New AC Delco Plugs = Less Boost?? WTH...

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02-01-2012, 09:28 AM

#11

bad03xtreme

Senior Member

Join Date: 10-12-2007

Location: Manassas, VA

Posts: 456

I "seafoamed" my engine through the brake booster line with 0 issues. Not sure what the problem could be, did you throw the old plugs away? I went with NGK plugs 1 step colder than stock.

02-01-2012, 11:20 AM

#12

KissMy08SS

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Join Date: 08-02-2011

Location: Chesterfield Indiana

Posts: 447

I seafoamed mine through the vacuum line on the intake...that way it gets to all 4 cylinders evenly.

I have the original plugs...I put them back in...and it acted the same. Vince is on it now.....

02-01-2012, 01:34 PM

#13

Blue_SS

Senior Member

Join Date: 06-07-2011

Location: SE Mich

Posts: 2,180

Maybe there was knock previously that the ECU had corrected for? I don't know if these ECUs do that for certain, but others do. If that happened, the new plugs would require some re-learning. Like 2 or 3 restarts, or 100 miles, or something. I'm just guessing, but that kind of thing can happen.