Error On Cylinder Balance Test

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Error On Cylinder Balance Test

Postby Columbus » Wed Feb 06, 2013 7:11 pm

Keep getting eratic readings and an error message and it all stops after about 10 secs.
Error - Index was outside the bounds of the array
What is that likely to mean?
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Re: Error On Cylinder Balance Test

Postby Lee » Wed Feb 06, 2013 11:41 pm

Hi Columbus

Its possibly to do with the Signal Strength thats being seen by the PicoScope and Pico Diagnostics Software.

Unfortunalty i have seen this quite a lot on GM's i.e. Vectras, Astras etc. When scoping the Alternator Output on PicoScope its quite 'unstable' compared to other OEM's Output.

Have you tried really loading the alternator up to get a better 'Alternator Ripple Signal', for me i have to have the following on then i find it becomes more stable and gives a better reading:-

Main Beam
Front Fogs
Interior Heater (Full)
Heated Rear Screen

Give this a try and see how you get on

Kind Regards

Lee :D
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Re: Error On Cylinder Balance Test

Postby Columbus » Thu Feb 07, 2013 9:36 am

Signal Strength was 100% all 10 times i tried it. I didn't try loading any higher then just head lights if the customer comes back today i will have a go but he manually tested compression and found it to be low on one bank. I code read and found multiple misfire codes. I think he's already decided the engine is kaputt :(
The vehicle was a 2002 impreza wrx incase anyone has had trouble with these in the past?

Thanks lee
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Re: Error On Cylinder Balance Test

Postby Alan » Thu Feb 07, 2013 12:41 pm

Hi,

Quite a lot of work is being done on the code for cylinder balance at the moment. If you still have access to the car please can you try again with the latest beta release from http://labs.picotech.com/ and then upload the file here for us to check.

Regards
Alan
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Re: Error On Cylinder Balance Test

Postby Columbus » Thu Feb 07, 2013 6:52 pm

Did see the car again today but did my own manual compression test to verify the customers findings and the found a definate mechanical fault.

Will give the test a try on a couple of my vehicles to see if i get similar results or problems.
Thanks James
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Re: Error On Cylinder Balance Test

Postby DebbieSidera » Wed Nov 20, 2013 6:58 am

I have been trying the engine balancing test in 3 cars... I don't know why but it always shows ERROR. Yes, I have tried to connect the leads the battery, alternator and starter. Also I did it with the lights ans several electrical loads on.

Ferrari 308. Running perfect.
Ferrari 360. with a P1160 code on.
Ferrari 456. With a bad Idle.

Maybe I'm doing something wrong?...
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Re: Error On Cylinder Balance Test

Postby Alan » Wed Nov 20, 2013 8:06 am

Hi Debbie,

Are all of those engines flat plane crank types?

Thanks
Alan
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Re: Error On Cylinder Balance Test

Postby DebbieSidera » Wed Nov 20, 2013 9:04 am

Hi Alan,

No, they don't have flat cranks.

The F430 was the first one to a flat plane crank.

The best
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Re: Error On Cylinder Balance Test

Postby Alan » Wed Nov 20, 2013 9:19 am

Hi Debbie,

I am a bit confused now as I was fairly sure most of the V8s are flat plane other than when fitted into a Maserati when they use a 90 degree crank for smoother running?

Off to have a look on the web. Back in a moment....

OK this seems to suggest they are flat plane crank?
http://www.ferrari.com/English/GT_Sport ... shaft.aspx

Best Regards
Alan
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Re: Error On Cylinder Balance Test

Postby DebbieSidera » Mon Nov 25, 2013 10:52 am

Hi Alan,

"Omg" My English still too poor. Sorry I have confused about the crank word...
Yes, you are right the Ferrari V8 engines have a flat crankshaft (F308 and F360). They work as two 4 Cylinder engines on the same crank with two separate ECU's to manage each bank.
The F456 has a V12, They also run as a two 6 cylinder engines with two separate ECU's. of course the crankshaft shape is different than V8.

Thanks
Debbie
Attachments
456 crankshaft.jpg
F456
360 Crankshaft.jpg
F360
308 Crankshaft.jpg
F308
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