Check Eng light on when cold off when warm

[zzzasy]

I'm fighting the dreaded check engine light. The code I'm getting is a misfire on cylinder #1. I have replaced the wires, plugs, and coolant temp sensor. The coil seems to pushing enough fire on one. I put some fuel injector cleaner in it and the light went off for about 2 or 3 weeks then it came back on. I have noticed that on warm days the light would go off. But, when I go out in the morning when its cold or cool, the light would come back on. I was comtemplating changing the injector, but if the light goes off when warm, it wouldn't be the injector would it? What's the board's thoughts on this problem?

 

zzzasy

'98 legacy outback stationwagon

[99obw]

I always like to start by looking at the inexpensive stuff, because I'm cheap.

 

If you had some change in the symptoms by using a fuel injector cleaner I would start with that route. I would seafoam the engine, change the oil, add 12 oz of Fuel Power to the fuel tank, clear the code(s), and fill it up with gas, in that order.

 

Fuel Power: http://www.lubecontrol.com/fuel.htm

 

I have yet to find an over the counter fuel injector cleaner that compares to FP.

 

If that doesn't fix it then I would run a compression test and try swapping a couple of injectors.

[zzzasy]

Thanks, checked on the FP. Its on backorder for 3 weeks.

[99obw]

Next best thing would be the big bottle of Techron Concentrate, available at Advance Auto Parts among others. You can get the seafoam there too.