454 chevy surging and stalling
My friend, who I travel with, has a 1994 chev 454 winnebago brave with throttle body injection. He has had continuous trouble with it and has not been able to solve it, despite many trips to the shop ...
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Surging means it is running lean at idle. I would look for a vacuum leak, or the O2 sensor. I do not believe it is the idle air control valve. The reason is that the idle air control is a very slow moving device, and is not the primary control for idle speed. Normally is goes to a fixed preprogrammed position and doesn't move much. Idle speed is controlled by timing (believe it or not), as the timing can slew back and forth fast enough to make fine corrections in idle speed. But neither one is a likely cause, particularly if it runs normal at higher RPMs.
How far away is the O2 sensor? Is it 4 wires or 3? If it is very far down the pipe, and is 4 wire, that would mean it has a heater. At idle, the air may not move fast enough for it to be warm enough to be accurate. If the heater was bad, it would not work at idle, but probably work while running down the road.
How far away is the O2 sensor? Is it 4 wires or 3? If it is very far down the pipe, and is 4 wire, that would mean it has a heater. At idle, the air may not move fast enough for it to be warm enough to be accurate. If the heater was bad, it would not work at idle, but probably work while running down the road.
