03 gt woes - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 03-08-2014, 06:06 PM   #1
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
03 gt woes

Recently got into mustangs...but not to automotive performance.

Recently bought an 03 gt with a leaking intake manifold...

I replaced that with a new frpp manifold.

Before the swap I had a condition where it would stumble at idle a little, then during wot pulls it would act as if it were starving for fuel.

I really figured the leak was soaking a plug or two causing a misfire. I blew the plug bores out with air when I had the Mani off and got some liquid out of a couple.

I put it all back together and everything went smoothly. I replaced the gasket on the IAC simply because the ford store didn't have a valve on the shelf.

Long story short, with the new intake and dry plugs, I've still got a stumble at idle, which according to my live wire, is around 680-710rpm.

Anyone wanna guide me to a starting point? Are these 2v coils known for breaking up?

I have several k$ worth of diagnostic tools, but I don't have an IDS, so I can view most anything, just can't flash.

Any advice is welcomed.

Thanks

Adam



sent while driving recklessly
adamv7010 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-08-2014, 07:08 PM   #2
WJL
Registered Member
Regular
 
Join Date: Jan 2014
Location: Pittsburgh
Region: Pennsylvania
Posts: 285
Is it just at idle, how's it run at other wise?
WJL is offline   Reply With Quote
Old 03-08-2014, 07:10 PM   #3
slow281
Regular
Supporter
 
sixpac's Avatar
 
Join Date: Mar 2012
Location: Cedar Rapids
Region: Nebraska
Posts: 3,162
Coils arnt really prone to going out but it's a possibility.. Maybe try some fuel injector cleaner or seafome.. Did you put new plugs? And are your boots to the coils in goo shape?
__________________
Need more Horsepower? Add a sticker. Contact me for vinyl stickers pre-made and custom!
Stick on Horsepower <- Click Here and like my Page!
2001 GT - True Blue
2003 V6 - Zinc Yellow
1990 LX 2.3 - project
sixpac is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-08-2014, 07:27 PM   #4
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by WJL View Post
Is it just at idle, how's it run at other wise?
Like i said in my op, it isnt 100% correct at any rpm...it acts starved for fuel during wot runs and kinda stumbles for a second then picks back up.





Quote:
Originally Posted by sixpac View Post
Coils arnt really prone to going out but it's a possibility.. Maybe try some fuel injector cleaner or seafome.. Did you put new plugs? And are your boots to the coils in goo shape?
Plugs are new. Like I said in my op, I had an intake leak and saturated a couple boots so I won't say they're 100%

None of them looked cracked or split.


sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-08-2014, 08:47 PM   #5
Registered Member
Regular
 
Roguestang's Avatar
 
Join Date: Nov 2011
Location: Tampa
Region: Florida
Posts: 1,516
The cops can crack and the boots can rot out over time, but you would notice that if you pulled them out. Did you clean the IAC while it was off the car? If not I would try that. And the MAF just incase.

Just thinking outloud here, but did you ever disconnect the battery and see if the ecu can relearn the curve?
__________________
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3

***resident gun idiot***
Roguestang is offline   Reply With Quote
Old 03-08-2014, 08:57 PM   #6
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by Roguestang View Post
The cops can crack and the boots can rot out over time, but you would notice that if you pulled them out. Did you clean the IAC while it was off the car? If not I would try that. And the MAF just incase.

Just thinking outloud here, but did you ever disconnect the battery and see if the ecu can relearn the curve?
I cleaned the IAC and put a new gasket on...only reason I didn't replace it was because noone has one on the shelf here but ford had gaskets so I just threw a new on one.

I did not clean the maf. And that brings a new thought to mind.. the car has a cheap *** cai on it where the filter is still under the hood in the bay and not in the fender. The op put that on. I have a new better one in a box waiting to go on.

Yes the battery was out of the car for a couple days after I tore it apart while I was waiting on a replacement intake.

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-08-2014, 09:16 PM   #7
Registered Member
Regular
 
Roguestang's Avatar
 
Join Date: Nov 2011
Location: Tampa
Region: Florida
Posts: 1,516
Well there goes those ideas...lol

Its possible the maf might be getting a disturbance of air from where the air filter sits if its close to the maf. I had that issue on my fox.
__________________
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3

***resident gun idiot***
Roguestang is offline   Reply With Quote
Old 03-08-2014, 09:21 PM   #8
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by Roguestang View Post
Well there goes those ideas...lol

Its possible the maf might be getting a disturbance of air from where the air filter sits if its close to the maf. I had that issue on my fox.
Tomorrow I'm going to hook up my OTC tool and monitor spark on each cylinder at any given rpm and go from there. After thinking about it it could be a misfire in the upper rpm

