147 JTD 16V down on power even after new MAF - Alfa Romeo Forum
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(Post Link) post #1 of 4 Old 27-09-14 Thread Starter
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147 JTD 16V down on power even after new MAF

Hi,

I am having some on going problems with my 147 JTD 16V. She is down on power and slow to rev below 2000 RPM. Once I reach 2000 RPM she's like a rocket!

So far I have removed and cleaned the EGR valve and surroundings, and done a test on it via FiatECU scan. All tests show this is operating and working fine.
I have disconnected the MAF, which showed a marked improvement in performance making her drive like the day she was new. So I have replaced the MAF (body & sensor) with a bosch replacement of the same part number, plugged it in and the performance is back to sluggish again.

I am at a bit of a loose end now. What else could this be? Surely the car running okay with the MAF unplugged shows it must be the MAF, but I have the same symptoms with the new MAF?

Thanks in advance,
Louis

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Try checking all the turbo hoses for tight fit and or splits.
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Check your airflow at idle when EGR valve is closed (turn on the car and let it idle a few minutes, when EGR closes, check parameter "intake air quantity"), airflow should be ~480mg/inj when EGR is closed (you can check that EGR is closed if the parameter "EGR valve opening is 1%").

If you see lower airflow numbers than 450mg/inj, this could be either EGR valve issue, or clogged intake manifold.
You can try blanking off the EGR valve, and trying again with MAF sensor connected.

Does it smoke with the sensor plugged/unplugged?

If it smokes only when the sensor is unplugged, then there is a good chance the MAF sensor is OK, and it reports correct values. Then you need to check what is the cause for low airflow reading (maybe clogged intake, or even something like engine being slightly out of phase)...
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(Post Link) post #4 of 4 Old 08-10-14 Thread Starter
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Thanks for the replies. The car is not smoking and I am pretty sure my new MAF is working correctly. I am going to investigate the EGR again, and possibly try blanking it!

Time to plug in ECUScan!! Thanks!
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