Thread: Engine Trouble
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Old 09-09-2007, 07:45 PM
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Putershark Putershark is offline
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Just don't make the mistake like I have in the past thinking that something new is good. There is a huge difference between "new" and "known good" when dealing with wear items such as Batteries, Plugs, and Plug wires so double check them again just to make sure

There is also a difference between checking for a code and a laptop hooked up where you can pull a data dump while watching the total engine sensor operation in real time. Things like a plugged fuel injector or intake leak, can crate a false O2 sensor reading since the engine is running so far out of spec, the O2 sensor throws a code since it cannot make an adjustment due to the engine running so rich or lean (whichever the case). So I take any one code reading with a grain of salt and have been burned more than once because of a loose ground or leaking vacuum line

This also reminds me to also check any vacuum lines and loose AFM (Air Flow Sensor) that may develop a gap (leak) past the AFM as the engine warms up can cause a lean out condition. This and any bolts on the intake manifold that may have backed off some...

Very careful use of some Throttle Body cleaner quickly shot around lines and fittings while the engine is running at idle, this to see if it "sniffs" the cleaner and the engine either speeds up or stumbles can help one find such vacuum leaks. Just be careful doing such and only use tiny little blasts of cleaner (will not take much) so you do not start a external fire
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