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Sounds identical to my problem. You should try holding the throttle part way to keep the rpms Constant between1500 and 2000, when the engine water temperature is around 130 or 150° before it fully warmed up. On my car, you can see and hear the idle isolating back-and-forth about 100 or 200 RPMs.

i tried running the engine in different modes - my mode, sport, track, and snow/ice the engine does the same oscillation/surging in all modes equally. it does not seem to do it when engine temp cold, but does do it well before engine temp reaches normal operating temp

I am holding the throttle pedal constant when it is surging in the video. But the throttle reading on the scanning software shows the throttle is moving up and down. But I’m not sure if that is the throttle position sensor or more likely the software in the engine management system

The video is in neutral with me revving engine. The surging is visible here close to 2000 rpm. When driving on the road the surging is most noticeable around 2000 rpm. But the momentum of moving along dampens it sometimes. Other times the bucking is really bad.

Manual. No engine codes when I use scanner. If u look in the video, in addition to spark advance and TPS surging, fuel pressure is also but not sure which is the problem and which is just symptom.

The engine surging/oscillation has gotten more noticeable to me. In these 2 videos from hp tuners scanner, i raise the engine from idle to an increased rpm and hold the throttle carefully constant. you can see how the rpms, the TPS and the spark advance all oscillate together. cant quite...

even with rev match off, my 5BW does this as well - matches rpm when shifting from neutral to a higher gear while moving. also, when slowly shifting up, from 2nd to 3rd for example, the revs will match for the next gear and not drop back to idle even if you are slow and off the throttle. i...

on my '13 CTS-V, which had similar wheel sizes to the current CT4, i used drag wheels DR-37 wheels - 18x9.5 i think - they cleared the 13 V calipers fine. but cant make any promises for my current CT5 BW, DR-80 wheels in 19x9.5 fit nicely

I forgot to mention that the drag wheels dr-80 need hub centering rings to minimize vibrations. The ones that came with them from one of the big suppliers were plastic and a bit too small. I think correct ones are 67mm inner and 74 outer

UPDATE on CT5 BW snow tires: i have had a few weeks now on DR-80 wheels (19x9.5) with Nokian snow tires 275/35 - 19. no rubbing, good fit. the car does very well in bad weather if you drive carefully. these tires in cold and dry seem great as well. very good handling. i used these for years...

I have drag wheels on my ct5 bw. Slightly smaller than stock width. See my posts in winter tire discussion.

I have 3 front rotors for CTS-V - came off 2013 V wagon - 2 piece front OEM Brembo rotors. one pair has about 30000 miles on them and they are now rusty because have been sitting. it is likely they could be used if you can find someone who can "Cut" them. I also have a passenger side almost...

i listed the details of all the parts a bunch of posts ago - the wheels are 19x 9.5 30mm offset. dont seem to have any interference problems in front or rear so far

So those thin black metal plates in the trunk are for the rear? That would explain why I couldn’t find anywhere to put them up front. I removed the front plastic things that I thought were air deflectors or ducts on the lower control arms for winter. Guess I’ll put them back on at some point.

Sorry. “Vents” should be ducts. I will correct post

i guess i have to check the tires that came off my car. but a 305/30 - the '30' is relative to the width. so a 305/30 is taller than a 275/30 would be. its going to be about 26" tall, which is about the same as 275/35. so i dont foresee a problem a 305/35 would actually be quite a bit...

its still all a little confusing to me. plastic air ducts stay on, on all 4 lower control arms? black metal pieces go where? protect front ball joint on track?

Hello - can anyone confirm what pieces are supposed to come with the car from new? i have iron brakes. the owner's manual refers to brake shield and cooling ducts both my car came with plastic air ducts bolted to the lower suspension arm front and rear. on the fronts, there is a huge gap...

they're ok - not my favorite but i do like them better than stock ones - should be easier to clean!

Another pic