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Date: Fri, 17 Dec 2004 03:55:32 GMT
From: Dexter J <>
Subject: Re: irreproducible bucking

Salutations: On Fri, 17 Dec 2004 00:50:57 GMT, Sheldon Rabin <> wrote: > Ignition or fuel feed. Check for spark plug or HV transformer failure, > Check > the ignition casset, wiring and connections to it. > same for fuel pumps; check for intermittant wiring and worn points. > "Tom Reingold" <> wrote in message > >> My mechanics must think I'm nuts, because over the years, I have Further to my response: My engine seems to have ceased hesitation upon the addition of a new regulator today - the dash volt meter is not to be trusted as I suspected. We thought it might be the rectifier bridge, but that checked out fine. Interestingly, when the electrical shop got the alternator on the bench to test - it was reading fine having been banged around a bit getting it out of the car. They reproduced the problem by heating it up for about 1/2 hour on the bench - then shutting it down and going to lunch. They fired it back up and it was producing only 80amps with irregular voltages. The fellow working on it pointed out that the very small bosch regulator on the side of the alternator will split a seam once it rusts even a little bit and the circuit becomes untrustworthy and degrades quickly. When we put it back in the car, we thought we hadn't solved the problem at all as there was still an irregular idle despite having full amps and steady volts across the board. However, we had knocked one of the three vacuum hoses off the back of the manifold when we pulled the alternator and that produced exactly the same symptoms as low amperage and irregular voltage (slight misfire at idle, hesitation/buck on acceleration or steady driving at 2,500-2,700rpm) Anyway, I remain convinced that the SAAB engine management system is *greatly* impacted by aging alternators and I am now wondering how many DI units and Turbo's (both of which were replaced by the previous owner) are being serviced when the real culprit is at the end of the serpentine belt. The alternator is a cheap fix too - less than $75 Canadian at Rand Electric for the parts and service - about 3 hours at Halifax Autosport (Nova Scotia) to pull everything off and put it back on again with a fresh idler pulley. Interesting issue regarding rust-proofing application was discovered along the way. There is a very tight space between the front plastic wheel well liner and the steel inner wheel well/strut/spring support proper that remained untreated. I looked at it closely with the plastic liners out and realized that unless a wand is specifically pulled between the liner and the well - there is no way to rust-proofing material to weep in. I will run it over to Krown on Robie to take a look, I don't see it as a deliberate miss on their part - it's just a spot where gravity works against the weeping action and coats the plastic rather than the metal. Cheers and good luck. -- Radio Free Dexterdyne Top Tune o'be-do-da-day Xmas - Brian Setzer Orhestra - Sleigh Ride all tunes - no cookies no subscription no weather no ads no news no phone in - RealAudio 8+ Required - all the Time

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