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Originally Posted by compress ignite
DD,
When you push the cruise control lever for Accelerate (Electrical)I.E.
INSTANTANEOUSLY the cruise control MOTOR (Electric) moves the
MECHANICAL linkage[which connects with the "Rack Position Sensor"(
senses the frequency of fuel distribution of the Injector Pump)which
inputs Electrically to the EDS...which CONTROLS the wastegate functions.
Look under the hood ,when you move the accelerator the connection to
the I.P. should move the exact amount AS IF THE CRUISE LINKAGE WERE
PROVIDING THE MOVEMENT.Any difference needs to be adjusted.
The linkage performs other tasks simultaneously,most notably increasing
fuel distribution.
YOU most likely have a LINKAGE problem...Cable,"Doggie Bones",adjustment.
The wastegate on these models begins bleed off of the precious BOOST
long before the set maximum P.S.I.
Even if the system is functioning perfectly.
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Thanks for taking the time to respond !
I will look over linkage adjustments as I don't know what the Rack Posision Sensor or the I.P. is (please tell me more), but as I mentioned I feel it reacts much faster then the CC could even take effect IMO because when I am trying to activate the cruise control it takes several seconds to come in.
I installed a PSI boost gauge last night so I can reference the numbers to all.
40 mph pedal to the floor I have 6 psi of boost(in the no power mode) and as soon as I touch the ACCl. lever, boost spikes near 15 psi settleing back to 12 psi for 5 sec., then drops back to and maintains 6 psi and I've never lifted of the floor.
The 5 sec. of boost before dropping back to 6 psi is a constant if I repeat the test everytime, except during the few times the systems seems to work properly.
Most of the time, the very first time I floor it from a stop the boost with spike to 16-17 psi then fall back and maintain 10-12 psi as long as I keep accellerating (when boost is working anyway), but some, half or all of the time when I lift off the gas and then hit it again it will max out at 6 psi which really offer's no extra accel.
I seem to be seeing something new too, at a steady state of accellerating the boost will climb and drop in equal multi sec. cycles between 7-11 psi.
Is the waste Gate normally Open or Closed ? Most US systems I've worked on(non-diesel) are normally closed and a boost setpoint opens it.