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04-01-2019
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Grumpy Old XJ Dsl Owner
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Join Date: Jan 2011
Location: Northern Victoria
Posts: 13,815 What Jeep do I drive?: XJ
Likes: 4,598
Liked 6,568 Times in 4,350 Posts
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There appears to be a fuel supply flow issue. If it was me, the first thing I would do, is with the tank under 1/4, take the filler cap off, disconnect the fuel supply hose from the filter & back pressure the line with compressed air, say 100 psi blast, this will blow any stuff restricting the pipe back into the tank.
__________________
98&01XJVMs,06&07KJCRD's,No longer question authority,I annoy it.More effect,less effort.10000Club
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04-01-2019
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Newbie
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Join Date: Sep 2007
Posts: 47 What Jeep do I drive?: ZJ
Likes: 0
Liked 6 Times in 5 Posts
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Quote:
Originally Posted by layback40
There appears to be a fuel supply flow issue. If it was me, the first thing I would do, is with the tank under 1/4, take the filler cap off, disconnect the fuel supply hose from the filter & back pressure the line with compressed air, say 100 psi blast, this will blow any stuff restricting the pipe back into the tank.
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Thank you, I'll do exactly that.
I've taken apart the pedal sensor as well today, looks ok, cleaned with electric contact cleaner, put some graphite on it, and some dielectric grease on...no change.
R
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04-01-2019
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Newbie
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Join Date: Sep 2007
Posts: 47 What Jeep do I drive?: ZJ
Likes: 0
Liked 6 Times in 5 Posts
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This is my step by step elimination process based on the feedback from you (thank you) and research...
R
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04-01-2019
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Newbie
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Join Date: Sep 2007
Posts: 47 What Jeep do I drive?: ZJ
Likes: 0
Liked 6 Times in 5 Posts
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Quote:
Originally Posted by amlav
I've just replaced my injector no 1 and next I want to measure the signal level coming from the needle sensor coil with an oscilloscope (just so I know ).
There is a chance that your signal from the needle sensor doesn't gets to the PCM (wiring broken in the loom maybe or loose contact ).
Before replacing pump have a good look and see how you go .
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Good point, thank you - voltage and signal not same thing...
Not sure where I'll get to borrow an oscilloscope, and I'll have to check pins to the controller modules (looks like there's a pcm jeep and an ecm bosch! working together...or not quite.)
Thank you,
R
Last edited by croitoru; 04-01-2019 at 06:47 PM.
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04-01-2019
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Grumpy Old XJ Dsl Owner
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Join Date: Jan 2011
Location: Northern Victoria
Posts: 13,815 What Jeep do I drive?: XJ
Likes: 4,598
Liked 6,568 Times in 4,350 Posts
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Quote:
Originally Posted by croitoru
Good point, thank you - voltage and signal not same thing...
Not sure where I'll get to borrow an oscilloscope, and I'll have to check pins to the controller modules (looks like there's a pcm jeep and an ecm bosch! working together...or not quite.)
Thank you,
R
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PCM is next to the engine on top of the wheel well.
ECM is between the firewall & the heater in the cabin.
__________________
98&01XJVMs,06&07KJCRD's,No longer question authority,I annoy it.More effect,less effort.10000Club
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05-01-2019
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Newbie
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Join Date: Sep 2007
Posts: 47 What Jeep do I drive?: ZJ
Likes: 0
Liked 6 Times in 5 Posts
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Blew the fuel line backwards, tank was bubbling for good 5 min...no change...
Last edited by croitoru; 05-01-2019 at 07:49 AM.
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05-01-2019
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Newbie
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Join Date: Sep 2007
Posts: 47 What Jeep do I drive?: ZJ
Likes: 0
Liked 6 Times in 5 Posts
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Quote:
Originally Posted by croitoru
Good point, thank you - voltage and signal not same thing...
Not sure where I'll get to borrow an oscilloscope, and I'll have to check pins to the controller modules (looks like there's a pcm jeep and an ecm bosch! working together...or not quite.)
Thank you,
R
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Ok...
So not having access to an oscilloscope, me thought let's disconnect no 1 and go for a drive...
No change in behaviour with the power loss!
So I guess now it's narrowed to the signal from no 1, either in the loom from connector to pcm, or injector itself (although it measures 117 as mentioned before).
I'll pull out the manual and see how I can test the connector to ECM segment... there.must be some expected voltage at #1 circuit...
R
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