I have a 1986 305 ci TPI [ Vin F ] IROC , The problem I have been having is that my car is killing spark plugs .I have been using AC DELCO #R45TS they dont seem to last any time at all before the engine starts missing and popping out the exhaust , the plug leads , dist cap etc are all new . Iam going to change brands but we are limited as to what we can get over here in Aussi land I was thinking NGK or champion . The car is stock standard and has only 40k on the speed o anybody got any ideas and maybe part numbers or heat range .Iam realy sick of changing the F------
things
Regards Steve

 

Try some NGK #7

 

denso makes good plugs. champions are crap. do you smoke on start up? if you do then that is the problem. what do your pulgs look like (black, white, chared, gumed up).

thanks
anthony

 

Thanks Guys
Iam going out today to get and fit a set of NGK spark plugs , I looked them up on the net and they list BPR4FS to suit my car ,on another line I wondering if a bad oxy sensor could cause my problem the plugs are wet with fuel when removed the car blows no smoke at start up or any other time . I will fit the new plugs today and see if that helps I willlet you know how I go
regards Steve

 

i would change the o2 since you are running rich. it might be stuck on the rich side of things.

good luck

anthony

 

Well I changed the brand of spark plug and fitted NGK BPS4FS
which is the listed heat range for the car . I also changed the O2
sensor ,the now runs fine see for how long ,the old plugs were very wet and black maybe there is another problem any ideas
regards Steve

 

you may have a couple stuck or bleeding injectors.

put a pressure gauge on to see if your fuel presser falls off after shutting the car off. it should hold pressure for a good while (more than a few hours).

thanks
anthony

 

Thanks Anthony

Iwill check that out as soon as I get some time and let you
know what I find regards Steve

 

How are they fouling? The most common is oil fouling either by a worn engine(probably not with the mileage) or more likely a leaky intake manifold gasket. Changing plug brands won't make a hill of beans difference with a problem. Stock AC plugs easily last 25k or better. Pulling the plugs and inspecting them after you have the problem is the best way to get a handle on whats going on.

 

I've always had bad luck with ngk plugs. Set of A/C's in right now. Champions are way better than they used to be--especially the 'truck' plugs. Anyway, spark plugs fouling like you describe isn't the plugs fault--in fact you can probably clean them and reinstall. Figure out why they are fouling (like above, the injectors) and fix that problem.