Join Date: Jan 2011
Location: Monroe Center, IL
Car goes 'boom' after you start it
Here's a good one for you guys. When we took the car out on Sat., it seemed like every time I started it, you could hear, and feel a little 'boom', like 5 or 10 seconds after it starts. Don't know what that is? Kind of reminds me of a backfire. It only seemed to do it when the car was shut off for a short period of time (like when we were in a store). If the engine is cold, it's OK. My wife drives that car to work, and she hasn't complained about it, so I know it's not happening to her. My '87 Olds was doing that, too. But, that car has a carb on it, even though it's a computer controlled carb, it's still a carb. That being said, it's not coming out of the carb, but seems to be inside the engine somewhere. But, getting back to this car, do these fuel injected engines backfire? What could this be? Other than the 'boom', the engine runs perfect. Nice and smooth. It isn't a big 'boom', but something that you can definitely feel. It's not as noticeable on my Olds, you almost have to anticipate it, and wait for it, or else you'll miss it. But, on this GM, it was a more prominent 'boom', and was felt quite easily.
I just thought it rather odd that I have two completely different cars, with vastly different engines (and fuel delivery), that do the same thing!
2000 Mercury Grand Marquis LS (Mauarder "Clone") NEW!
1968 Cougar XR-7 302 CI 4bbl
1977 Ford LTD Landau (with fender skirts!) 400 M CI