Question about 1985 BMW R 65 LS

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Back firing Backfiring on left cyclinder thru Carby

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Plug not correct or ignition circuit broken

Posted on Apr 21, 2014

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What causes my 1965 4 speed mustang to backfire and sometimes stall?


backfiring is ignition of the fuel mixture while an inlet valve is still open. Check firing order as there may be a HT lead crossed . If it backfires then the mixture is burnt in the inlet manifold so there is nothing left for the cylinders so it will stall. If you are running holley carby then check the power valve for a hole in the diaphram Check for vacuum leaks. check ignition timing is correct and not too far advanced. if the HT leads are touching each other this will induce a spark in the wrong cylinder --use lead spacers from an auto spares shop

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1999 Oldsmobile alero is stalling and back fires


if backfiring it s probably the timing or the carby cbeck the timing with a timing light

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Honda 350 year 2006 quad is not idling proper and when you ref it up and let the ref of it back fires. Would this be wear in the carberator.?


not so much wear in the carby as loose carby mounts and or vacuum leaks. faulty idling and backfiring on deceleration is a sign of lean mixture

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Backfiring on deceleration


overfuelling ,check needle valve in carbs

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Is it backfiring. Thru the exhaust or the intake or the carbs

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My kawasaki 23 hp model # fr691v on a toro 50 inch ztr from home depot started back firing. there was dirt in fuel filter so I changed it. changed the plugs and new air filter. Cleaned the carb. now thw...


hi there

if you had the carby off and cleaned it out , was the fuel flow from tank to fuel pump ( if it has one ) good , and was the output from pump to carb good on cranking?

if so and the breather in cap is venting , it could be that the governor needs adjusting, possibly have got a spring in the incorrect position and there is no binding , pay to check , carby main jet closly for any obstruction. check the fuel level and float hieght .

most times hunt / surge is caused by obstruction to fuel flow , or governor

try holding the governor in a fixed position if hunt / surge still apparent - carby is causing fault
but if not governor setup is causing problem

cheers pauly46

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2 Answers

Back fires thru carb, dies if i take foot off gas IF i get it to start


Sounds like a timing problem. Back firing through the carb usually indicates that the timing is after TDC instead of before TDC. Not running would be an indication of the same. The normal timing is just a few degree before TDC (BTDC).

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1 Answer

I have a1988 s10 i am trying to get timed but when you try to start it it back fires thru the throttle body


This is only a suggestion but I had a similar problem. I have a 1987 Camaro Iroc z fuel injected. I had a similar problem with the car back firing through the throttle body. It turns out it was the TPI sensor mounted on the front of the throttle body. The sensor is mounted on the front of the throttle body to the left on my car, the opposite side of the linkage. Its black in color and has a electrical connection to the back side of it. Its triangular in shape and mounted with to hex head screws if this is of any help to you locating it. Try adjusting it first that may correct your backfiring problem like it did for me. If this was any help to you leave me some feed back.

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1 Answer

Mis-Fire Cyclinder #2


I WOULD GO FOR THE FUEL INJECTOR ON CYCLNDER 2...IF YOU NEED MORE HELP GET BACK TO ME!!!

Feb 25, 2009 | 2005 Audi A4

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