Re: Engine "Knock" or Misfire 2008 Turbo X SC (280 hp V6) - Saabnet.com Bulletin Board
No gasket is needed, you do not need to pull the intake manifold. It is really fidgety in the back, with the ECM, a bunch of wiring, and some vacuum pipes back there. The vacuum pipes are prone to break - either from you being there, or age, or both. Be prepared for them to be broken. They are not cheap, but I would consider just replacing them if they haven't already been. I believe the GM part numbers are 12588555 and 55556698 - one is part of the PCV system, the other part of the brake booster. Similarly, you're going to want to replace the spark plugs unless they are brand new. You don't want to go in there twice.
Misfires should be detected readily by the ECM, as should knock. It's possible you have weak coils but IMHO anything serious enough in-cylinder to produce an audible noise should set a code. I'd probably look elsewhere. Still, if the car has more than 100k on it, this work will come up sooner rather than later, no harm in tackling it in advance. I did the same.
posted by 12.195.130...
Posts in this Thread:
Post a Followup
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
This is a moderated bulletin board - Posting is a privilege, not a right.
Unsolicited commercial postings are not allowed (no Spam). Please, no For Sale or Wanted postings, SERIOUSLY.
Classifieds are to be listed in The Saab Network Classifieds pages.
This is a problem solving forum for over 250,000 Saab owners, so expect to see
problems discussed here even though our cars are generally very reliable. This is not an anything goes
type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the
Saabnet.com Mission and Purpose Page. Please remember that you are
not anonymous. Site Contact | Site Donations | Other Sites by SP -
Poverty2Prosperity.org | RandomScreening.com
Your address is: 220.127.116.11 - Using CCBot/2.0 (http://commoncrawl.org/faq/) - Logged.
Site Members do not see red text instructions, skyscraper, nor box ads.
Click here to see all
the Site Membership Benefits!