Date: Thu, 8 Aug 2002 20:18:13 +0000 (UTC)
From: "Tim.." <>
Subject: Re: SAAB 9000 (1989) misfiring when revs go over 3000 RPM

"Mark" <> wrote in message news:aiufig$16sbd5$ > Would appreciate any help with this problem on my brothers SAAB 9000 CD > 2.0i 1989. Whenever the revs hit 3000rpm the "check engine" light come > on and the engine starts to misfire and stutter. Switch off the ignition > and restart seems to clear it but again once 3000rpm is reached the > fault appears. So far he has fitted 5 air-flow meters from breakers > yards and each time it has fixed the problem but it reappears again > after a few weeks (or if lucky 2 or 3 months). I don't know if something > is causing the air-flow meter to malfunction or the fault lies > elsewhere. Grateful for any advice. > > Mark > If this engine is one of the SDI ones (Saab Direct Igntion) change the coil cassette. Sometimes these fail all together, but often they go faulty and spike the supply with HT. The ECU's often can take this but the AMM cant and the HT spike fries them after a while. The stuttering is caused by the ECU shutting down momentarily when it gets spiked. Get it fixed before you blow the ECU as Saab ones are *frighteningly* expensive. Tim.. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system ( Version: 6.0.380 / Virus Database: 213 - Release Date: 24/07/2002

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