Re: Can a SAAB "PING" / pre-ignite ?? - Saab 9-5 Bulletin Board - Saabnet.com
The banner above is an advertisment - if it asks you to download software, please ignore.
Site News -
7/1: Members: Log In to See Fewer Ads! |
5/28: SAAB Evolutions/TSN T-Shirts $14
[General |
Members |
C900 |
9000 |
NG900 & OG93 |
93 |
95 |
NG95 |
99 |
Sonett |
Vintage Models |
Clubs |
Other Cars |
FAQs |
Gifts |
Member Photo Galleries |
Member Directory |
Classifieds |
Manuals |
*Buddy Registry |
*Mileage Registry |
Polls |
What's New |
Raffle |
Photo of the Month |
Sponsors]
[Main 95 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Can a SAAB "PING" / pre-ignite ??
Posted by Dean [Email] (more from Dean) on Fri, 4 Nov 2005 17:36:31
In Reply to: Can a SAAB "PING" / pre-ignite ??, john fitzpatrick, Fri, 4 Nov 2005 11:16:33
Members do not see ads below this line. - Help Keep This Site Online - Signup
Pre ignition ping is when the mixture ignites before the spark happens. This requires that something be hot enough to trigger that. A worn spark plug, or heavy combustion chamber deposits can be hot spots that lead to that. If that is the case, then you can't blame the ignition system for something that happens before it fires the plugs.
Deposits and poor injector spray patterns can increase the "octane demand" of an engine, and that is called "aquired octane demand". This can be largely eliminated with a good fuel system cleaners such as Techron Concentrate. That is a very good product and easy to find in the USA. There are some other products that are worth using, but not easy to find. If you have not used the product before, I suggest the 20 ounce bottle. Thereafter maintanance can be done with the smaller bottle. I recommend every 8K miles or 3x/year.
Pinging can occur after ignition occurs, and the Trionic will avoid this if other things allow. Again deposits can make parts of the fuel mixture detonate from hot spots, as the heat and pressure climbs from the igntion wave front.
Make sure that the plugs are OK as well.
If you do the Techron Concentrate and regap or replace the plugs, and still have a problem, then you can look for something more serious.
There are some problems with MAFs going off spec and causing detonation and busted pistons on the Aero engines. If the MAF just totally failed that would be a better situtation than one that leads to pinging.
You can also then try some premium fuel to see how the system reacts to that.
Posts in this Thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
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.
StateOfNine.com
![](/tsn/xyz/stateofninebutton.gif) |
SaabClub.com
![](/tsn/xyz/scnabutton.gif) |
Jak Stoll Performance
![](/tsn/xyz/jakstollbutton.gif) |
M Car Covers
![](/tsn/xyz/mcarcoversbutton.gif) |
Ad Available
![](/tsn/xyz/buttonavailable.gif) |
![](/tsn/images/tsnmap.gif)
Random Saabnet.com Member Gallery Photos (Click Image)
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 | Run Club Menlo Park | ScreenBot
Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all
the Site Membership Benefits!