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14-05-2018
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I just registered
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Join Date: Apr 2018
Location: Sweden
Posts: 13 What Jeep do I drive?: XJ
Likes: 2
Liked 5 Times in 3 Posts
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Yes. I gonna try that.
Sometimes I wonder if they measured it the wrong way (?)
Damn. Found some soot around the exhaust when I drove back from work yesterady ;(
BTW. 2/ Failed EGR. If you remove the AGR & are able to blow air through from the inlet (pipe) side it is failed. Simple fix is to put a blank plate ( piece of tin can) between it & the inlet manifold. The valve is NOT 100% air tight
Thanx anyway. Ill get back to you all later
__________________
Jeep Cherokee XJ VM TD 1998
260000 km -161 556.51 miles
Last edited by Irie; 14-05-2018 at 07:01 PM.
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15-05-2018
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I just registered
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Join Date: Apr 2018
Location: Sweden
Posts: 13 What Jeep do I drive?: XJ
Likes: 2
Liked 5 Times in 3 Posts
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Another thought...I bought one of these ODB readers that works pretty OK. I noticed that it (ODB reader and APP) does not read the coolant temperature accurate. It seems to be stuck at - 20 deg C. The gauge in the car seems to working fine tho. In the Haynes manual (petrol) there is, of course, a relationship between that sensor and the cars computer.
What if the computer thinks its still -20 deg when its like +20 as it is today. Well in cold weather the Jeep need more diesel.
I also noticed that the ODB kit gets information from the MAF sensor (It varies with RPM). We discussed the MAF earlier...
I founs this in the manual i just got - The actual time that the fuel is delivered is veryimportant to the diesel combustion process. The MSAmonitors outputs from the engine speed sensor (flywheelposition in degrees), and the fuel injector sensor (mechanical movement within the #1 cylinder fuel injector). Outputs from the Accelerator Pedal Position sensor, engine speed sensor (engine rpm) and engine coolant temperature sensor are also used. The MSA will then compare its set values to these outputs to electrically adjust the amount of fuel timing(amount of advance) within the injection pump.
Any thoughts on that my friends
__________________
Jeep Cherokee XJ VM TD 1998
260000 km -161 556.51 miles
Last edited by Irie; 15-05-2018 at 07:12 PM.
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15-05-2018
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Grumpy Old XJ Dsl Owner
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Join Date: Jan 2011
Location: Northern Victoria
Posts: 13,781 What Jeep do I drive?: XJ
Likes: 4,579
Liked 6,550 Times in 4,342 Posts
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Quote:
Originally Posted by Irie
Another thought...I bought one of these ODB readers that works pretty OK. I noticed that it (ODB reader and APP) does not read the coolant temperature accurate. It seems to be stuck at - 20 deg C. The gauge in the car seems to working fine tho. In the Haynes manual (petrol) there is, of course, a relationship between that sensor and the cars computer.
What if the computer thinks its still -20 deg when its like +20 as it is today. Well in cold weather the Jeep need more diesel.
I also noticed that the ODB kit gets information from the MAF sensor (It varies with RPM). We discussed the MAF earlier...
I founs this in the manual i just got - The actual time that the fuel is delivered is veryimportant to the diesel combustion process. The MSAmonitors outputs from the engine speed sensor (flywheelposition in degrees), and the fuel injector sensor (mechanical movement within the #1 cylinder fuel injector). Outputs from the Accelerator Pedal Position sensor, engine speed sensor (engine rpm) and engine coolant temperature sensor are also used. The MSA will then compare its set values to these outputs to electrically adjust the amount of fuel timing(amount of advance) within the injection pump.
Any thoughts on that my friends
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OBD is useless, the system needs DBR 11 or 111, too expensive to buy. As its a old diesel you will see soot on the inside of exhaust. I think you are over ding your interpretation of everything.
__________________
98&01XJVMs,06&07KJCRD's,No longer question authority,I annoy it.More effect,less effort.10000Club
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15-05-2018
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I just registered
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Join Date: Apr 2018
Location: Sweden
Posts: 13 What Jeep do I drive?: XJ
Likes: 2
Liked 5 Times in 3 Posts
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Haha ok sir. Im overdoing almost everything in real life also. Well thats how you learn stuff.
