AAN serious Maf trouble..

[LHD_Kid]

600 gbp? For that I can fly to any point in europe, map the car and fly back...
Why would you pay 600gbp for a remap when you can buy and fit a standalone for that money?

Well, because sadly that's basically what MRC charge for a live mapping session...

[prj]

Well, because sadly that's basically what MRC charge for a live mapping session...

Well, if it's done on the dyno, then it makes sense.
Dynos are expensive, and dyno time is expensive.
Even if you get a standalone, dyno time will still run 70gbp+ per hour.

[Thuppu]

This thread and chat is very interesting. Please, go on...

[quattrojan]

The fuel pressure... you said it is 4.5 bar at idle.
Are you sure your car is supposed to run with 5 bar fuel pressure?

AFR should be 14.7 at idle...
Try disconnecting the O2 sensor, maybe it's stuck on lean.

When the car was finished we estimated 4,54 bar for fuel preasure was the right amount, and thats the way its been all the time and working well (nice afr numbers),

I did disconnect the 02, even swapped it with a brand new oem one i had lying around. No difference..

[prj]

Hm, is the connection to the FPR alright?
You don't have an issue with a leaky injector?

Car running rich on idle:
a) O2 sensor stuck on lean
b) Incorrect fuel pressure
c) Incorrect MAF signal/bad MAF
d) Injector(s) stuck

I don't think there can be anything else if it worked properly before.
Any kind of holes or leaks in the intake would make it go lean on idle, not rich, because it would suck in extra air that does not go through the MAF.
Misfire will always show lean as well (O2 not used).

[quattrojan]

Hm, is the connection to the FPR alright?
You don't have an issue with a leaky injector?

Car running rich on idle:
a) O2 sensor stuck on lean
b) Incorrect fuel pressure
c) Incorrect MAF signal/bad MAF
d) Injector(s) stuck

I don't think there can be anything else if it worked properly before.
Any kind of holes or leaks in the intake would make it go lean on idle, not rich, because it would suck in extra air that does not go through the MAF.
Misfire will always show lean as well (O2 not used).

a) Checked
b) same as before, so hopefully that shouldn't be the problem
c) 3 different mafs giv the same result (tested fine on other aan cars)
d) Only thing i've tried is to disconnect on at a time when the idling and there where difference. But if one or two isn't closing propperly that might cause some serious problem?

Any easy way to check the injectors? just taking the whole fuelrail with injectors out and se how the spray? with pos disconnected..

[prj]

a) Checked
Any easy way to check the injectors? just taking the whole fuelrail with injectors out and se how the spray? with pos disconnected..

The best way is on a special ultrasound washing stand for injectors.

http://www.youtube.com/watch?v=ZJmdvoZ83hY

How are you adjusting fuel pressure? If it's some cheap chinese adjustable FPR - I had very much trouble with them before.

The MAF signal - maybe not the MAF is bad, but the connector?
Try measuring the voltage from the MAF at different stages.

[quattrojan]

The best way is on a special ultrasound washing stand for injectors.

http://www.youtube.com/watch?v=ZJmdvoZ83hY

How are you adjusting fuel pressure? If it's some cheap chinese adjustable FPR - I had very much trouble with them before.

The MAF signal - maybe not the MAF is bad, but the connector?
Try measuring the voltage from the MAF at different stages.

got a drop-in adjustable fpr from 034 that i hope is of good quality?

Measuring the maf, well.. now i'm on thin ice....

The wires coming from the car to the maf, can i measure each of those (with maf disconnected) and what will the different coloured wire show? (if possible)

and how to measure the maf would be interesting to know as i kinda hate electrics...

hehe

[pasbogdan]

I had something like this before.If i pushed the throttle smooth i could rew it to 3000 rmp.If i got on boost side i got instant limp mode.Seems to me like a masive leak.
My problem was a 3 cm crack on the turbo to intercooler pipe.
I know this seems to simpple,but i had another one:
Map sensor error.After cecking n75,thinking of removing the wastegate i found the hose going from intake manifold to ecu NOT conected to moisture trap.
So..Get to a boost test of your sistem.

[prj]

Btw, if there is a heavy leak somewhere in one of the vacuum hoses, that connect to the FPR, you can flood the engine as well, because fuel pressure will go up at idle.

Check all these things.