 Fuel injector gone bad |
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| troth |
 Jun 21 2017, 09:28 PM
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Member  Group: Members Posts: 160 Joined: 17-August 16 From: CT/WA Member No.: 20,305 Region Association: None  |
Vehicle was running great until I lost cylinder no. 2! Verified spark was good. Hmmm... must not be getting fuel. Swapped injectors with one of the good cylinders and was happy to see the issue moved with the injector.
I guess I'm going to shell out to have them all cleaned again. Even though I just did that less than 3000 miles ago. I say all because when I unplugged the injectors individually with the motor idling, each had varying effects on how it ran. So some of the others in addition to no. 2 may also be dirty? But what could have caused them to go bad all of a sudden? One day it was good, but then the next day when I go to take it to work it's crap. I have read that letting the fuel level get too low can dislodge crud in the tank. It had about 3 gallons in it last time it was running well and it has certainly ran on less fuel than that before. Should the filter be replaced? Is it worth taking the tank out and cleaning it? Lots of questions, but I am happy the immediate issue presented itself so quickly. I'm just trying to diagnose the root cause to avoid another $100 injector cleaning/test. |
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| stinkindiesel |
Jul 3 2017, 04:23 PM
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Member Group: Members Posts: 184 Joined: 14-June 13 From: Georgetown, TX Member No.: 16,012 Region Association: Southwest Region |
Keep in mind that measuring voltage on a circuit that uses a resistor to drop the voltage will measure the full voltage when open circuit, but will measure correctly under load. It's entirely possible you measured 12V on the injector wiring with the injector unplugged. Remember, no current flow, no voltage drop.
Gary |
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| troth |
Jul 4 2017, 10:08 PM
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#3
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Member Group: Members Posts: 160 Joined: 17-August 16 From: CT/WA Member No.: 20,305 Region Association: None |
QUOTE(stinkindiesel @ Jul 3 2017, 06:23 PM)  Keep in mind that measuring voltage on a circuit that uses a resistor to drop the voltage will measure the full voltage when open circuit, but will measure correctly under load. It's entirely possible you measured 12V on the injector wiring with the injector unplugged. Remember, no current flow, no voltage drop. Gary Ok, this makes me feel a little better. I'm fairly certain on that steady 12 V reading. The injectors all are within spec for the resistance (think it's 1.6 ohms iirc) so I don't think anythings fried. mepstein, I was using the MMO for awhile but haven't been the last maybe 2k miles. The POR15 is already on its way so I think I'm going to use it just to get my money's worth. Unless y'all know of any damage it can do? Here's some pics of the tank so you can judge for yourself. (IMG:http://www.914world.com/bbs2/uploads_offsite/i1120.photobucket.com-20305-1499227737.1.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i1120.photobucket.com-20305-1499227737.2.jpg) The "garage"... (IMG:http://www.914world.com/bbs2/uploads_offsite/i1120.photobucket.com-20305-1499227737.3.jpg) And one without the cover. (IMG:style_emoticons/default/biggrin.gif) (IMG:http://www.914world.com/bbs2/uploads_offsite/i1120.photobucket.com-20305-1499227738.4.jpg) PS can anybody tell me what this plug on the driver side of the rear trunk goes to? I presume it's for some optional component I don't have... (IMG:http://www.914world.com/bbs2/uploads_offsite/i1120.photobucket.com-20305-1499227738.5.jpg) |
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Posts in this topic
troth Fuel injector gone bad Jun 21 2017, 09:28 PM
porschetub A good clean filter is really important,your pump ... Jun 21 2017, 09:43 PM Chris914n6 I wouldn't base too many assumptions on one ta... Jun 22 2017, 02:39 AM Papermaker I've been using Chevron Fuel Injection cleaner... Jun 22 2017, 05:44 AM timothy_nd28 With the wires and connectors pushing 50 years on ... Jun 22 2017, 09:24 AM
troth
With the wires and connectors pushing 50 years on... Jun 22 2017, 02:58 PM Bartlett 914
With the wires and connectors pushing 50 years o... Jun 22 2017, 04:28 PM Jeff Bowlsby
No. The injectors get a pulsed signal<3V. 1... Jun 22 2017, 06:52 PM troth
No. The injectors get a pulsed signal<3V. ... Jul 3 2017, 02:13 PM mepstein
No. The injectors get a pulsed signal<3V. ... Jul 3 2017, 02:32 PM Bartlett 914
Vehicle was running great until I lost cylinder n... Jun 22 2017, 10:32 AM Jeff Bowlsby The power resistors to drop the voltage to the inj... Jul 3 2017, 03:03 PM BeatNavy
The POR15 is already on its way so I think I... Jul 5 2017, 09:35 AM Jeff Bowlsby D-Jet injectors should measure about 2.4 ohms.
Th... Jul 5 2017, 09:11 AM |
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