Intermittant stalling

[Porkchop]

Hey guys. A new problem has arisen in the 98 today and it has me worried.

While sitting in traffic or at a stoplight the car will just die. It won't stutter before dying, won't run funny, no SES lights. It starts right back up and I go on my merry way, but it happened tonight w/in a mile of each other and I Have no idea what the issue is. The theft light isn't flashing so I assume its not a PATS issue, again no SES light coming on, when it runs it runs normally.

I hate electrical issues. It seems to happen w/the climate control on "Auto" and it is almost like it happens with the AC compressor cycle. While driving earlier today it was like the AC compressor went on like normal and the car was able to keep itself running albeit with the lights dimming to almost nothing and coming back.. Im going to try and run with it on "Vent" and see if there is something to that.

Any ideas? I read possible cam sensor, FPR, IAC valve ...

Fuel filter was changed ~15,000 miles ago, FPR is stock, IAC I believe is stock

 

[SHOZ123]

Try opening the throttle plate a hair. Then clear the memory and let it relearn idle and IAC settings.

 

[me6894]

its definitely an electrical issue...

mine did the same thing except it wouldnt start again, it was because the fuse box was corroded but i doubt this is the case for you becuase you can start again. check all the grounds, battery cable, etc.

 

[Porkchop]

Try opening the throttle plate a hair. Then clear the memory and let it relearn idle and IAC settings.

Paul,

Using the set screw or just wedge something in there and do a memory reset?

me - I was planning on doing that/replacing them all this summer, too bloody cold to do it otherwise.

I don't know if its connected or not, but while sitting in traffic tonight I could not hear the cooling fans go on once the car got to 170-180*. It went to 210 then cooled off once I got on the highway. I have a 170/160* t-stat in it now.

I ran it on vent and it ran fine on the highway and city.

 

[SHOZ123]

I can't remember the spec. I think it is .05" gap at the throttle stop when the engine is off then another 1/2 turn open.

Sounds like the low speed fan is not coming on.

My car would on occasion stall at a light and then start right up and idle OK too until I opened the throttle plate a bit.

 

[Porkchop]

could it possibly be the TPS? I don't know if you need to clibrate those on the V8, but with my car suffering from the high-idle problem could that be an option?

As far as the fans ... any correction?

 

[SHOZ123]

214F is the stock low speed fan turn on speed, it turns off at 210F.


The TPS does not need to be set or calibrated though. It's plug and play.

Here is a TSB pertaining to stalling for '96s.

Article No.
97-17-9 STALL - ON DECELERATION AND/OR INTERMITTENT STALL IN WARM WEATHER - VEHICLES BUILT THROUGH 8/18/96 AND SHO BUILT THROUGH 8/6/96

Publication Date: AUGUST 18, 1997

FORD: 1996 TAURUS SHO, TAURUS
LINCOLN-MERCURY: 1996 SABLE


This TSB article is being republished in its entirety to correct a service part number.

CALIBRATION:
6-10A-R07, 6-10A-R10, 6-10A-R11, 6-10A-R12, 6-10S-R07, 6-10S-R10, 6-10S-R11, 6-10S-R12, 6-10B-R06, 6-10B-R10, 6-10B-R11, 6-10B-R12, 6-10T-R06, 6-10T-R10, 6-10T-R11, 6-10T-R12, 6-14A-R07, 6-14A-R08, 6-14A-R10, 6-14A-R11, 6-14S-R07, 6-14S-R08, 6-14S-R10, 6-14S-R11, 6LDA-JAD

WARNING: THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE. PERFORMING THIS MODIFICATION ON OTHER ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.



ISSUE:
Some vehicles may stall on deceleration and/or have an intermittent stall in warm weather. This may be caused by the vapor control valve not supplying a steady flow of fuel from the tank to the intake manifold.

ACTION:
Replace the fuel tank, vapor control valve, fuel fill tube cap and clamp. Install heat shield over fuel tank and reprogram the Powertrain Control Module (PCM). This should reduce the possibility of stalling. Refer to the following text for details.

Perform all diagnostics for stalling by following the procedures outlined in the 1996 Powertrain Control/Emissions Diagnosis (PC/ED) Service Manual and 1996 Taurus/Sable Service Manual, Pages 03-13-5 through 03-13-8. Check to be sure Grounds 401 (sedans) and 400 (wagons) are secure. Check for a kink in the canister vent hose and repair as required.

