1994 Mustang 3.8 ltr step on the gas and it chokes ? - Ford Mustang Forum
 
LinkBack Thread Tools
post #1 of 13 (permalink) Old 10-16-2010 Thread Starter
Rookie
 
kat3876's Avatar
 
Joined: Oct 2010
Location: south florida
Posts: 6
 
1994 Mustang 3.8 ltr step on the gas and it chokes ?

Ok i am at a loss

3.8 ltr. manual transmission mileage 52,000 original owner couldnt figure it out so i bought it thinking this should be easy to flip,yea right.

no codes with an actron scanner
changed the following
plugs with oem
wires
coil pack
cam synchro sensor
maf
timing at 10 dgrees
ecm brain
ignition module

what am i missing
car idles fine

kat3876 is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 10-16-2010
Apprentice
V6 Member
 
MasterDrake420's Avatar
 
Joined: Oct 2010
Location: Kissimmee
Posts: 99
 
Does the engine die when you give it gas? just curious, I'm having a similiar problem, when I take off from a stop I have a 1/2 second hesitation from when I hit the gas and the engine reacts.

MasterDrake420 is offline  
post #3 of 13 (permalink) Old 10-16-2010
Apprentice
 
DRPatton302's Avatar
 
Joined: Jun 2010
Location: Republic
Posts: 65
 
have you checked the fuel pressure?
Kinda sounds like a fuel filter or weak pump.
DRPatton302 is offline  
 
post #4 of 13 (permalink) Old 10-16-2010
Apprentice
V6 Member
 
MasterDrake420's Avatar
 
Joined: Oct 2010
Location: Kissimmee
Posts: 99
 
a way to check fuel pressure is to check it from the fuel rail, unscrew the cap and depress down the stem and fuel should spray out.
MasterDrake420 is offline  
post #5 of 13 (permalink) Old 10-16-2010
SHELBY GT 350 Member
V6 Member
 
shinerstang's Avatar
 
Joined: Mar 2006
Location: Greensburg
Posts: 8,348
 
Quote:
Originally Posted by MasterDrake420 View Post
a way to check fuel pressure is to check it from the fuel rail, unscrew the cap and depress down the stem and fuel should spray out.
No. The proper way to check rail pressure is with a gauge. 8psi will spray out eventhough you need 35+......

Did you check timing with the spout connector out? It really sounds like a bad MAF. Did you try unplugging it while the car is idling and see if it stalls?

2002 V6 Turbo 10:[email protected]
2001 V6 Nitrous 12:[email protected]
shinerstang is offline  
post #6 of 13 (permalink) Old 10-17-2010 Thread Starter
Rookie
 
kat3876's Avatar
 
Joined: Oct 2010
Location: south florida
Posts: 6
 
a little more info

ok fuel pressure is great its running so rich it will make cough and the
plugs are wet

yes checked timing with the spout [ located next to the maf} off its just a half degree over / say 10.5 btdc

unplugged maf still idles fine even switched with a known good maf

checked compression all are about 170 to 175 psi per cylinder

car idles fine at about 550 rpm but try to give it gas it just chokes out to me this seems to be a timing issue because if i can get it to rev i have a heavy knock or detonation

am gonna check the real time sensor values today with a better code reader / car is obd 2 and no check engine light or codes showing up

maybe plugged cats ?

thanks for all your help and input
kat3876 is offline  
post #7 of 13 (permalink) Old 10-17-2010
SHELBY GT 350 Member
V6 Member
 
shinerstang's Avatar
 
Joined: Mar 2006
Location: Greensburg
Posts: 8,348
 
Sorry, bad info on my part. The MAF will operate the car if unplugged. UGH, I was thinking IAC because we've had so many questions here lately about it. Clogged cats might be the issue. It's hard diagnosing something over the internet. A bad computer will also do what you described.....

2002 V6 Turbo 10:[email protected]
2001 V6 Nitrous 12:[email protected]
shinerstang is offline  
post #8 of 13 (permalink) Old 10-17-2010 Thread Starter
Rookie
 
kat3876's Avatar
 
Joined: Oct 2010
Location: south florida
Posts: 6
 
ok more info

from an actron scanner

motor is at idle
abslt tps 14.9
load 23.9
mal flo gr/se 4.59
coolant180
iat 80 f
ign adv bounces 17-23 adv
sec air- atmos
st ftrm% 7
lt 6
st 1% 8
st 2% 13
veh speed oool
fuel 1 closed
fuel2 na
o2s12v- 0.130
o2s21v- 0.1 fluctuates to 0.5
st ftrm 21%-5.1%
o2s22v 0.205-0.350

hmmmm
kat3876 is offline  
post #9 of 13 (permalink) Old 10-17-2010 Thread Starter
Rookie
 
kat3876's Avatar
 
Joined: Oct 2010
Location: south florida
Posts: 6
 
hmm

yes and the o2 sensors need to be changed ....tomorrow
kat3876 is offline  
Apprentice
5.0L Member
 
Marc's Avatar
 
Joined: Apr 2007
Location: Atlantic Seaboard
Posts: 178
 
So what exactly do you mean by 'cough'? If i understand correctly it sputters and wants to die when you step on the gas, but idles fine?
Just a thought is your car chipped?

1995 3.8 - K&N, Cowley high flow 2.25" catless y-pipe
Shift kit
******************** Retired

1995 GT vert
Auto
K&N, Powerflow 2.25" offroad x-pipe
Marc is offline  
post #11 of 13 (permalink) Old 10-18-2010 Thread Starter
Rookie
 
kat3876's Avatar
 
Joined: Oct 2010
Location: south florida
Posts: 6
 
car is not chipped

i even picked a used ecm from the auto yard

as in choke its just that like stuffing a rag over an old carb but if i feather it ever so lightly i can coax it to rev up stll scratching my head lol
kat3876 is offline  
post #12 of 13 (permalink) Old 10-18-2010 Thread Starter
Rookie
 
kat3876's Avatar
 
Joined: Oct 2010
Location: south florida
Posts: 6
 
also

no one has asked yet but i have drained the tank and put in injector cleaner and high test gas as it has been sitting and will clean the egr and iac tonight as for the o2 sensors got to wait till pay day
kat3876 is offline  
Rookie
 
gapimpin's Avatar
 
Joined: Jun 2007
Location: Waco
Posts: 6
 
Any update on this? I have a 2002 doing the same thing. No codes idles fine I can still drive it but cant give it more than 1/2 throttle and it feels like its missing. Replaced the plugs wires all filters. o2 sensors are reading fine egr valve and pressure sensor have been replaced. Its the damnedest thing.
gapimpin is offline  
Sponsored Links
Advertisement
 
Closed Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 Off
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 


Search Engine Friendly URLs by vBSEO 3.6.1