back pressure problem or not

Jackal13 · June 2nd, 2011, 06:39 PM

Put on a new cat with pipe from summit yesterday. Now the car ideals funny when I shut it off and when start it right back up vacuum drops and car almost installs. Few second later it's idealing fine. Is it from the lack of back pressure? Nothing has really changed besides the cat pipe. From a dual cat to a single cat.

OHC230 · June 4th, 2011, 11:15 PM

If you haven't all ready, dis-connect your battery and turn the ignition to the on position and leave it sitting for 20 minutes or more. This will normally re-set the cars computer and should allow it to re-map the fuel and spark trims. If this does not work, you may have another un-related issue,

June 2nd, 2011, 06:39 PM	#1
Jackal13 Newbie Join Date: Jun 2010 Posts: 33 iTrader: 0 reviews	back pressure problem or not Put on a new cat with pipe from summit yesterday. Now the car ideals funny when I shut it off and when start it right back up vacuum drops and car almost installs. Few second later it's idealing fine. Is it from the lack of back pressure? Nothing has really changed besides the cat pipe. From a dual cat to a single cat.

June 4th, 2011, 11:15 PM	#2
OHC230 Enthusiast Supercharged 89'/ 85' SVO 11.945 @ 119.6 Join Date: Jan 2010 Location: Napa Valley CA Posts: 879 iTrader: 0 reviews	If you haven't all ready, dis-connect your battery and turn the ignition to the on position and leave it sitting for 20 minutes or more. This will normally re-set the cars computer and should allow it to re-map the fuel and spark trims. If this does not work, you may have another un-related issue, __________________ Supercharged 2.7L 398 HP 501 ft lb !!

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