Guest ajsik Posted April 10, 2006 (edited) I have a peugeot 205GTi 1.9 running on bosch motronic 1.3, with lambda sensor before CAT (CAT is taken off ). There is a Gutmann camshaft 274/281 degree. I am runnig on a gutmann fuel map, but there is a lot of problem: 1. the CO ratio is very high on iddle revs when is engine cold , running on rich mixture ... when is engine warm the iddle revs are setuped to 1500 to produce good CO ratio , but it can run in 1000rpm if the mixture is not to riich 2. when is engine warm and car is going in low revs about 2000-2500 after a while a "K" light appears , if I go to higher revs or to iddle revs "K" disappears. (the fault code is 52) 3. warm engine, when I am slowing down from about 4000rpm with the gear, the engine starts to fire in to the exhaust from about 3400 to 2500 and if i am going in lows revs a and trying to accelerate the engine is not going smooth till it goes up 2500 rpm 4. I have to mount the engine temperature sensor out of the block, because if it is in the bolck, the engine doesnt run very well after i while... 5. i measure all sensor, the air flow meter is giving good ohms due to values in service book, the temperature sensor too, lambda is giving a 0.4 Volts when the car is runnig on rich mixture... I am thinking that the ecu map is not good, but I am not sure if the lamdba sensor has a power to correct wrong micture by giving ECU a signal that mixture is to rich. The iddle revs is regulated only by the period and the time when he injectors are open, there no iddle rev servo motor. So what exactly control iddle revs state, the rich of mixture? do you thing that editing map is solution for these problem that I described? Is there on the web any tool to display ecu map:)? where do i have to start ? many thanks for any answer Edited April 10, 2006 by ajsik Share this post Link to post Share on other sites
petert 588 Posted April 10, 2006 52 is a mixture problem, probably caused by the O2 sensor not being able to lock onto a stable mixture. The look up table in the 1.3 is very narrow and will try to lock onto 14.7:1 in almost all situations other than WOT. Are you sure you have enough CR to run that cam? The CAT model is only 9.2:1. I think you need a programmable ECU to get the best out of it, especially for the ignition. 0.4V for a rich mixture is very odd. I'd at least try a new lamda sensor. Also check the connector for the heater element. They have a nasty habit of corroding away. The ECU will simply not function correctly until it gets a reliable lamda reading. Share this post Link to post Share on other sites
Guest ajsik Posted April 10, 2006 I have found that there is no 12V on the heater element, but i thinked that the heating element is only for preheat O2 sensor after start when engine is cold. Does the O2 sensor need heating element all the time, or only a few minutes when engine is cold? ----------------------------- temperature sensor Do you have any idea, why engine goes better when the temperature sensor is out of the block ? I have an idea that the ECU has an information that the engine is cold and run on rich mixture, so it goes stable? But if I connect sensor into the block and start engine, it goes fine for a couple of minutes a then like a fast change (like switch on/off) engine goes very unstable and after a while stop due to low revs ... if the mixture is going lean the revs goes high and high and then the engine cuts...and on rich mixture revs goes down and down and endine dies...right? ---------------------------- O2 sensor i will take an osciloskope and measure the signal from lambda and injectors during the road run on warm engine...and load it here maybe it will be usefull to find what is going worng.. Share this post Link to post Share on other sites
steendp 0 Posted April 10, 2006 Have you checked for false air? In particular I'm thinking of the bolt that attaches the oilfiller to the manifold. Share this post Link to post Share on other sites
Guest ajsik Posted April 10, 2006 Have you checked for false air? In particular I'm thinking of the bolt that attaches the oilfiller to the manifold. actualy not, but the angine was rebuild , so it is a small change... maybe cuz of oil cooler and the oil pipes that going to it... maybe it is cuz of faulty heater (no 12V on connescotr) of O2 sensor Share this post Link to post Share on other sites
