tCZion

Hello!
My 05 tC is throwing that codes and has very rare symptoms. I already take compression and is good. Also change #4 ignition coil and all spark plugs. And still with the CEL.........the symptoms are when reach normal working temperature start to misfire and sometimes goes to limp mode and dont run more than 2000rpm. When I shift gears revs goes down and accelerate gradually (slowly) even if I press full throttle..........when that happens vacuum gauge goes down too and start boosting slowly too.

This is a manual transmission, has been Supercharger 55,000 miles ago, engine forged completely a year ago and 10,000 miles, no leaks no problems. Intercooler with the engine build, 10psi (after lose in I/C and piping) AEM FIC dyno tuned with wideband.........

I want to know is anyone with that or similar symptoms?? I trace all the harness looking for bad cables, I check connectors and even take out and clean the block oil filter for the vvti.....Any suggestion are well welcome!!

sebbyxtc

iTrader: (7)

i wanna see a picture of your intercooler w/supercharger. Anyways what spark plugs do you have first of all?

crush02342002

iTrader: (2)

sounds like a leak or tune issue...possible maf problem

tCZion

Im using DENSO IRIDIUM POWER IK24 - 5311, Im using this since Supercharged, now new ones like 50 miles on it.........for the intercooler picture, I dont have one but in my profile there is one of the engine with the piping setup. I will take one of the I/C and posted there too..........

Syldrin

iTrader: (1)

i'm with crush sounds MAF related.

sebbyxtc

iTrader: (7)

try cleaning your maf, or if that doesnt work replace it. check all your couplers and clamps for anything that might be loose

Syldrin

iTrader: (1)

I don't suggest cleaning a MAF. Replace it. it isnt an expensive part and there could be something else going on with it and for 100ish bucks just replace it.

crush02342002

iTrader: (2)

pepboys carries refurbished maf sensors for 78 bux plus 55 core. got one last month for a customer. imho nothing wrong with cleaning it as long as your gentle.

Syldrin

iTrader: (1)

i dunno it just comes across as a bandaid to me. maf's usually go bad shortly after something like this plus. 77 bucks is a drop in the bucket if you are boosted.

crush02342002

iTrader: (2)

I hear ya...lol

creamyxb2

iTrader: (1)

i agree with crush. maf or tune. ive been seeing alot of bad gas in cars. could be bad fuel. that can cause a p300 and p304 . misfire cylinder 4. but if it was bad you usally get all four. ive seen head gaskets cause misfires only when they warm up. check the coolant level. and check compression warm.

tCZion

Thanks for all the help..........I already take compression and its ok. Only thing I need to check is the MAF, I Will tested this week and let you know the result. I want to find this very soon, I have new goodies to install but need to resolve this first. If anyone think in another possibility of this symptoms let me know. Thanks Again!!!