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Post by Hueneme805 on Mar 25, 2015 0:35:20 GMT -5
What up turbo group. I been having a problem with my engine bucking/surging during driving at most time between 2700-3200 RPM and speed of 55-63 mph on 4th and 5th gear. My AFR gauge will go back and forth to 12.2 -15.7. If I just tap the gas pedal a little more it will stop. Other wise car runs great. I've checked all vacuum lines and replaced VAM. Timing is stock.I don't know were else to check? TPS, control module or internal waste gate maybe? If any body has any suggestion please help.
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Post by Stinger on Mar 25, 2015 0:50:38 GMT -5
Where is boost under these conditions? Does it do it at steady speed or at a slight acceleration or a slight deceleration?
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Post by Hueneme805 on Mar 25, 2015 12:12:48 GMT -5
Its not in boost and it does it in slightly acceleration. Sometimes I will deaccelarate a little and it will stop.
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Post by Stinger on Mar 25, 2015 12:22:33 GMT -5
Hmm, that's an odd one. I would have suspected a lean condition but 15.7 isn't really lean enough to cause surging in most cases.
Can you get a video of this happening by chance?
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Post by Hueneme805 on Mar 25, 2015 14:07:57 GMT -5
Will do
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Post by Hueneme805 on Mar 26, 2015 19:50:35 GMT -5
This is from this morning at 3000 rpm or so speed of 55-60 mph. Notice how my AFR gauge goes back n fourth, thats when the car is surging/surging.
Stinger performance.3gp
If you don't or can't see video clip please reply. Thanks again.
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Post by Stinger on Mar 26, 2015 22:36:53 GMT -5
I can't see any clip, you'll need to upload it to Youtube, photobucket, or a file sharing service.
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Post by Hueneme805 on Mar 26, 2015 22:53:51 GMT -5
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Post by Stinger on Mar 26, 2015 23:52:58 GMT -5
Got an FMIC? Got a BOV?
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Post by Hueneme805 on Mar 27, 2015 7:59:27 GMT -5
Yes I have both. Your fmic and a plastic bosch bov that I dump back into turbo.
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Post by Hueneme805 on Mar 27, 2015 8:14:46 GMT -5
You thinking it might be a vacuum leak?
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Post by Stinger on Mar 27, 2015 10:54:28 GMT -5
Does it do it worse if you build boost (5psi or more) in a high gear and then lightly back off the throttle (rather than slam throttle shut)?
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Post by Hueneme805 on Mar 27, 2015 12:03:54 GMT -5
Its never done it in boost only in no boost in regular driving speeds. When it does happen I either give it gas or let off. Only in 4th and 5th gear in the same RPM and in between 55-65 mph.
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Post by Stinger on Mar 27, 2015 14:26:04 GMT -5
I'm going to say it's "trailer hitching" which is related to the VAM and the amount of air volume between the VAM and engine.
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Post by Hueneme805 on Mar 27, 2015 19:54:32 GMT -5
So what should I start checking or diagnose ? Is there a way to convert to mass air flow instead of a vam?
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