Renault Laguna 1.8 single point inj: M reg. Eng: F3P - Rich mixture and misfire when warmArchived Message
Posted by Colin Calder on May 12, 2005, 9:01 pm
Stuck on this one, can anybody offer any pointers. Have rich mixture misfire, only when warm (very lumpy). On idle have Hc over 300, Co just over .3 Lambda 1 with good O2 and Co2. At cruise Hc will go good but co is rising. All comps 150 cold, oxy sensor is switching fast and high and low. Manifold vac: is good as is temp sensor (3.5V cold down to under .5V hot). Crank sensor is good on both signal and resistance. Secondary KV is good. Fitted a new cambelt to this last year and was running like a dream until the coil packed up a couple of weeks ago. Fitted a new coil and tested amplifier and thought I was home and dry until I ran it up, don't know wether it was running smooth just before coil packed up.Pre cat sample is rich but not sure by how much (just found a use for my old colortune, saves drilling a hole!).Looked in archives could not see anything for TBI, my local Renault contact said temp: sensor is a known prob: but this checks out good every time. All my books and data only show MPI. Injector would be my next stop but has good spray and pattern with no dribble. Any known nasties on this model? Any advice, much appreciated.