Checking out injectors - Ford Powerstroke Diesel Forum
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Old 10-29-2008, 10:28 AM
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Checking out injectors

I have run a few cylinder tests using AE and it seems like a few of my injectors might be weak/bad. I also think I have a slight miss, which is hopefully just a bad injector. I assume I don't have the knowledge or skills to check in injectors myself, so what should I do? Send the to someone to be check out, if so who. Also is this going to be a very expensive process, am I better off getting new injectors? Thanks guys.
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Old 10-29-2008, 11:05 AM
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talk to Jim at rosewood diesel awesome guy he can hook you up on here he is DZL JIM or here is his siteDIY-Injectors.com
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Old 10-29-2008, 04:26 PM
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Thanks for the link, I will check that out. Do you think that a faulty injector could be causing my miss?
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Old 10-29-2008, 04:37 PM
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What tests are you doing? Whats failing? How long have the MM been in the truck?

I doubt its the injectors.
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Old 10-29-2008, 04:47 PM
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Cylinder Contribution Test. The MMs have been in for over 2 years, I bought them used but put on new o-rings and all that. I have had the miss for a while, but it drives just as well as it always had. I finally did the AE test after reading about someone else using AE to figure out their miss. When I did the test no cylinder was more than 2.3% (usually these were less than 2%), some were 0%. I can't remember which cylinders exactly, I'll have to run the test again. I read on the ITP website than only be very worried if any cylinder read constantly over 3%, and none of mine did.
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Old 10-29-2008, 04:51 PM
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I assume you are taking about the Cylinder contribution test on AE, or possibly reading the cylinder rotational velocity in the live data graph. What were the results / numbers?

As a possibility, have you have replaced your CPS recently with the new one that Ford came out with during the recall? Quite a few folks have noticed increased numbers on the cylinder rotational velocity readings compared to the readings with the old CPS.
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Old 10-29-2008, 04:52 PM
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Quote:
Originally Posted by f25Opower View Post
Cylinder Contribution Test. The MMs have been in for over 2 years, I bought them used but put on new o-rings and all that. I have had the miss for a while, but it drives just as well as it always had. I finally did the AE test after reading about someone else using AE to figure out their miss. When I did the test no cylinder was more than 2.3% (usually these were less than 2%), some were 0%. I can't remember which cylinders exactly, I'll have to run the test again. I read on the ITP website than only be very worried if any cylinder read constantly over 3%, and none of mine did.

Well, you answered one of my questions before my slow but finished typing. Your injectors seem fine with those numbers. How about the CPS?
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Old 10-29-2008, 05:03 PM
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I would bet UVC harness or something along that line.
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Old 10-29-2008, 05:17 PM
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Thanks for the info guys, nope i have not changed my CPS. I will run the test again tomorrow and let you guys know exactly what the max numbers are. What/where exactly UVC harness? Is that the connection on the valve cover?
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Old 10-29-2008, 05:25 PM
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Yes, there is a harness under the valve covers and the valve cover gaskets them selfs. replace both.
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