I have a 1979 Bronco with a 351 modified. It idles a little rough and bogs down on acceleration if I punch it too hard. The acceleration problem turns into a chug instead of a bog and pop after about 40 miles and gets worse. The engine has just been rebuilt and has a reman distributor. The plugs and wires are new as well as the coil and voltage regulator.The noise suppressor went bye bye with the old coil but I still have it When setting the timing I noticed the pulse missing and even firing at the wrong time every so often. This happens consistently on all wires and the # six wire fires three or five times each compression stroke. With the light on the coil wire and without blinking a dead spot can be seen. I know the light itself is good because the #6 spark plug is much cleaner and whiter than the others. Seems to be completely burning the fuel mixture. This is a duraspark system and the emissions label says this vehicle complies with California emissions. So I would think It is a duraspark I. Can anyone tell me why This one plug would fire multiple times and the others miss 8-10 percent of the time? Could this be caused by low compression on one cylinder?
erratic timing light pulses on 1990 Ford Bronco
by Visitor in Natalia, TX on July 17, 2010
1 answer 1 comment
ANSWER by mastertech6371 , July 17, 2010
i am thinking real hard about that distributor. who was the reman unit fromm?? Roy
COMMENT by jaymz285 , July 17, 2010
I bought this one from Autozone. I decided to replace the original because when i tore the engine down I noticed some lateral play on the old one. I have an hei on the way from summit and hope my problem is the distributor. Its good to know a real tech thinks the same. I work on mack trucks. Jay