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Unread 04-04-2013, 06:36 PM   #1
Ericgormsenjr
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1987 YJ Wrangler 
 
Join Date: Feb 2013
Location: Moreauville, La
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What's the voltage ?

What should the voltage reading be at the injector on an '87 2.5 with TBI. Mine reads 3.57 is this correct?

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Unread 04-04-2013, 07:18 PM   #2
Que89YJ
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1989 YJ Wrangler 
 
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Location: Detroit, Michigan
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You should have 12 volts. You need to test it with your meter ground to the body our negative battery.
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Unread 04-05-2013, 06:10 PM   #3
Ericgormsenjr
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Location: Moreauville, La
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Thanks que

Just saw your info on the voltage. Would you have any idea why it would be so low? I rechecked it as you said. One side I get no reading and the other I get 3.60 volts. If it is a ground, where should I start looking? So far I've replaced the external in line fuel filter, injector (which I took off and put old one back on b/c it did exact same thing) blew out return line and all ports on TB. I found a used TB complete on eBay and ordered it and am just waiting for it to install. But if its voltage issue I don't know where to look. Thank you for any knowledge you can instill on me to solve this.
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Unread 04-05-2013, 07:00 PM   #4
Que89YJ
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Do a meter check by measuring the battery. Check the voltage with just ignition on not running. Make site your meter is set to dc voltage.
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Unread 04-05-2013, 07:01 PM   #5
Que89YJ
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What is the problem?
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Unread 04-05-2013, 07:12 PM   #6
Que89YJ
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1989 YJ Wrangler 
 
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I can hook you up with the link for both the fuel pressure and the service manual tomorrow. I have them on my laptop. pm me and remind me tomorrow morning. I am on my cell.
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Unread 04-05-2013, 08:11 PM   #7
jsawduste
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Quote:
Originally Posted by Que89YJ View Post
You should have 12 volts. You need to test it with your meter ground to the body our negative battery.
You sure about that ? Are we talking the 5 volt reference that is common to each injector or the signal from the ECM ?

D, I owe you a call and I think something else but for the life of me I cannot recall what it was............
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Unread 04-05-2013, 08:52 PM   #8
Que89YJ
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1989 YJ Wrangler 
 
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Injectors feed off the asd relay. Not the nice pdc setup on the obd1 but yes they are 12
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Unread 04-05-2013, 09:24 PM   #9
jsawduste
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Quote:
Originally Posted by Que89YJ View Post
Injectors feed off the asd relay. Not the nice pdc setup on the obd1 but yes they are 12
Got it, thanks
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Unread 04-06-2013, 07:43 AM   #10
Ericgormsenjr
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Voltage/Fuel and who knows

Que,
I checked the voltage on the throttle body injector and when grounded to frame get a 3.6 reading with only ignition on not running. When I check across injector connection I get 3.57. Can I run a 12v feed from ignition and splice into injector connection?
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Unread 04-06-2013, 11:26 AM   #11
Que89YJ
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did you check the battery voltage to make sure the meter is working?
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Unread 04-06-2013, 02:51 PM   #12
Ericgormsenjr
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reply to Que

Yes, battery voltage is 12.6v. Could I run a 12v source from on position and tap into injector connection?
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