Date: 19 Oct 2006 04:16:15 -0700 From: infonospamartmedia.com Subject: Re: '93 9000 Aero misfire...
Sounds like a problem I had with my '93 Aero ... The 'Check Engine' light came on. So I checked it by turning the key in the ignition to the 'on' position (without starting the car). Sure enough, the light flashed three times indicating a faulty air temperature sensor, but then it flashed five times indicating a faulty throttle position sensor. So I left it for a while - and continued on my way down the parkway - when suddenly there was a 'jolt' or 'shudder' - quite violent. Almost as if the turbo was 'on' and 'off'. After that though, there was no turbo boost at all. In fact it behaved just like a normally aspirated car ... I replaced the APC solenoid (top of radiator - three hoses going into it) - as I was told it was this that was causing the 'misfire'. But, this didn't solve it. I checked the turbo wastegate actuator - but that looked fine. I checked the vacuum lines - but they looked fine also. So in desperation I took it to my local Saab garage where I was told that the diagnostic equipment couldn't communicate with the ECU and that I'd need a new one! (sod that I thought and left). So I limped back home and decided to check the spark plugs and DI cassette - and lo and behold there was a crack in the DI cassette. Now I don't know if this is what is causing the misfire - but I've ordered a new one - and will probably fit it this weekend along with new sparkplugs. I'll let you know if this cures my not-very-fast-anymore Aero ... (if it doesn't - I'll start looking for a second-hand ECU I suppose...) Steve E. wrote: > "Charles" <cstoyernospamrpex.com> wrote in message > news:psudnZAJkPm_JKvYnZ2dnUVZ_qmdnZ2dnospamertel.com... > > 93 9000's do not have a distributor. They have a DI cassette. No spark > > plug wires either. > > > > Charles > > > > Paul Halliday wrote: > > > >> in article zoedndppDrYKJLPYRVnyvwnospamom, Hywel at > >> h.merrettnospamenworld.com > >> wrote on 12/10/2006 22:54: > >> > >> > I have a'93 9000 Aero with about 130,000 miles on the clock. If I > >> > accelerate hard the car seems to misfire violently at about 3500 - > >> > 4000rpm. > >> > This just happens for an instant and then it carries on accelerating > >> > hard as > >> > it should. > >> > I say 'misfire' because that's all I can think it is (maybe something > >> > else), > >> > but otherwise the car drives perfectly at all other times. > >> > Any ideas anyone? > >> > >> Does your '93 have a distributor with a vacuum advance? It sounds like > >> the > >> timing is getting messed up at the point it needs to be advancing. Just > >> guessing ... > >> > >> Paul > >> > >> Vart tog v=E4gen v=E4gen? > >> SAAB : Nothing on earth comes close > >> > > > > Could this be a turbo overpressurization with dumping thru the waste gate= ??
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