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-08-2014, 09:25 PM   #9
Registered Member
Regular
 
Roguestang's Avatar
 
Join Date: Nov 2011
Location: Tampa
Region: Florida
Posts: 1,516
Sounds like a plan!
__________________
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3

***resident gun idiot***
Roguestang is offline   Reply With Quote
Old 03-08-2014, 11:02 PM   #10
Registered Member
Regular
 
Mfore33's Avatar
 
Join Date: Feb 2012
Location: Murfreesboro
Region: Tennessee
Posts: 540
Maybe bad egr valve?
Mfore33 is offline   Reply With Quote
Old 03-08-2014, 11:10 PM   #11
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by Mfore33 View Post
Maybe bad egr valve?
Would that cause the issues in the upper rpm range though?

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-08-2014, 11:12 PM   #12
Registered Member
Regular
 
Roguestang's Avatar
 
Join Date: Nov 2011
Location: Tampa
Region: Florida
Posts: 1,516
No it wouldn't
__________________
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3

***resident gun idiot***
Roguestang is offline   Reply With Quote
Old 03-08-2014, 11:20 PM   #13
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
These fukers are so much harder to troubleshoot than the diesels I'm used to. Lol

With a diesel there's only about 4 possibilities to rule out before its a hard part failure.

Damn gas engines lol

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-09-2014, 06:24 PM   #14
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
I cleaned the maf a little today. I didn't have any elec cleaner so I used a little carb cleaner and blew it out w air.

That made a good difference in the unresponsiveness. It still has a rough idle/stumble around 1k rpm while sitting still. Any ideas?

It seems to run better in normal driving and wot conditions now.

I do think the maf is seeing a bit of turbulence due to the design of the eBay cai the previous owner put on...pics attached...but that will be gone soon. I have a new better one from late model that has a bend and some straight pipe before the maf sensor.


Anyone wanna take a stab at the rough condition at and around 1k rpm?

Rail pressure is around 42psi.
sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-09-2014, 06:50 PM   #15
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Click image for larger version

Name:	uploadfromtaptalk1394409025946.jpg
Views:	67
Size:	54.5 KB
ID:	150134

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-09-2014, 07:11 PM   #16
Registered Member
Regular
 
Roguestang's Avatar
 
Join Date: Nov 2011
Location: Tampa
Region: Florida
Posts: 1,516
Swap the better cai on and that should make the difference
__________________
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3

***resident gun idiot***
Roguestang is offline   Reply With Quote
Old 03-09-2014, 07:28 PM   #17
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by Roguestang View Post
Swap the better cai on and that should make the difference
That's what I'm thinking. It may not clean it up 100% but it'll make a good difference I think.

It should lessen the velocity the maf sees.

There's a reason ebay mess is cheaper

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-10-2014, 09:55 AM   #18
Registered User
Newbie
 
Join Date: Mar 2014
Location: Poughkeepsie
Region: New York
Posts: 8
try replacing the IAC valve? also, what about your TPS (Throttle Position Sensor)

and you should be getting codes... dont understand what you meant by having diagnostic tools/not being able to flash??

if cannot read codes, possibly look at/swap around plugs (checked gaps??!) and cop's. and what about fuel injectors? check connections on those.

good luck. let us know what you find-
Mach1Now is offline   Reply With Quote
Old 03-10-2014, 09:59 AM   #19
Registered User
Newbie
 
Join Date: Mar 2014
Location: Poughkeepsie
Region: New York
Posts: 8
oh... one more thing! my favorite fuel additive- Lucas Upper Cylinder Lubricant
Mach1Now is offline   Reply With Quote
Old 03-10-2014, 02:57 PM   #20
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by Mach1Now View Post
try replacing the IAC valve? also, what about your TPS (Throttle Position Sensor)

and you should be getting codes... dont understand what you meant by having diagnostic tools/not being able to flash??

if cannot read codes, possibly look at/swap around plugs (checked gaps??!) and cop's. and what about fuel injectors? check connections on those.

good luck. let us know what you find-
Injector & cop connections are good.

I have pretty extensive diagnostic software, buy don't have fords factory software, IDS. Which would allow reflashing the ecm to stock parameters, which would clear any inconsistencies from prior tuning etc etc. I do have GM's tech software which allows reflashing ecm and TCM components.

I haven't replaced the IAC, would that cause issues above idle rpms?

