Engine 92 mustang rough cold start

Jvshouse

New Member
Mar 27, 2018
18
0
1
37
Ill start my 92 after it sits overnight and it will fluctuate between almost stalling n 1200 rpms. If i rest my foot on pedal for a minute its good after i let off after a minute.. Today though it idled at about 600 rpms on the verge of stalling. Then i let it warm up n it was fine. Idle at 900 rpms n no issues. Is something dirty or what? I was watching voltage for battery n it was moving alot a little lower then half then a little higher but never steady. Its 130 amp w underdrive pulleys. Thanks
 
  • Sponsors(?)


General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
17,334
5,599
193
polk county florida
On the fox tech page there is a forum technical/how to section, there you will find the 'surging idle checklist' go through it step by step and it will help you resolve your issue, save you time and money.
jrichker put it together and it works, just don't skip around, the next step depends on the results from the one before. I can tell you it works.
 

jrichker

StangNet's favorite TOOL
SN Certified Technician
Mar 10, 2000
27,448
2,874
234
74
Dublin GA
lowendmac.com
Some extra help to get you there...

You guys with idle/stall problems could save a lot of time chasing your tails if you would go through the [URL=" http://forums.stangnet.com/showthread.php?t=698148"]Surging Idle Checklist[/URL]. Over 50 different people contributed information to it. The first two posts have all the fixes, and steps through the how to find and fix your idle problems without spending a lot of time and money. It includes how to dump the computer codes quickly and simply as one of the first steps. I continue to update it as more people post fixes or ask questions. You can post questions to that sticky and have your name and idle problem recognized. The guys with original problems and fixes get their posts added to the main fix. :D



It's free, I don't get anything for the use of it except knowing I helped a fellow Mustang enthusiast with his car. At last check, it had more than 250,000 hits, which indicates it does help fix idle problems quickly and inexpensively.
 
  • Like
Reactions: General karthief
Thread starter Similar threads Forum Replies Date
0 2003 Ford Mustang V6 3.8L gets around 12mpg and seems to shake a bit when started cold and has a bad rough idle when warm SN95 V6 Mustang Tech 5
G mustang running rough after car wash 1996 - 2004 SN95 Mustang -General/Talk- 10
E 2010 Mustang GT - randon, intermittent, fresh hard starts with rough idle. 2005 - 2014 S-197 Mustang -General/Talk- 0
J 93 mustang breaking up during acceleration 2.3L (N/A & Turbo) Tech 11
T Engine 1994 mustang gt Rough idle, misfire under acceleration 1994 - 1995 Specific Tech 2
P 95 mustang gt running rough 1994 - 1995 Specific Tech 0
R 2000 mustang runs rough and dies when warm SN95 V6 Mustang Tech 10
K What's it Worth? Seeking rough valuation on manual 1967 Coupe w/ 351 Windsor What is it Worth?!?!? 2
S Engine 5.0 Running Rough (1990) Fox 5.0 Mustang Tech 1
L Engine Rough Idle at Start, Possible CMCV Vacuum Leak 2015+ Specific Tech 0
Wesley.davis 2004 Mustang Gt running really rough SN95 4.6L Mustang Tech 2
H Mustang running rough 1996 - 2004 SN95 Mustang -General/Talk- 3
nick_obryan 18 Ecoboost Mustang rough startup and white smoke? 2015+ (S550) Mustang -General/Talk 1
W 1994 Steeda Mustang GT woes and pains! in need of help! 1994 - 1995 Specific Tech 7
P Engine 2002 mustang V6 rough idle in gear at low RPMs SN95 V6 Mustang Tech 2
I 96 Mustang V6 Help SN95 V6 Mustang Tech 0
S 99 V6 Mustang Loss Power Rough Idle And Drive SN95 V6 Mustang Tech 0
M 94 Mustang V6 Manual Running Rough Gauges Erratic 1994 - 1995 Specific Tech 12
G 2002 Mustang V6 3.8l Rough Throttle From Idle SN95 V6 Mustang Tech 0
J Please Help Can Not Figure Out Electrical Problem 1996 - 2004 SN95 Mustang -General/Talk- 1
J Engine 90' Mustang Loss Of Power/runs Rough Fox 5.0 Mustang Tech 15
P 1994 Mustang Gt Rough Idle, Major Power Loss 1994 - 1995 Specific Tech 25
68Whiskey Engine 2000 Mustang 3.8l Rough Idle At 1500 Rpm SN95 V6 Mustang Tech 0
S 2007 Mustang Rough Grinding In Brake After Changing Rotors,could It Be The Sway Bars? 2005 - 2009 Specific Tech 1
E Engine 1995 Mustang 5.0 Running Rough. 1994 - 1995 Specific Tech 1
805mustang 05 Mustang Gt Running Rough.....hard Diagnosis 2005 - 2014 S-197 Mustang -General/Talk- 3
B Help!!! 95 Mustang Rough Idle Etc 1994 - 1995 Specific Tech 3
N_da_Mood 01 Mustang Rough Idle SN95 V6 Mustang Tech 1
trailblazr81 Mustang wont run right; idles rough, bogs and dies SN95 4.6L Mustang Tech 14
J Rough Idle 2005 mustang V6 2005 - 2009 Specific Tech 0
V New to mustangs 91 LX rough driving (and other) issues... Fox 5.0 Mustang Tech 6
D 96 mustang v6, stalling, rough idle, lost of acceleration SN95 V6 Mustang Tech 0
SCORPIO72 88 MUSTANG, EMISSIONS AND SENSORS, IDLES ROUGH Fox 5.0 Mustang Tech 1
gearheadboy 92 Mustang 2.3 tach inop..idles rough..CEL inop 2.3L (N/A & Turbo) Tech 3
95gt_stang 1995 Mustang GT Running Rough 1994 - 1995 Specific Tech 1
R Just bought my second 65 mustang, rough but beautiful 1965 - 1973 Classic Mustangs -General/Talk- 6
brianmef Rough idling - 2002 Mustang GT SN95 4.6L Mustang Tech 34
H 72 Mustang Running Rough Classic Mustang Specific Tech 2
T 1991 Mustang Rough Idle 2.3L (N/A & Turbo) Tech 2
dmaxstang Rough Draft of the NEW MUSTANG 2010 2005 - 2014 S-197 Mustang -General/Talk- 10
S 98 Mustang GT...Running rough, tailpipes black with soot SN95 4.6L Mustang Tech 18
R 94 mustang rough idle/ code 543 1994 - 1995 Specific Tech 2
3 1993 Mustang LX 4 cylinder running rough 2.3L (N/A & Turbo) Tech 20
H The mustang has rough idle and won't smooth out Fox 5.0 Mustang Tech 4
Sleeper65 98 Mustang GT w/ Rough Idle SN95 4.6L Mustang Tech 3
S Mustang runs rough SN95 4.6L Mustang Tech 2
M Electrical 1989 mustang 5.0 runs rich and stumbles in closed loop Fox 5.0 Mustang Tech 1
W 1997 Mustang GT overheating badly - Tried almost everything 1996 - 2004 SN95 Mustang -General/Talk- 3
B Had a 91 mustang GT for a while now and can't seem to figure out what to put in it or leave it stock Im thinking of a 351w to put in it any ideas The Welcome Wagon 1
S Mustang II 2.8 Head 1975 1974 - 1978 Mustang II Talk & Tech 6
Similar threads