If no other concerns are found, reprogram the PCM using the latest level CD-ROM update disc and refer to the following PCM Application Chart for correct PCM usage. Replace the fuel tank, vapor control valve, and vapor management valve by following the procedure outlined in the Instruction Sheet included in the Fuel System Service Kit.

 

[SHOZ123]

And another TSB for '96 SHO concerning stalling.

Article No.
97-6-7 MALFUNCTION INDICATOR LAMP (MIL) - DIAGNOSTIC TROUBLE CODES (DTCS) P0172, P0175, P1130, P1150 AND/OR P1152 STORED IN MEMORY AND/OR STALL ON LOW SPEED ACCELERATION OR DECELERATION - 3.4L SHO VEHICLES ONLY
STALL - ON LOW SPEED DECELERATION OR ACCELERATION AND/OR MALFUNCTION INDICATOR LAMP (MIL) WITH DIAGNOSTIC TROUBLE CODES (DTCS) P0172, P0175, P1130, P1150 AND/OR P1152 STORED IN MEMORY - 3.4L SHO VEHICLES ONLY
LAMP - MALFUNCTION INDICATOR LAMP (MIL) - DIAGNOSTIC TROUBLE CODES (DTCS) P0172, P0175, P1130, P1150 AND/OR P1152 STORED IN MEMORY AND/OR STALL ON LOW SPEED ACCELERATION OR DECELERATION - 3.4L SHO VEHICLES ONLY

Publication Date: MARCH 17, 1997

FORD: 1996-97 TAURUS SHO


ISSUE:
Some vehicles may stall on a low speed deceleration and/or acceleration and may have Diagnostic Trouble Codes (DTCs) P0172, P0175, P1130, P1150 and/or P1152 stored in memory. This may be caused by an obstructed fuel injection supply manifold.

ACTION:
Measure fuel pressure at the inlet to the fuel injection supply manifold using Rotunda Tool D85L-9974-B. If pressure equals or exceeds 296 kPa (43 psi), remove and replace the Fuel Injection Supply Manifold (F6DZ-9D280-A). Refer to the appropriate year Taurus Service Manual for removal and installation procedures. Be sure to return all parts to the Warranty Parts Return Center (WPRC).


PART NUMBER PART NAME
F6DZ-9D280-A Fuel Injection Supply Manifold

 

[Porkchop]

ok so drop and replace the tank and the associated parts, or the fuel rail? is that what im getting?

I have a FP guage at home and I'll have to get that and I will be checking the FP at the schrader valve.

Its been good lately because ive also been running the heater on vent to try and reduce the use of the AC compressor.

Thanks for that info Paul, it gives me something to at least look towards!

edit: I will be checking the wiring around the coolant temp sensor for the computer to see if something is frayed there, might just need to replace the sensor, but it has not done it since that night.

 

[SHOZ123]

I was looking under the '96 year for the ubove TSBs. FWIW here is the high idle TPS TSB.

Article No.
00-3-5 HIGH IDLE - TAURUS WITH 3.4L SHO AND RANGER WITH 2.5L AND MANUAL TRANSMISSION

Publication Date: JANUARY 31, 2000

FORD: 1998-99 TAURUS SHO
1998-2000 RANGER


ISSUE:
A high idle may occur on some vehicles. This may be caused by a poor electrical connection at the wire harness (-12B637-) to Throttle Position Sensor (TPS).

ACTION:
Splice into wire harness (-12B637-) just after the TPS with TPS Connector High Idle Service Kit. Refer to the following Service Procedure for details.

SERVICE PROCEDURE
Verify the concern vehicle exhibits a "high idle" condition when depressing the clutch or shifting between gears for the Ranger or when shifting between Park and/or Neutral for Taurus SHO. If high idle condition is not exhibited, proceed with other driveability diagnostic fix procedures. If condition is present, obtain a High Idle Service Kit (XF1Z-15K607-AA) and proceed by following the instructions found within the service kit.

PART NUMBER PART NAME
XF1Z-15K607-AA High Idle Service Kit


Another driveability one....

