SimonR Posted May 4, 2009 Share Posted May 4, 2009 Emissions failure: Hydrocarbons = 1,680 ppm ( Lambda = 1.04 (0.97-1.03 required) I was under the impression that Hydrocarbons = unburned fuel. If that’s the case, why is 7 times the hydrocarbon limit only .01 above the required ARF (Lambda)? Also, the AEM AFR gauge shows that AFRs are normal. I flooded my engine badly a few weeks ago and I’ve read that this can fark the o2 sensor. Sound like a starting point? No cat, but that hasn't been a problem before. Quote Link to comment Share on other sites More sharing options...
absz Posted May 4, 2009 Share Posted May 4, 2009 Blocked breather system can also give you high readings might be worth a check Quote Link to comment Share on other sites More sharing options...
SimonR Posted June 26, 2009 Author Share Posted June 26, 2009 It’s a misfire on number 6 (found by unplugging the connector when idling – no change in engine note). I’ve swapped plugs with another cylinder (no change) and swapped the coil packs between 5 and 6 (no change). The resistance on the plug wires for number 6 is the same as for the other cylinders. Having eliminated plug and coil pack, I’m guessing that it’s got to be either the signal to the coil pack or something horrible going on the chamber, but the plug looks ok. Any more suggestions welcome please. Quote Link to comment Share on other sites More sharing options...
chrispot Posted June 29, 2009 Share Posted June 29, 2009 do a compression test to eliminate engine, if low do a leak test, could be part blocked fuel injector? Quote Link to comment Share on other sites More sharing options...
SimonR Posted July 7, 2009 Author Share Posted July 7, 2009 Compression test revealed that it was the head gasket. A hole between cylinders 5 and 6, so no coolant or oil loss. Thanks. Quote Link to comment Share on other sites More sharing options...
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