Geofftaylor Posted June 15, 2019 Report Share Posted June 15, 2019 My 3A has developed a strange raucous noise on hard acceleration. It initially sounded like an exhaust manifold leak but it isnt. It occurs mainly in low gears at pull away but disappears once cruising. Any suggestions before I start wasting my time? Quote Link to post Share on other sites
RogerH Posted June 15, 2019 Report Share Posted June 15, 2019 Hi Geoff, welcome to the forum. Have you got an overdrive? Roger Quote Link to post Share on other sites
Hamish Posted June 15, 2019 Report Share Posted June 15, 2019 Hi Geoff have you changed fuel ? Could it be pinking or knocking. H Quote Link to post Share on other sites
TomMull Posted June 15, 2019 Report Share Posted June 15, 2019 Welcome Geoff, Not much to go on but my first guess would be the exhaust touching the frame where it goes through the box section. Tom Quote Link to post Share on other sites
Geofftaylor Posted June 15, 2019 Author Report Share Posted June 15, 2019 Hi all, thanks for your input. I have been through the entire exhaust system, including checking and thus changing the manifold to head gaskets, and all is well. There is a possibility that the knocking could be fuel related as I did use a different fuel recently. I will revert to my usual fuel and see what happens. I am at a bit of a loss with this one. Quote Link to post Share on other sites
Hamish Posted June 15, 2019 Report Share Posted June 15, 2019 (edited) Geoff a tank of shell v power should test this one to rule it in or out. H Edited June 16, 2019 by Hamish Auto correct! Quote Link to post Share on other sites
Geofftaylor Posted June 15, 2019 Author Report Share Posted June 15, 2019 I will make a fuel change tomorrow. It is a high possibility because nothing else has changed and I have checked the timing and carbs and they are near enough. Quote Link to post Share on other sites
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