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[bootzey]

I'm getting a MAF reading of 5gms/sec on tickover.

Then when the cooling fans come on it drops to 3.25gms/sec. When the fans go off it goes back to 5gms/sec. Is this normal please? This also happens if I turn the steering wheel, turn the lights on or operate a window.

I've noticed the MID flicker when something electrical is switched on.

Is there a voltage regulator that could have failed? Or a common bad earth? I've cleaned up the earth connections under the battery. Is there any others?

Also, what voltage readings should I be getting from the MAF plug if I put the red wire in a connector gap and the black wire to earth?

Also, when I pump the brake pedal the fuel trims increase to +25% on both banks. Then drop to -25% before settling again to "normal" of -5% to +5%. Is this also normanl.

Cheers

Dave

[Broomies Mate]

How are you getting these readings?  Some 'readers' are positively useless at interpreting the data from the ECU.

[bootzey]

Dare I say it.....Android Torque with an ebay bluetooth adapter.....I know I know lol

It clears the codes and responds very quickly.

I've had some trouble with high revs when pumping the brakes before and I've also had trouble with fuel trim codes/EML on when making right turns and going over speed bumps. The car can be absolutely fine, MID consumption was 18 but went up to 19.1 after a 3 mile drive today.

But I am having problems starting, well holding tickover, which I thought had been cured.

I've got 4 MAF's and get different things happening with each one.

I PM'd Kevin last week to see if he can Tech2 it for me, as I now have a bit of cash for a change, but as yet no reply.

She's a bit mixed up and I have the MOT on Wednesday!

[Kevin Wood]

Sorry for the delay in responding. I've been a bit busy recently and must have missed your PM.

Sounds like you might have a dodgy brake servo for a start. Pumping the brake pedal may normally give you a slight change in fuel trim, but nowhere near 25%.

MAF output sounds a little high to me. Was it fully warmed up when you took the readings?

What speed is it idling at?

It'd be worth giving the engine a thorough check over for air leaks. Breather pipes at the rear of the plenum cover, in addition to the O ring under it are a common issue, as is the plastic pipe that runs from the nearside of the plenum round the back to the brake servo. Often this will be chafing on something and develop a leak.

[Kevin Wood]

Oh, and regarding the voltage regulation, get a multimeter on the battery terminals and follow this guide:

http://www.omegaowners.com/forum/index.php?topic=90619.0

It's normal to be able to see a slight dip in the instrument illumination when turning on a heavy load at idle, but the battery voltage under various loads will confirm.

[bootzey]

That's ok Kev, no worries.

It's idling at about 620 to 670 on the scanner but the rev counter says 500. The MAF is 3.75gms/sec until the fans come on then the MAF reading increases to 5/5.5...it went up to 6 when I put other electrics on/turned the steering wheel...but the was no increase in revs noted.

MAF is 15.8gms/sec at 2460 revs.

The revs don't increase when pumping the break pedal anymore...not that I did anything to solve it other than cross my fingers lol even though you did mention brake servo suspicions before.

But as mentioned the F/T increases to +25% when pumping the brakes.

Breathers are clear, servo pipe in good nick but do have a slight hissing sound from rear of the engine (well documented here as you know). I've spent hours sitting on the engine with the scuttle off trying to suss out where it's coming from but just can't pinpoint it. Can't even tell if it's a sucking hiss or blowing hiss.

The air con doesn't work anymore but all 3 fans come on when needed.

The longer the car is left after driving the harder she struggles to hold on to tick over when restarted. i.e. in the morning is worst. However after a couple of minutes there is the sound of a solenoid clicking from behind the plenum and hey presto sweet as a nut.

If I remove the U pipe off the rear multi ram when not running there is a loud hissing as air enters the pipe indicating that there is no loss of vacuum.

I think that's all, you can see why I need that Tech2 now 

Cheers

Dave

[Kevin Wood]

MAF output sounds normal to me. Adding engine load (and electrical load means engine load too) means the engine needs more air to run at the same speed, so the increases in MAF are expected.

What are the fuel trims (short term and long term) sitting at?

[bootzey]

Long term 0% (but recently had battery disconnected for 24 hours), short term flips either side of 0% but never more than about +/-5

I made a note of this :-

TID 01 CID 05
Rich to lean sensor threshold voltage Max 140 Current 117
CID 06
Rich to lean sensor threshold voltage Max 140 Current 102

EVAP 7.06% but doesn't change with revs (ebay scanner i suspect)
H2oS 788.12mV
PC Solenoid 3.1 amps
Volumetric efficentcy 23%
Vacuum 22.7%
Lambda's flipping nice and uniformly between .1 and .8

No EML on (famous last words lol) but there was fuel trim codes raised