Surging Engine
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Junior Member
Joined: Sep 2002
Posts: 53
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From: Pottstown, PA
Car: 1983 z/28 t-top
Engine: 305 Carb LG4
Transmission: 5 speed
Surging Engine
Still trying to diagnose a problem in my 90 Camaro (305/TBI).
Car surges badly under load.. Sort of like someone is pushing the pedal down and then releasing...Real annoying...
Tried a lot already, and NOTHING has helped. New:
02 Sensor
TPS
Fuel filter
wires
plugs
cap
coil
Last weekend I pulled and plugged the line going to the EGR...Runs like a champ! No hestitation, but the Check Engine light comes on...so I figured the EGR was bad. New EGR...runs even worse?
ANY ideas...thoughts...swears...
Thanks
Car surges badly under load.. Sort of like someone is pushing the pedal down and then releasing...Real annoying...
Tried a lot already, and NOTHING has helped. New:
02 Sensor
TPS
Fuel filter
wires
plugs
cap
coil
Last weekend I pulled and plugged the line going to the EGR...Runs like a champ! No hestitation, but the Check Engine light comes on...so I figured the EGR was bad. New EGR...runs even worse?
ANY ideas...thoughts...swears...
Thanks
Thread Starter
Junior Member
Joined: Sep 2002
Posts: 53
Likes: 0
From: Pottstown, PA
Car: 1983 z/28 t-top
Engine: 305 Carb LG4
Transmission: 5 speed
EGR Solenoid?
Vader...Thanks for the reply...Solenoid?javascript:smilie('
')
confused Where?...
Sounds like a plan...
Let me know....thanks again!
Jim
')confused Where?...
Sounds like a plan...
Let me know....thanks again!
Jim
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Joined: Jan 2000
Posts: 19,664
Likes: 313
JLS,
Vacuum to the EGR valve is controlled by the ECM through a solenoid valve. I can't recall exactly on a TBI engine, but I believe the solenoid is mounted near the distributor. There are three connections on the EGR solenoid, but one of them is an atmospheric vent, so only two of the connections are supposed to get hoses. If these hoses are reversed, EGR function will be erratic. If the solenoid is sticking or leaking internally, the same thing will happen.
You can test the entire system with the guidance of this flowchart:
Vacuum to the EGR valve is controlled by the ECM through a solenoid valve. I can't recall exactly on a TBI engine, but I believe the solenoid is mounted near the distributor. There are three connections on the EGR solenoid, but one of them is an atmospheric vent, so only two of the connections are supposed to get hoses. If these hoses are reversed, EGR function will be erratic. If the solenoid is sticking or leaking internally, the same thing will happen.
You can test the entire system with the guidance of this flowchart:
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