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  #29  
Old 04-01-2019
layback40's Avatar
layback40  layback40 is offline
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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.
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  #30  
Old 04-01-2019
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Quote:
Originally Posted by layback40 View Post
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.
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
  #31  
Old 04-01-2019
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This is my step by step elimination process based on the feedback from you (thank you) and research...
R
  #32  
Old 04-01-2019
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Quote:
Originally Posted by amlav View Post
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 .
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.
  #33  
Old 04-01-2019
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Quote:
Originally Posted by croitoru View Post
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
PCM is next to the engine on top of the wheel well.
ECM is between the firewall & the heater in the cabin.
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  #34  
Old 05-01-2019
croitoru  croitoru is offline
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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.
  #35  
Old 05-01-2019
croitoru  croitoru is offline
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Quote:
Originally Posted by croitoru View Post
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

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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