Discussion
Try a Landrover dealer of someone like http://www.famousfour.co.uk/ they are only stock Lucas Land rover parts anyways 
hows is running Daz have you fixed the rich running fault yet?
hows is running Daz have you fixed the rich running fault yet?well how do i start ,the performance is fantstic so no complaints there .tvrmike offered to have alook ,he went through it starting from a compression test around 145 or more all pots ,he then checked the top dead center with some guage bolted to the rocker cover , from there checked all the sencers , lambdas , and many others .he used a machine which looked like a heart monitor and few other testers .every thing worked as it should .the only problem i have is a metalic tapping only when the engine is on load then clears as it goes in to the rev range .the car does not run smoothly from tick over up to around 2200 revs then the engine sounds fantastic .mike fitted his own cam which is a mc1 same as mine .mikes car as the same rough running up to 2200 then clears but he does not have the metalic tapping noise .i have been told that it may need chipping but im still a little confused about the tapping noise .i don`t know what to do next , i don`t mind spending more money if the problem is solved .what i do know after a local dyno center had a look at it is the car seems not to beable to burn all the fuel at that tick over up to 2200 revs and after that its close to perfect .im just wondering if a re map would sort the problem out including the metalic tapping noise .i would like to say thank you to mike for spending alot of time on my car .im one step closer to the answer as i now know the engine is healthy .
Edited by daz the plumber on Sunday 17th August 20:44
The o rings dont normally fail, and I dont think are available from Land Rover anyway. What can happen if the fuel pressure is wrong (too high) is the retaining clips bend as the injector is pushed down, so the injector drops a bit in its rail and starts to leak. You need to just gently prise the injector back up into the fuel rail with a scredriver against the head, so the clip will fit back in its slot. Ive only seen this with the return fuel rail blocked, so the pressure could have been 50-60 psi for it to happen. As for chipping, PLEASE DONT GO THERE IT WONT FIX IT. As Ive said before, at below 3400 rpm, the ECU has full control over the mixture. The Chip only controls the starting point, and the ECU can adjust the mixture by at least + /- 20%, so if its rich, something else is still wrong. It certainly wont cure a ticking sound either. Did you ever borrow that fault code reader what was the lambda outputs doing below 3400 rpm?
Mark
Mark
mike checked the lambda sensors with some type of machine , the pulse seemed to be a little to often ,do you think i should change the lambda sensors .so this metalic noise do you think it could be caused by the pre cat being removed .to change the o ring , does the plenum need to be removed .nothing came up with the code reader
Edited by daz the plumber on Monday 18th August 12:53
Edited by daz the plumber on Monday 18th August 12:55
The Lambda output switches at about 1/2 second intervals, and should never be static, and they can't switch too fast, so if the voltages are switching away, then all's basically well. The fault code reader would back this up, as if a Lambda probe stops switching for any liength of time, it will throw up an error code. Heres a really good plot of what happens from the Griff Forum . You have the air fuel ratio on the blue wiggley line,(as the lambda probes would show it) and rpm on the black. You will see the mixture being held at around 14:1 A/F (This is the lowest emmisions point) up to around 3000* rpm. This lower level is controlled by the lambda probes, and should not vary. Above 3000* rpm, the ECU goes open loop, and the mixture then becomes richer to around 12.5:1, which is the best point for maximum power, although this car leans off very slightly. The fuel then gets cut at about 5900 rpm as it hits the rev limiter. If you alter fuel pressure of the like, it will alter this above 3000* rpm point, but within reasonable limits the ECU should still hold the fuel at around 14:1 below this point. I would not expect the plugs to foul up if the probes are switching, or fuel economy to be to bad.
- I think the scaling is out on this graph, the normal open loop point is 3400 rpm, and a higher rev limit (both dependent on chip mapping)
Daz
Have you removed the pre-cats because when i removed mine i got and still have a metalic sounding noise which is just the gas flow going into the main cat, drove me mad for days trying to find the noise even put another new set of manifold gaskets in to no avail, you do get used to it.
Your rough running problem does sound like an air leak, have you checked the induction plumbing and try a little PTFE tape around the threads of the stepper motor hope this is of some use.
Graeme
Have you removed the pre-cats because when i removed mine i got and still have a metalic sounding noise which is just the gas flow going into the main cat, drove me mad for days trying to find the noise even put another new set of manifold gaskets in to no avail, you do get used to it.
Your rough running problem does sound like an air leak, have you checked the induction plumbing and try a little PTFE tape around the threads of the stepper motor hope this is of some use.
Graeme
yes ,the pre cats have been removed , the only time i get the clatter is when the car is on load, say pulling away in a high gear .when i keep the revs up i don`t have the problem , do you think its the pre cats ?why does it not happen when you rev the car when staionary and high revs whn driving .
Gassing Station | Chimaera | Top of Page | What's New | My Stuff