01 Cobra surges until WOT...sometimes.

1rnkpny · September 18th, 2009, 04:04 PM

Originally Posted by Renegaderacer

not being a dick but cars dont suffer from the same issues as they use to from ethanol because most gas has it they design them to take it i run it in mine and race mine all the time runs like a charm! All my cars do and have, mabe you've just bought alot of bad gas.....

These are customer vehicles that I've seen it on. The fuel they were using had too much ethanol in it, would caused the injectors to gum up and clog causing hesitation and surging. It had also been known to plug the fuel filters. 1996 and newer vehicles.

And no, you're not being a dick.

MDK210 · September 18th, 2009, 07:10 PM

MAAAANNN that thing didn't do shit! WTF! If something is seriously messed up I'm going to be super pissed! Tune day is tomorrow so maybe Mike can figure this shit out!

MDK210 · September 18th, 2009, 07:37 PM

Originally Posted by Trick Tuners

It sounds like the returnless fuel system hesitation issue. There were a bunch of good threads on modfords in the terminator section. It can be tuned out most of the time. Adding the KB disk will help, as well as removing the pprv. If you can datalog, log the FRPS and see if you get a massive FP spike on "let off", and a dip when you get on it. You can test it by going wot, full let off in gear, and then punch it.
Fuel Pressure and the FRPS - Trick Tuners Forums
The PPRV - Trick Tuners Forums

I'll tell you right now if I go WOT, let off then punch it again she'll do the same shit. The FP gauge does show that she spikes after going high in the RPM range on any gear then letting off but I assumed that was normal due to the computer having to recalculate the amount of fuel required now.

Trick Tuners · September 18th, 2009, 07:41 PM

You really need to see the frps data instead of rail gauge pressure. The frps is pressure compensated and the gauge is not. Talk to your tuner and they can probably dial out the issue.

MDK210 · September 18th, 2009, 07:55 PM

Originally Posted by Trick Tuners

You really need to see the frps data instead of rail gauge pressure. The frps is pressure compensated and the gauge is not. Talk to your tuner and they can probably dial out the issue.

Yeah saw the thread made in the other forum that you linked. I just find it nuts that this thing was previously tuned by Jon Lund and it doesn't run at its full potential. How could it ever have gotten dyno like this. It was 2yrs ago and another owner so who knows. I'll take the knowledge of the PSI in the other thread and let me tuner know if he doesn't already. Will blow my mind if a tune fixes her! Thanks.

BTW think I should take out the little disc before it gets tuned?

MDK210 · September 19th, 2009, 08:30 PM

problem fixed! Was the damn tune! Mike is a flipping great tuner I didn't even have to tell him about upping the timing or anything he just tuned it right. He couldn't get out all of my low rpm surging because of the way my MAF is setup but it sure feels like it to me! It's pretty funny to how much he hates not being able to get that last little surging out but IMO it's fixed. My WOT is fixed also and I beat a naked 600 bike on the 1hr30min drive back, lol. We took it directly to a dynojet shop in the local area and heat soaked I made 453rwhp/420rwtq@6100rpm! Mike didn't want to take it any higher on her first run out but Monday I will let her go to 6500 or whatever they usually run at. The Cobra that was before me was also tuned by Mike and he normally runs 500rwhp but made 452rwhp today after he drove 30 min on his roots blower. Pretty crazy what heat soak can do to a motor. Point is I make 452rwhp all damn day long! I'm taking the Cobra back Monday to get a not so heat soaked #, Mike is looking for close or over the 500rwhp range! BRING IT ON!

18 degree timing, 11psi

1rnkpny · September 19th, 2009, 08:37 PM

Glad you got it taken care of.

Trick Tuners · September 21st, 2009, 03:26 PM

Nice numbers! Glad you got it fixed.

September 18th, 2009, 07:10 PM	#22
MDK210 Newbie 2001 SVT Cobra Join Date: Jul 2009 Location: Hampton, VA Posts: 49 iTrader: 0 reviews	MAAAANNN that thing didn't do shit! WTF! If something is seriously messed up I'm going to be super pissed! Tune day is tomorrow so maybe Mike can figure this shit out! __________________ 2008 F150 5.4l Roushcharged: http://s330.photobucket.com/albums/l...0F150%20Roush/ 2001 SVT Cobra 4.6l Procharged: http://s330.photobucket.com/albums/l...20SVT%20Cobra/

September 18th, 2009, 07:41 PM	#24
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,471 iTrader: 3 reviews	You really need to see the frps data instead of rail gauge pressure. The frps is pressure compensated and the gauge is not. Talk to your tuner and they can probably dial out the issue. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

September 19th, 2009, 08:30 PM	#26
MDK210 Newbie 2001 SVT Cobra Join Date: Jul 2009 Location: Hampton, VA Posts: 49 iTrader: 0 reviews	problem fixed! Was the damn tune! Mike is a flipping great tuner I didn't even have to tell him about upping the timing or anything he just tuned it right. He couldn't get out all of my low rpm surging because of the way my MAF is setup but it sure feels like it to me! It's pretty funny to how much he hates not being able to get that last little surging out but IMO it's fixed. My WOT is fixed also and I beat a naked 600 bike on the 1hr30min drive back, lol. We took it directly to a dynojet shop in the local area and heat soaked I made 453rwhp/420rwtq@6100rpm! Mike didn't want to take it any higher on her first run out but Monday I will let her go to 6500 or whatever they usually run at. The Cobra that was before me was also tuned by Mike and he normally runs 500rwhp but made 452rwhp today after he drove 30 min on his roots blower. Pretty crazy what heat soak can do to a motor. Point is I make 452rwhp all damn day long! I'm taking the Cobra back Monday to get a not so heat soaked #, Mike is looking for close or over the 500rwhp range! BRING IT ON! 18 degree timing, 11psi __________________ 2008 F150 5.4l Roushcharged: http://s330.photobucket.com/albums/l...0F150%20Roush/ 2001 SVT Cobra 4.6l Procharged: http://s330.photobucket.com/albums/l...20SVT%20Cobra/ Last edited by MDK210; September 20th, 2009 at 06:11 PM.

September 19th, 2009, 08:37 PM	#27
1rnkpny Hardcore Enthusiast 2007 G9 Eye Catcher Join Date: Mar 2009 Location: Calgary, Alberta Posts: 1,900 iTrader: 0 reviews	Glad you got it taken care of. __________________

September 21st, 2009, 03:26 PM	#28
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,471 iTrader: 3 reviews	Nice numbers! Glad you got it fixed. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

Remove Advertisements Sponsored Links
Forums at Modded Mustangs Advertisement Advertisement

Threads Similar to: 01 Cobra surges until WOT...sometimes.
Thread	Thread Starter	Forum	Replies	Last Post
Surges	94blakonblak	94-95	10	June 26th, 2009 10:21 PM
20 ft. Storm Surges...	Dansby	The Clubhouse	56	September 13th, 2008 09:09 PM
99 stang surges when put in gear, or with ac on	dobermean	99-04	7	August 16th, 2007 07:30 PM
My 96 Cobra Runs like a Powerstroke at WOT High RPM	Ryan Paymaster	Modular Mustangs	9	June 25th, 2007 03:29 PM
Engine surges at start and idle fluctuates	200KMILES	V6 Mustangs	2	May 3rd, 2006 06:23 PM

All times are GMT -4. The time now is 06:01 PM.
Contact Us - Modded Mustangs - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.