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Cammed C5 stalling at idle

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Old Aug 21, 2008 | 11:26 PM
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Default Cammed C5 stalling at idle

Hey guys, recently had a small cam installed and the car stalls at idle. Car also has LT headers and vararam. Car has been dyno tuned with street tuning and the installer/tuner is going to work at it some more. Cam is a Comp cam 224/224 @112 LSA with.581 lift. Generally driveability seems good other than the idle problem. Is this a difficult cam to tune? Any suggestions on what need to be corrected in the tune?

Thanks so much,

Tim
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Old Aug 22, 2008 | 01:12 AM
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You'll need to drill a small hole in the butterfly on the throttlebody. It's a common problem with cammed C5's. About 50% are able to compensate, the other 50% need to be drilled.
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Old Aug 22, 2008 | 01:21 AM
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What stall converter are you using?
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Old Aug 22, 2008 | 08:26 AM
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Never heard of anyone needing to drill the throttle blade on a C5, tune should take care of it. How much time did the tuner spend on the street with the car? My tuner usually spends between and hour and and hour and a half on the street nailing down driveability issues and the street tune.


However, part of the fix may be raising idle but with an A4 you are then fighting the converter. As hinted to above, you may need a little looser converter to correct this.
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Old Aug 22, 2008 | 08:32 AM
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Go to a professional tuner with references. Any tuner that cant get your car running properly in one sitting and needs to "work at it some more" is someone to run (not walk) away from.

Thats my 2cents.
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Old Aug 22, 2008 | 10:04 AM
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Originally Posted by 97C5owner
You'll need to drill a small hole in the butterfly on the throttlebody. It's a common problem with cammed C5's. About 50% are able to compensate, the other 50% need to be drilled.
Not anymore with the new software available.
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Old Aug 22, 2008 | 12:13 PM
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A good tuner should be able to fix this in short order. Do not drill any holes in the butterfly valve. Good luck with it.
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Old Aug 22, 2008 | 01:18 PM
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HI:

It's all in the tune. You need to have the Idle timing changed as well as the RAF tweeked a little bit and she will be fine.

Chris
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Old Aug 22, 2008 | 01:21 PM
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Bigger cams like mo timing at idle.
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Old Aug 22, 2008 | 05:30 PM
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Thanks for the replies, hopefully i get it nailed down on the next try.
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Old Aug 22, 2008 | 06:32 PM
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Take it to a good tuner and DO NOT DRILL THE TB. It's all in how long the tuner wants to spend and how much experience they have.. it can be done
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Old Aug 22, 2008 | 08:11 PM
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This isnt 1973 do not drill holes in your car.


You paid the money to get the performance parts so finish the job and Pay some money do it right and get it tuned by a pro


Doug at ECS had my car tuned with that same cam TSP 224R with XER lobes tuned in roughly 15min. I can put around town with my ac on max and it never once has given me any problems at all

Last edited by kingsey; Aug 22, 2008 at 08:13 PM.
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Old Aug 22, 2008 | 08:14 PM
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Originally Posted by Ikester
Not anymore with the new software available.
MTI drilled my TB after the H/C install because we were having some stalling issues on my A4 car. It worked to correct the problem but the car DOES want to take off and is harder to stop. Can this problem be corrected with a simple tune now??? How long has this software been available??

This install was done appx 8mos ago. I would have thought that Jason would have been up to par with the latest software available to correct this problem. Especially with the volume of H/C cars that CAME thru that shop. I must say I am disappointed to hear there were other more drivable options available....
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Old Aug 22, 2008 | 08:21 PM
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Originally Posted by 97C5owner
MTI drilled my TB after the H/C install because we were having some stalling issues on my A4 car. It worked to correct the problem but the car DOES want to take off and is harder to stop. Can this problem be corrected with a simple tune now??? How long has this software been available??

This install was done appx 8mos ago. I would have thought that Jason would have been up to par with the latest software available to correct this problem. Especially with the volume of H/C cars that CAME thru that shop. I must say I am disappointed to hear there were other more drivable options available....
MTI Atlanta? I can't believe they would drill a TB anymore....
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Old Aug 22, 2008 | 10:57 PM
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Originally Posted by 97C5owner
MTI drilled my TB after the H/C install because we were having some stalling issues on my A4 car. It worked to correct the problem but the car DOES want to take off and is harder to stop. Can this problem be corrected with a simple tune now??? How long has this software been available??

This install was done appx 8mos ago. I would have thought that Jason would have been up to par with the latest software available to correct this problem. Especially with the volume of H/C cars that CAME thru that shop. I must say I am disappointed to hear there were other more drivable options available....
Didn't MTI in Houston close its' doors?
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Old Aug 22, 2008 | 11:10 PM
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Originally Posted by 97C5owner
MTI drilled my TB after the H/C install because we were having some stalling issues on my A4 car. It worked to correct the problem but the car DOES want to take off and is harder to stop. Can this problem be corrected with a simple tune now??? How long has this software been available??

This install was done appx 8mos ago. I would have thought that Jason would have been up to par with the latest software available to correct this problem. Especially with the volume of H/C cars that CAME thru that shop. I must say I am disappointed to hear there were other more drivable options available....
MTI did my X1 cam/Stage II head install and runs perfect on my 01 C5. I install Kooks 1 7/8 headers with Corsa indy cat backs. Needed to go with a 3800 stall converter. It lopes low a bit on warm engine start ups but rarely dies. 435 rwhp. Never drill anything on the TB.

My 2 cents...
Darrell
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Old Aug 22, 2008 | 11:10 PM
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I'm not drillin anything on the car.
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To Cammed C5 stalling at idle

Old Aug 22, 2008 | 11:58 PM
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but it works, ive done it before on other cammed cars.

.002

- Kons
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Old Aug 23, 2008 | 01:15 AM
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Originally Posted by 01texasC5
MTI did my X1 cam/Stage II head install and runs perfect on my 01 C5. I install Kooks 1 7/8 headers with Corsa indy cat backs. Needed to go with a 3800 stall converter. It lopes low a bit on warm engine start ups but rarely dies. 435 rwhp. Never drill anything on the TB.

My 2 cents...
Darrell
MTI Houston. I stood there and watched them do it. My first post in this thread was the explanation they gave me. They did recomend a stall if I went with a more radical cam. And yes, they are no longer in the perf mod business.
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Old Aug 23, 2008 | 07:30 AM
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Originally Posted by motogib1
Hey guys, recently had a small cam installed and the car stalls at idle. Car also has LT headers and vararam. Car has been dyno tuned with street tuning and the installer/tuner is going to work at it some more. Cam is a Comp cam 224/224 @112 LSA with.581 lift. Generally driveability seems good other than the idle problem. Is this a difficult cam to tune? Any suggestions on what need to be corrected in the tune?

Thanks so much,

Tim
I am running a TSP 224/224 581/581 114 and I tuned it with HPTuners.Tell your tuner he needs to adjust the Base Runnig Airflow table.It has to parts to adjust P/N and in gear. If he needs to look at my table and how to adjust it PM me. My car idles about like stock!
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