| 2004-2007 Cadillac CTS-V General Discussion Discuss everything about the first generation Cadillac CTS-V that does NOT fall into either the Performance or Appearance Modification category. | Cadillac Forums: Throttle surge 
09-16-08, 05:36 AM
| | Cadillac Owners Fanatic Cadillac(s): 2004 CTS-V  | | Join Date: Mar 2008 Location: Vegas | | | Throttle surge
Shortly after putting on a ported TB, I've had a peculiar throttle surge. When the clutch is fully released in nuetral and coasting, RPM's sometimes race away between 1200-2800 range. Happens quite frequently on a steep mountain grade descents. When I push in the clutch, it goes back to idle. It does it with AC on or not. Seems to happen at any operating temp, just sort of random. Once I come to a stop of less than 3mph or so it goes back to regular idle. Anybody know what the problem might be? Your guys'es input would be greatly appreciated as always! |
09-16-08, 08:08 AM
|  | Cadillac Owners Connoisseur Cadillac(s): '05 CTS-V, '00 SLS, 98 SLS, 89 Eldo, '80 Eldo | | Join Date: Mar 2006 Location: NYC Age: 38 | | | Re: Throttle surge
Be happy you don't have a Maggie. The whole car suges 
J/K
Ckeck for an air leak. Incenss (spelling?) is a good smoke maker.
Tony
__________________ '05 Platinum l LPE CAI l Magnaflow l V1 (hardwired), w/ custom mount l UUC shifter w/Lindsay bushings l UUC leather shift knob l K9 GEAR rear seat cover l CruiseCam l HID fogs l Falken RT-615s l Hotchkis sways W/Z06 end links l Billet A/C vent knobs l Hawk HP+/HPS l CG-Lock l Specter Werkes Bushings l Noah Custom cover l FG2s l Ground control 550/600 l MAGGIE 436RWHP/ 412RWTQ (Dynojet) l Heavys fire extinguisher bracket l Intercepter scan-gauge l Billet pedals l Meth l NO HEADERS  |
09-16-08, 09:51 AM
| | Cadillac Owners Connoisseur Cadillac(s): 2005 CTS-V, 2005 Escalade EXT, 2007 Escalade EXT | | Join Date: Apr 2007 Location: Sandbox, Kuwait | | | Re: Throttle surge
What was the final dia the TB was ported to. Looks like you may have a small air leak at the point the TB meets the intake manifold...OR your worse case is because you ported the TB the cracker / follower need tunin...
At idle when you turn on your accessories, just it also surge or only durin motion? If only during motion it is your Cracker / follower
Try also revvin over 2500rpm at a stand still and see how it drops back to idle. |
09-16-08, 04:50 PM
| | Cadillac Owners Fanatic Cadillac(s): 2004 CTS-V | | Join Date: Mar 2008 Location: Vegas | | | Re: Throttle surge
It only has the problem only in motion. The ported TB is just the cheapy off of EBAY from that place in Oregon. Thanks again guys, now I just need to look up what cracker/follower is (not to inclined on the fuel delivery side, or any side for that matter). |
09-16-08, 05:16 PM
|  | Cadillac Owners Enthusiast Cadillac(s): 2007 CTS-V | | | | | Re: Throttle surge
Quote:
Originally Posted by vegasVowner  It only has the problem only in motion. The ported TB is just the cheapy off of EBAY from that place in Oregon. Thanks again guys, now I just need to look up what cracker/follower is (not to inclined on the fuel delivery side, or any side for that matter). | Mine did the same thing after porting the TB. If you insist on getting rid of it, you need to adjust the Adaptive Idle Airflow parameters and/or idle spark timing at idle. I adjusted the Idle Proportional Airflow for coastdown and cured most of the issue. Since you ported the TB, you changed the airflow and need to adjust the parameters to match. The rpm's are dropping below the desired idle and the computer is compensating with the Adaptive Proportional airflow and now you actually have more airflow than the computer thinks. It's really simple if you have tuning software or take it and have a tune done somewhere.
Last edited by PISNUOFF; 09-16-08 at 05:23 PM.
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09-16-08, 11:12 PM
| | Cadillac Owners Connoisseur Cadillac(s): 2005 CTS-V, 2005 Escalade EXT, 2007 Escalade EXT | | Join Date: Apr 2007 Location: Sandbox, Kuwait | | | Re: Throttle surge
The cracker and follower are two terms the PCM use to keep the engine runnin while in motion. At idle the vehicle doesnt need any power but once in motion the engine needs a little more airflow to keep the engine from dying...So the Throttle plate compensates slightly so more air gets in to keep the rpm above 750/500...
But i would also listen to PISNUOFF. He has you going in the right direction...I forgot the idle air correction on the side...I swapped my stock tb for a LS2...Less calibration, less headaches, so i thought.... | | Cadillac Discussion Tools | | | 
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