|
|
|
|
| Author |
|
|
Registered
Join Date: Jan 2008
Location: Warrenton, VA
Posts: 214
|
Engine compartment noise 99-996
I went to look at a low mileage 996 the other day and when I started the car I heard what sounded like a loud fuel pump hum from the left side of the the car. I popped the engine lid and looked inside but couldn't locate it. When I turned the car off, it slowly "spooled" down. Starting it up - it spooled back up. It almost sounded like an electric fan of some sort. Other cars I looked at didn't have this noise.
Any ideas? Thanks
__________________
'99 996 Arctic silver over black. In the past I've owned and wrenched on a '96 Audi A4, '86 944 NA. '79 928, '72 914. Non-Teutonic vehicles of interest: 3 MGB's (one converted to V8 power), Triumph Stag & TR250, Jensen-Healey, T-Bird SC. Most recent "project" was a Factory Five MKII Roadster. |
||
04-16-2013, 06:21 AM
|
|
|
Registered
Join Date: Jan 2008
Location: NJ
Posts: 1,186
|
Secondary Air Injection (SAI) pump, comes on for ~15-30 seconds at cold start to help light the cats.
Lives by your left knee when standing gazing into the engine compartment. Sounds like a vacuum cleaner. When they get very loud they need R&R to clean the carbon out of the pump and possibly grease the bearings. About $250 to replace with Bosch and $1200 with the same Bosch pump in a Porsche labeled box.
__________________
2013 991.1 Carrera S Cab 2004 996 Turbo CAB X50 sold 2003 996 cab 6 speed Sold 1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold DE instructor since 1985 |
||
|
04-16-2013, 07:07 AM
|
|
|
Registered
Join Date: Jan 2008
Location: Warrenton, VA
Posts: 214
|
Wow...yes, exactly like a vacuum cleaner.
Thanks!
__________________
'99 996 Arctic silver over black. In the past I've owned and wrenched on a '96 Audi A4, '86 944 NA. '79 928, '72 914. Non-Teutonic vehicles of interest: 3 MGB's (one converted to V8 power), Triumph Stag & TR250, Jensen-Healey, T-Bird SC. Most recent "project" was a Factory Five MKII Roadster. |
||
|
04-16-2013, 10:43 AM
|
|
