GTcarz  Automotive forums for cars & trucks.


Go Back   GTcarz Automotive forums for cars & trucks. > Car Specific > choose the vehicle > chevy / gmc
Register Forgot Password?
Search

Attachment Gallery Old Gallery

Welcome to GT Carz!

Reply
 
 
 
submit to reddit
 
LinkBack Thread Tools Search this Thread Rate Thread Display Modes
Old 03-25-2008, 04:53 PM   #1
~~ Hardcore Newb ~~
 
jayfrat's Avatar
 
Join Date: Sep 2005
Posts: 49
Rep Power: 333
jayfrat street rep is low. keep going
Way to test optispark and optical sensor?

I have a 94 Camaro LT1 A4 transmission, I'm pretty sure my optispark is shot....again, but before I bring it to a shop so they can have it for a month before they even figure out the problem....again, I was wondering if I could test the opti and the optical sensor myself?

I tested the ICM using the instructions at shbox.com, it said dc volts I should be getting 10 on terminal A and D, I got 11.19 volts on both, I figured that might be fine. On AC volts testing terminal B I should get between 1-4 volts, I got roughly around 2.8-4 but at one point it shot up to 8 volts. I know the voltage in my battery is low but I think I got some clear readings.

So is there a way to test the opti and sensor? I see everywhere problems with bad opti, but is there a way to test it? Is 8 AC volts to much, and or could my battery be giving me false readings?
jayfrat is offline   Reply With Quote
Old 03-29-2008, 05:22 AM   #2
~~ Hardcore Newb ~~
 
jayfrat's Avatar
 
Join Date: Sep 2005
Posts: 49
Rep Power: 333
jayfrat street rep is low. keep going
I realized why I'm having a hard time testing the opti, the pigtail thats on top next to the TPS coming from the opti is missing, when I had my motor swap done back in May of 06 it looks like they took out that pigtail from both sides and just spliced the wires together with some heat shrink.

Any suggestions?
jayfrat is offline   Reply With Quote
Old 04-20-2008, 02:17 PM   #3
~~ Hardcore Newb ~~
 
Join Date: Mar 2008
Location: Langley, BC, Canada
Posts: 33
Rep Power: 241
oxygen454 street rep is low. keep going
shoebox is great for this stuff. Have to tried asking him?
oxygen454 is offline   Reply With Quote
Old 04-20-2008, 02:29 PM   #4
~~ Hardcore Newb ~~
 
Join Date: Mar 2008
Location: Langley, BC, Canada
Posts: 33
Rep Power: 241
oxygen454 street rep is low. keep going
Shoeboxes site says...

If you have good voltage, switch the meter to ac scale and connect test leads to terminal "B" and to ground. Observe meter while cranking the engine. You should see between 1 and 4 volts ac (those are the pulses that trigger the coil to fire).

If you don't see the proper ac voltage the problem could be the optispark, the harness to the optispark, the PCM or any of the wiring in between. Visually inspect all the connections you can get to for poor contact or corrosion.


I also have read the only thing you disconnect is the connector to the ICM, not the opti. Those are the terminals you will be testing, they are labeled. Use the bolt to the right of the coil as the ground. Not sure how well that works but I found that on another forum lol...

Looks like you got most of this info down. Sorry Im not sure if the higher AC would be proper. Sounds kinda off to me. What is your camaro doing? Missfire?
oxygen454 is offline   Reply With Quote
Old 04-20-2008, 02:29 PM
 
 
 
submit to reddit
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 01:27 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Page generated in 0.12384 seconds with 18 queries