Vehicle & Technical > Discovery
MY V8 RUNNING RUFF plus a wierd air flow problem???
smurf:
To check if its the Airflow meter just run with it connected, then run with it disconnected.
If it runs poor & miss fires etc with it connected, then runs ok disconnected then your Airflow meter is sending dodgy information.
Yes I know that disconnected it will run with a lack of power but it will run smooth because you have removed the faulty component.
If it still runs crap with it disconnected then its not the airflow meter.
The ECU uses a default mode if you disconnect a component.
Hope this info is useful.
solihull-mick:
--- Quote from: "disco-v8" ---
--- Quote from: "solihull-mick" ---Are you sure the figures you have are right? cos if your engine is running with 10.5 psi compression your doing well, 100psi is ok but a tip top engine should be more the 130 to 150 psi mark, do you mean bar?
And dont get confused with the 9.35:1 thats the compression ratio not what you get from the plug hole with a gauge, :)
--- End quote ---
nice one there mick, made my self look abit a an arse then :lol: yep i ment bar
and you no what i mean by the 9.35 ratio, when you do a compression test it should come up at 9.35BAR as it usued to do before i reconned the engine
--- End quote ---
The compresion ratio of 9.35:1 in not what you should get at each cylinder, thats the ratio that the cylinder compresses the air in relation to the cylinder size, do a google on it it will become clear, you can have a really low compresion ratio engine of say 7.2:1 that was my cosworth, but compression reading was 155 psi at the plug hole, hope this makes sense :D
Range Rover Blues:
I get around 200 PSI from a good V8, don't know that that is in bar though.
Anyway, I thought the MAF sensor looked odd, till you pointed out it's from a GEMS stystem. Have you tried putting the correct one back in?
It does strike me as a MAF problem though, have you tried running with it disconnected? my LSE will run fine with no MAF because it has Lambdas, these are the primary input for air/fuel ratio when fitted Blue doesn't have Lambdas and wil not run without the MAF sensor, well not that well at least.
solihull-mick:
--- Quote from: "Range Rover Blues" ---I get around 200 PSI from a good V8, don't know that that is in bar though.
--- End quote ---
I would hope your not getting 200 bar compression, thats the same a as an oxygen bottle full! 200 psi sounds right mate, and a very good 200 at that, :D
Range Rover Blues:
--- Quote from: solihull-mick ---
--- Quote from: "Range Rover Blues" ---I get around 200 PSI from a good V8, don't know that that is in bar though.
I would hope your not getting 200 bar compression, thats the same a as an oxygen bottle full! 200 psi sounds right mate, and a very good 200 at that, :D
--- End quote ---
That's my typing :roll: should have read what that is in bar.
Anyhoo, that was after a head skim and valve lap, arond 205PSI which is probably about as high as you might want, I did have one that ran up to 215 but that caused me problems :?
IIRC they need to be better than 165 PSi and within a few PSi of each other.
--- End quote ---
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