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Cutting out at Low RPMS

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DrakeC

New member
I have a 2000 Pontiac Grand prix gtp. Yesterday it has started this cutting out problem, it only cuts out for a second then takes off, has no problems at high rpms just low ones. I have one code showing up and its for the rear o2 sensor..the one in the u-bend. the code will not erase just comes right back on when you start the car. I was told the cutting out problem was something other than the o2 possibly being bad, so my friend told me to unhook the mass air flow sensor while its running and see how it acted. It raised the rpms slighty while idling and now no longer cuts out. runs good now..i have no idea what could be the problem and if some how these problems are connected? Also before unhooking the Mass air flow it idled good but once or twice a minute it would stutter and almost die. I have no idea whats going on so any help would be great! thanks.
 


New info- with Mass air flow unplugged it revs and idles terrible but while driving is great. with it plugged in it idles good but cuts out when driving. The "cutting out" is a hesitation for about one second everytime i accelerate, no more than that.
 
Well i took it out and cleaned it with Maf cleaner and still cuts out with it pluged in..my buddy said if i leave it unpluged that within a couple days the system will learn to run good without it, like my idle will get better..is that true?
 


DrakeC said:
Well i took it out and cleaned it with Maf cleaner and still cuts out with it plugged in..my buddy said if i leave it unpluged that within a couple days the system will learn to run good without it, like my idle will get better..is that true?
Click to expand...

not true.

maf unplugged puts the car in open loop. so it runs better. if the maf is bad.


and you dont want to pull the plug off the maf while its running, un plug it while the cars off, then start it up. see how it runs.

you can also check the wires to the maf plug for damage.

id fix the o2 sensor and then go from there. cars run bad when all the sensors fail to communicate. o2 and maf iirc kinda run off each other unless im wrong.
 
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