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Showing results for tags 'compression'.
Hi, I think I may have an issue with the dredged exhaust vales leaking on my Polo 1.2 petrol 9N3, 1ith 186,000 on the clock. I have just completed a compression test and the figures obtained are as follows: Cylinder 1 - 230 & 243 psi Cylinder 2 - 210 & 220 psi Cylinder 3 - 200 & 205 psi I understand that there should be only a 10% difference between the highest and lowest figures and mine has 14% to 17% difference. The engine is running fine with the only ECU error of P0171 lean fuel trim, but only at idle with all sensors