Vehicle & Technical > Discovery
MY V8 RUNNING RUFF plus a wierd air flow problem???
disco-v8:
ok just been messing with my V8 today to see why its not running right....
well just before the videos i made i took out all the plugs and did a compresion test and cleaned all the plugs up, look at some of these pressures
all in BAR!!!! (nice one mick)
10.5........(8 7)........10.5
10.5........(6 5)........10.5
11...........(4 3)........10.5
10.3........(2 1)..........11
not bad for an engine with a compression ratio of 9.35 that what you get buying recon heads that have been shimmed, the compression goes up
well fair enough i started it from cold and it may have been running at full temp but when i usualy drive it it gets hotter than this so some of the temperature reads are lower than i recon they do get, but doesnt matter cuz it still wasnt running right.... the sound on the video wasnt as good as i was hoping but just before i mess with the fuel pressure you should hear it back fire through the air box, and just after it does it aswell that cant be right!!!!!
(DAMB VIDEO IS TO LARGE TO UPLOAD ON YOU TUBE WILL TRY SOMETHING LATER)
ok here is another video which realy confuses me totaly, i thought while the engine was ruuning id take the lid off my airbox to see if there was any blockagies, but asoon as i started to take the lid of the revs started to die at first i thought that i might of been bending the inlet hose and blocking air flow but no this wasnt the problem, i tryed squeezing it to prove it.....
every car i have had including this V8, when i take the air box off the engine usualy picks up abit as the air flow isnt restricted, but this does the exsact opisit!!!! the sound file is abit hard to hear as all you can hear is the suck of the air, so i filmed the power stearing pully spinning, and asoon as i lift the air box lid the wheel slows down!!!!
http://uk.youtube.com/watch?v=DTAYq2lDmsk
can anyone explain this to me cuz im lost
Skibum346:
If it's not dying because air is being blocked.. I'd suggest it is because the fuel isn't there...
If the mixture is thin already... then you allow more air in by opening the airbox... the mixture is even thinner....?
TBH I'm guessing.
Only other thought is if it's an efi, the ECU is either duff or getting screwed readings from the Lambdas or other such sensors?
Good luck matey.
Skibum
Evilgoat:
MAF/Airflow sensor a bit dickey?
disco-v8:
--- Quote from: "Evilgoat" ---MAF/Airflow sensor a bit dickey?
--- End quote ---
my thoughts exsactly, still hoping its not this as it only about 5months old and only done afew 100miles on it!!!!! but if it is this y is it trying to stall when more air gets to it?????
so whats the best way of testing this then???? and remember mine is the airflow meter off a gems engine 4.0/4.6
Evilgoat:
--- Quote from: "disco-v8" ---
--- Quote from: "Evilgoat" ---MAF/Airflow sensor a bit dickey?
--- End quote ---
my thoughts exsactly, still hoping its not this as it only about 5months old and only done afew 100miles on it!!!!! but if it is this y is it trying to stall when more air gets to it?????
so whats the best way of testing this then???? and remember mine is the airflow meter off a gems engine 4.0/4.6
--- End quote ---
I'm not sure, only experience i have is with MAP sensors which are very different. I'm sure someone will be along, iirc its a Lucas Hotwire sensor but it may be different between systems. The increase in airflow may not be sensed and hence the engine is suddenly underfueled drastically.
Most ECUs have a LOS (Limited Operation Strategy) that allows you to limp home, maybe you are stuck in this mode if the Rover ECU has it.
Navigation
[0] Message Index
[#] Next page
Go to full version