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Way OT Backfire

J

JimS

Member
I was watching a TV show, the TV version of Sherlock, and it in it a new or newer model car, it appears to be a Saab, backfires. I wondered, is this even possible with newer vehicles with all the sensors, computer controls, injectors, and exhaust controls? Seems to me no or at least an extremely low probability of occurring, just like everything else on the show.
 
If the crank position sensor or one of the coil packs go bad they can backfire. Usually running really bad at the same time.
BillL
 
When the Co-op finally quit selling leaded fuel I switched to unleaded in my 74 VW Beetle. It was a little odd. You would be running down the road and let off the gas and count to two and she'd backfire big as life. I loved it. I'm sure many a walker or bike rider had soiled drawers due to that fuel. Not to mention my sadistic nature.

Must have been something in the blend. As I recall it quit after a month or so but I don't recall doing anything to stop it. Although, filing points, timing the engine, and setting the valve lash in those is a pretty frequent occurrence.
 
Oh the good old days when we'd turn off the key on the old 3 on the tree and get 'er to beller as we drove by some poor unsuspecting neighborhood.
 
My customer had a backfire on one of the 7500 HP engines this winter, blew the outdoor muffler apart and all the window inward on the nearby building. We found out there was a particular place in the starting sequence where the fuel did not shut off if the ignition faulted and then came back on.
 
It may just have been an added sound effect. TV used to show cars squealing tires on dirt roads all the time.
 
Almost all the car sounds are added, Rockford files always used a Chrysler starter noise on the GM and Fords.
 
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