hesitation in response when the gas pedal is pressed - Ford Mustang Forum
Closed Thread
 
LinkBack Thread Tools
post #1 of 16 (permalink) Old 08-08-2009 Thread Starter
Rookie
 
revolutionman's Avatar
 
Joined: Aug 2009
Location: byron center
Posts: 39
 
hesitation in response when the gas pedal is pressed

I have a 1987 mustang, whenever i press the pedal from idle it hesitates, about 1-2 seconds, is this normal?
revolutionman is offline  
Sponsored Links
Advertisement
 
post #2 of 16 (permalink) Old 08-08-2009
Apprentice
5.0L Member
 
apollo12's Avatar
 
Joined: Dec 2007
Location: Port St.Lucie
Posts: 172
 
when was the last time you did a tune up? have you ever cleaned the t/b? I would also pull the codes

1992 notch 306 afr heads n-41 cam tremec 3550 all bolt ons,92 lx 306 eagle crank,rods performer rpm heads aeromotive fuel system ,tremec TKO,92 GT mild build,89 GT sportsman track car,1990 lx
apollo12 is offline  
post #3 of 16 (permalink) Old 08-08-2009 Thread Starter
Rookie
 
revolutionman's Avatar
 
Joined: Aug 2009
Location: byron center
Posts: 39
 
never, my car has been sitting for 2 yrs before i bought it, i put a radiator, water pump, thermostat, and my brother had the engine rebuilt before he put it away.
revolutionman is offline  
post #4 of 16 (permalink) Old 08-10-2009
Apprentice
5.0L Member
 
apollo12's Avatar
 
Joined: Dec 2007
Location: Port St.Lucie
Posts: 172
 
did you put fresh gas in the car?

1992 notch 306 afr heads n-41 cam tremec 3550 all bolt ons,92 lx 306 eagle crank,rods performer rpm heads aeromotive fuel system ,tremec TKO,92 GT mild build,89 GT sportsman track car,1990 lx
apollo12 is offline  
post #5 of 16 (permalink) Old 08-10-2009
SHELBY GT 350 Member
 
302Feen's Avatar
 
Joined: Jan 2008
Location: Norman
Posts: 6,939
 
Check your timing and make sure you're at least running at 10* BTDC. I would go ahead and advance the timing to 12*.

The fuel thing could also be an issue. If you're running off of 2 year old gasoline, I give you a BIG . I've seen what gas can do even after just sitting for a few months. Not pretty...

Change the fuel filter, and hopefully the fuel pump is OK...

-1994 Mustang GT "The Red Baron": 3.73 gears,K&N filter,GT40 tubular intake,BBK Full Length Headers,modified midpipe & Flowmaster muffs, timing at 12*. Best time- 14.74 @ 93.16
-Check profile for pics of our car collection!
- AmericanMuscle ROCKS!!
- "True Hot-Rods don't have valve covers!"
302Feen is offline  
post #6 of 16 (permalink) Old 08-24-2009 Thread Starter
Rookie
 
revolutionman's Avatar
 
Joined: Aug 2009
Location: byron center
Posts: 39
 
no, ive only ran it a few times, but i plan on diluting it with some premium, is it ok if i leave the old gas in it?
revolutionman is offline  
post #7 of 16 (permalink) Old 08-24-2009
Made Member
 
Blackbeauty90GT's Avatar
 
Joined: May 2008
Location: Gastonia
Posts: 834
 
It would be best if you didn't also make sure you have fresh plugs and that they are gaped correctly this fixed the same issue for my 90 GT good luck

03 cobra vert black mostly stock
02 maxima 255hp Daily Driver
(SOLD) 2003 Mustang GT Procharged 374.3 rwhp
(SOLD) Bolt on 1990 GT 5sp conv "Blackbeauty90GT"
Blackbeauty90GT is offline  
post #8 of 16 (permalink) Old 08-24-2009
SHELBY GT 500 Member
5.0L Member
 
spdjnky_42's Avatar
 
Joined: Nov 2007
Location: St.Louis
Posts: 13,640
 
Send a message via Yahoo to spdjnky_42
Definetly need to syphon the old crap out and fill w/ good premium or reg. If your going to advance your timing to 12* then use premium otherwise no need but check your timing to be @ 10*btdc. You will need to do a complete tune-up: Plugs, wires, cap, rotor, oil, filters, etc. Get a can of starting fluid a spray aroumd your intake while idling to check for a bad gasket or hose.
spdjnky_42 is offline  
post #9 of 16 (permalink) Old 08-25-2009 Thread Starter
Rookie
 
