Oxygen sensor bad?
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Oxygen sensor bad?
My 88 302 has trouble starting when hot. It cranks fine, but acts flooded. Yet when I hold pedal to floor (I read somewhere that you don't do that w/EFI!!) it finally starts, and clears itself out (as it if had flooded) Idle eventually smooths out. Then when warm and I lug it in 4th gear at 1500 rpms, it misses badly till rpms build. Also, at rpms above 2500, it will still miss if I push pedal to floor too suddenly.
I had it in shop for other work and to address this problem. It received a "tune-up" and actually ran better for a while. It may have just been coincidence that it ran well after that, because a few weeks later the problem came back.
A friend says that's happened to him several times, and replacing Oxygen sensor fixed it.
Any thoughts on this?? It's an easy enough fix to do.
Paul
I had it in shop for other work and to address this problem. It received a "tune-up" and actually ran better for a while. It may have just been coincidence that it ran well after that, because a few weeks later the problem came back.
A friend says that's happened to him several times, and replacing Oxygen sensor fixed it.
Any thoughts on this?? It's an easy enough fix to do.
Paul
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Joined: Oct 2005
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Changing the O2 is an easy process but you might as well have some fun too - here are a couple of links that explain O2 performance and how to test.
http://www.wps.com/LPG/o2sensor.html
http://www.stealth316.com/misc/zirco...or_testing.doc
One other thought -- how's your cat converter doing ?? You didn't say how many miles on your '88 but the symptoms fit a plugged converter. Punch it out or replace it - depending on the state of you morals and wallet.
http://www.wps.com/LPG/o2sensor.html
http://www.stealth316.com/misc/zirco...or_testing.doc
One other thought -- how's your cat converter doing ?? You didn't say how many miles on your '88 but the symptoms fit a plugged converter. Punch it out or replace it - depending on the state of you morals and wallet.
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Joined: Oct 2005
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1. if you have an 02 sensor problem, you should have a check engine light, thus a code. Try to pull codes
2. the 02 sensor is ignored by the computer until the truck is warmed up, so that doesn't explain your starting issues.
3. I suspect your poor starting and poor running problems have the same cause. I smell electrical...plugs, wires, distributor, ignition coil.
2. the 02 sensor is ignored by the computer until the truck is warmed up, so that doesn't explain your starting issues.
3. I suspect your poor starting and poor running problems have the same cause. I smell electrical...plugs, wires, distributor, ignition coil.
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Your O2 sensor can be going out and not throw a code. The light will come on when the sensor gets to the point that it is so far out of range that the computer cannot ignore it anymore. However, the O2 doesnt seem to explain all the problems, but then again sometimes the bad part isnt that obvious, wouldn't hurt to change it if its the original.
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