just a 22re

ok so i was driving and i saw that its running lean like no other not going to rich no mater what i do then the check engine light comes on and about 2 minutes later it goes out and i pull over check everything and everything fine then i get back in and shes a ok nothing runniong lean to rich then it does it again check engine lights on and shes running lean then the light goes out and shes is still lean i tryied pulling the coes and all i got with engine running is code 5 she blinks 5 times then stops then 5 times again and she keeps doing that im going to go and try to get some kind of code with just the key on and see cause i tried last time and got nothing and ideas what could be doing this????

just a 22re

ok update o2 gauge was not grounded right so now i wanna know what and why the check engine light is coming on and then going off and i just tried to pull the code there was nothing how long are you going to wait to have the light come on??? what do i do im pulling all my hair out!!

abecedarian

o2 gauge? how is it wired? do you have 2 o2 sensors or 1 and the gauge piggybacked?

just a 22re

i have one 02 cencer and the air fuel gauge spliced into it and its been in there for 2 years now never had a problem with it and i just checked it out and it works just fine


maybe its to egr??? if so how do i unplug it and where just to make sure does the egr block off cause a check engine light?


this is the first time its ever been on in the 3 years ive had the truck!!!

abecedarian

well it's no wonder you'd get a 5 for an O2 fault if you've got a gauge piggybacked off the one sensor and the gauge has a poor ground. remember electricity takes the shortest path to ground right? so the gauge is going to attempt to ground however it can and that O2 lead back to the ECU is a possible path in parallel with the 'bad' ground of the gauge itself.
Combine the O2 sensor signal with the voltage from the gauge that is trying to find ground and it will throw the O2 reading to the ECU off and trip the CEL.
Make sense?

just a 22re

ahhhhhhhhhhhhhhhhhhh but it came on and then went off like 30 secs later

and when the key on motor off no codes nothing key on motor running is were i got the 5 flashes then a pause and then 5 flashes like its tell me its in base timing

abecedarian

since you fixed the ground it is still doing it, that's what you're saying?
if so, put a 1N4001 diode between the gauge and the O2 sensor with the end nearest the stripe around the body of the diode wired towards the gauge and the other end wired to the tap to the O2 sensor

just a 22re

ill find out in about an hour when we run to new london if it does it on the way there ill deff let you know cause if it does then the only thing i can thing\k of is the egr but not sure

that and when i start it when its cold and warm it misses really bad but then like 15 secs later its all good again not sure what theat is but ill seee if its still doing that in a few when we leave

just a 22re

ok were going now so ill post if it does it again or not thanks man your helping me real good right now as this is our dd

just a 22re

ah fixed!!!!!!!!!!!!!!!!!!!!!!!!!!


thanks man and yes it was the o2 gauge trying to ground though the ecu cause now that it has a good ground its working right and no goofy start up and no more check engine lights wow my truck is so smart that it pops the check engine light when my air fuel gauge is'nt working right ha ha