revolutionman's Avatar
 
Joined: Aug 2009
Location: byron center
Posts: 39
 
thanks guys, this really helped.
revolutionman is offline  
Made Member
 
MUSTANGPAT93's Avatar
 
Joined: Jul 2009
Location: Sac
Posts: 843
 
Most of the guys in here more than likely got it right when they are saying its bad gas or it just needs a nice tune up. If you already ran the gas might as well run it all out and then tune it up and change everything. Trying to syphon it out you are not going to get everything. No two mustangs are alike in throttle response. I have has some better than others. Most people overlook tps.
MUSTANGPAT93 is offline  
post #11 of 16 (permalink) Old 08-25-2009 Thread Starter
Rookie
 
revolutionman's Avatar
 
Joined: Aug 2009
Location: byron center
Posts: 39
 
tps? whats that?
revolutionman is offline  
Made Member
 
Blackbeauty90GT's Avatar
 
Joined: May 2008
Location: Gastonia
Posts: 834
 
Throttle position sensor its located right on top of the throttle body it needs to be calibrated to I can't remember the voltage but is pretty specific. Thats a good point.

03 cobra vert black mostly stock
02 maxima 255hp Daily Driver
(SOLD) 2003 Mustang GT Procharged 374.3 rwhp
(SOLD) Bolt on 1990 GT 5sp conv "Blackbeauty90GT"
Blackbeauty90GT is offline  
SHELBY GT 500 Member
5.0L Member
 
spdjnky_42's Avatar
 
Joined: Nov 2007
Location: St.Louis
Posts: 13,640
 
Send a message via Yahoo to spdjnky_42
green to black should read .98v or as close as possible (loosen screws to adj then carefully retighten while holding in place) but thats probably not going to give it hesitation.
spdjnky_42 is offline  
Apprentice
5.0L Member
 
86GTVert's Avatar
 
Joined: Jul 2009
Location: Haubstadt
Posts: 226
 
Quote:
Originally Posted by spdjnky_42 View Post
green to black should read .98v or as close as possible (loosen screws to adj then carefully retighten while holding in place) but thats probably not going to give it hesitation.
i AGREE i recalibrated my TPS a couple of weeks ago and i could tell a difference as soon as i started my car. the have been several threads about this subject-i would search the site so you can make sure you are doing it correctly. the car has to be off, the key has to be in the "on position" (when calbirating your voltage). then you need to start your car and recheck your idle screw on your TB. my car(5.0/5speed) is set at a 750RPM for idle, yours will vary based on year and transmission.
to add to the fuel thing, after syphoning out the old junk-add 1/2 a can of Sea-Foam to your tank and run it-you can pick it up at any auto parts store for around $8. good luck!!

86 GT Vert, Black, T-5, MAC shorties,40 series flowmaster 2-1/2", O/R X, CAI, EXP2 Upper and Lower, EXP2 injectors, 65 mm TB, Electric fan, 4:10's, 180* T-stat, MSD coil, cap and button, Taylor wires, 17x9 Cobra R's

07 Dodge Magnum. Electric Strawberry(Red), leather, DVD headrests(for the kiddos).....the grocery getter with an attitude!
87 Porsche 928 S4, Guards Red, sunroof, auto, leather, 18x10's in the rear and 18x8's in the front, magnaflow 2-1/2" exhaust
86GTVert is offline  
SHELBY GT 350 Member
5.0L Member
 
89coupe's Avatar
 
Joined: Nov 2008
Location: Cartersville
Posts: 5,305
 
TPS out of range can result in a Hesistation. The ECM uses the TPS, MAF to determine what type of load condition is on the engine, then uses spark and Fuel as neccessary

Not saying it his Problem, but it can happen.

Change Gas, change Plugs and wires, cap and rotor.

Run the Diagnostic codes. Doesnt matter if the Check Engine Light is on or not.

89 Coupe
347 in progress
89coupe 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









Random Question

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 Off
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


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183