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Old 10-11-2013, 02:34 PM
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What would you do?

So I had a local shop do some diag on my truck as to why my truck was running rough. I got a call this morning saying that 4 and 5 injectors were performing at about 80% on the powerbalance test and that my FICM was at 40v. So I know I need to replaced the ficm no doubt about that but I was wondering about the injectors. Since the others are performing fine as of now and 4 and 5 are at 80% would you just replace the ficm and call it good if it does solve the rough running? I will also be adding rev-x too to see if that will help as well. I do plan on replacing the injectors with in a couple months anyways. but I'm just curious as to what you guys would do. Basically what I'm asking is if the ficm and rev-x does clear up the rough running, could I wait a couple of months to replace my injectors? Sorry If I am leaving any info out I'm a little short on time to write this.
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Old 10-11-2013, 05:23 PM
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Fix the FICM. Unless they switched out to a good FICM for the Power Balance, the results may be suspect; however, there is a good possibility that the test they did is valid. Rev X may work, or not. Of course, it doesn't always mean injector issues, but it usually is.
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Old 10-11-2013, 05:54 PM
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One of my batteries being bad caused FICM voltage to be low and rough idling
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Old 10-11-2013, 06:48 PM
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this is why I will always swap in a known good FICM and retest. no guessing what the ficm is or isn't causing.
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Old 10-11-2013, 07:47 PM
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Thank you guys for your responses. I doubt they put in a known good FICM and retested it. But when I got the call from him and he said it was at 40v I was actually a little shocked because a couple weeks prior, when the rough running started to happen I checked the FICM and it was at 48v and 47.5v when cranking. So I thought for sure that my FICM was in good working order. Mind you my truck has been sitting for little over two weeks from the time I hooked it up to the scan tool from my work and to the phone call I got a couple of days ago from the guy doing the diag on my truck. just seems odd, Have you guys ever had a FICM just completely crap out with no warning even if you keep tabs on it?
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