Fouled out my first set of plugs:

















A couple of times it didn't wanna start when i'd crank it over, after a while it would but acted real sickly then the idle smoothed out. Threw the stock plugs back in and fired up right away. So yay! Gonna let the car sit in the garage til i can get a retune. The base map is just WAY too rich

 

Damn dog, you got 3 threads going in the span of a couple of days.... At WOT, I see A/F ratios of 10.4/10.5 and have been using the same plugs for a year so far.

What plugs where you using again?

 

They are fouled because the plugs are too cold to clean up. Go with a step warmer plugs and you'll be fine.

 

^^Good info.

 

ive been running the same set of plugs i put on since my install and its been 3k miles so far with no issues. im still on the dezod base map btw. you must get on it a lot, lol.

 

they dont look fouled to me . a little rich but they dont look like the electrodes r dirty .

 

they do not look that bad to me either....

 

WOW those look brand new compared to mine

 

Hmmm, well it didn't wanna start a few times and missed while idleing a few times. Put the stock plugs in and eveything was perfect, only reason would be one of them are fouled

 

Just went outside to test her again. With the stock plugs still in, she fired RIGHT UP! With the other plugs in it strugled to fire up. Would take like 5 secs of turning the starter til' she'd turn over on her own and would sound very sickly for another 5 secs til the idle would smooth out. So it had to be a plug problem.



Now, i have another question. I have 550cc injectors in and just now when i cranked her up from a cold start i noticed my AFR's kinda bounced over the place. bounced around from 15's to 16's then into the 13's back to the 14's then leveled out between 14.8-15.2 AFR. Normal? The motor didn't skip a beat, just the AFR's changed. Only did this for about 5 secs.

 

Not 100% positive, but I believe that you would pay most attention to when the motor is fully warmed up. After warming, and your A/F is bouncing around while idle, then you may need to double check everything. Again, that's just what my understanding is.

 

The ECU is learning the cold start based upon feedback from the MAF, IAT and CTS sensors. It is quite normal for it to stagger for a few until it warms up.

 

Completely normal. The colder it gets, the longer that process takes, but only by a few seconds (assuming you don't have a wacky tune, since you're in open loop at that point).

 

When the car starts the ECU is in open-loop until the O2 warms up then the ECU will go into closed-loop and control the injector duty cycle to get the A/F to 14.7 -I think this A/F fluctuation is normal when you are running larger injectors -This could also just be casued by the wide-band the A/F fluctuates as the oxygen sensor is warming up. I think my car also had unsteady A/F until the 02 warmed up.

Anyone else experienced this?

xB, I also experienced sloppy starts with the 550cc injectors on my tC. It seemed that warm starts where never as good as cold-starts. Hot starts where always perfect. It would take 2-3 tries to get the car started most of the time. My plugs where not fouled. The car always started on the first try when I swapped back to the stock 370cc injectors.