Article No.
99-12-6 LACK OF ENGINE BRAKING - VEHICLES WITH 3.0L ENGINE
ROLLING IDLE - VEHICLES WITH 3.0L 2-VALVE CALIFORNIA CALIBRATION
SPARK KNOCK - VEHICLES WITH 3.0L 2-VALVE ENGINE
MALFUNCTION INDICATOR LAMP (MIL) - ILLUMINATED WITH DIAGNOSTIC TROUBLE CODES (DTCS) P0135, P0155, AND/OR P1138 STORED IN MEMORY - 3.0L VEHICLES WITH 2- OR 4-VALVE ENGINE OR 3.4L VEHICLES

Publication Date: JUNE 1, 1999

FORD: 1998 TAURUS SHO, TAURUS
LINCOLN-MERCURY: 1998 SABLE


ISSUE:
The Malfunction Indicator Lamp (MIL) may illuminate and the following Diagnostic Trouble Codes (DTCs) and symptoms may be stored in memory:

P0135, P0155 - Heated Exhaust Gas Oxygen (HEGO) Heater - 3.0L 2- and 4-valve engines and SHO
P1138 - Key On Engine Running (KOER) - 3.0L 2- and 4-valve engines
Perceived lack of engine braking - 3.0L 2- and 4-valve engines
Spark knock - 3.0L 2-valve engines
Rolling idle - 3.0L 2-valve California Calibration only
OBDII misfire codes - 3.0L 2-valve 49-State Calibration only
This may be caused by the Powertrain Control Module (PCM) calibration.

ACTION:
Reprogram the PCM. Refer to the following Service Procedure for details.

SERVICE PROCEDURE
Retrieve, then clear DTCs for the PCM continuous memory.
If a DTC P0135, P0155, P1138 (KOER) or OBDII misfire code were present in continuous memory, perform normal diagnostics in accordance with the 1998 Powertrain Control/Emissions Diagnosis (PC/ED) Service Manual.
If the concern is perceived lack of engine braking or spark knock, perform normal diagnostics per the PC/ED Service Manual for these concerns.
If no problems were found after performing Step 2 or 3, no other DTCs were present, and concern is still present, reprogram the PCM with the latest level calibration using Service Bay Diagnostic System (SBDS) or New Generation Star (NGS) Tester. Refer to the following PCM Reprogramming Information Chart to identify the appropriate calibration.

PCM REPROGRAMMING INFORMATION
Application Tear Tag Number NGS/SBDS Qualifier
3.0L 2V AX4S Non-ORVR 49-State TEJ0, TEJ1, VSS0 8-10A Calibration NON-ORVR
3.0L 2V AX4N Non-ORVR 49-State VKX0, VKX1, VKX3 8-10B Calibration NON-ORVR
3.0L 2V AX4S Non-ORVR California XLH0, XLH1, WBB0 8-10T Calibration NON-ORV R
3.0L 2V AX4S ORVR 49-State SRR0 8-10A Calibration ORVR
3.0L 2V AX4N ORVR 49-State RPP0 8-10B Calibration ORVR
3.0L 2V AX4N ORVR California WTT0 8-10T Calibration ORVR
3.0L 4V 49-State YPZ0, YPZ1, YPZ2 8-14A Calibration
3.0L 4V California ZCQ0, ZCQ1, ZCQ2 8-14S Calibration
3.4L SHO California GQD0, GQD1, GDQ2 8-10M Calibration with OD CANCEL


Obtain an Authorized Modifications Decal (FPS 8262 - orderable through DOES II, 25/pkg) and list the date, dealer number, and summary of alterations performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.

cont.....

 

[SHOZ123]

If you think it is fuel pressure you can mount the fuel pressure gage on the windshield wiper and drive around. I did this trying to track down a stalling when coming to a stop. Thought it was the fuel pump.

Turns out I have the rear end jacked up with a forward rake. This would move the gas up to the front of the tank away from the fuel pump pick up when under an 1/8 tank and start sucking air.

Do you have a tune?

 

[Porkchop]

If you think it is fuel pressure you can mount the fuel pressure gage on the windshield wiper and drive around. I did this trying to track down a stalling when coming to a stop. Thought it was the fuel pump.

Turns out I have the rear end jacked up with a forward rake. This would move the gas up to the front of the tank away from the fuel pump pick up when under an 1/8 tank and start sucking air.

Do you have a tune?

yeah, I was thinking of doin the same thing.

I don't have it as a foreward rake, its a level lower.

And I dont have a tune, stock program.

 

[SHOZ123]

Well you need a tune you know......

Other than that the IAC is what is responsible for getting air into the engine when the throttle is closed.

 

[Porkchop]

yeah, I know I need a tune, but don't have $400 for one right now. Unfortunatly the car also needs tires, front brakes, full suspension overhaul and a few others before the modification can continue!!!

Thanks for your help Paul