surging idle problem 96 4.0
#1
03-30-2007
Join Date: Apr 2006
Location: Harrisonburg, VA
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
surging idle problem 96 4.0
My 96 4.0 is having a problem with the idle jumping back and forth between 500-1500 RPM. from searching, ti seems people have had this problem due to everything from MAFs to vaccume leaks. Id like to start by cleaning the IAC. anyone got a picture of where the IAC is in the engine bay? also, the PCV valve while were at it, since ive got a new one.
#2
03-31-2007
I have this problem also, I'm going to try a new MAF soon. I tried a new IAC nothing and searched for vacuum leaks but ran out of time. The IAC is located on the driver's side of the throttle body, looks like a short cylinder about 1 inch in diameter. The PCV is located on the driver's side valve cover at the rear (close to the firewall). You will see a short black line running to it from the intake manifold, a flash light will help you on that one.
#3
03-31-2007
Regarding the '97 4.0L and idle problems, another thing to check is the fuel supply manifold (a/k/a/ fuel rail) gasket per the Ford TSB.
Article No. 98-6-8
LIGHT TRUCK: 1997 AEROSTAR, RANGER
This TSB article is being republished in its entirety to correct the part number listed, revise the Service Procedure, and add Aerostar.
ISSUE:
A rough idle, stalling at an idle and/or Diagnostic Trouble Codes (DTCs) P0171, P0174, P1131, and/or P1151 may be stored in memory on some vehicles with a 4.0L engine. This may be caused by the gasket located between the fuel rail and lower intake manifold losing its compressive loading and becoming drawn into the intake manifold runners resulting in a vacuum leak.
ACTION:
Replace the fuel rail-to-intake manifold paper gasket with a revised gasket. Refer to the following Service Procedure and the 1997 Ranger or Aerostar Service Manual for removal and replacement procedures...
PART NUMBER / PART NAME
F8PZ-9E436-AA / Fuel Rail-To-Intake Manifold Gasket
LIGHT TRUCK: 1997 AEROSTAR, RANGER
This TSB article is being republished in its entirety to correct the part number listed, revise the Service Procedure, and add Aerostar.
ISSUE:
A rough idle, stalling at an idle and/or Diagnostic Trouble Codes (DTCs) P0171, P0174, P1131, and/or P1151 may be stored in memory on some vehicles with a 4.0L engine. This may be caused by the gasket located between the fuel rail and lower intake manifold losing its compressive loading and becoming drawn into the intake manifold runners resulting in a vacuum leak.
ACTION:
Replace the fuel rail-to-intake manifold paper gasket with a revised gasket. Refer to the following Service Procedure and the 1997 Ranger or Aerostar Service Manual for removal and replacement procedures...
PART NUMBER / PART NAME
F8PZ-9E436-AA / Fuel Rail-To-Intake Manifold Gasket
#4
04-02-2007
Thread
Thread Starter
Forum
Replies
Last Post
optikal illushun
4.0L OHV & SOHC V6 Tech
5
11-18-2019 09:22 AM
dunerider09
4.0L OHV & SOHC V6 Tech
10
10-29-2011 08:32 PM
barrman
2.9L & 3.0L V6 Tech
10
11-15-2007 05:11 PM
whiteranger
DOHC - 2.3L Duratec / Mazda L Engines
5
06-12-2005 06:45 AM
