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toolman    Posted 03-31-2004 at 14:52:59       [Reply]  [No Email]
answer to this, i got a 93 chevy truck misses at about 500 rpm,changed everything new plugs, wires, rotor, cap, fuel filter, am headin to the parts store in about half an hour to get a distributor $220 .00 took the cap off the old one got some play in it cc to c or backwards a little up and down , how much play is allowed in the cc to c movement got at least a 1/8 in . if not more, would that be enough to change the timing and cause low speed or idle misses.lots of miles on it about 130000 or so. thanks guys been chasin this for days .

willie j    Posted 04-01-2004 at 06:03:19       [Reply]  [Send Email]
Had similar problem with GMC van, 4.3 engine. Bit the bullet & spent $60 to have dealer hook it up to scope. Had weak injector(TBI), Tech even gave me part NAPA number, told me to go home & change it out so to save the labor charge.$35 for part, 20 minutes to install. Took care of the problem. Total time from drive in dealer door til done was 1 1/2 hours, total cost $100. Could have thrown $500 worth of parts at it by guessing & maybe accidentally found the problem.
Had Chev 2.8 that wouldn't pass smog test. Hooked up scope, bad connection at oxygen sensor, 5 minutes to test, 10 minutes to clean connector, no parts needed.
IMNSHO cheaper in long run to spend a few bucks on diagnosis than throw a bunch of parts at it.
Willie J

toolman    Posted 04-01-2004 at 09:57:41       [Reply]  [No Email]
hi willie j , i asked the garages around here about the scope, they said it won,t show anything, you have to chase it down the way im doin it, seems kind of strange to me too but thats what they said, they figger it,s an ingition thing, not many places around with the old type of scopes either anymore , this is a 93 and they would need the old type for this truck, .thanks

Bob    Posted 03-31-2004 at 17:20:02       [Reply]  [No Email]
Up and down play is OK. Side to side play of over a few thousandths is not OK. The bushing wears to one side because of the side load on the distributor gear due to the load of driving the oil pump. The upper bushing has no lube besides what's in the sintered bronze bushing and it wears under the side load.

The worn distributor may well be the cause of your miss due to the magnetic rotor contacting the polepieces of the pickup coil for the electronic ignition. Even if replacing it does not cure your miss, with that much wear it needed to go anyway. The bushings are not available separately, but the distributor housing with bushings is not too unreasonable from GM, and even if the shaft is badly worn, replacing it with a new one from GM along with the housing is still cheaper than a rebuilt. Of course, this depends on the pickup coil and module being good, and you transfering those parts to the new housing!

toolman    Posted 03-31-2004 at 19:01:30       [Reply]  [No Email]
i got a rebuilt from lordco, 150.00, new pickup coil and module , i checked the play in the new one compared to the old one, lots of difference even in the up and down, and in the circular motion , in the new one there is none and in the old one at least 1/8 of a in. if not more, old one is sloopy new one it tight, i,ll put it in tomorrow and see if it makes any difference,like you said either way probably won,t hurt, thanks

Clipper    Posted 03-31-2004 at 15:19:07       [Reply]  [No Email]
BTDT with my New Yorker....went on fer weeks...troubleshoot till we wuz blue in the face....last thing checked was the culprit of course: THE VACUUM LINES!

buck    Posted 03-31-2004 at 15:15:47       [Reply]  [No Email]

Off hand I would say that the dist. is not the source of the miss. suggest hooking up a Vacuum gauge looking for sticking valve or small vacuum leak. Course wouldn't overlook the possibility that one of the new plugs is bad.

toolman    Posted 03-31-2004 at 15:28:12       [Reply]  [No Email]
nope checked vaccum lines, not valves , did the same thing with the old plugs, seems it,s a chevy thing with these distributors but im not sure how much play is acceptable, probably not much , it has a couple of sensors in there that could be goin or another coil as well it could be the beginning of the external coil breaking down, ,i,ll check the dist. at the parts store and compare the movement if theres much difference i,ll buy the new one,but we,ll see .all the shops and mechanics i know around here are telling me it,s probably the dist, thanks guys.

buck    Posted 03-31-2004 at 15:36:06       [Reply]  [No Email]

keep us on the learning curve and let us know the outcome.

toolman    Posted 03-31-2004 at 19:02:36       [Reply]  [No Email]
i,ll put it in tomorrow and i,ll let you know buck, thanks.

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