Date: Mon, 21 Sep 1998 09:13:18 GMT
Subject: Re: 900T16S Intermittant Boost Problem

In article <>, "James Borden" <> wrote: > I have an 88 900T16 S which has developed a really annoying problem. > Sometimes it only boots to half way, or less. The next time I drive it, it > may be OK and fully boosting again. My garage has replaced the APC control > box, but this has not solved the problem. Does anyone have any ideas? > > Thanks in advance. > Your garage should not have gone to the expense (I believe around 300 pound) of replacing the APC box until all the inputs to the box had been checked to be OK. These are knock sensor, pressure transducer, engine rev's of the back of the rev counter and I think brake sensor on 88 up cars. I would guess that the problem you describe is due to a knackered knock sensor. Unbolt sensor from side of engine block, wrap in a rag and then go for a drive. If the effect doesn't occur then you know the culprit. Strangely I had a similar problem, whereby the boost would be let of suddenly and then wouldn't come back on. This problem got worse and resulted in constant activation of the APC solenoid. It turned out that the pressure transducer had been sticking and eventually got completely stuck at 160 ohms. I replaced the transducer but also found I had to re-adjust the trim pots on the APC box in order to get the boost back up. In your case if this has been happening over a long period of time I would go for the faulty knock sensor hypothesis. Yours sincerely NJ Haughey -----== Posted via Deja News, The Leader in Internet Discussion ==----- Create Your Own Free Member Forum

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