Readings gone bad

Bumpysbro · Post by **Bumpysbro** » August 30th, 2007, 11:37 pm

hey guys im kind of in the dark on this one. i thought my multimeter was bad because i was getting some weird readings when i testing my maf, o2, and spark plug wires. heck even the distributor that i just got from autozone tested bad on the primary coil. and i have not even installed it yet. but we tested a 102v on our 120v power outlet but it had the lights on so thats about right, get a 1.5v from a AA battery and 12.6 from our batteries. i mean whats the odds of all these components being bad, most of them are new and un used especially the o2 sensor. getting a 16.8ohm reading when it should be 6ohms. getting a 1.56ohm reading on my coil. which means its gonna be getting alot more current then its supposed to. if you have any thoughts it would be greatly appreciated because i dont think our meter is bad. thanks
Jon

Bumpysbro · Post by **Bumpysbro** » August 30th, 2007, 11:50 pm

oh ya just to add i tested the resistance on the fuel injectors. all 4 getting 14.3 ohms across the board. very strange i bought the maf used, the o2 sensor new from online and the disty from autozone. but that would explain why my coil's keep burning out.

Volones · Post by **Volones** » August 31st, 2007, 1:35 pm

The resistance and voltage measurements on your multimeter are totally different circuits. The resistance circuit should have its own power supply, which could be causing your problem (keyword - could).

I would test the meter on a known resistor to see if it's reading correctly. Just because the voltage reads right doesn't mean the resistance will also.

GL,
Vol

Bumpysbro · Post by **Bumpysbro** » August 31st, 2007, 1:48 pm

well i tested the injectors and some other stuff with the ohm reader and seemed to be right. ill try some other stuff thanks for the reply

Volones · Post by **Volones** » August 31st, 2007, 4:27 pm

since the other readings seem to be correct, I'd take the parts back to the store and show them what's wrong. I'm sure they have a multimeter to check them out there also, which will either verify or correct your readings, and if they are bad, you can replace them right away.

Vol

Tunes67 · Post by **Tunes67** » August 31st, 2007, 4:53 pm

I'd also add here that cheap meters give cheap results. I have a cheap meter and I also have a Blue Point digital meter (snap on brand). The Blue Point meter is much more precise than the cheapy I got from Home Depot LOL. Long story short.. get a good quality meter if you dont already have one.

Tunes67

Bumpysbro · Post by **Bumpysbro** » August 31st, 2007, 5:06 pm

very true you get what you pay for most of the time. the one im using is a Actron CP7677 DVOM. its kind of old but its still going for 45 bucks on ebay. it seems to be good but ill take it down to when i go to auto class. see what the intructor says. thanks guys
Jon

xboxlivemonkey · Post by **xboxlivemonkey** » September 1st, 2007, 1:14 pm

maybe the decimal points are placed correctly

Bumpysbro · Post by **Bumpysbro** » September 2nd, 2007, 5:07 pm

thats what i was thinking, but i tested some other stuff like the iac valve and the egr valve and some spark plug wires that are new and they came out perfect. so i guess buying a maf on ebay and a cheat 40dollar o2 sensor doesnt work out too well haha.

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Readings gone bad

Readings gone bad

check yer meter