Click here to close
Community Login
username:
password:
 
 

Serving Professional Engine Builders & Rebuilders Since 1964
Survey Results
Which import engine do you build the most?













 
7/1/2008
Click on a thumbnail to see the full-size image
Figure 1

1997-2008 Ford 3.8L, 3.9L and 4.2L Spark Knock Under Light Load and Acceleration



 
Some vehicles equipped with 3.8L, 3.9L or 4.2L Ford engines with Split Port Intake Manifold Runner Control (IMRC) may exhibit spark knock under light load and acceleration. Follow the service steps to correct this condition.

Inspect for disconnected IMRC actuator rods.

  1. Check both right hand and left hand side IMRC rods to be sure they are properly attached to the actuator motor and intake manifold runner.
  2. If the IMRC actuator rods are found to be connected properly, do not continue with information.
  3. If any IMRC actuator rods are disconnected, refer to service manual.
  4. If any IMRC actuator rod linkages are found disconnected, replace all four linkage rod retainers (Figure 1).

Some or all of this information was provided by the Automotive Parts Remanufacturers Association (APRA). For more information on technical bulletins available through APRA call 703-968-2772 or visit www.AutoBulletins.com

 

Additional Tech Tips>>


Comment on this article:
 
A Forgotten Decade: Identifying Cadillac Cylinder Heads From The 1980s
It is easy to lose sight of valuable information from the past. No, I am not talking about the '50s and '60s, although that may be an idea, but what seems to be the forgotten '80s. So much changed during the 1990s, and the proliferation in the new millennium with electronic controls (both engine and transmission) and, of course, OBD have moved us ahead at a breakneck speed....

Valve Timing Basics
In an effort to simplify what actually happens inside an engine, we will discuss valve events, piston position, overlap and centerlines....

Rattle or Knocking Noise from Audi Camshaft Adjuster at Cold Start
A rattle or knocking noise has been reported coming from some 1997-2004 Audi camshaft chain tensioners or camshaft adjuster units during a cold engine start....

Cylinder Head Oil Gallery Cup Plug Service for Chrysler 2.7L Engine
This bulletin provides service information for 1998-2002 Chrysler 2.7L engine cylinder head oil gallery cup plugs....

Eliminating The Low Oil Pressure Gremlin
This solution has been the most effective in solving a problem that seems to creep up for every engine builder everywhere....









Engine Builder is a Babcox Publication
3550 Embassy Parkway
Akron, OH 44333
330-670-1234 • (FAX) 330-670-0874