: 2001 Catera cold start shake / vibration

02-16-13, 01:39 PM
My in laws catera has slight shake at cold start and it's just for few seconds. This started yesterday after I replaced the throttle body with a new one. Also, replaced the plugs, passenger side coil pack three weeks ago.

FYI- I completed the relearn process for throttle body so it's idling normal, a little high at cold start and then RPM drops to around 600 and drives fine.

My only concern is about the cold start shake (slight). Could it be a vacuum leak somewhere or something else going on here?


02-16-13, 02:25 PM
Why did u replaced throttle body ????

02-16-13, 03:53 PM
The throttle body was bad, rough idle and not responding well. Now, it drives really good but only has that initial slight shake / vibration at cold start then it goes away after driving around. I think it was there before but couldn't say for sure because of the rough idle from the old throttle body.

02-22-13, 01:36 AM
I have similar issue. Mine shakes till O2 sensors starting to work after warming up. I checked it with my OBD2 scanner. After that engine works as clock, very smooth. Engine was swapped/rebuilded 6 month ago, since then can't figure out what's wrong..... I don't know how it was before, because I got this car ruined, and kept for 6 years after it's death. May be it's typical maf sensor problems, also I get misfire codes, now it's only first cylinder. I guess it happens on cold while engine shakes.... Any ideas mates?

02-22-13, 07:14 PM
Well it doesn't have much of a vibration now, running pretty smooth with not much issues except for the O2 sensor. Getting a new O2 on Monday and swap it out and see if it helps any.

02-23-13, 05:07 AM
Okay...My curiosity is piqued!
How do you do a Throttle Body Relearn process?

I have the manuals. Is this process mentioned.

Please advise.


02-23-13, 12:57 PM
Yes, it's in the service manual not sure which page I found it.

I bought a new one and installed it. The process I did was, turn the key ON (do not start) wait 30 seconds and / or up to 3 - 5 minutes, let the throttle relearn it's position then turn the key off. Wait 30 seconds and then start the car. It worked for me and after 3 to 4 drive cycles it should be pretty much programmed.

I think another way to try is to turn the key ON (do not start) for 30 seconds and turn it off, wait 30 seconds and turn the key ON, repeat the same steps for 3 times, then start the car.