OK
I am really hoping for some technical help here.
Jamie, you were right, it still does it
Since I installed this ( nothing stock) engine, I have been plagued with a small drivability issue.
Everything is going great, no CEL, good gas mileage, great performence etc.
However, when driving at highway speed, then needing to slow down, upon deceleration my engine wants to surge. Lifting from throttle, when engine speed slows to 1000 rpm's, it will rev to about 1700, back down, back up, until either transmission is shifted to neutral, or vehicle is slowed to below 10 mph in drive, at which time the idle will stabilize.
vroom, vroom, vroom vroom, when I slow from speed---get it?
So, I first thought IAC
disconnected it, CEL on and still vroom vroom when slowing
new TPS installed
vroom vrooom vrooom
I then drilled 1/8" hole in throttle butterfly to facilitate lower TPS voltage at idle
vrooom vrooom vroom
so to be sure I installed a new intake manifold gasket and fuel injector o rings
vroom
T/M headers to fix the ticking ( maybe a leak getting in?)
vroom
:fire:
I conferenced with Jamie on vacuum diagram, to double check.
I did find a few things " reversed"
vrooom
:fire:
When the Rpm's rise, vacuum goes down, and vice versa.
both needles bounce opposite of each other, until it stops revving
This tells me something is opening to allow vacuum pressure loss
EGR!!!!!!
I installed a 1 way vacuum valve to the EGR valve. I was hoping to lessen the vacuum pulse to it. It seemed to help momentarily, however, being a 1 way valve, it builds a vacuum. It ended up holding the egr valve open.
When I removed it I could hear the valve close as the presure was released--
Could it be my EGR vacuum solenoid freaking out?
My next step---remove vacuum line from EGR valve- plug it and road test???
HELP
Once, due to the revving, my wife slowing for a curve, the engine died because of it.
Not good when my woman looses power accessories,
other than this issue, it is woman tame
BTW
I am in no way interested in bypassing the EGR circuit.
I am really hoping for some technical help here.
Jamie, you were right, it still does it
Since I installed this ( nothing stock) engine, I have been plagued with a small drivability issue.
Everything is going great, no CEL, good gas mileage, great performence etc.
However, when driving at highway speed, then needing to slow down, upon deceleration my engine wants to surge. Lifting from throttle, when engine speed slows to 1000 rpm's, it will rev to about 1700, back down, back up, until either transmission is shifted to neutral, or vehicle is slowed to below 10 mph in drive, at which time the idle will stabilize.
vroom, vroom, vroom vroom, when I slow from speed---get it?
So, I first thought IAC
disconnected it, CEL on and still vroom vroom when slowing
new TPS installed
vroom vrooom vrooom
I then drilled 1/8" hole in throttle butterfly to facilitate lower TPS voltage at idle
vrooom vrooom vroom
so to be sure I installed a new intake manifold gasket and fuel injector o rings
vroom
T/M headers to fix the ticking ( maybe a leak getting in?)
vroom
:fire:
I conferenced with Jamie on vacuum diagram, to double check.
I did find a few things " reversed"
vrooom
:fire:
When the Rpm's rise, vacuum goes down, and vice versa.
both needles bounce opposite of each other, until it stops revving
This tells me something is opening to allow vacuum pressure loss
EGR!!!!!!
I installed a 1 way vacuum valve to the EGR valve. I was hoping to lessen the vacuum pulse to it. It seemed to help momentarily, however, being a 1 way valve, it builds a vacuum. It ended up holding the egr valve open.
When I removed it I could hear the valve close as the presure was released--
Could it be my EGR vacuum solenoid freaking out?
My next step---remove vacuum line from EGR valve- plug it and road test???
HELP
Once, due to the revving, my wife slowing for a curve, the engine died because of it.
Not good when my woman looses power accessories,
other than this issue, it is woman tame
BTW
I am in no way interested in bypassing the EGR circuit.