240 upstream oxygen sensor connection
#21
06-19-2020, 11:04 AM
.... Also, about the MAF, I have no idea how this thing works or what it does. But I when looked at the insides of in comparison with the old unit, they looked very different. Perhaps I should post a picture. But could that be due the new part not being the right match, or is that due to damage on the old part? I might have some time this morning. I'll take the old one off again and try starting it up. While I am doing that I will get some pictures of them and post here.
#22
06-19-2020, 12:00 PM
I put the new MAF on in place of the old one, with which the car starts but stalls at times. With the new MAF, car wouldn't start. I took it off. Will put the old one back on. I assume the MAF is not the problem, but I can't figure out why the new one makes the car not start. The old one is Bosch #0280212016. The new one is Professional Parts Sweden #87437020. I can't find out how to see if these are equivalent parts.
Also, I finally found the ECU codes in my shop manual. 1-1-3 in the book indicates a problem with the fuel injectors. My previous info came from a website. Should I go with the codes in the Haynes book I am using? Is there a better list of codes somewhere?
Also, I finally found the ECU codes in my shop manual. 1-1-3 in the book indicates a problem with the fuel injectors. My previous info came from a website. Should I go with the codes in the Haynes book I am using? Is there a better list of codes somewhere?
#23
06-19-2020, 03:08 PM
I use this site's table, it has been accurate so far.
https://www.volvoclub.org.uk/faq/Eng...InjectionFault
on LH 2.4, that code means the engine is either too rich or too lean. too rich can mean the MAF is reading more air then is actually traveling through it, or it can mean the OX sensor or wiring is bad . too lean can mean the MAF is reading less air than actual, or it can mean there is an air leak somewhere in the system between the head and the MAF, or a bad OX sensor (or o2 sensor wiring). oh, exhaust leaks before the OX sensor can also cause one or the other of these, at low throttles, the exhaust leak will suck in more fresh air, diluting the exhaust and messing with the readings.
you should clear the code, ensure its 1-1-1 after clearing, then drive it some more and check again.
https://www.volvoclub.org.uk/faq/Eng...InjectionFault
on LH 2.4, that code means the engine is either too rich or too lean. too rich can mean the MAF is reading more air then is actually traveling through it, or it can mean the OX sensor or wiring is bad . too lean can mean the MAF is reading less air than actual, or it can mean there is an air leak somewhere in the system between the head and the MAF, or a bad OX sensor (or o2 sensor wiring). oh, exhaust leaks before the OX sensor can also cause one or the other of these, at low throttles, the exhaust leak will suck in more fresh air, diluting the exhaust and messing with the readings.
you should clear the code, ensure its 1-1-1 after clearing, then drive it some more and check again.
#24
07-01-2020, 03:28 PM
and, the CPS is on the back of the engine, stuck through the transmission bell housing, on the intake manifold side of things... its wire can deteriorate with age, and if it was disturbed, it could fail. without the CPS you would not get any spark OR fuel injection as its the source of all timing.
Hoping for the best.
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