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  #19  
Old 01-09-2018
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amlav  amlav is offline
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Glad to hear that part of the issue was fixed . To try and sort out the fuel issues I would start with replacing the fuel filter .
Make sure there is no air getting in to it (seal has to be perfect).
Air also can get in the fuel system if injector(s) are faulty and don't close properly .
Fuel filter issues still would allow the engine to rev up in neutral but maybe not under load .
Clean the MAF sensor and replace the air filter .
Check number 1 injector by measuring the coil reading (should be arround 120 ohm) . If there is no reading than that could be the problem . Engine management computer will not let engine to rev up over 2000 rpm if doesn't get the signal from the needle sensor inbuilt in to injector 1 . Also check the electrical connections on it - including connectors too).
Some say that sensor can be baypased connecting a 100 ohm resistor in parallel on the 2 wires . (not sure about it , mine is still ok ).
If all above ok than only thing left would be injection pump (hope not).
Can you rev it up over 2000 rpm in neutral ???
  #20  
Old 02-09-2018
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Actually that's a very good point, and thank you for highlighting.
It's probably the relevant engineering differentiation I should research on.
Based on your hint, Amlay (thank you), I realised that the fuel underdelivery issue ONLY happens under LOAD. I don't know what it means yet, but It think it's a HUGE troubleshooting clue.
Revs fine (3000+ rpm) and have (some) black smoke in neutral, stationary.
So I guess perhaps the next step would be to understand what sensors come into computer calculations as input for load-based decisions, and go from there? I've checked #1 resistance before and seems fine, but the wiring looks like it might have been worked on before (possibly same troubleshooting?). Maf looks clean but I will recheck. Also, I bled the fuel pump before didn't make much difference. I also guess airfilter and maf would cause the same issue both under load and in neutral? Although you say that fuel pump/injector could cause this exact behaviour ( RPM fine at neutral but limiting under load).
R

Last edited by croitoru; 02-09-2018 at 11:17 AM.
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  #21  
Old 02-09-2018
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Have you replaced the fuel filter element yet? No point in any further trouble shooting until you have done that. When you replace the element it would be worth blowing back the fuel line with compressed air. Make sure you have the fuel filler cap off when you do it. This will clean any blockage out of the strainer in the tank.
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  #22  
Old 27-09-2018
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Sounds exactly what mine was doing a few years ago , turned out to be a faulty Map sensor in the inlet manifold... try cleaning if not replacing
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  #23  
Old 03-11-2018
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ok...life doesn't seem to give me a break... work was mad but most annoyingly, got the gearbox fixed for about 8 weeks then...
XJ 1998 VM - stopped going into 3rd - again - stripped fork. They replaced pressure plate, said take in again after 500 to 1000k for check.
Original problem- on original topic - got a Bosch scan from SCE Lawton today (no engine check light if course that picked up P1660 , which seems consistent with behaviour.
This guy seems yo have travelled yhe path...
http://jeep-club.co.uk/viewtopic.php?t=6623

Another bad news is that my ZJ is making rear end noises, lent it to my gf for a week got way worse...diff oil spilling out of rear...will have to take a look.

I hate when people post and ask for advice then once their issue is solved they never post back... so yeah, I'm slow on progress updates, but I WILL post back until the issue is solved.
  #24  
Old 03-11-2018
croitoru  croitoru is offline
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@laydback40 - I think you're right ... I've thrown away everything I know about petrol and trying to learn diesel...It would be fun if it wouldn't be so painful at the moment �� Thank you, it's the right mindset change...
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  #25  
Old 03-11-2018
croitoru  croitoru is offline
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Quote:
Originally Posted by anths View Post
Sounds exactly what mine was doing a few years ago , turned out to be a faulty Map sensor in the inlet manifold... try cleaning if not replacing
Can I ask how did you clean it please?
  #26  
Old 03-11-2018
croitoru  croitoru is offline
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ok... p1660 FM details are at odds with the link posted above...
http://zinref.ru/avtomobili/Jeep/100...NGLISH/623.htm
wonder if I should just get a complete pump? Anyone has a good second hand one?
Love the truck but it's driving me nuts instead of me driving it nicely...
  #27  
Old 03-01-2019
croitoru  croitoru is offline
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Spare MAF swapped. drove disconnected for test, drove like crap, so not that.
Fuel cuttoff valve changed - code didn't come back...so not that
Fuel and air filter changed - fuel filter bled - so not that.
Oil and oil filter changed - so not that
Injector #1 resistance is 117 Ohm, so probably not that.
Currently running diesel cleaner and acetone in tank.
Still throws back like a rubber band when going uphill and hitting ~2000 rpm - loss of power... don't have to downshift, seems to be self regulating, I can climb in 4th and 5th but at at steady ~2000 rpm and 60-80 kmph.... if it's to high will slow down then kick power back in and climb steady as long as it stays around 2000 rpm.
I'm running fast out of ideas and research. It obviously only happens on incline or under engine load - seems relatively fine on flat and definitely a rocket with the even slightest downhill...

Last edited by croitoru; 03-01-2019 at 05:27 PM.
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