StreetStangs.net  

Go Back   StreetStangs.net > Technical > Mod Motor Tech (4.6 & 5.4)

Reply
 
Thread Tools Display Modes
Old 07-12-2011, 07:01 PM   #11
Craig K.
Nothing new here
 
Craig K.'s Avatar
 
Join Date: Dec 2004
Location: Senoia, GA
Posts: 2,990
egr stuck open? sounds like a similiar running condition that we had with the Durango.

How many miles, should you just all coil packs, wires/plugs?
__________________
1974 Triumph TR6
1985 Monte Carlo SS
1986 Mustang GT
2011 KIA Optima GTS
Craig K. is offline   Reply With Quote
Old 07-12-2011, 08:32 PM   #12
1sicklx
BamaMafia 4 Life
 
1sicklx's Avatar
 
Join Date: Feb 2005
Location: Lake View, AL
Posts: 2,577
105K

Plugs are new. There are no plug wires.
__________________
1999 Ford F-150 Lariat
1sicklx is offline   Reply With Quote
Old 07-21-2011, 04:32 PM   #13
1sicklx
BamaMafia 4 Life
 
1sicklx's Avatar
 
Join Date: Feb 2005
Location: Lake View, AL
Posts: 2,577
After going into fail safe mode I took it to a shop. They've had it 3 days and can't figure out what's going on.

Dropped the exhaust from the manifolds back and saw no improvement so they don't think the cats are at fault.

The ecu hasn't thrown any new codes, but it is now missing on cyl 4. checked the coil, plug, injector, fuel pressure, wiring, cyl pressure ... good spark and fuel, cyl pressure within normal tollerances ... moved the coil, plug, injector to a different cyl and #4 is still missing. They don't know what's causing it.

Throttle is not responding, but the IAC seems to be functioning as they can adjust the idle through the ecu.

__________________
1999 Ford F-150 Lariat
1sicklx is offline   Reply With Quote
Old 07-21-2011, 05:01 PM   #14
QWKSNKE
3v's are slow
 
QWKSNKE's Avatar
 
Join Date: Dec 2004
Location: Here and There
Posts: 17,152
I wonder if you have some injectors going out. Can you slap some 19's out of mustang to throw in it to see if that resolves the issue?
QWKSNKE is offline   Reply With Quote
Old 07-21-2011, 08:27 PM   #15
banditmwp
Welcome to America!
 
banditmwp's Avatar
 
Join Date: Dec 2004
Location: in the 11's
Posts: 4,501
Send a message via AIM to banditmwp Send a message via Yahoo to banditmwp


Broken valve spring?
__________________

91 GT Convertible

2006 Nissan Titan LE Crew Cab
2014 Peterbilt 337/Marion 22' box
banditmwp is offline   Reply With Quote
Old 07-21-2011, 08:32 PM   #16
QWKSNKE
3v's are slow
 
QWKSNKE's Avatar
 
Join Date: Dec 2004
Location: Here and There
Posts: 17,152
Quote:
Originally Posted by banditmwp View Post


Broken valve spring?
spring or follower was my next guess
__________________
2009 Porsche Carrera S
2008 ///AMG C63.. Eurocharge Tune. RIP
2019 AMG GLC43..wife's
03 F250 SD.. Edge Evo, AFE Stage 1 CAI
08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's
01 Cobra vert... wife's

I need a new toy
QWKSNKE is offline   Reply With Quote
Old 07-22-2011, 05:43 AM   #17
swammi
magnaflow lover
 
swammi's Avatar
 
Join Date: Nov 2009
Location: pisgah al
Posts: 150
just ran into similar issues with a 4.6 crown vic at the shop. i replace the crank sensor and this took the 1600 code out. after more checking it was a valve sticking . does it run better cold ?
__________________
97 f150 lariat excab tow rig
93 mustang gt under construction
swammi is offline   Reply With Quote
Old 07-22-2011, 04:06 PM   #18
ncontt
pro-jackstand racer
 
ncontt's Avatar
 
Join Date: May 2005
Location: Milner, Ga
Posts: 2,473
Send a message via AIM to ncontt Send a message via Yahoo to ncontt
Quote:
Originally Posted by banditmwp View Post


Broken valve spring?
had a buddy with broken valve spring on a 99 gt....sounded similar to these symptoms
__________________
And God created Neil Peart so that lightning would make sense to the world.
~~~~~~~~~~~~~~~~~~~~~~~~~~~
ncontt is offline   Reply With Quote
Old 07-22-2011, 04:13 PM   #19
banditmwp
Welcome to America!
 
banditmwp's Avatar
 
Join Date: Dec 2004
Location: in the 11's
Posts: 4,501
Send a message via AIM to banditmwp Send a message via Yahoo to banditmwp
Quote:
Originally Posted by ncontt View Post
had a buddy with broken valve spring on a 99 gt....sounded similar to these symptoms
can't remember if it was qwk or italian lx but one of them had similar symptoms from a broken spring..
__________________

91 GT Convertible

2006 Nissan Titan LE Crew Cab
2014 Peterbilt 337/Marion 22' box
banditmwp is offline   Reply With Quote
Old 07-24-2011, 08:38 AM   #20
EHardy1971
Trunk Monkey
 
EHardy1971's Avatar
 
Join Date: Jun 2007
Location: Home
Posts: 5,708
Quote:
Originally Posted by banditmwp View Post
can't remember if it was qwk or italian lx but one of them had similar symptoms from a broken spring..
Italian. Have you tried a compression/leakdown test on it?
__________________
Eric
89 LX Coupe-Juiced
01 Lightning-Boost
06 TBSS
EHardy1971 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -6. The time now is 07:50 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.