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Old 04-19-2009, 08:19 PM
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Surging 7.3

A friend of mine has a 7.3 that has started to "surge" going down the highway. Additionally, she says that people must think she can't drive a manual transmission because she is now "bunny hopping" down the road, mainly at the top of 2nd and 3rd gear. I thought it might be a semi-clogged fuel filter. Does the 7.3 have two fuel filters like the 6.0 and 6.4? Any ideas what might be causing this to happen? Thanks.
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Old 04-19-2009, 08:21 PM
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just the in tank and the bowl at the motor. easiest cure to the surge is a wicked wheel, but the combination of what you're decribing almost sounds like a fuel supply problem, like a fuel pump or something like that.
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Old 04-19-2009, 08:22 PM
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only has 1 fuel filter ... you need to get it on a scanner cold be lots of things
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Old 04-19-2009, 08:23 PM
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ditto on the scanner.
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Old 04-19-2009, 11:40 PM
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Thanks for the replies. Sounds like she may have to bite the bullet and take it in to the dealer. Not sure when the last time her fuel filter was changed, that's why I thought it might be that. I'll tell her to have someone check out the fuel pump too. Any other ideas? Thx.
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Old 04-20-2009, 06:59 AM
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fuel injectors?
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Old 04-20-2009, 07:06 AM
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Quote:
Originally Posted by Hawker View Post
just the in tank and the bowl at the motor. easiest cure to the surge is a wicked wheel, but the combination of what you're decribing almost sounds like a fuel supply problem, like a fuel pump or something like that.
He is not describing Turbo Surge which is what the WW is suppose to prevent.

He is talking about engine surging, which can be caused by fuel supply problem, bad injector, bad cps, or other problem that needs to be found.

You need a diagnostic scanner that is capable of doing KOEO and KOER tests. As well as scanning for DTC's.

Once you have the diagnostic scanner. Scan for DTC's, if none are found then do an injector buzz test, if it passes the injector buzz test, continue with a Cylinder Contribution Test. If it passes the Cylinder Contribution test and no trouble codes are found. Then I would suggest replace the cps.

But I believe the problem will be found with the diagnostic computer and running those two tests.
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