Cadillac STS Forum - 2005 through 2012 Discussion, Rough start in Past Cadillac Vehicle Discussion; 07 STS 4.6, At first start of the day the caddy is really rough idle for about 20 seconds takes ...
- 05-15-12 04:44 PM #1Cadillac Owners Member
- Automobile(s): 07 STS V8
- Join Date
- Nov 2011
- NEW MEXICO
07 STS 4.6, At first start of the day the caddy is really rough idle for about 20 seconds takes a few engines cranks to start. No Check Engine Light, rest of the day starting is fine. Have tried injector cleaner, cleaned MAF sensor. Anyone got any experience in this matter or suggestions?
- 05-15-12 06:20 PM #2
Tighten the intake manifold bolts.
- 05-15-12 07:51 PM #3
Re: Rough start
bolts are tightened, i do check those regularly and i just double checked.