 Fuel injector voltage, Correct reading? |
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| timofly |
 Dec 5 2016, 03:31 PM
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#1
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Member  Group: Members Posts: 164 Joined: 21-February 09 From: VA Member No.: 10,082 Region Association: MidAtlantic Region  |
My 2.0 with stock fuel injection has a consistent missing at idle and all engine speeds. At idle, disconnecting the wire to the #1 fuel injector makes no difference, but disconnecting any other injector wire makes problem much worse and eventually stalls the engine.
The voltage reading from the #1 injector input plug varies from .19 to .28 volts at idle. That doesn't seem like much, but what should it be? (I didn't test another cylinder because I ran out of time to fool with it today.) Plugs are new and valves have been adjusted. Seems pretty clear that the problem is at #1 cylinder. |
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| Spoke |
Dec 5 2016, 09:01 PM
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#2
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Jerry Group: Members Posts: 6,979 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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You can use a voltmeter if you integrate the pulse width over the period from one pulse to another. If you assume the pulse width is 1/10th of the period, then the average dc voltage measured would be 1/10th of the pulse voltage or .28x10=2.8v.
Best to check the other injector voltages. You could Swap injectors and see if the failure follows the injector or is the connector. |
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Posts in this topic
timofly Fuel injector voltage Dec 5 2016, 03:31 PM
The Cabinetmaker Just check the voltage on the others and compare. Dec 5 2016, 04:45 PM timothy_nd28 You will need a oscilloscope if you want to measur... Dec 5 2016, 07:29 PM reharvey The injectors operate at 3volts. Got that info fro... Dec 5 2016, 07:56 PM
timofly
The injectors operate at 3volts. Got that info fr... Dec 5 2016, 08:33 PM walterolin The signal is a pulse, nd28 is likely correct - yo... Dec 5 2016, 08:47 PM timofly
You can use a voltmeter if you integrate the puls... Dec 8 2016, 08:16 PM Frankvw Hi Timofly, you guys have Mr.Injector (*) in USA, ... Dec 9 2016, 02:54 AM timofly
Hi Timofly, you guys have Mr.Injector (*) in USA,... Dec 9 2016, 10:38 AM |
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