need some supplemental literature
Hi there! Did you order a paper back diagnostics service manual for your 8.1l Volvo? This manual isn't available online so it makes it hard to give you accurate advice without it. You'll have to fill in your engine info in the following link to find info about the manuals like seen below.
http://www.volvopenta.com/volvopenta...on_search.aspx
| | | EFI Diagnostics
(only available in printed version) | 27/05/2003 | English |
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| | | | | | |
| | | Engine Mechanical
Engine Mechanical 8.1Gi-B/C/D/E, 8.1GXi-A/B/C/D, 8.1GiI-B/C/D/E, 8.1GXiI-A/B/C/D
(only available in printed version) | 13/08/2003 | English |
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To finish up I need an injector tester which I don't have.
Such as an EFI Quick Probe to test the injectors. Here's some videos about the Quick probe in use,
http://www.bing.com/videos/search?q=...DC13B8D3A4AD22
There's also a coil tester that is similar to the EFI probe,
http://www.bing.com/videos/search?q=...CA124DDA533DDA
But I do have a Techmate Pro that has the ability to do a power balance test that, if I understand it correctly, would point me towards a faulty injector or coil pack.
My problem is when I select the test, rev the motor between 1000-2000rpm it only allows me to select A or H. It says that it's disabling for 5 seconds. I notice no change and the screen doesn't stay on testing screen but for a second and goes back to the screen to select A or H.
I really need some supplemental literature for this because the book is vague. I would think I'd be able to select A,B,C... One letter per cylinder, not A or H only. And it still doesn't seems to do anything. Can someone point me in the right direction?
Again without your manual it makes this difficult to say for sure but I'm pretty sure your engine is not set up to do the Power balance Test as the manufacture is the one that turns this feature on and off.
For the test to work, it's more set up for the sequential fuel injection vs the Batch and Semi Batch Injection Fire System. From everything I can find about the MEFI 4 fuel injector firing order for the 8.1l engines, the MEFI 4 only offers the Batch firing order which means there are two injector drivers inside the ECM for all 8 injectors.
If you by chance had the semi injection system, then you would have had 4 injector drivers firing 2 injectors at one time before moving to the next batch of injectors. Had it been Mercruiser's 8.1 then there are 8 injector drivers firing them individually making the power balance test more usable or at the very least more noticeable by way of both offering more choices A,B,C,+ options and feeling a miss fire....Which by the way can only really be felt under load/under way at around 1500 - 2000 RPM. In neutral gear at 1500- 2000 RPM, you won't notice anything.
As only a guide for you to look in your service manual the below link is of the Batch and Semi Batch wiring order for a Merc engine. You'll need to see how many different color wires are running to each injector....Or look at each injector on the engine and post the results for future readers too please. You'll need to turn the page once forward to see the Semi Batch wiring.
http://boatinfo.no/lib/mercruiser/ma...ser36.html#/98
Though hard to find, it lnd it looks like your fuel Pressure is good in the 41 PSI range.
Fuel pressure specification for Volvo-Penta 8.1Gi EFI
This spec was so difficult to find I am posting it in a seperate thread. The Volvo shop manual did not have it.
I found it in the volvo-penta publication 7742218 EFI Diagnostics(1).pdf
from page 240
"When the ignition switch is ON and the fuel pumps are running, the fuel pressure indicated by the fuel pressure guage should read 344-413 kPa (50-60psi) for 4.3, 5.0 and 5.7 models, and 248-303 kPa (36-44 psi) for 8.1 models. The spring pressure inside the fuel pressure regulator controls the fuel pressure." > Keeping link for future reference.
https://www.carolinaclassicboatowner...enta-8-1Gi-EFI
Power Balance Test (MEFI-4 thru MEFI-6 ECMs Only) The Power Balance Test is designed to assist a technician in finding a problematic cylinder. This test commands the ECM to disable the spark output, or on some systems both spark and fuel, to a selected cylinder thereby causing that cylinder to misfire (not produce power). This test must be enabled by the engine manufacturer. Upon selecting the Power Balance Test the scan tool will query the ECM to see if the test is available. The objective of this test is to determine whether or not disabling a particular cylinder will cause a drop in engine RPM. If a cylinder is disabled and the RPM remains the same it is likely that the disabled cylinder is problematic and not producing power under normal operating conditions. Please refer to the engine manufacturer’s service literature for more information on this test. • IMPORTANT: This test should be performed with the engine running at approximately 1500 rpm, at normal operating temperature and under moderate load. • Do not attempt to drive the boat while performing this test. • Follow all engine and boat manufacturer’s safety precautions and stay clear of all moving engine components. • Refer to the engine manufacturer’s service manual for special notes on performing this test.
Turns out the final outcome of
tgell001 issue was an incorrectly bought crank sensor....
http://www.offshoreonly.com/forums/...-expert-i-have-known-issue-5.html#post4346590
