Date: Wed, 02 Apr 2003 23:47:26 -0400 From: Dexter J <lamealameadingdongnopsamlamelame.org> Subject: Re: Intermittent power loss after a service...
Salutations: Grunff wrote: > > davehinznopsamcop.net wrote: > > >>Violent bucking when accelerating? > > > > > > Mine did that a couple of times, never did find the cause. Did you have > > any ideas for that problem? > > Knock sensor is the most common cause of that. Also ignition > problems. > > -- > Grunff Yep - but the order is relevant.. In my case, I had a small oil vapor leak at the distributor that was grounding the bottom plug wire lead to the block - which would interfere with ignition momentarily - which was read as a knock by the sensor - which shut off fuel under boost - which causes violent bucking under acceleration.. The problem was a hairline run of oil on the bottom of the distributor that would basically dry into it's usually grimy state by the time anyone in service would look at it - because who the heck puts their hands down there with the turbo glowing away.. Once it cooled down - no ground - no problems at all - until it got good and hot and under boost enough to put pressure on the oil ring to let a vapor leak out.. I suppose you could get the same thing going on if the block didn't vent properly.. The previous owner replaced a wastegate and did the tranmission and several other bits and pieces trying to figure it out and I mystakenly put in a new fuel pump in hopes of fixing it myself.. That said - my distributor is still pretty worn out at 310,000km and even though a local genius figured the biggest culprit to be the 10 cent oil ring - I'm starting to get minor seepage in the distributor itself.. Same thing goes on with Buick distributors apparently I think.. It's hard to remember details like that whilst fighting off tears really.. It was kinda like having a pet passed back to you at the vet after a frightening illness after the bucking got really bad.. SAAB has a rebuilt kit - but I was wondering if anyone has a decent fresh replacement option for the whole unit, like a performance after market job or off another 'Euro-Rod' - which spell checks as 'Erred' BTW.. :).. And however much I would like to think it was the case - I can't think SAAB had it's own distributor shed as late as '89.. Anyway - If you run into a violent bucking pwob - that mysteriously goes away as quickly as it started - it's almost certainly the knock sensor cutting in.. Unfortunately at the price of the engine mounts and exactly - why - may be even more of a puzzler.. -- J Dexter - webmaster - http://www.dexterdyne.org/ all tunes - no cookies no subscription no weather no ads no news no phone in - RealAudio 8+ Required - all the Time Radio Free Dexterdyne Top Tune o'be-do-da-day Rocky Horror Picture Show - I'm Going Home http://www.dexterdyne.org/888/109.RAM
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