Will Dirty O2 sensor cause erradic Idle?

[Chrome Moly]

Hey gents, Just wanted to know if a dirty 02 sensor will cause an erradic idle?
Thanx in advance.

Chrome Moly
<font color=green>Resistance is Futile</font color=green>

 

[K5 NUTT]

No...lose of fuel mileage. Check for vacum leaks...check egr with Mity Vac and see if it holds vacum and kills engine at idle....remove and clean IAC motor....and check tbi mounting gasket and for loose bolts.

AZBLAZER

1979 K5
1976 K5 Chalet
1972 K10 Suburban

 

[Steve_87K5]

my idle was not steady just before the temp sensor in top of manifold went totally flakey.

SteveB

 

[River]

Same happend to me, also the coolant temp sensor.

Greetings from Amsterdam,

River `90 K5, 350, TH700R4, NP241, "33, 3.08, 10 bolt F, 10 Bolt R(GOV-Lock)

 

[Steve_87K5]

Hi River! when the temp sensor went bad, my exhaust went black and plugs fouled. Computer thought it was very very cold.

SteveB

 

[realsquash]

Dirty? MY O2 sensor has a thick layer of baked-on mud. If you mean fouled, yes, that can affect idle. But I would suspect other components first, unless you are getting an O2 lean or O2 rich code. R u getting any codes?

Squash
http://www.trailrunners4x4.org/users/realsquash

 

[River]

Steve my idle just kept going from 600 rpm to 1800 rpm up and down think their was a loose contact or something inside the coolant sensor. Service engine soon light came on also. Replaced the coolant sensor and evrything was fine again.

Greetings from Amsterdam,

River `90 K5, 350, TH700R4, NP241, "33, 3.08, 10 bolt F, 10 Bolt R(GOV-Lock)

 

[Chrome Moly]

Where is the Temp sensor located? And how much is it?

Chrome Moly
<font color=green>Resistance is Futile</font color=green>

 

[Chili 87 K5]

The coolant temp sensor is located at the front of the intake manifold. The actual sensor unit is mounted inside the coolant passage, and has a hex nipple adapter which seats it into the coolant stream. There is a plug-in wiring harness connector that hooks it up to the ECM.

PS; the sensor is supposed to be pretty sensitive, so fix it or break it, I say!

Hope this helps!!

Brian 'Chili' G.

 

[hpfire7227]

I had pretty much the same problem, replaced the CTS and nothing happened. I'm still trying to figure it out. I'll let you know what happens.

10 BOLTS O' FUN

 

[realsquash]

OK, what do u mean by erratic? Speed goes way up and down? Just plain runs rough? Surging?

Squash
http://www.trailrunners4x4.org/users/realsquash

 

[Chrome Moly]

Idles @ 800 and then shoots up to 1900 rpm at a complete stop.

Chrome Moly
<font color=green>Resistance is Futile</font color=green>

 

[slodawg]

Hey I hate to even say this but my dads got a 89 F@rd pickup and his is doing the same thing. idle low then go way up. The guy at the ford place said it could be his catalytic converter stopped up not letting the engine breath and exhale right. I dont know if that could cause this or not being as NOTHING I've EVER owned has had one on it. The temp guage has been going crazy lately and he aint thought nothing about that. Maybe this is the culprit. Good to see what ya'll come up with.

<font color=blue>SLODAWG</font color=blue>
http://www.slodawg.coloradok5.com