1985-1998 [Subscribe to Daily Digest] |
 | [Main 9000 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Fuel delivery? Air Mass meter Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 12 Feb 2003 10:29:30
In Reply to: Engine die after turbo kick in???, Denny, Wed, 12 Feb 2003 06:39:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
In order to keep the boost gauge in the green zone, you must be using very small throttle openings and keeping to low revs. This implies low fuel flow rate. If the engine dies when you request higher fuel flow, I'd guess you aren't getting enough fuel flow. This could be a fuel pressure problem, either due to a bad fuel pump, clogged fuel filter, or bad Fuel Pressure Regulator (FPR).
Another possiblity is the air metering, probably the Air Mass Meter (AMM). The engine control measures air flow and schedules fuel. If it doesn't see the air coming in, it won't add fuel. Lots of air and no fuel is a super lean mixture, and the engine dies. If the engine runs if you can get the RPMs up to 3K, or if you floor the throttle, then I'd suspect the AMM. Make sure there are no major vacuum leaks between the AMM and the throttle plate - if unmetered air is getting in (cracked hose, bad hooter valve)
Lastly, and this one is a bit of a stretch, is the fuel cut-off switch. This switch is under the dash, and it cuts off fuel if the boost level goes too high. This should kick in at boost levels well into the red. However, this is just a diaphram and a spring. If for some reason the fuel cut-off is kicking in way too early, you'd lose fuel every time you get any boost. The way to check this is to simply disconnect the incoming hose (and plug it - no vacuum leaks!). See if you get full boost then.
posted by 192.249.4...
, Wed, 12 Feb 2003 10:29:30 <-- Viewing This Message
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.
 |
 |
 |
 |
 |
