Jerking acceleration - Mustang Evolution

Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 06-10-2013, 01:40 PM   #1
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
Jerking acceleration

Ok start from the beginning. Car sat for 2 yrs but started and run for about half hour maybe once a month sometimes longer. Fixed it and started driving around April. About a month ago it started jerking on acceleration. But one under a strong load. If I was easy tit would not jerk. So found that the fuel pump under a strong load and the back to idle would drop 20-30 psi until it sat at idle for 5-10 min and then go back to normal. Didn't think that was the problem but still fixed it and now never changes psi. Than changes the fuel regulator and no change. Next looking into the MAS EGR and the EGR modulator. So replace the modulator and change a little but but not perfect. Was tied between the MAS and the EGR. I borrowed the MAS from my friend at the part store and put it in but didn't fully fix the issue. So would like to know if anyone has a good idea as to what is wrong or if someone has had the same problem and knows what fixes it.
38V6STANG is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-10-2013, 01:43 PM   #2
Registered Member
Regular
 
FortyBrandon's Avatar
 
Join Date: Jun 2012
Region: Tennessee
Posts: 1,057
Is it a v8?
FortyBrandon is offline   Reply With Quote
Old 06-10-2013, 01:51 PM   #3
Registered Member
Regular
 
2300turboford's Avatar
 
Join Date: Nov 2011
Location: london
Region: Kentucky
Posts: 2,903
It's in the v6 threads^
__________________
"Racing is life ,anything before or after is just waiting "-the king of cool -Steve McQueen
2300turboford is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-10-2013, 01:52 PM   #4
Registered Member
Regular
 
FortyBrandon's Avatar
 
Join Date: Jun 2012
Region: Tennessee
Posts: 1,057
Quote:
Originally Posted by 2300turboford View Post
It's in the v6 threads^
Lol just picking with him. His name is 38v6 lol
FortyBrandon is offline   Reply With Quote
Old 06-10-2013, 03:51 PM   #5
Registered Member
Regular
 
samuelsmith's Avatar
 
Join Date: Feb 2013
Location: Gulfport
Region: Mississippi
Posts: 1,234
When is the last time you changed the fuel filter?
__________________

new engine,1.7 rocker arms,Pipes exhaust, shorty cats , shorty headers,under drive and overdrive pulleys,4.2 upper plenum, throttle body spacer, cold air intake, stage one clutch, shorty shifter, and tune. 8.8 in storage
samuelsmith is offline   Reply With Quote
Old 06-10-2013, 06:20 PM   #6
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
It's a v6 and I changed it when I got it back on the road.
38V6STANG is offline   Reply With Quote
Old 06-10-2013, 07:47 PM   #7
Registered Member
Regular
 
1slosix's Avatar
 
Join Date: Jul 2012
Region: Tennessee
Posts: 7,311
when you put on the MAF sensor did you do a full drive cycle...just swapping it out wouldn't give instant perfect results because the car is learning the new part
__________________

carving corners like a boss
1slosix is offline   Reply With Quote
Old 06-10-2013, 09:22 PM   #8
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
Yea drove about 5 miles also it didn't have that jerking except some in fifth. That's y I think the main issue is the EGR if not both EGR and MAS
38V6STANG is offline   Reply With Quote
Old 06-10-2013, 09:27 PM   #9
Registered Member
Regular
 
1slosix's Avatar
 
Join Date: Jul 2012
Region: Tennessee
Posts: 7,311
Quote:
Originally Posted by 38V6STANG View Post
Yea drove about 5 miles also it didn't have that jerking except some in fifth. That's y I think the main issue is the EGR if not both EGR and MAS
a drive cycle is closer to 100 miles not 5
__________________

carving corners like a boss
1slosix is offline   Reply With Quote
Old 06-26-2013, 08:33 PM   #10
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
So finally fully replaced the MAS and hasn't helped yet but will wait and c.
38V6STANG is offline   Reply With Quote
Old 06-26-2013, 09:53 PM   #11
Registered Member
Regular
 
