poor perfofmance

SUPRASHANE · 01-11-2007, 08:25 PM

I have a 1990 2.5 twin turbo limited edition automatic targa top with the revs increasing and degreasing in idle. when you select drive the revs drop but the acceloration is rising and falling as you are driving. i can also get the revs to drop if i remove one of the vacume pipes going to a sensor at the back of the engine.

can any one suggest where i might start looking. also can any one suggest where i could get a diagnostic reader for the fault codes ??

jfunez · 01-12-2007, 03:08 AM

pull those codes from the PCM first......it will save you lots o time...

SUPRASHANE · 02-11-2007, 10:23 PM

Quote:

Originally Posted by jfunez

pull those codes from the PCM first......it will save you lots o time...

thanks i have tied that but i cant get any codes

suprra_girl · 02-12-2007, 08:59 AM

have you tried doing the diagnostic from the box in the engine bay?

does the check engine light flash constantly or at several intervals?

does the check engine light come on while driving?

when pulling a vacuum line off it would generally raise the idle

what exactly do you mean when the revs will drop but acceleration would increase?

01-11-2007, 08:25 PM	#1
SUPRASHANE Stock Join Date: Jan 2007 Location: IRELAND Posts: 2	poor perfofmance I have a 1990 2.5 twin turbo limited edition automatic targa top with the revs increasing and degreasing in idle. when you select drive the revs drop but the acceloration is rising and falling as you are driving. i can also get the revs to drop if i remove one of the vacume pipes going to a sensor at the back of the engine. can any one suggest where i might start looking. also can any one suggest where i could get a diagnostic reader for the fault codes ?? Attached Thumbnails Last edited by SUPRASHANE; 02-12-2007 at 11:24 PM. Reason: problems have changed

02-12-2007, 08:59 AM	#4
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	have you tried doing the diagnostic from the box in the engine bay? does the check engine light flash constantly or at several intervals? does the check engine light come on while driving? when pulling a vacuum line off it would generally raise the idle what exactly do you mean when the revs will drop but acceleration would increase? __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

01-12-2007, 03:08 AM	#2
jfunez 12psi boost Join Date: Oct 2005 Location: georgia,usa Posts: 338	pull those codes from the PCM first......it will save you lots o time...