Boxster back fire, rough idle and shut down :(

[kamran66]

Hello folks, my 2000 Boxster with 110K on the odometer back fired loudly and shutdown day before yesterday while I was driving @ 30 MPH. Thankfully it died on my block and I was able to push it up my drive way. I know you will probably ask me why I have not pulled the codes, well this rough idle and back firing thing had happened before and I figure it was a fouled up spark plug again. So needless to say I pulled all the plugs and changed them even found a broken plug tube on Cyl #4 which was also replaced, but no joy, cleaned the MAF also but it did not help. To clarify the last time I did this I had a hard time getting the coils tube/wire back on because some where not snapping in, however after a bit of struggle I got them in and the car ran fine. This last shutdown was weird because it happened at cruise speed, it just made a loud pop and turned off. The car turns over and starts but then back fires and runs very rough, as if 2 or more cylinders are not working...if I let off of the throttle it shuts off. So I'm not sure if it's a fuel or electric problem..(Don't even want to think about valve or cam issues right now).

PS: not sure this helps but there was a little bit of fresh oil in some of the tubes when I replaced the plugs, I changed the tubes about 4 years ago.

[JFP in PA]

Hello folks, my 2000 Boxster with 110K on the odometer back fired loudly and shutdown day before yesterday while I was driving @ 30 MPH. Thankfully it died on my block and I was able to push it up my drive way. I know you will probably ask me why I have not pulled the codes, well this rough idle and back firing thing had happened before and I figure it was a fouled up spark plug again. So needless to say I pulled all the plugs and changed them even found a broken plug tube on Cyl #4 which was also replaced, but no joy, cleaned the MAF also but it did not help. To clarify the last time I did this I had a hard time getting the coils tube/wire back on because some where not snapping in, however after a bit of struggle I got them in and the car ran fine. This last shutdown was weird because it happened at cruise speed, it just made a loud pop and turned off. The car turns over and starts but then back fires and runs very rough, as if 2 or more cylinders are not working...if I let off of the throttle it shuts off. So I'm not sure if it's a fuel or electric problem..(Don't even want to think about valve or cam issues right now).

PS: not sure this helps but there was a little bit of fresh oil in some of the tubes when I replaced the plugs, I changed the tubes about 4 years ago.

Get the car scanned and post the codes; without data, anything would be a guess.............

[kamran66]

Thanks for the reply, I had it towed to my indy he found the one of the intake bellow looking tubes had popped out..it was hard to see I would have never figured it out.