well that part didnt fix it then

kb5 · Jan 4, 2010

I have just fitted a new maf on my 04 V8 petrol L322 RR but has not improved the problem..
The problem I am facing is that when I rev the gas pedal it sounds like the engine is gasping for air just before it picks up and the car for a V8 has no power. I was told that this could be due to a dodgy maf sensor so I changed it. Has any one had this problem or knows of the solution.. I am starting to tire of these problems I keep facing with my RR and just want it to run for at least a week before something else going wrong

many thanks for any help...

chris

kooky_guy · Jan 5, 2010

Do you mean it's hesitating when you rev it?

If so, mine does the same, not that this helps you very much.

My lpg guy reckoned it was the MAF so I replaced it with a (bleedin expensive) genuine replacement which seemed to cure it for a while, but it keeps coming back again. I wonder if this problem had been present previously as the MAF had already been changed for an aftermarket one.

Resetting the adaptive values in the ECU seems to cure it temporarily, but it comes back again. The last time I had it serviced the chap said that the MAF was almost out of range (whatever that means) but he cleared the adaptive values in the ECU and it cured it again temporarily.

Anyone else got any ideas?

Guy

Oops., just realised that you have an L322, but it sounds like a similar problem. Maybe.

ssmn1234 · Jan 5, 2010

kooky_guy said:
Do you mean it's hesitating when you rev it?

If so, mine does the same, not that this helps you very much.

My lpg guy reckoned it was the MAF so I replaced it with a (bleedin expensive) genuine replacement which seemed to cure it for a while, but it keeps coming back again. I wonder if this problem had been present previously as the MAF had already been changed for an aftermarket one.

Resetting the adaptive values in the ECU seems to cure it temporarily, but it comes back again. The last time I had it serviced the chap said that the MAF was almost out of range (whatever that means) but he cleared the adaptive values in the ECU and it cured it again temporarily.

Anyone else got any ideas?

Guy

Oops., just realised that you have an L322, but it sounds like a similar problem. Maybe.

Have these got something like crankangle sensor?? is correct octane always used?

rewmer · Jan 5, 2010

A good place to start would be getting your O2 sensors checked. If you cant get your hands on a OBD scanner a simple multimeter can be used to see what they are doing. They should be switching hi/low every second or so if all is correct. If you have anything else further investigation may be required. Intake manifold leaks for example. Check for these by spraying carb cleaner all around the joints and see if the engine picks up.

If reseting the adaptives fixes the problem, then there is obviously something amiss. The engine ECU is being told by the MAF that X amount of air is passing while, due to a leak, you are getting x plus a bit which weakens the mixture, so the ECU adapts after sniffing the O2 sensors and ups the fuelling. Obviously this is only one posability. A good session with a reader will soon show up any problems...

rojbarker · Jan 5, 2010

See how it runs with the MAF unplugged completely. If it's better or the same, you may have a faulty MAF still. If it's worse then you've got another problem.

As for the O2 sensors, they are well worth changing if you are not sure when they were done last. Not sure if the Rangeys have 2-pre cat and 2-post cat sensors but you can probably pick up Bosch ones for about £10-15 each. I replaced the set on my Camaro and it made a huge difference.

kooky_guy · Jan 5, 2010

According to both garages the lamdas are working fine on mine. I've got 2 pre cat lamdas on mine. Pretty sure the L322 would have 4 though.

My cats are both totally shot though - the ceramic has been removed, I suspect. I'm still trying to decide whether to replace them or decat. Not sure if that would have any effect on this though. I suppose I could try unplugging the MAF, but it seems a bit suspicious that both would be dead in the same way. You've got to do this with the engine warm, right?

The hesitation is only a minor irritation on mine, but I'm sure the power is down on what I feel it ought to be.

gavbriggs · Jan 5, 2010

mine does it if you floor it theres a split second and then it picks up, theres no power loss tho

lambdas are are ok, it has always done it.

Beast o Bodmin · Jan 5, 2010

fit carbs for the ultimate response.

kooky_guy · Jan 5, 2010

Beast o Bodmin said:
fit carbs for the ultimate response.

And springs?

gavbriggs · Jan 5, 2010

nah just burn it!!!!

well that part didnt fix it then

kb5

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