Sputtering/hesitation in part throttle
03-23-2011, 06:38 PM
#11
3rd Gear Member
Join Date: Feb 2008
Location: Delaware
Posts: 801
TPS could definitely cause the issues above. If the TPS is falsely reading, it may read wide open, and idle fine as they are the extremes, however anything between that could be a cluster**** if the TPS is giving false voltages during partial throttle.
It could be reading messed up, and the engine thinks it has more throttle than it does. Remember, at WOT the pcm pulls injector data from collected MAF data, and the TPS is really doing nothing. However at partial throttle, the TPS and MAF are used to determine how much air at any given time is being allowed through the throttle body at a said amount of opening.
It could be reading messed up, and the engine thinks it has more throttle than it does. Remember, at WOT the pcm pulls injector data from collected MAF data, and the TPS is really doing nothing. However at partial throttle, the TPS and MAF are used to determine how much air at any given time is being allowed through the throttle body at a said amount of opening.
03-23-2011, 08:23 PM
#12
5th Gear Member
Thread Starter
Join Date: Mar 2008
Location: PA
Posts: 2,825
TPS could definitely cause the issues above. If the TPS is falsely reading, it may read wide open, and idle fine as they are the extremes, however anything between that could be a cluster**** if the TPS is giving false voltages during partial throttle.
It could be reading messed up, and the engine thinks it has more throttle than it does. Remember, at WOT the pcm pulls injector data from collected MAF data, and the TPS is really doing nothing. However at partial throttle, the TPS and MAF are used to determine how much air at any given time is being allowed through the throttle body at a said amount of opening.
It could be reading messed up, and the engine thinks it has more throttle than it does. Remember, at WOT the pcm pulls injector data from collected MAF data, and the TPS is really doing nothing. However at partial throttle, the TPS and MAF are used to determine how much air at any given time is being allowed through the throttle body at a said amount of opening.
05-01-2011, 02:23 PM
#14
Join Date: Mar 2011
Location: oklahoma
Posts: 5
hey man, been watching this thread for a while because i was haveing issues with my 04 Mach1. pretty much the same stuff your describing. I take pride in my rides and when i want to put my foot in any of them I expect them to do what they SHOULD do! so, i replaced fuel pump, intake gasket, o2 sensors. i tested every sensor and relay, more than once, and they all checked out. but there was 1 sensor that i could not find a test for. anyway, it was my fuel rail pressure sensor. on mine its mounted on the front of driver side rail. it has an elec connection and a vacuum going to it. costed $120 at the ford house, its the only place to buy it! hope this helps, peace!
05-02-2011, 11:05 PM
#15
5th Gear Member
Thread Starter
Join Date: Mar 2008
Location: PA
Posts: 2,825
hey man, been watching this thread for a while because i was haveing issues with my 04 Mach1. pretty much the same stuff your describing. I take pride in my rides and when i want to put my foot in any of them I expect them to do what they SHOULD do! so, i replaced fuel pump, intake gasket, o2 sensors. i tested every sensor and relay, more than once, and they all checked out. but there was 1 sensor that i could not find a test for. anyway, it was my fuel rail pressure sensor. on mine its mounted on the front of driver side rail. it has an elec connection and a vacuum going to it. costed $120 at the ford house, its the only place to buy it! hope this helps, peace!
05-03-2011, 06:30 PM
#16
2nd Gear Member
Join Date: Jun 2007
Location:
Posts: 155
Where is your MAF located?
I had similar issues and it was caused by air hitting the MAF at velocity in the fender through my aftermarket front bumper
I made a simple shield from sheet metal and it fixed the problem.
I had similar issues and it was caused by air hitting the MAF at velocity in the fender through my aftermarket front bumper
I made a simple shield from sheet metal and it fixed the problem.
05-03-2011, 06:55 PM
#17
3rd Gear Member
Join Date: Apr 2007
Location: Worcester County, MA
Posts: 853
I Bet you need new coil pack(s), my friend just had to do this to his 02 GT because his cylinder 1 was misfiring because he washed his engine without covering the necessary parts and he ended up shorting it out. Get new pack(s) and youll be good to go man.
And his car was doing the same as yours hesitant and sputter.
And his car was doing the same as yours hesitant and sputter.
Last edited by StangKid018; 05-03-2011 at 07:01 PM.
05-03-2011, 11:47 PM
#18
3rd Gear Member
Join Date: Nov 2007
Location: Killadelphia
Posts: 556
^^^This. My old GT was doing the same thing. I got some weapon x cop and it ran like a champ. Now you don't have to get those but I bet thats the problem. Don't get accel ones there garbage, trust me I know.
Thread
Thread Starter
Forum
Replies
Last Post
AMAlexLazarus
AmericanMuscle.com
21
04-04-2020 02:16 PM
tj@steeda
Steeda Autosports
0
09-08-2015 11:50 AM
zanemoseley
2005-2014 Mustangs
6
09-06-2015 12:58 PM
