CORVETTE117_117

Hi i have a 2001 corvette ls1 with a surging problem i have just drilled the throttle plate and the idle has improved but still bucks down the hwy almost undriveable
have done maf sensor,o2 sensors,tcm module and pcm still no improvement has this happened to anyone or anyone could guide me to the next step im am now out of ideas

garygnu

did you clean your idle air control ?I wouldn't have drilled the throttle blade.some things says change your tranny fluid,maybe the converter is locking up incorrectly.

TransamGCS

iTrader: (2)

you might want to check for a vacume leak, somtimes you can spray carb cleaner around the intake and vacume lines and listen for a change in ideal, i wouldnt have drilled a hole in the throttle plate you might have added to the problem and might now have to get a tune to compensate for the extra air going into the engine. did the surging hapen after you drilled the throttle body or was it already doing it before you drilled?

xxrillixx

iTrader: (118)

im with transamgcs. Not to add insult to injury, but for people who search and find this post with the same issue. Do not drill out the TB!

Blasko

iTrader: (3)

I concur.
With cars being so controlled by electronics, always take the time to try many different things before any physical alterations are done.

Wish I could help you out.
Best of luck!

blade2222

+1 for a vacuum leak. As stated above look around the intake and pcv system.

garygnu

great call on a vacuum leak,the pcv is a good bet.

CORVETTE117_117

i have hooked up a smoke machine to inspect for vacum leaks and the surge im getting is not at full throttle but 1/4 throttle and steady speed on hwy and the surge while driving has been there before the hole was drilled

CORVETTE117_117

The only reason i drilled out the tb was i saw post on this site to do so and it did help the idle but my drivabilty problem is still there
and i have checked all over for vacum leaks and none were found