First off , Thanks for the reply.
I have only had the car for 7 weeks. Have been trying to fix the 1,500 to 3,000 RPM NO LOAD "surge or gallop" as discussed on my previous posts.
What I have learned:
car has two (2) catalytic converters ,my guess is, trying to get it to pass smog ( previous owner).
The exhaust pressure tube that runs from the EGR valve to the modulator was the wrong type of tube and was swollen and not sending a good pressure pulse to the modulator. Changed the hose , no load surge is gone , but now it has the low RPM miss .Maybe too much back pressure (due to 2 cats) is opening the EGR too soon. Also discussed in previous post , my modulator does not have the "orifice" at the "P" fitting as shown in the diagram you posted. Also I can put a .068 diameter gage pin all the way through both "P" and "Q" on my modulator,My friends modulator only has a .35 hole through it.
My "vent hole" is clear and modulator works per FSM tests.
Does the EGR thermo sensor tell the ECU to turn on the EGR solenoid?
Thank you again
Lon
I have only had the car for 7 weeks. Have been trying to fix the 1,500 to 3,000 RPM NO LOAD "surge or gallop" as discussed on my previous posts.
What I have learned:
car has two (2) catalytic converters ,my guess is, trying to get it to pass smog ( previous owner).
The exhaust pressure tube that runs from the EGR valve to the modulator was the wrong type of tube and was swollen and not sending a good pressure pulse to the modulator. Changed the hose , no load surge is gone , but now it has the low RPM miss .Maybe too much back pressure (due to 2 cats) is opening the EGR too soon. Also discussed in previous post , my modulator does not have the "orifice" at the "P" fitting as shown in the diagram you posted. Also I can put a .068 diameter gage pin all the way through both "P" and "Q" on my modulator,My friends modulator only has a .35 hole through it.
My "vent hole" is clear and modulator works per FSM tests.
Does the EGR thermo sensor tell the ECU to turn on the EGR solenoid?
Thank you again
Lon