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Is it the oxygen sensor?
Needing a coroboration of opinions here...
200,000km/120,000Mi. on a 97 SL1 which has had amazingly little trouble. But the "Service Engine Soon" light is now lit steadily and I haven't driven it through a puddle and it's the same low grade gas I've been using for the last few years. The plugs were changed 15,000Km ago when it started to sputter going up minor hills and PCV valve too was changed then. Wires are the same Mangacore ones that I put in at 100,000Km ago. Starts have been funny over the last few months in that it doesn't necearily start on the first turn and I could hold the key there for a while and get nothing, but if I let go and try it again, it starts immediately. Also, if it did start after holding it for a while, the start is kinda rough and sputtery. From my RC airplane days, that was always a sign of too rich a mixture. Hence I'm guessing O2 sensor. Also, anyone know a rough estimate on cost for one of these things? Cheers |
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Bill ing wrote: > > Needing a coroboration of opinions here... > > 200,000km/120,000Mi. on a 97 SL1 which has had amazingly little trouble. > > But the "Service Engine Soon" light is now lit steadily and I haven't driven > it through a puddle and it's the same low grade gas I've been using for the > last few years. > > The plugs were changed 15,000Km ago when it started to sputter going up > minor hills and PCV valve too was changed then. Wires are the same > Mangacore ones that I put in at 100,000Km ago. > > Starts have been funny over the last few months in that it doesn't necearily > start on the first turn and I could hold the key there for a while and get > nothing, but if I let go and try it again, it starts immediately. > > Also, if it did start after holding it for a while, the start is kinda rough > and sputtery. > > From my RC airplane days, that was always a sign of too rich a mixture. > Hence I'm guessing O2 sensor. > > Also, anyone know a rough estimate on cost for one of these things? The O2 sensor has no impact on the start-up. In fact, the computer doesn't even use its output until the engine is warmed up. The start problems sounds more like a fuel pressure problem. When you turn the key, the fuel pump only runs for a very breif period unless the engine starts. If the pump is weak, or the the system isn't holding pressure when the engine is turned off, then there might not be sufficient fuel available to start the engine during the breif period of fuel pump operation during the start sequence. Going through the starrt sequence a second (or third or fourth) time gives you another shot of fuel. Since you got one shot of fuel from the first start attempt, the second (or further) attempts can provide enough fuel to start the car. Another fuel system problem that can cause start problems is a leaky injector. These can hurt in two ways -1), a leaky injector(s) allow the fuel system pressure to bleed off, causing the problem discussed above, usually after a long period of the car setting, and 2) they can casue one cylinder to be flooded out - usually after a shorther period of setting and followed with a black cloud of smoke when the car actually starts. I suggest that you need to have your fuel pressure checked. If the pump is going bad, you can have insufficient pressure, leading to hard starting, and a lean mixture. Regards, Ed White |
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