73-87 Chevy _ GMC Trucks > Fuel Systems and Drivability
QUADRAJET 102:
Stewart G Griffin:
What things could cause a momentary "cutting out" and sort of a "sneezing" sensation (and thus a slight "bucking") from the engine?
NOTES:
stock quadrajet and quadrajet manifold
crate 350 (260hp version)
stock exhaust manifolds
Everything is basically stock.
The "cutting out" and "sneezing" (and thus a very,very slight "bucking") does not happen too often and it's only for a split second per each occurance. It tends to usually, but not always, happen in groups of 3 or 4 at a time.
Tonight was really the first "normal" drive i've given the truck since i've sorted everything out since i got the truck. The only thing i've changed since getting the truck is switching to a regular ignition from the "ESC" ignition system that came stock on 83's. The distributor in it now i bought from a guy about 5 yrs ago and is of unknown origin/age/mileage. So, i'm thinking that ignition may have something to do with it?
VileZambonie:
Sounds like a plug wire or connection causing a miss. You can do a quick test with a squirt bottle filled with water. Mist the wires thoroughly and road test. If it becomes worse narrow it down to the source.
Lt.Del:
how fresh is the gas? perhaps a liitle derbis causing a hiccup?
eventhorizon66:
I let my fuel filter get so clogged one time it caused my truck to buck (or sneeze) :-[. But I'm sure you've already thought of that.
As far as Vile's suggestion about going over all the electrical connections, don't forget to check the battery cables. I replaced a loose terminal on the negative cable of a friend's car. The engine was running rough at times and the computer was throwing a code for engine misfire. Cleared the codes after fixing the terminal and it never came back. Engine runs noticably better.
Stewart G Griffin:
ok, i think i've solved the problem; It turns out that the #2 plug wire was not on all the way and i think that was the problem because it runs pretty smooth now. It is suprising how one little thing could cause driveablility problems. i had the same thing happen on another car--a 85 monte carlo. After i had finished changing plugs, i apparently did not put #5 wire on snug enough. It eventually fell off and it caused a rough idle, but no missing/sneezing/cutting out. Perhaps the reason was because on that car, the distributor is computer controlled?
2) The fuel wasn't real fresh because the truck sat for probably 4-5 months; i filled up last night with some fresh gas.
a) The fuel filter will have to be changed regardless because i've had the truck for about a yr and a half, the filter hasn't been changed since i got it, and i don't know the complete history of the truck.
3) As far as debris, that may have also been the problem(or became a problem as a result of the popping/sneezing) and there is a little bit more to the story and it is something i want everyone to be aware of and i will post more as soon as i can get my pictures up.
Thanks again everyone who helped.
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