gemery10

I have had 14's on my 86 and they wore out the outer edge of both fronts way too quickly. Bought adapters to adjust bu they didn't fit. I since just run 13's but looking at it the main prob was the offset of the rims.

Ah, I see. Haven't seen either valve on my subaru so i think thats not the problem. I do have heaps of emission stuff though and some of it has been cut and blocked, I'll look into it. Thanks again for your help

Thanks for your reply, I am seriously thinking of going one colder on the plug as I checked again today after retarding disty and there is still a white tip. I am a lot happier with pinging prob though. Where is the EGR and ASV valve? There is plumbing all over the show I'm not sure whats what.

Just one more thing, I took out a few plugs today after some decent hill work and the tips are too white for my liking. Motorbikes run richer in summer why do cars get leaner? Why cant I just change the main jets up a size or two?

Thanks for your replies. I have retarded the disty by about 2 1/2 mills (no gun at present) and thats changed the power and the pinging. It has a more linear power curve and can hold revs on hills a lot better. Lost a bit of the pronounced hit of the second barrel but overall better to drive. Its pretty hard to make it ping even at 2000rpm under load maybe a bit with a/c on (95 octane ). Why do plugs and leads matter? Is it just that you get a stronger spark. Your spot on about that read valve for the exhaust so what is the egr valve that needs cleaning? It didn't ping before the engine was rebuilt so I was wondering if slightly higher compression or a rebore would have thrown the stock jetting out a bit? I do just run the hitachi not a webber but found from my motorbike tuning history on single cylinders that the plugs were a bit lean and the engine seemed to suffer when trying to hold wot on hills so I changed the jetting to bit richer. I'm going to change the fuel filter when shops open again do you think there is anything wrong with running a bit retarded from stock as it seems to run more powerfull in some ways anyway? Thanks again for your help, mechanics around here don't seem to know whats going on.

First of all, Hi to everyone out there making this a great site. I have solved many a small problem with your archives but this time I'm a bit confused. My car (86 L series) still pings under load with 98, 95, 91 and 89 octane gas in it. History is it has 325,000 k's on it but a rebuilt engine (full rebuild top and bottom) at 240,000. I've had the usual probs of lifter tick, dodgy carbs, blown heads etc. Car has new rad and runs perfect temp with a/c on but as the summer has topped 39 deg C plus high humidity I've noticed pinging with a/c on at about 3,000 rpm or lower on highway or on hills without a/c. Car runs better with higher octane but still pings, lower octane (89) it pings like crazy. Car revs out easily and doesn't ping when over 3500 rpm with second throat engaged. Mileage is good It has done this for the 120.000 k's I've had it but I didn't know thats what the noise was cause the headers were loose for a bit and the cat was rattly too. Another prob I had was popping on decel which was rectified by something to do with clamping the (I think) egr valve (mechanic said to do it but It was ages ago and I can't remember what I did in detail) Only mods to car are lukey exhaust, bigger tyres, bit bigger jets for more bottom end I have replaced ditsy rotor cap and button, new airfilter (old one v dirty) Car runs much stronger after those few things but still pings I am at sea level Australia north coast My thoughts are: new plugs/leads possibly colder plugs (plugs and leads are about 2 1/2 years old bosch brand) fuel filter (I know...) Timing retard (currently 8 degrees) Carbon build up (I don't think long enough but I have babied the engine a bit) I have a pretty strong mechanical idea with motorbikes but still hazy on more than one cylinder Sorry about the longish post I just wanted to put all the details in as I'm a little low on finance and don't want to do superfluous things Any ideas?