2006 Mercury Mariner Stalling when stopping

RANDYB7646

MEMBER
2006 MERCURY MARINER
6 CYL
4WD
AUTOMATIC
45,000 MILES

Sporadic, but willl stall when coming to a stop. Easing into the stop seems to help. Took the car to the dealer, no codes found; and ofcourse it did not stall while the dealer hat it. Ford Hotline suggested checking the grounds under the drivers seat and gas tank. Chose not to do this. Has now stalled twice since.
Did some research, and came across 2 possibilities.
1. Torque converter not unlocking. Would this be an intermittent issue? And how do I check this?
2. IAC motor/valve. I've read that this does not always generate a fault, and can be intermittent.

Could it be anything else?

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

It can be either one! There is a TSB(technical service bulliten) on the transmission torque converter not unlocking due to wear.
CD4E - ENGINE STALLING ON ENGAGEMENT/STOPPING TECHNICAL SERVICE BULLETIN Reference Number(s): 07-5-6, � Date of Issue: � March 19, 2007 Related Ref Number(s): 07-5-6 ARTICLE BEGINNING ISSUE Some 2005-2008 Escape and Mariner vehicles equipped with a CD4E automatic transaxle and built from 8/1/2004 through 2/15/2007 may exhibit an engine stall when coming to a stop or when engaging the transmission into drive or reverse. This condition may be intermittent and often occurs after extended drives. There may be no diagnostic trouble codes (DTCs) stored. This may be caused by internal wear in the torque converter which prevents it from unlocking. ACTION Follow the Service Procedure steps to correct the condition. SERVICE PROCEDURE 1. Inspect and repair all non transaxle codes per Workshop Manual (WSM) and Powertrain Controls/Emissions Diagnosis (PC/ED) manuals. 2. Use the Integrated Diagnostic System equipment to monitor the PIDs (Parameter Identification) for TC_SLIPACT as the stall is occurring. A. If the slip is greater than 20 RPM, the stalling is not transaxle related. Repair following PC/ED procedures for engine stalling condition. B. If TC_SLIPACT is less than 20 RPM with the transmission in park or neutral, torque converter internal failure is the most likely cause, proceed to Step 3. 3. Remove the transaxle assembly and check the rotation of the torque converter in the bell housing. A failed converter will be difficult to rotate. 4. Remove the torque converter, drain the automatic transmission fluid (ATF) and refill the CD4E transmission assembly using MERCON(R) V ATF. 5. Install a new torque converter and reinstall the transaxle assembly. 6. Back flush the transmission cooler system as described in the WSM, Section 307-01A. PARTS INFORMATION
FORD: 2005-2008 Escape MERCURY: 2005-2008 Mariner
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