1998 Ford Contour surging

BEEHMER

MEMBER
1998 FORD CONTOUR
6 CYL
FWD
AUTOMATIC
129,000 MILES

When driving at highway speeds (50+ mph) the transmission downshifts then shifts back into OD very hard. It will constantly and frequently surge like this until you slow down below 50mph. It surges like this only at the above mentioned speeds. It never surges when driving below 50mph. The transmission was replaced by AAMCO a year ago and has done this ever since. It was a rebuilt transmission. They have maintained that there was nothing wrong with the transmission and it is out of warranty now. This is the SVT model with the 2.5L Duratec engine.

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

Take this tech bulletin to AAMCO, one of the worst shops in my opinion, they SHOULD know about this, it's a KNOWN problem, here is part of the Ford service bulletin to their dealers, I will email the entire TSB to you, print it out, take it to them it IS on them!
CD4E - HARSH/DELAYED SHIFTS AFTER TRANSAXLE OR TSS REPLACEMENT TECHNICAL SERVICE BULLETIN Reference Number(s): 02-2-4, � Date of Issue: � February 4, 2002 Related Ref Number(s): 02-2-4 ARTICLE BEGINNING DESCRIPTION TRANSAXLE - CD4E - HARSH AND DELAYED 1-2/2-3 UPSHIFTS - AFTER TRANSAXLE OR TURBINE SHAFT SPEED SENSOR (TSS) REPLACEMENT - POSSIBLE DIAGNOSTIC TROUBLE CODES (DTC) 628, 642, 645, 646, 647, 648, P0731, P0732, P0734, P0741, AND P1744 Some vehicles equipped with the CD4E transaxle may exhibit harsh and delayed 1-2/2-3 upshifts along with DTCs for gear ratio errors after the Transaxle or Turbine Shaft Speed sensor (TSS) have been replaced. DTCs may include OBD I codes 628, 642, 645, 646, 647, 648, or OBD II codes P0731, P0732, P0734, P0741, and P1744. FORD: 1994-1997 PROBE; 1995-2000 CONTOUR; 2001-2002 ESCAPE MERCURY: 1995-2000 MYSTIQUE; 1999-2002 COUGAR Page 1 of 1 5/12/2010 .