spark plugs+distributor cap problem
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Freshman User
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spark plugs+distributor cap problem
Recently I replaced the spark pulgs and wires on my 93 f-150. I noticed on the old ones some hard ashlike material. Further, with the new autolite plugs it seems to miss in second gear near 2500 rpm, and just not run the same. Could it be the plugs or should I consider another problem. Also when I went to remove the screw from the distributor cab it sheared right off with barely any force the cap is still secure but I have not been able to get the screw out any suggestions other than a new ditributor?
Postmaster
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spark plugs+distributor cap problem
Did the missing problem coincide with the distributor cap bolt breaking off ? Did all the plugs have the ash deposits ? Ive noticed those deposits on several 4.9L engines spark plugs , The engines dont use any oil , no fuel or coolant leaks , The deposits seem to be most prevalent on the No 3 Plug . What you can do is remove the dist , Place it in a vise & use a small drill bit to remove the broken screw & run a tap thru the hole to clean up the threads . I find the Motorcraft spark plugs do the best , Gap them at .046 & they do fine .
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spark plugs+distributor cap problem
Yes the bolt broke off and from then on the engine misses. I think it's safe to say that it is the autolite plugs,which were installed at the same time the bolt broke. The dist. cap is still tight and it was a good one that I put on originally and it was only a year old. And as far as I can remember the deposits were about the same on all plugs. At first I was thinkng the E.F.I had a problem (too rich). But I then saw a champion poster in a shop that had the title "spark plugs tell a story" and my plugs looked exactly like the ones that were taken out of a motor that had valve problems. The poster descibed the correction to the ploblem as an adjustment, but it was just some generic advertisement. I will try new motorcrafts and see what happens. I will also pull out the dist. and drill it out. Thanks vey much for the info.
Cross-Country
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spark plugs+distributor cap problem
You know, I had the same thing happen to me. Why they changed from that set of spring steel clips which held the distributer caps of FORDs as long as I can remember to those damm screws I'll never know. It's a disimilar metal problem. If you don't put a lube on the screws of a new cap they will twist off. When they do you can take a bunch of wireties and use them to hold the new cap on. Worked for me for over 60,000 miles, or you can replace the distibuter. As far as drilling it out. Think about hand holding a drill with a tiny, not small bit, because the screw is small, and trying to drill out a hard screw out of a putty soft metal distributer. Take it to a metal shop if you want any chance at all. I eventually replaced my distributer when trying to solve an erratic miss.
Carlos
Carlos
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spark plugs+distributor cap problem
[updated:LAST EDITED ON 18-Jan-02 AT 10:49 PM (EST)]Drill out the broken screw oversize. Then either use a heliocoil or retap it for an oversized soft steel or brass screw. Loctite the "Plug" screw in, and cut the top flush. Re-drill and tap the "plug" to the proper size and you are back in business. The dissimular metal problem will not re-occure with either soft steel or brass. As for the white plugs. Are you sure you don't have a vacuum leak? White means overheating and the #1 reason for overheating if too lean a fuel mixture. (#2 is wrong heat range plugs #3 is timing advanced too far) Herman
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