- Purpose: To prevent
super-heating of the valves in cylinders 5&6 under high boost conditions, which could
lead to burnt valves. This mod should only be done at the track, as it may cause
part-throttle detonation in some cars.
- Parts Required: two 1/8"
vacuum caps, 10K ohm 1/2 watt resistor (available at Radio Shack), electrical tape.
- Time Required: 5 minutes.
Remove the EGR hose on the driver's-side rear, near the firewall (fig.
Put 1/8" vacuum caps on the two metal tubes that are now open (fig.
2). Squeeze the air out of the caps before inserting.
Unplug the EGR gas temperature probe electrical connector pictured
below. Insert a 10K ohm 1/2 watt resistor into the connector (fig. 3). This prevents a CPU
trouble code from being tripped. Tape the connector with electrical tape to prevent the
resistor from falling out. Just leave the connector dangling.
Note: it is hard to see the electrical connector on 97-98 models because it's located
in the opposite position, between the manifold and engine valve cover towards the back
(firewall) - look for it using a flashlight. A screwdriver will help you unplug the
Thanks to Bryce Danna and Mohd for this tip!