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Date: 25 Sep 2000 03:28:26 -0400
From: kenbellnopsamx.com (Ken Bell)
Subject: Follow-up: No restart when hot / hot cutout -- FIXED


The fix: New fuel injection relay. Details follow. Several weeks ago I posted about a problem with my '88 9000T auto refusing to restart when hot and cutting out when hot (normal operating temperature, not boilover hot). Along the way I replaced a suspect ignition coil, ignition module (amplifier), and electrical portion of the ignition switch. I was ready to replace the Hall Effect sensor in the distributor when something that a guy named Fred (posting as "brandybunch") wrote made me go and prove to myself that this was the right thing to do. Here's what Fred wrote: You are right about the Hall signal, however, you should be able to prove it there or not using the prescribed method from the tech manual. My only point in telling you this is that I have shotgunned problems in the past and spent allot of time and money inappropriately. With a few simple checks you may be able to refine your symptoms down to a most exact cause. I really did set out to prove that buying a distributor repair kit was the right thing to do. I connected a voltmeter across the battery terminals to see if there was some intermittent problem there causing the cutout, and another DVM to the Hall Effect sensor signal pins at the ignition amplifier. Finally, I put a timing gun on the HT lead. Then I ran the engine until it cut out (about 5 minutes). Results: voltage always around 13.4V, Hall Effect signal and spark always present when attempting to restart unsuccessfully. Ahah! I said. It must be the fuel pump. But, being lazy and cheap, I decided to first expose and wiggle the fuel pump relay in the glovebox to see if that might be the problem; and it turned out that each time I wiggled it when the engine was running, it cut out. But the problem wasn't the FP relay, it was the identical FI relay right next to it, and my less than slender fingers were bumping it each time I wiggled the FP relay. Wiggle, click, cut out. Wait until I could restart, wiggle, click, cut out. Replacing the FI relay (approximate cost, $10) solved the problem. Thank you Fred. And thank you also to all the a.a.s. and saabnet folks for your ideas in trying to help me solve this problem. -- Ken Bell :: kenbellnopsamx.com :: (212) 475-4976 (voice)

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