below the ac compressor. if the mark doesn't line up with the top edge of the distributor, loosen the hold-down bolt and adjust as needed
Last edited by gadget73; 05-18-2007, 05:30 PM.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers
Everything looks like voodoo if you don't understand how it worksComment
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