Interesting, made me go hmmm.

I attempted to ohm test my injectors today.
I removed the battery ground, pulled the harness from the injector, turned my meter on to ohms (tried 200, 1k, 2k, 20k), checked the probes (digital says -1 when touching probes together, analog 0'd out fine.) Put one probe to one side of the injector and the other probe to the 2nd injector.

The analog meter zeros back out, the digital then reads -1, like it does when touching the probes together. Am I doing something wrong here, I can't pull voltage readings from the TPS either. All 8 injectors do the same thing with my meters. Could the meters be fried, any way to check that too?

I'm stumped and appreciate any direction given, thanks guys!

-Res

 

do you have a good battery in the ohm meter?

 

Ok, the meters were bad, bought a new one from Harbor.

Base reading with probes touching on meter got as low as .5, not quite 0 with meter set to 200 ohms.

Please let me know what you think of the readings for ohms, fuel pressure and vacuum. I have done a lot of reading on the site, but just wanted to throw my readings out there. My idle would get choppy, surging from 5-600 to 1-1000 rpm, as soon as pushed down the small lever on the TPS sensor just a small amount, the idle would stop surging about. I removed the IAC motor tonight, and there was a great amount of carbon built up on the cone and on the shaft its self and spring, I'll be cleaning it tomorrow and setting the TPS to the correct voltage.

Thanks again everyone!

---------------------

Rear of Engine
8 - 16.7 ---------- 7 - 16.3

6 - 16.5 ---------- 5 - 16.3

4 - 16.5 ---------- 3 - 16.2

2 - 16.5 ---------- 1 - 16.2
Front of Engine

----------------------

Fuel Pressure

39-40 PSI @ 900 rpm or so.

45 PSI @ 500-600 rpm.

----------------------

Vacuum

12-13 @ 700 rpm.

15-16 @ 900-1000 rpm.

 

Numbers look good ; I'm picking the clogged IAC /TB is your idle problem.Worth cleaning the whole TB

Don't forget to reset the IAC after install
http://www.corvetteactioncenter.com/...and+Idle+Speed

 

I was wondering about a reset procedure, thank you for the link! I'm hoping that was the problem too, I believe I ended up leaving the IAC in the throttle body when I tore the engine down and cleaned things out, springs pretty crusty looking, you know... just wondering, on the charcoal canister, does the gas vent tube go on the top port or the bottom port? I read somewhere else before I believe, but was not 100% sure.

Thanks again!

 

Top port is feed to pass side valve cover for PCV system.
Bottom port is for purge line from canister

 

Well, finished cleaning the IAC and the port inside the throttle body, worked great! Makes a difference to run a bristle brush like the type used for cleaning spray guns and running it through both sides of the throttle body ports for the IAC.

The TPS sensor was very easy to tune, went to .54 volts exactly and the voltage rolled even with the throttle. I believe it ended somewhere around 4.24-4.27 volts at WOT. Idle is perfect, no stalling, no searching for its idle rpm. The throttle response is sharp!