__________________
Jeep Cherokee XJ VM TD 1998
260000 km -161 556.51 miles
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16-05-2018
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CrawlerStar
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Join Date: Apr 2010
Location: Melbourne Australia
Posts: 402 What Jeep do I drive?: XJ
Likes: 88
Liked 111 Times in 90 Posts
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OBD reader on my diesel doesn't do anything . I could still get some basic info from the ECU by sending string commands trough the laptop to the reader and got back as far as I remeber voltage only .
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25-05-2018
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I just registered
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Join Date: Apr 2018
Location: Sweden
Posts: 13 What Jeep do I drive?: XJ
Likes: 2
Liked 5 Times in 3 Posts
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Ok. Found some new issues with my JEEP
1. Looked into some more about the coolant sensor. It is actually pretty important. So I took it off and found that it is a aftermarket one, with 3-pins instead of 2 (eeeh). I did some test on it and it seems to be broken. The cables seems to be ok (continuoty test).
[IMG] [/IMG]
2. Good or bad injectors ?? They all sound alike.... Maybe they still are gunked up (??) I have to check them all I guess when I get the tools BUT when I was looking at the No 4 injector I found this... But, but... t he fuel drain tube is not here. Someone put a plug in it. Why do you want to do that?? Is this some kind of "MacGyver" fix when the injector or the pump is bad??
How do I fix AND where is the "tee banjo fitting" - This fuel
drains into the fuel drain tubes (Fig. 7) and back to
the tee banjo fitting, which is connected to the same
line as the overflow valve, which allows a variable
quantity to return to the fuel tank.
[IMG] [/IMG]
The saga continues...
__________________
Jeep Cherokee XJ VM TD 1998
260000 km -161 556.51 miles
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25-05-2018
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Grumpy Old XJ Dsl Owner
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Join Date: Jan 2011
Location: Northern Victoria
Posts: 13,781 What Jeep do I drive?: XJ
Likes: 4,579
Liked 6,550 Times in 4,342 Posts
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Quote:
Originally Posted by Irie
Ok. Found some new issues with my JEEP
1. Looked into some more about the coolant sensor. It is actually pretty important. So I took it off and found that it is a aftermarket one, with 3-pins instead of 2 (eeeh). I did some test on it and it seems to be broken. The cables seems to be ok (continuoty test).
[IMG] [/IMG]
2. Good or bad injectors ?? They all sound alike.... Maybe they still are gunked up (??) I have to check them all I guess when I get the tools BUT when I was looking at the No 4 injector I found this... But, but... t he fuel drain tube is not here. Someone put a plug in it. Why do you want to do that?? Is this some kind of "MacGyver" fix when the injector or the pump is bad??
How do I fix AND where is the "tee banjo fitting" - This fuel
drains into the fuel drain tubes (Fig. 7) and back to
the tee banjo fitting, which is connected to the same
line as the overflow valve, which allows a variable
quantity to return to the fuel tank.
[IMG] [/IMG]
The saga continues...
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The temp sensor is a simple thermistor type. The later ones have 2. One in each of head 2 &3. Both of mine have failed & I have replaced the thermistors ~ had to open up the sensor to get at it, replaced the thermistor, a couple of $ at an electronic parts shop, & glued them back together with epoxy resin. If the 3 pronged one has 2 of the prongs showing the right resistance you can use it. If the temp gauge was working, the sensor was fine. Stop trying to fix what isnt broken.
That plug on the #4 injector return line is standard Bosch equipment. The return is via #1 where there is a hose back to the return valve on the back of the IP. This is the same on most Bosch systems including Mercedes Benz diesels of that type.
If you pull the injectors out, how will you tell if they are faulty? You cant by looking at them. Do not try & dismantle them once you have them out or they will become faulty.
You can get them tested by a diesel injector specialist.
Just remember the engine is not euro 5 or 6 when it comes to emissions. One expects some smoke.
Best you stop playing around with things you dont understand. Just get it tested without #1 injector sensor connected & then start your playing if you must. If you keep going down your current path you will end up with a shed full of bits & a jeep that wont go. Your approach sounds like a teenager with a toy that he is trying to work out how it works.
__________________
98&01XJVMs,06&07KJCRD's,No longer question authority,I annoy it.More effect,less effort.10000Club
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