Ignition Coils & Fuel System Issues
 

I've been absent from these forums for a while, but I've recently been having a few issues with my 01 I30. I had the dealership run a full diagnostic and they were happy to provide a laundry list of things that needed fixed...most of which I completely agree with.

I'm getting P0305, P0300 & P0420 codes. I've got over 120K miles on it, so I'm going to go ahead and replace all spark plugs and coil #5. The dealership highly recommended that they perform a "Fuel System Cleanup" which involves shooting all kinds of unknown chemicals through my intake and fuel system to clean out injectors and various engine parts. Has anyone ever done this? Is it worth it? I'm not opposed to paying a bit to make sure everything is done right. I'd like to keep this car running really well for a long time. Thoughts?

Get the coil & spark plugs changed and you should be fine. That fuel system treatment is just nonsense that will make absolutely no difference in the performance of your car. And it certainly will not cure the dreaded P0420 code.

That code indicates the Bank 1 catalyst is below efficiency and needs to be replaced. It will not hurt to drive it that way if the SES light doesn't bother you though.

Thanks for the reply. You're probably right about the fuel system cleanup. I may just try some Seafoam and see how she runs.

I replaced all the plugs tonight with NGK Platinum's and replaced coil #5. That was a lot easier than I was expecting. The car starts up perfect, but it still "jutters" at idle a bit. What about replacing the bank 1 O2 sensor?

Cold start idle issues on a 2000-01 are usually the failure of the upper intake seal. When this seal ages is becomes hard & brittle. The result is unmetered air is allowed to enter the intake manifold. The condition will sometimes disappear when the engine warms up, and be disguised when applying throttle as when driving.

My 03 was just having pinging issues on a light load... Seafoamed and the power is restored with the pings gone.. Better MPG readings after as well.

Did you use Seafoam in the crankcase or fuel? I just bought a bottle and was planning to use it in the fuel.

Since replacing the #5 coil and all spark plugs, she's been running pretty good. I don't know if its related, but it seems to start perfect when its not cold outside. I'm pretty sure I'm going to pass on the dealership's fuel treatment. Instead, I'm going to run some Seafoam through the fuel and see how that goes. I've had great luck with it in the past.

Fuel and vacuum line.. Tons of crap was gunked in there, lol..

I've heard alot of opinions on this Seafoam cleaner...

Does it work that good?? opinions?

Is this stuff good at cleaning the fuel system?

Someone mentioned putting it in the crankcase w/ the oil?? really??:eek: