cel light @4500 rpm

[topmech0]

hi all on the forum, i have a 993tt(MY 1998) here that is giving a CEL warning and has what feels like a missfire at 4500-5000rpm. if you drive it gentle then boost is there and no problems. if you give it heavy acceleration you get the flashing CEL and a misfire with a noise that sounds like detonation or pinking! let the revs drop to 3000 and light then becomes solid until next hard throttle. from the PST2 i get following fault codes. first thing i will do is change spark plugs(no idea how old) and the intake air temp sensor.this keeps coming up as fault.

P0112-intake air temp sensor

P0300-misfire damaging to cat converter

P0306-cylinder 6misfire damaging to cat converter.

this is after clearing all faults and carrying out second road test. any other thoughts of what i should check while head and hands in the engine bay? look forwards to your comments.

[White987S]

Topmech0, what part of the World are you in? I thought the 993TT was made in 1996 and 1997 (USA). But I guess a few others were MY 1998 like in Australia, for example. Thanks.

[topmech0]

Topmech0, what part of the World are you in? I thought the 993TT was made in 1996 and 1997 (USA). But I guess a few others were MY 1998 like in Australia, for example. Thanks.

in the UK.

[topmech0]

Topmech0, what part of the World are you in? I thought the 993TT was made in 1996 and 1997 (USA). But I guess a few others were MY 1998 like in Australia, for example. Thanks.

in the UK.

just to update this engine Cel coming on. I changed the spark plugs and although they all looked to be ok it seems that the problem is cured. Have taken it on the road and given it hrad acceleration for about 50 miles and so far no cel and no misfires or fault codes

Edited October 9, 2008 by Loren
Removed ALL CAPS - please do not post in ALL CAPS