| View previous topic :: View next topic |
| Author |
Message |
RIPDOTCOM
Joined: 17 Mar 2006
Posts: 57
Location: Tallahassee, Florida
|
 Posted: Fri Apr 14, 2006 3:10 am Post subject: lumpy engine at idle |
 |
|
Idle at 850RPM is real lumpy. Engine seems to shake a lot. at 1050-1100RPM it is smooth. Check engine mounts and the look good. Any ideas or should I just set the idle at 1050  |
|
| Back to top |
|
 |
genikz88
Joined: 29 Mar 2006
Posts: 64
|
| Posted: Fri Apr 14, 2006 3:58 am Post subject: Re: lumpy engine at idle |
|
|
| RIPDOTCOM wrote: | | Idle at 850RPM is real lumpy. Engine seems to shake a lot. at 1050-1100RPM it is smooth. Check engine mounts and the look good. Any ideas or should I just set the idle at 1050 |
Have you checked the usual stuff?
Replacing the following really helped smooth out my idle:
air filter
plugs
plug wires
cap
rotor
O2 sensor
You might also try cleaning the injectors.
One other item I did with the tune up stuff was something by CRC by the name of "Guaranteed to Pass." I found it at Autozone. It's a fuel additive that helps remove carbon deposits. Believe it or not, I think this helped the most; my idle has been getting smoother and smoother the more I get through this tank, which has the additive in it. I'm going to run it in all my other cars to see if it makes a difference.
_________________
Chris
'88 924S |
|
| Back to top |
|
|
co
Joined: 24 Mar 2006
Posts: 24
Location: guildford uk
|
| Posted: Fri Apr 14, 2006 4:09 am Post subject: |
|
|
| hello ripdotcom i had this not so long ago ,i was told ,change the plug leads as they looked old ,so look for signs of cracks on the sliding protective parts of the leads ,they go first and its good indication they are old ,if leads look ok and you know they are not old ,check plug gaps and condition . chris |
|
| Back to top |
|
|
gohim
Joined: 02 Nov 2002
Posts: 4459
Location: Rialto, CA
|
| Posted: Fri Apr 14, 2006 4:29 am Post subject: |
|
|
What do you mean by checked engine mounts?
The symptoms that you describe sound like the classic bad engine mount/s problem.
Did you measure the height of the engine mounts, or did you just look at them? Porsche specifies a specific minimum height for the engine mounts and if they are lower than the specific height, then they are no good. You usually can't tell if tell are bad just be looking at them, unless you can see that they are torn, or leaking a ton of fluid. |
|
| Back to top |
|
|
Lizard
Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada
|
| Posted: Fri Apr 14, 2006 10:42 am Post subject: |
|
|
might also verify that the balance shaft is on and that they are set to the right notches
_________________
3 928s, |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
