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Gas Analysis Samples

The table below shows a selection of 4 Gas Analysis samples, taken from vehicle case studies.
They were measured using a SUN DGA 1800 analyser.

RPM CO% CO2% HC ppm O2% Lambda Vehicle Condition
Idle 2.84 13.03 436 0.50 0.925 307 TU5 (1) Engine just started from cold, illustrating rich mixture and cold catalyst (No Fault)
Idle 0.00 15.18 47 0.06 1.001 307 TU5 (2) As above, approximately 1 minute later (No Fault)
Idle 0.38 14.28 153 0.69 1.015 307 EW10 (1) Engine cold, catalyst not warmed up (No Fault)
Idle 0.00 15.12 0 0.00 1.000 307 EW10 (2) As above, engine hot (No Fault)
Idle 0.00 14.08 0 1.46 1.073 806 EW10 Injector misfire
Idle 3.47 12.83 269 0.03 0.896 306 TU5 Forced Rich mixture, ECT High resistance & O2 sensor O/C
Idle 0.00 11.89 49 4.51 1.263 306 TU5 Forced Rich mixture, ECT High resistance & O2 sensor O/C plus Injection misfire
Idle 3.30 5.50 2232 9.77 O/L 106 TU1 (1) Massive air leak at the inlet manifold, caused by brake servo hose disconnected
Idle 0.38 14.29 168 0.60 1.011 106 TU1 (2) After repair of above fault, the catalyst is shown to be inefficient
Idle 0.96 13.18 307 1.78 1.045 306 XU7JP4 Vehicle is equipped with a motor factors replacement catalyst. The catalyst is shown to be inefficient
Idle 0.50 14.82 1591 0.06 0.931 205 XU5M Hot engine with induced ignition misfire.(Plug lead disconnected). Unsure why the oxygen value is so low, I presume due to the catalyst action.
2000 RPM 0.05 15.16 67 0.06 0.998 605 xu10 j4 auto 1 Hot engine, vehicle suffering from sluggish response and lack of power. Sharp acceleration created 1.5bar back pressure at catalyst.
2000 RPM 0.00 15.35 6 0.01 1.000 605 xu10 j4 auto 2 Hot engine, new catalyst fitted. Vehicle returned to normal performance.
Idle 0.00 14.30 2 1.06 1.052 806 xu10 j2 High mileage (1) Hot engine, partial engine misfire evident. Note the following; especially cylinder No 4.
Idle 0.00 12.96 14 2.83 1.153 806 xu10 j2 High mileage (2) Hot engine. Cylinder No. 4 injector disconnected
Idle 0.00 12.05 17 4.02 1.233 806 xu10 j2 High mileage (3) Hot engine. Cylinder No. 3 injector disconnected.
Idle 0.00 12.02 14 4.15 1.242 806 xu10 j2 High mileage (4) Hot engine. Cylinder No. 2 injector disconnected.
Idle 0.00 12.14 16 4.01 1.232 806 xu10 j2 High mileage (5) Hot engine. Cylinder No. 1 injector disconnected.
Idle 0.51 13.22 116 1.77 1.069 106 GTI (NFX)-(1) Hot engine, MOT failure. New catalyst had been fitted. Not genuine and cheap!!
2000 0.67 13.52 147 1.39 1.041 106 GTI (NFX)-(2) As above, hot engine, MOT failure. New catalyst had been fitted. Not genuine and cheap!!

Last Reviewed: 27 March 2016Copyright © 2004...2016 Mark Stammers