High or Surging Idle Problem / Dying at Low RPM

New 11/19/2004

Good Morning guys,
Is there a TSB number for the TPS fix for high idle
problem? I have been having this high idle problem for
sometime now and I took it to couple of mechanics and
there were always temporary fixes as you mention in
the website notes, but the problem always came back.
At one point of time, it would die sometimes at very
low speed. Replacing one injector and swapping two
more helped.

It still idles at high rpm 2000-2500 often. I noticed
that adding injector cleaner or fuel gas treatment
helps. I have had to use gas line and fuel injector
cleaners on regular basis to keep the problem in
check.

Last night and this morning my 97 SHO would start, but
would cut out immediately. I could keep it running by
keeping my foot on the gas pedal and the rpm above
500. It would cut out every time that I slowed down. I
managed to drive it home last night. This morning, I
added half a bottle of the gas line treatment since I
did not have a full tank of gas and that got it going.
It is even idling at somewhat normal rpm.

I noticed that changing climates, even going from
southern Ohio to Detroit would cause the engine to run
more rough. The weather changed quickly from a warm
day to a cold night over here.

I have not ignored any of these problems, but they
always been intermittent and could never find a good
reliable mechanic to work on it. the error varied
from a mis fire, to MAF sensor.

I would appreciate any help to get it running right.
Thanks
_________________________________________________________________________
What year? There is a TSB for '98 and '99 SHO's. 00-3-5. Unless your vehicle
is under a Ford warranty, they won't fix it for free.

Throttle Position Sensor - High Engine Idle Speed
Article No.
00-3-5

02/07/00

HIGH IDLE - TAURUS WITH 3.4L SHO AND RANGER WITH 2.5L AND MANUAL
TRANSMISSION

FORD:
1998-1999 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 drivability 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

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty
Coverage And Emission Warranty Coverage

OPERATION DESCRIPTION TIME

000305A Install High Idle Service Kit 0.6 Hr.
(Ranger)
000305B Install High Idle Service Kit 0.7 Hr.
(Taurus SHO)

DEALER CODING
CONDITION
BASIC PART NO. CODE
12B637 30

OASIS CODES: 203200, 617400, 619400

Paul L Fisher
__________________________________________________________________________

It's a 97 right ??
I had the same issue with mine, and had to replace the TPS (throttle position sensor).
This fixed the issue.
Have you changed the TPS ??

Thanks,
Stan Phillips

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