[rogerstaco]

A couple months ago my check engine light came on. I brought it in and scanned the code and it came up with a misfire on #1 cylinder. I was due for a tune up so I replaced plugs, wires, and fuel filter. I had low compression in #1 cylinder after all of that and the mechanic said there was quite a bit of carbon build up in the cylinder so he did a carbon flush on the cylinder. After that the compression came back up to normal. Everything was fine for about 2 weeks, then check engine light came back, scanned the code and came back with misfire on #1 cylinder again. The engine has steadily gotten worse, rough idleling, loss of power, etc. Any advice on what to do next would be greatly appreciated.

Thanks for the help.

 

[Skrillah]

probably a bad injector, if he "flushed" the cylinder (which i've never heard of doing....) that could have cleaned the injector to the point that it was readin ok for awhile.

You could try replacing the injector or it could even be a bad coil pack but don't do anything "major" until you check these two things. Who knows what the mechanic might advise but these could very easily be likely culprits.

 

[ShowStop]

Misfire usually means your losing fuel, air or spark. Start with the basics and verify all that is good. Next would be to do a compression check again and see where you are at. If its pretty low, its time to do a wet compression check and a leak down test. That should narrow down the problem to rings, valves, head gasket, etc.

 

[Tred]

How many miles? When was the last valve clearance check?

 

[2k1trd]

A couple months ago my check engine light came on. I brought it in and scanned the code and it came up with a misfire on #1 cylinder. I was due for a tune up so I replaced plugs, wires, and fuel filter. I had low compression in #1 cylinder after all of that and the mechanic said there was quite a bit of carbon build up in the cylinder so he did a carbon flush on the cylinder. After that the compression came back up to normal. Everything was fine for about 2 weeks, then check engine light came back, scanned the code and came back with misfire on #1 cylinder again. The engine has steadily gotten worse, rough idleling, loss of power, etc. Any advice on what to do next would be greatly appreciated.

Thanks for the help.

These engines had some valve issues...have the compression checked.for some reason it's always the #1 cylinder that goes first.The valve actuallly sinks in the seat and then hangs open slightly and gets burnt.

 

[99' baron]

Misfire usually means your losing fuel, air or spark. Start with the basics and verify all that is good. Next would be to do a compression check again and see where you are at. If its pretty low, its time to do a wet compression check and a leak down test. That should narrow down the problem to rings, valves, head gasket, etc.

x2

and excessive carbon buildup will actually cause a higher compression ratio

 

[elenex50]

I have an 01 and i just had my reading and it said cylinder #3 is misfiring. What are some other culprits. Whats the best way to clean the carbon buildup?

 

[deekyn]

I had the same problem with my 2000 2.7 taco two weeks ago. Ran a leak down test to figure out what was wrong. Had to replace several exhaust valves. www.random-misfire.com

 

[thegross1]

I had a similar problem with #3. Mine turned out to be a cracked head between 3 and 4 and oil was coming into the cyl.

 

[Goat Herder]

Holy toledo! I might actually be able to help someone else for a change!
Very easy, swap your coils between #1 and #2. I had the same problem after a tuneup. Turns out a coil went bad while changing spark plugs, ended up leaving me stranded. A freind came over with his diagnostics doodad from work, it showed a misfire on cylinder#?A, we swapped the coils and the misfire swapped cylinders with it, I replaced the coil the next day and have been running fine ever since.
Good luck and let me know how it turns out.
...Now if I could just figure out the variable horsepower and MPG problem...

 

[Scootn2nature]

"...Now if I could just figure out the variable horsepower and MPG problem"

Don't get me started

 

[Goat Herder]

Sccotn,
You having the same problem?
I've been beating my head against the wall... well actually I did and gave up.

 

[nickboy]

just took my toyota tacoma 2013 for code P0303 cylinder #3 is leaking coolant? anyway cost of labor $4,750 anybody has that happens before. toyoat dealer fix

 

[ShowStop]

just took my toyota tacoma 2013 for code P0303 cylinder #3 is leaking coolant? anyway cost of labor $4,750 anybody has that happens before. toyoat dealer fix

Leaking coolant is typically a head gasket failure. That is really expensive if its only a head gasket. Maybe also a new head?