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  • SN95 4.6L Mustang Tech

Jerks Into Gear

  • Thread starter Thread starter kreil45
  • Start date Start date May 20, 2012
K

kreil45

Member
Mar 18, 2011
36
0
6
Tallahassee, Fl
May 20, 2012
#1
  • May 20, 2012
  • #1
Have an 03 gt auto and when i put it into drive it jerks or jumps into gear. All the mounts are good and so are the u-joints and and drive shaft. Any ideas?
 

nyuk98gt

15 Year Member
Oct 10, 2000
1,427
6
79
Chesterfield, MO
May 20, 2012
#2
  • May 20, 2012
  • #2
kreil45:

Modifications to the car, please. Stock tune or aftermarket? How's the ATF level and color (bright and clear deep red or burnt and brown and murky)?

Chris
 
K

kreil45

Member
Mar 18, 2011
36
0
6
Tallahassee, Fl
May 20, 2012
#3
  • May 20, 2012
  • #3
nyuk98gt said:
kreil45:

Modifications to the car, please. Stock tune or aftermarket? How's the ATF level and color (bright and clear deep red or burnt and brown and murky)?

Chris
Click to expand...
completely stock and atf full and recently had fluid changed (6 months) and it was doing the same thing before fluid change.
 

nyuk98gt

15 Year Member
Oct 10, 2000
1,427
6
79
Chesterfield, MO
May 20, 2012
#4
  • May 20, 2012
  • #4
kreil45:

Thanks for the info.

I'm wondering if your idle speed is too high. Do you have access to a datalogger like an XCal2 or XCal3? If you have a buddy with an XCal for a Ford, it will datalog your vehicle, too.

Are there any other shifting issues? How about putting the transmission in Reverse (does it jerk)?

How many miles on the car? Driven normally or by a bunch of teenage boys and their friends?

Chris
 

blkstanger

Member
Sep 18, 2011
45
0
6
El Cajon Ca.
May 20, 2012
#5
  • May 20, 2012
  • #5
Does it only do it when cold or does it happen after it's warmed up also? I know on mine I have to get it to idle down before putting it in gear or it jerks.
 

nyuk98gt

15 Year Member
Oct 10, 2000
1,427
6
79
Chesterfield, MO
May 20, 2012
#6
  • May 20, 2012
  • #6
blkstanger:

Good point! I let the engine warm up for about 30 seocnds - that's the time it takes for the idle speed to come down to 'high normal'. Once a little temperature builds, the idle settles in at normal.

kreil45:

Has the transmission been rebuilt? If so, some friction material may still be stuck in the bore(s) of the valve body. Not the big accumulators but the little valves that are in the valve body.

A datalogger will tell you a lot. Without "seeing" what is going on at start-up, you will spend a lot of time guessing and/or replacing parts. Do you know anybody nearby who has a datalogger/laptop?

Chris
 
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