Surging with Donaldson cold air
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Joined: Nov 2001
Posts: 51
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From: Scottsdale AZ
Surging with Donaldson cold air
I recently installed the Donaldson air cleaner and cold air shroud on my '02 LS1 with AT. I am experiencing an annoying surging at 1500 rpm under light load and light throttle conditions. Has anyone else had this problem? How was it fixed? Thanks to any who can help...
[Modified by gjpundsack, 7:48 AM 12/10/2001]
[Modified by gjpundsack, 7:48 AM 12/10/2001]
Le Mans Master
Joined: Apr 1999
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From: Burlington ON
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Re: Surging with Donaldson cold air (vettenuts)
I never had any problems with the Donaldson Cold Air Cover on my car when I ran it. However, we had a few customers that had the same problems so we stopped carrying the cold air lids. I think it has something to do with turbulant air crossing the wires of the MAF. Make sure that cover is sealed to the shroud real good or you will get air leaking in from under the hood. You do not want this happening because then you have high pressure air entering the filter from beneath the shroud and low pressure air entering from under the hood which can mess up your MAF's air metering.
[Modified by MattG, 8:24 AM 12/10/2001]
[Modified by MattG, 8:24 AM 12/10/2001]
Le Mans Master
Joined: Oct 1999
Posts: 8,205
Likes: 40
From: Tucson AZ
Re: Surging with Donaldson cold air (gjpundsack)
I think it is all that "dry air" up there in Scottsdale.... Seriously, I think Matt is probably right. Good luck. On another note, someone once posted that his surging improved after he did a computer re-learn. Sounds unlikely, but it might be worth a try. :D
Pro
Joined: Apr 2001
Posts: 672
Likes: 1
From: Scottsdale AZ
Re: Surging with Donaldson cold air (gjpundsack)
The surging we had was resolved by increasing fuel pressure. It is a very lean surge, low/no throttle. In our case, it was most noticable when driving with cruise control on and going over a hill, almost any size hill that causes the CC to "let up" on the throttle.
Boosted fuel pressure back to 60# and 99.5% of the surging is gone.
Good Luck, it is really fustrating!
Boosted fuel pressure back to 60# and 99.5% of the surging is gone.
Good Luck, it is really fustrating!
Instructor
Joined: Jun 2000
Posts: 204
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From: Pacific Palisades CA
Re: Surging with Donaldson cold air (jimhild)
Saw another "fix" which was: to put the MAF screen back in. Did you take your's out? As I recall, others had the Donaldson and the cold air lid with surging problems. They put the screen back in the MAF and it was fixed.
I have the Donaldson with the lip and have experienced some "light" surging. Not enough for me to remedy however.
I have the Donaldson with the lip and have experienced some "light" surging. Not enough for me to remedy however.
Melting Slicks
Joined: Aug 2000
Posts: 2,248
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From: Newland US
Re: Surging with Donaldson cold air (gjpundsack)
gjpundsack,
Surging is usually indicative of a lean condition. Check to make sure there are no vacuum leaks associated with the induction tube....especially around the MAF and Throttle Body. Things may improve as you drive it and it relearns.
Good luck.
Mark
Surging is usually indicative of a lean condition. Check to make sure there are no vacuum leaks associated with the induction tube....especially around the MAF and Throttle Body. Things may improve as you drive it and it relearns.
Good luck.
Mark
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Team Owner
Joined: Sep 2001
Posts: 23,283
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From: Lake Elsinore, CA
Re: Surging with Donaldson cold air (Phantom1000)
I don't have the Donaldson but I did install the Twin-Flow Intake a few weeks ago on my 2002 coupe. (I also slept at a Holiday Inn last night. :jester )
I'd heard of surging problems on '01-'02's with aftermarket intake systems and was expecting to have the same. I didn't. I left my MAF screen in and did an idle relearn. Perfect so far.
Ed
I'd heard of surging problems on '01-'02's with aftermarket intake systems and was expecting to have the same. I didn't. I left my MAF screen in and did an idle relearn. Perfect so far.
Ed
Supporting Vendor
Joined: Jan 2000
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From: TX
Cruise-In I Veteran
St. Jude Contributor '04
Re: Surging with Donaldson cold air (gjpundsack)
Gary, please give us a call and we will (while driving) Autotap your car.
Surging because of the cold air cover on a Blackwing is ridiculous. :lol:
Lean condition causing surging is a possibilty. If we can get Gary to come in, we will post our findings to the forum.
Nate
Surging because of the cold air cover on a Blackwing is ridiculous. :lol:
Lean condition causing surging is a possibilty. If we can get Gary to come in, we will post our findings to the forum.
Nate
Instructor
Joined: Jun 2000
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From: Pacific Palisades CA
Re: Surging with Donaldson cold air (C5North)
Doug Rippie himself told me to take the screen off the MAF with the Donaldson.
Race Director
Joined: Aug 2000
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From: HOPE is the first step on the road to disappointment.
Re: Surging with Donaldson cold air (Phantom1000)
Doug Rippie himself told me to take the screen off the MAF with the Donaldson.
Doug Rippie.......himself.........interesting ...........there seems to be a conflict of opinion at DRM..........so do you have the surging with the cold air lip?
Doug Rippie.......himself.........interesting ...........there seems to be a conflict of opinion at DRM..........so do you have the surging with the cold air lip?
Racer
Joined: Apr 2000
Posts: 333
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From: Central NJ
Re: Surging with Donaldson cold air (C5North)
The 2 causes I've heard of is an air leak (check all connections carefully) or removing the MAF screens. I did have surging when I used a ported MAF with the screens removed. I've since put the stock MAF back in and no longer have any surging.
