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injector wire tach, mazda rx8

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=105839
Printed Date: May 21, 2024 at 5:18 AM


Topic: injector wire tach, mazda rx8

Posted By: Thack79
Subject: injector wire tach, mazda rx8
Date Posted: July 01, 2008 at 2:46 PM

using a python (or any DEI product) for an RX8. my question is is there some setting that I need to use on the alarm because my injectors read about 3 volts. a normal tach wire that ive used on other cars is 12 volts. can someone give me some guidence.  Voltage sense didnt seem to work for me.

Thanks




Replies:

Posted By: fcss
Date Posted: July 01, 2008 at 3:40 PM

Doing tach is the better way in my opinion, BUT at my shop my boss said that we didnt have to do tach, so I been doing voltage for the last 6 years some say it wont start in the cold but we dont have any problems, But when I do a job on the side I do tach unless its really hard to get to, but like 99 percent of the time I do tach. 

To change a dei piece to Voltage change step 2 to voltage and  always set the crank time to 1.0 which is normally step 5, thats what i have always set it to and the cars dont come back. 

the tach wire for the rx8 from 04-07  i believe have not changed its the wire thats not BLACK/ white, black or WHITE/ blue at the injector or the ignition coil.





Posted By: howie ll
Date Posted: July 01, 2008 at 4:54 PM
Set the black probe of your meter on the preferred wire, place red probe to batt + and set meter to AC. Start engine and probe will read about 3VAC rising slightly if you rev up.




Posted By: Thack79
Date Posted: July 01, 2008 at 7:21 PM
using the green wire so i must have the right one at the fuel injectors. will give both a try. thanks guys.  howie so what your saying is the injector wont read 12volts it will read a lower amount and rise as i rev it up?




Posted By: Thack79
Date Posted: July 01, 2008 at 7:41 PM

tested it. and didnt get anything with ACV. with DCV i got 12 volts off. with it running got up around 13. this sound right???





Posted By: joch1314
Date Posted: July 01, 2008 at 7:49 PM

you want to measure a tach wire with AC voltage, and it'll read between 1 and 7 volts AC....

strange that you've used DC voltage before and got it to work! 



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...half of the truth can be worse than a lie. <----Roger Russell said that..




Posted By: Thack79
Date Posted: July 01, 2008 at 7:59 PM
to be honest. ive never had to measure the tach signal. i just knew i was the right wire cause ive worked on the cars ive worked on. this however is my own.  i had the leads on backwards. measured about 28 (200 setting) and reamained around that number. reving didnt seem to have an effect.




Posted By: cmhayden83
Date Posted: July 05, 2008 at 8:08 PM
put the alarm feature on voltage then on low voltage and this should be the trick

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chuck





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