Tps is within OEM spec

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-10-2014, 03:55 PM   #21
Registered Member
Regular
 
Roguestang's Avatar
 
Join Date: Nov 2011
Location: Tampa
Region: Florida
Posts: 1,516
An iac could cause it to stumble on acceleration if the valve gets hung up (from carbon build up) or stuck open or closed. But usually cleaning it out will fix the issue (maybe temporarily) unless its an electrical, or mechanical issue.
__________________
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3

***resident gun idiot***
Roguestang is offline   Reply With Quote
Old 03-10-2014, 04:34 PM   #22
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by Roguestang View Post
An iac could cause it to stumble on acceleration if the valve gets hung up (from carbon build up) or stuck open or closed. But usually cleaning it out will fix the issue (maybe temporarily) unless its an electrical, or mechanical issue.
That's what I was thinking as well. Like I said earlier in the thread , I cleaned it good with brake & carb cleaner about 10 miles before I replaced the intake and that temporarily fixed the rpm hanging for the most part.

I'll replace it in a couple days when I get home before midnight. Lol.

I haven't decided what exactly I'm going to do with the car, so I'm not sure how deep I want to get into it. It will likely be painted & sold after I get it running right. But who knows...it only has 115k miles and a near perfect interior so there's a lot of value left in her.



sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-10-2014, 06:18 PM   #23
Registered Member
Regular
 
Roguestang's Avatar
 
Join Date: Nov 2011
Location: Tampa
Region: Florida
Posts: 1,516
Yeah sounds like a nice car. Got some pics other than of the ghetto cai? Lol
__________________
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3

***resident gun idiot***
Roguestang is offline   Reply With Quote
Old 03-10-2014, 06:35 PM   #24
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by Roguestang View Post
Yeah sounds like a nice car. Got some pics other than of the ghetto cai? Lol
Click image for larger version

Name:	uploadfromtaptalk1394494398844.jpg
Views:	92
Size:	126.2 KB
ID:	150247Click image for larger version

Name:	uploadfromtaptalk1394494408964.jpg
Views:	94
Size:	60.2 KB
ID:	150248Click image for larger version

Name:	uploadfromtaptalk1394494422817.jpg
Views:	87
Size:	73.2 KB
ID:	150249Click image for larger version

Name:	uploadfromtaptalk1394494481163.jpg
Views:	101
Size:	56.1 KB
ID:	150250

Last is dirtyyyyy lol

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-10-2014, 06:54 PM   #25
Registered Member
Regular
 
Roguestang's Avatar
 
Join Date: Nov 2011
Location: Tampa
Region: Florida
Posts: 1,516
Looks good! I could actually see a two tone paint job with the top half beimg silver on the blue. It could get alittle lower, but its a nice clean car none the less

---------- Post added at 06:54 PM ---------- Previous post was at 06:54 PM ----------

Oh and a Mach 1 grill delete lol
__________________
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3

***resident gun idiot***
Roguestang is offline   Reply With Quote
Old 03-10-2014, 07:44 PM   #26
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by Roguestang View Post
Looks good! I could actually see a two tone paint job with the top half beimg silver on the blue. It could get alittle lower, but its a nice clean car none the less

---------- Post added at 06:54 PM ---------- Previous post was at 06:54 PM ----------

Oh and a Mach 1 grill delete lol
I actually thought of doing the hood trunk and top a bright silver over the blue...but it would probably limit my potential buyer pool

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Old 03-10-2014, 08:00 PM   #27
Road Trip!
 
Join Date: Jan 2014
Posts: 688
Quote:
Originally Posted by adamv7010 View Post
Attachment 150247Attachment 150248Attachment 150249Attachment 150250

Last is dirtyyyyy lol

sent while driving recklessly

What the..

THATS WHERE MY HOOD WENT!
Thief lol


Sent from my Barbie Dream Phone®
CoolHorsey is offline   Reply With Quote
Old 03-10-2014, 08:40 PM   #28
Registered Member
Regular
 
Join Date: Mar 2014
Posts: 21
Quote:
Originally Posted by CoolHorsey View Post
What the..

THATS WHERE MY HOOD WENT!
Thief lol


Sent from my Barbie Dream Phone®
Lol the previous owner did that so I can't say for sure if it is or not Lol

Where you located?

sent while driving recklessly
adamv7010 is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1996-2004 Mustang GT

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
VIDEO: 617HP Supercharged Mustang GT Tears Up Our Dyno! AMDanBailer AmericanMuscle 8 02-24-2014 04:19 PM
Dropping in a 2000 gt motor Blackedout Pre-2005 V6 Mustang 20 02-07-2012 10:48 PM
2005 Mustang GT 350 Tribute Car (Mineral Grey Lovers) 2K05GT Pictures and Videos 8 02-01-2012 05:43 AM
1966 Ford Mustang GT Fastback Raffle to Protect Children jdipietro ME Site Help & Announcements 1 07-01-2011 05:43 PM

» Like Us On Facebook



02:54 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.