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Old 10-03-2012, 01:14 AM   #1
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Bogging/Hesitation

Hey guys, just signed up as I bought my first SVT Focus on Saturday. It has a bogging/hesitation in any gear at a low RPM until 3,500-4,000 RPM's. I just changed the bad Upstream O2 sensor and little difference. It is throwing a MAF code. Would a bad MAF have a factor into play with this problem? Any help is appreciated.


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Old 10-03-2012, 05:32 AM   #2
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Yes it would, clean it with MAF cleaner only or replace it.
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Old 10-03-2012, 05:33 AM   #3
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Oh and welcome to FF!!
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Old 10-03-2012, 08:45 AM   #4
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Rule of thumb that I use is that anytime I'm replacing something under the hood to disconnect the NEG battery cable while I'm doing the work . That way it resets your ECU to relearn the new parameters . After the work is done put the NEG battery cable back on , start the car let it idle until the motors at operating temperature . Then if its possible take it out for at least a 20 minute drive that way the ECU relearns the Air Fuel ratio along with your driving style.
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Old 10-03-2012, 04:30 PM   #5
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This is an inherent "flaw" in the SVT. A tune will take care of it, basically eliminate the bog you feel in low RPMs. A bad MAF would make it really bad, but a relatively normal bog in low end is... well, normal.
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Old 10-17-2012, 10:40 AM   #6
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Sorry for the late response, I cleaned the MAF, it was as black as my tires. Some MAF cleaner brightened it right up. Cleared the code, and still had a Bog/Hesitation. CEL came back on. I replaced the MAF, and all problems are solved. Runs like a champ.
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Old 10-17-2012, 12:06 PM   #7
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Quote:
Originally Posted by ItstheletterR View Post
This is an inherent "flaw" in the SVT. A tune will take care of it, basically eliminate the bog you feel in low RPMs. A bad MAF would make it really bad, but a relatively normal bog in low end is... well, normal.
I 2nd that. ^^^^^^^ And I'd add a cfm Throttle body too.
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Old 10-21-2012, 03:52 PM   #8
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Looking back, a tune on an N/A svt is not worth the money. You would probably see similar or better improvement from a lightweight flywheel and udp. Some will say there are no gains from a udp, especially on a dyno. But when I put mine in, it felt like I turned my AC off.
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