Pinto efi O2 sensor issue/question
My Pinto engine struggles to tick over and when throttling the engine splutters and tries to die.
Very must much like the timing is miles out, but it's not.
Was running fine.
I suspected the O2 sensor so disconnected it and the engine runs fine.
My question is is this a good indication the sensor needs replacing or could this be masking the real issue?
I don't think the sensor will come out without being butchered so want to be sure before I attempt to remove it.
Thanks Po79.
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Re: Pinto efi O2 sensor issue/question
if the engine runs fine with the o2 sensor disconnected theres a strong chance its at fault
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Re: Pinto efi O2 sensor issue/question
Thanks Graham,
I'm hoping that's the case but over the weekend I'll reconnect it and then disconnect the other sensors one by one and see if that shows up anything.
I'll be reporting back!
Cheers Po79.
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Re: Pinto efi O2 sensor issue/question
Started it over the weekend and it spluttered and died like expected.
Disconnected the O2 sensor and it ran fine.
Reconnected the O2 sensor and disconnected the tps and the engine ran fine again.
Did the same for MAP? sensor and other sensors that I can remember the names of either all with the same results.
I ran the engine in-between disconnecting each sensor to be sure the engine still ran rough which it did.
Now the strange but is I have an old MAP sensor that I replaced with the new and current one that's been on the van for a couple years and the engine ran fine.
So obviously I thought I'd found the issue.
However I reconnected the new one on the van and the engine ran fine this time.
It's almost like connecting the old sensor that I thought was duff and then reconnecting the one on the van has somehow reset the issue.
I'm pretty sure this can't happen so maybe the problem was a dirty connecting??
It's the only thing I can think of.
Any thoughts?
Cheers Poe.
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Racer
Re: Pinto efi O2 sensor issue/question
Wouldn't be the first time disconnecting and reconnecting sensors / plugs / equipment mysteriously fixes things!
It becomes second nature with electrical problems on bikes, these are obviously more prone to effects of environmental corrosion!
Preventative maintenance - disconnect any plug & socket, squirt of contact cleaner, make & break several times, add dielectric grease or Vaseline - that should help.
Last edited by katana; 05-04-2022 at 18:45.
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Pit Crew
Re: Pinto efi O2 sensor issue/question
The lambda controlled EEC-IV will use a set value when a sensor is disconnected, that's why it may run OK when you take something away.
Corroded connectors can surely be a thing but it may also be wise to let the engine control "re-learn" when you have swapped stuff around. The general procedure is to disconnect the battery for a while (30 minutes or so), then start the engine without moving the throttle and let it idle for a while. As it re-learns, the revs usually vary a bit before it settles.
Gustaf
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