code 45 on 90 vette
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Heel & Toe
Joined: May 2004
Posts: 15
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From: Huffman TX
code 45 on 90 vette
im getting a code 45 on my 90 vette... also an intermittant miss under load and at idle.. have replace the dist cap, rotor, wires, egr valve, reset valves and timing to stock specs.
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Joined: Aug 2004
Posts: 95
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From: WALLIS TEXAS
Code 45 Help,oxygen Sensor Circuit, Rich Exhaust.
Originally Posted by SuperDave90C4
im getting a code 45 on my 90 vette... also an intermittant miss under load and at idle.. have replace the dist cap, rotor, wires, egr valve, reset valves and timing to stock specs.
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Code 45 is rich exhaust. My $ is on a leaky injector or a sticking one. Your injectors can be getting pulse fine and not be leaking but sticking open sometimes, then closed sometimes intermittently. About the only way to know for sure about sticking is to listen to them with a mechanics stethoscope at idle. You can listen with a piece of rubber tube in a pinch. Listen for a steady ticking with no pause. Sometimes you have to listen to each injector for several minutes each, at least, to catch it. What happens when injector sticks open is it floods the cylinder momentarily causing the miss and the rich exhaust code.
The way to check for leaking injector(s) is to put a pressure gauge on the schrader valve and see if your fuel pressure drops drastically over say a 40 minute period with car not running. If your smelling fuel in your garage after a nights storage then it's likely you have a leaker or two.
My 90 had the exact symptoms you guys are experiencing and the code 45 and I had 2 injectors sticking intermittently. I threw in a set of the new style ACCEL #24's and she's running like a cat on fire.
The way to check for leaking injector(s) is to put a pressure gauge on the schrader valve and see if your fuel pressure drops drastically over say a 40 minute period with car not running. If your smelling fuel in your garage after a nights storage then it's likely you have a leaker or two.
My 90 had the exact symptoms you guys are experiencing and the code 45 and I had 2 injectors sticking intermittently. I threw in a set of the new style ACCEL #24's and she's running like a cat on fire.
