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check engine light intermittent
Topic Started: Jun 9 2012, 12:10 PM (2,512 Views)
djangomozart
Advanced Member
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OK , still have this problem and I'm abandoning any sense of pride . Alright, who wanna hold my hand through this this time ?
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djangomozart
Advanced Member
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Sorry, title is incorrect . Check engine light always on . PO134 and PO171 . I didn't find any bad connections, but then again when it comes to electrical diagnosing , I just don't wanna do it . Of course, I do or wouldn't have written that . I know I can do, I'm just using faulty logic to do so . I've read and watch everything y'all have posted but to no avail . Basically, I'm just looking for a short in the O2 circuit. O2 sensor is new and I have tested continuity between my solder-job and the plug-in and THAT is good . But testing the rest of the circuit looks like WTF . Am I testing for voltage or continuity ? Any help appreciated .
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Bad Bent
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Facetious Educated Donkey

Here are some links I have on testing the O2 sensor...
http://geometroforum.com/topic/2703156/1/
post #19: http://geometroforum.com/topic/2703156/1/
O2 sensor cycle: http://geometroforum.com/topic/2703156/1/
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djangomozart
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Thanx again Bad Bent n cheers on the hopmobile . So SoCal .
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djangomozart
Advanced Member
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Oh yeah, and the idiot light went out last night . and stayed off this morning . It's still off . I didn't work on the car for at least the last two days , so I dunno. Not too much humidity .
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djangomozart
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Light came back on in afternoon when it dried-up.
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Old Man


bad ground somewhere? damp means water bridge making connection, dry means check engine light on??
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djangomozart
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grounds . I can think of 3 , but there's more, right ?
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idmetro
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Grounds I know of:

Back of intake manifold
Distributor body to firewall
Battery to transmission
Headlight to fender (one per side)
Under dash drivers side on A pillar

Likely there are others. I would start by cleaning the ones in the engine compartment since they are more exposed and more likely to have issues. Good Luck!
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djangomozart
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Thankyou idmetro . Leavin' it til tomorrow, or maybe longer .
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djangomozart
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Light still on . I scratched-up both on intake manifold, distrib. to firewall including connector,battery to trans. and battery to front piece ( whatever it's called ) and both headlights to fenders . I'll get the one under the dash tomorrow . Anyone know of any others ?
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Woodie
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Might take some driving for the light to go out, unless you disconnect the power to the PCM.

Those two grounds on the inner fenders are for the turn signals and corner lamps, no connection to the headlights at all. That has no bearing on your problem, but I thought I'd mention it since there are so many headlight problems and so little understanding of the weird way Metro headlights are wired.
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djangomozart
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Thanx for headlight heads-up Woodie . So. I should just take the ground off battery and take it from there ?
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djangomozart
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OK, did that , but light came back on . Where am I looking above the fuses for that last ground ?
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djangomozart
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I'm ready to take a schpritz bottle to this thing to find that short .
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