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Bogging issue on 92 metro
Topic Started: Feb 4 2010, 07:46 AM (3,060 Views)
Bad Bent
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Facetious Educated Donkey

juggalo_joker89
Feb 8 2010, 08:42 AM
also i asked what all he did to the car before it started to bog, and he told me nothing, but after it started he told me he did these things: removed tank and cleaned it, replaced vacuum lines, replaced o2 sensor, tried to clean carb
I'm gonna do the o2 sensor check with the DVOM as mwebb said today.
can I ask, would a vacuum leak cause the loss in power? just curious.
also another thing, could the p and q do anything if the egr transducer is backwards? Someone else recently had the same problem and that was the cause of it.
Removed tank? As in gas tank? ...New fuel filter.
Check all your vacuum lines.
You're already on the O2 sensor, :thumb

Well, as minding your p's and q's goes, reverse them and see what happens.
This is under the hood of the '96...
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juggalo_joker89
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ok i have a digital multimeter, i set it on 20 (goes from 200m, 2000m, 20, 200, and 1000) and i did my test, now when i finally got it to give me a reading it was jumping from 40-55 but usually around the 50's. when i went WOT it didn't change from that 50's range. am i doing this wrong? if i am then ill just get my dad to do it for me and see what happens.


yeah i guess he removed the gas tank and cleaned it lol, i know that the seat wasn't properly put back in cause the front hooks aren't securely in place.

what did you mean by "your already on the o2 senser"? lol giving me thumbs up for having a new one and know its not bad?

and thanks for the pic, but i did have it hooked up right, also i switched the p and q around and it didn't do anything at all.
Edited by juggalo_joker89, Feb 8 2010, 01:14 PM.
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Facetious Educated Donkey

juggalo_joker89
Feb 8 2010, 01:11 PM
what did you mean by "your already on the o2 senser"? lol giving me thumbs up for having a new one and know its not bad?
Usually the first thing I look for if there's a problem is what was last done to the engine, and it could be a combination of the last two things or a simple mistake. Read: What I've done and a combination of things I did.

The PO listed 4 things, one of which was the O2 sensor. You said "I'm gonna do the o2 sensor check with the DVOM as mwebb said today." So you were already redoing one of the items the PO had worked on. IMHO that's a good thing. ie thumbs up.

If you find that the PO had done most of it correctly you might eliminate a bad ground or improperly installed gas tank/fuel pump. But if there's a chance that the tank was cleaned needlessly because the fuel filter was dirty, lines clogged or EVAP system clogged then there's a list of suspects. Or was the tank full of bad/old gas, water, rust yeda, yada, yada.

mwebb's mantra is "test, don't guess" (from my memory) and I think "What did I screw up last time I was in here." :banghead ...then test.
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mwebb
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...."ok i have a digital multimeter, i set it on 20 (goes from 200m, 2000m, 20, 200, and 1000) and i did my test, now when i finally got it to give me a reading

it was jumping from 40-55 but usually around the 50's. when i went WOT it didn't change from that 50's range.

am i doing this wrong? if i am then ill just get my dad to do it for me and see what happens."....


so i assume you mean
from .40v to .50v or 400mv to 500mv on the signal wire to the 02 sensor tested when hot or at operating temperature .

i would set the DVOM to 2000m which would be the
0 to 2000mv or 0 to 2v scale since the 02 sensor operates from 150mv to 850mv in a perfect world
you want the meter to be set to the scale that just brackets the range the known value will be that you are measuring

the 02 sensor at hot 2k rpm must cycle from 150mv to 850mv in 100ms or less and back in 100ms or less
this will appear as a blur on the DVOM
many DVOMs have a bargraph under the display that is like an analogue meter .... does yours ?
if you have a min / max function on your DVOM , use it

IF
your 02 sensor is showing you 400 to 500mv when hot at 2k rpm
the 02 sensor is bad
or
it is a 4 wire 02 sensor and the heater circuit is not powered up
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right click on image - select view image - click 2x to expand image

scan data graphed for known good 02 sensors - the DVOM can not graph , but will randomly pick a data point and display the voltage depending on the update rate for the display
the display updates every so often , say 100ms , so 100ms could be the update rate , or not
depends on the DVOM ...
the DVOM may display a blur , or the values will be cycling at the speed of the update rate for the particular DVOM
Edited by mwebb, Feb 9 2010, 01:02 AM.
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