Date: Tue, 29 Apr 2003 08:05:29 -0400 From: KeithG <noonenopsamspring.com> Subject: Re: ECU - Bosch 0 280 000 901
Brian, your test is missing the most important part, the voltage at idle of the output pin. Burnoff and supply are important. I do not know which one that is on your car, but my '92 900T (lh2.4) is orange (pin 3?). This voltage must be in range to give a good idle. ALso check how solid the ground is. See if there is any voltage difference between the battery (-) and the ground to the AMM. If there is, clean them and retest until it is the same (important ground points are the one near the AIC and the tranny front). I do agree with the poster that suggested that a bad ECU is generally 'no start'. KeithG Brian Dean wrote: > As far as the AMM ... I observed the one second "glow" burn-off cycle after > shut down... no problems... tested the back side of the connector to the AMM > with the boot rolled back and a digital volt meter... ground at pin four and > +12VDC battery voltage at pin five when the ignition is on... > > Also tested the O2 sensor .. fluctuating voltage per the Bentley test > procedure...etc... no problems... cleaned the AIC valve and throttle body... > removed and cleaned the fuel injectors... tested the TPS... etc... no vacuum > leaks... no fault codes through any of the bad performance... just > continues to run very rich with stuttering poor performance under > acceleration/load ...etc... > > Suspect the ECU... but I guess I will take it past the local 25 year Saab > mechanics and spend some money for their opinions... > > Brian > > "Grunff" <grunffnopsam.com> wrote in message > news:b8jhud$95bmv$1nopsam52899.news.dfncis.de... > >>Brian Dean wrote: >> >>>'91 Saab 900 2.1 liter non-turbo >>> >>>Pretty sure I have a bad ECU. >>> >>>All components test correctly, but performance continues very poor with >> > very > >>>rich fuel/air mixture. >>> >>>Anyone have any history on repairing a Bosch ECU? I noticed a UK >> > company > >>>in South Hampton advertises on the web. Anyone ever use these folks? >> > ... > >>>http://www.carelect.demon.co.uk/frame.html >> >>IME bad ECUs generally mean no-start, no-run. If it's running, >>it's unlikely to be the ECU (not impossible, just very unlikely). >> >>If it's running rich, my money's on the AMM. This is a much more >>common failure than the ECU. Have you tested it? If so, how? >> >>-- >>Grunff >> > > > >
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