1shotkllz's Avatar
 
Join Date: Apr 2012
Region: North Carolina
Posts: 398
Jerking usually refers to some type of missfire. Check your plugs and all that good stuff.
1shotkllz is offline   Reply With Quote
Old 06-27-2013, 07:16 AM   #12
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
No it's not a misfire. I used my coworker comp and it shows if the ecu feels a misfire and none of them were misfiring. So I know it has to do something with fuel intake and exaust. So I going to wait and c what happens with the MAS and then move onto the EGR.
38V6STANG is offline   Reply With Quote
Old 06-27-2013, 08:30 AM   #13
Registered Member
Regular
 
SpeedyG's Avatar
 
Join Date: Mar 2013
Location: Hackensack
Region: New Jersey
Posts: 402
Quote:
Originally Posted by 38V6STANG View Post
No it's not a misfire. I used my coworker comp and it shows if the ecu feels a misfire and none of them were misfiring. So I know it has to do something with fuel intake and exaust. So I going to wait and c what happens with the MAS and then move onto the EGR.
I was havin the same problem earlier this week, changed my MAFS, iac, IAT plugs, and wires. How do I check the egr?
SpeedyG is offline   Reply With Quote
Old 06-27-2013, 11:43 AM   #14
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
Need to have a comp that has the data to read it. And while driving look at the voltage it show's while driving. At idle it should be at .9v and at different moment c how the voltage changes. I don't remember what it should change on different loads but no matter what should never exceed 5v
38V6STANG is offline   Reply With Quote
Old 07-01-2013, 10:09 PM   #15
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
So still can have that problem but its not as much. Fifth gear has it or just under enough load but not always. Also the more I drive in one day the more it has an issue under load.
38V6STANG is offline   Reply With Quote
Old 07-01-2013, 10:55 PM   #16
Registered Member
Regular
 
1shotkllz's Avatar
 
Join Date: Apr 2012
Region: North Carolina
Posts: 398
Quote:
Originally Posted by 38V6STANG View Post
No it's not a misfire. I used my coworker comp and it shows if the ecu feels a misfire and none of them were misfiring. So I know it has to do something with fuel intake and exaust. So I going to wait and c what happens with the MAS and then move onto the EGR.
The ecu doesn't always read a missfire. I chased the same issue down for months with no codes or anything. Turned out my plugs were bad. It only did it under load as well.

Had the same issue with my 4 cyl mazda. Changed plugs, wires. Ended up being the coil pack. Wont hurt to actually look at them. I still say it's ignition.
1shotkllz is offline   Reply With Quote
Old 07-02-2013, 04:09 PM   #17
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
Well there is no codes but ford has a misfire scanner that shows any kind of misfire. It will show it even if its only one misfire every other cycle. The numbers do not move from 0. But I agree with u on replacing those parts. I can c it being some kind of misfire.
38V6STANG is offline   Reply With Quote
Old 07-02-2013, 04:55 PM   #18
Registered Member
Regular
 
Milehigh STK's Avatar
 
Join Date: May 2013
Location: Colorado Springs
Region: Colorado
Posts: 379
The same happens o my v6 but only on one gear at a high rate of acceleration. Like merging onto the highway or just when I feel like going fast . Could this be a spark plug issue as it started happening right after I did a full tune up including new spark plugs? If so why would it only happen in a certain gear at hi acceleration? And also how would I go about fixing it if it were a ark plug problem?
Milehigh STK is offline   Reply With Quote
Old 07-02-2013, 07:06 PM   #19
Registered Member
Regular
 
38V6STANG's Avatar
 
Join Date: May 2013
Location: Germantown
Region: Maryland
Posts: 21
Idk yet but when I eventually find the issue I will let you know.
38V6STANG is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are On
Refbacks are Off


» Like Us On Facebook



08:57 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.