Hi guys , I was wondering if anyone could help me figure out why my 2004 Acura TL 3.2 has all 6 cylinders misfiring? I recently changed starter, new alternator, and fuel pump. The car runs fine but I put it on a scanner and it showed a knock sensor code , which i replaced and it showed all 6 cylinders misfiring. Does anyone know what the issue could be?

 

Auto or manual transmission? How many miles? Give use some more info

 

It could be something as simple as a single bad coil. One coil failed on the J30 in my Accord, however, when the OBD-II codes were scanned it showed all six cylinders were misfiring.

When the shop told me all six were misfiring I told them B.S., the car ran exactly like only one was bad; I instructed them to move the coils around and track the misfire. After only two coil rotations they figured out which one was bad and the car has run like a top ever since.

 

It showed on the scanner all 6 cylinders were miss firing , hopefully all it is bad coil but my engine light stays flashing while driving and there is a little "flutter" to it in the beginning when I accelerate, I have 147,000 miles on it

 

It's a automatic transmission

 

One other thing, could the timing have anything to do with it? The timing chain was done awhile back

 

Don't drive car like that. If gas is getting into cylinder but not burning, it ends up in catalytic converter, and that will damage it. (and other bad stuff, just don't drive it)


- It has timing belt, not chain. If they put it back bad, or it jumped a teeth then timing belt might be a problem. But then engine would be most likely messed up, so let's not think about it now.

- It's automatic transmission, so engine couldn't be over-reved (right?).

If it misfires all the time, I would start by unplugging coil one by one. If you hear change in how engine is running, it was good coil/plug. If you disconnect it and nothing happens, you found cylinder that has problem. Then switch two coils and look if problem follows it.

 

That sounds like a good place to start trouble shooting on the coil, spark plug...thanks !

 

check the coil harness. i had the same problem on my old a4 1.8t
check the spark plugs 1st see if there wet/gas

 

Thanks everyone for the info , the problem was a coil , I changed it and everything is great! Thank again

 

timing belt tensioner could be causing this if it was not replaced when your timing belt was replaced. To verify this check to see if your cams are lining up.