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Old 21-06-2011   #76
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Re: little squeak when auto box changes up

Still no luck Dave? I wish I could be more help but its really a Fiat tech who will have the answer to this, someone will have seen it before.
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Old 21-06-2011   #77
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Re: little squeak when auto box changes up

i think ive posted what danny asked for but he not replied, dont think he loves me any more
looks like this is going to take ages, you want me to send the box back?

hopefully I'll get cam belt and auxiliary belt and tensioners done next week to rule them out
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Old 23-06-2011   #78
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Re: little squeak when auto box changes up

No Dave no panic on the box, I hope you get the car sorted.
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Old 03-07-2011   #79
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Re: little squeak when auto box changes up

Sorry Dave, I've been busy and keep forgetting to reply to this.

Rather than going back and forth with graphs and data, I thought I'd give you a rough picture of what I'm expecting to see if the EGR is working correctly.

Vehicle stationary, engine warm and idling (EGR valve closed), rev engine- after returning to idle, the EGR will open for approx 2 minutes before closing again, during which time you'll get a graph like below-

EGR opening % in red
Mass Airflow volume in green

Attachment 92201

As you can see, the EGR valve opening and MAF readings are closly linked and work in opposite directions. With the EGR open, the MAF reading will drop slightly, then return to the original figure once the valve closes.

If the EGR is sticking once opened, you'll see this-

Attachment 92199

Everything is ok until the ECU tells the EGR to close. The ECU has shut-off the valve and assumes the opening % is 0, but the MAF reading not returning fully and quickly (or worse, staying low) shows the valve is not actually as closed as what the ECU thinks, and is therefore clogged or faulty in some way.

This can be recorded while the vehicle is being driven, but other factors can affect the airflow readings and it won't be as easy to tell.
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Last edited by custard; 01-08-2012 at 07:51.
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Old 04-07-2011   #80
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Re: little squeak when auto box changes up

like this? its a bit like it but more wiggly


Attachment 92215
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Old 04-07-2011   #81
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Re: little squeak when auto box changes up

I don't think "intake air quantity signal period" is the right parameter to select. Try the intake air quantity instead.

Weird that FiatECUscan shows the EGR as pulsing every 4 secs or so while open.
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Old 05-07-2011   #82
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Re: little squeak when auto box changes up

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Old 05-07-2011   #83
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Re: little squeak when auto box changes up

Looks good to me mate (if you even out the squiggles). MAF reading is dropping and returning correctly when the EGR is open then closed.
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Old 31-07-2011   #84
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Re: little squeak when auto box changes up

Quote Originally Posted by dave View Post
something else happened today, i pulled on to a busy roundabout fast and pas went for a few seconds, could this point to nackered auxiliary belt tensioner mentioned earlier, making belt slip?
hmm auxiliary belt dont power pas, time for a new thread
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