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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old January 21st, 2019, 14:18   #16
Crusty
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Join Date: Feb 2018
Location: Idaho
TDI(s): 98 Jetta
Fuel Economy: Seems to be 46ish
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Ok,now that I look at the picture, I see it Most of what y see is actually oil. I changed the oil cooler sandwich o ring, thinking that was the leak, but I now think it is leaking where it mounts to the block.

Would a car that has worked perfectly suddenly go bad over night? To test, I should look at the line while cranking, correct?
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Old January 21st, 2019, 15:47   #17
Mongler98
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Join Date: Mar 2011
Location: Northern MD
Fuel Economy: Race: 12mpg, Gandma:65mpg
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Quote:
Originally Posted by Crusty View Post
Would a car that has worked perfectly suddenly go bad over night?
Are you kidding? YES.
spoiler: Its a VW
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Old January 21st, 2019, 17:51   #18
ToddA1
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Join Date: Aug 2011
Location: NJ 08002
Fuel Economy: Dismal
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Quote:
Originally Posted by Crusty View Post
Would a car that has worked perfectly suddenly go bad over night?

I had this happen, when I was trying to leave work. Ended up being the engine speed sensor (g28), aka crank position sensor, CPS. Itís easy to test.

http://forums.tdiclub.com/showthread.php?t=379094

Look at the tailpipe, when cranking. White smoke....? If so, fuel is moving.

-Todd
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Old January 21st, 2019, 21:16   #19
Mongler98
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I had a starter fail on my the day after i installed it. It jammed up and never retracted. Imagine a starter motor spinning at 4,000 RPM (or whatever that gear reduction is from the flywheel. Well, it literally welded the shaft of the starter in place and left my work van stranded. BRAND NEW remanPOS part. oem baby, you gata go oem on the parts that count!
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Old January 22nd, 2019, 09:24   #20
Crusty
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Join Date: Feb 2018
Location: Idaho
TDI(s): 98 Jetta
Fuel Economy: Seems to be 46ish
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Todd, your link has the same symptoms as what I am experiencing. I just ohm’d the Crank sensor and got 833 between whit and yellow and infinity for any other combination. What should the ohms be? I think this could be my problem

Edit: I just reread the ohms with it set to 20k instead of sound, and it read 1.109

Also, between black and white on the harness end, I get 0.10v with the key in the run position

Last edited by Crusty; January 22nd, 2019 at 09:37.
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Old January 22nd, 2019, 09:34   #21
ToddA1
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Quote:
Originally Posted by ToddA1
Pulled the speed sensor and it looked fine, other than a small crack in the insulation. Bentley states it should read between 1.0-1.5K ohms, between pins 1 and 2. Mine tested 100% open.

-Todd
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Old January 22nd, 2019, 14:11   #22
Crusty
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TDI(s): 98 Jetta
Fuel Economy: Seems to be 46ish
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I also tested for keyed voltage to the IP harness. It and the injector #3 both were 10.__ volts, so I think we are good for electrical. I just swapped fuel hoses, and am going to get a filter and bleed it all. All the lines are bone dry, and were when I pulled the hoses. It appears to have totally lost prime.
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Old February 1st, 2019, 20:56   #23
Crusty
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Join Date: Feb 2018
Location: Idaho
TDI(s): 98 Jetta
Fuel Economy: Seems to be 46ish
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I just got back to working on it today. I replaced the fuel lines and the filter, bled it and it fired up. I am not 100% sure what was wrong, but new fuel supply components seems to have fixed it. Thanks to everybody for helping me out. I appreciate it.
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Old February 2nd, 2019, 05:49   #24
ToddA1
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Was the filter empty? Glad you’re up and running.

-Todd
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Old February 2nd, 2019, 07:21   #25
iluvmydiesels
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Fuel Economy: mk3 ~43mpg
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you have to remember to change your filters. fuel filter if i remember is 20k(??)miles, or about 2 years. like it sounds like you did, you prime filter, its also good to prime,add fuel or additive to inlet line. it fills quick, so dont spill. doesnt have to be 'topped off'.
could have been an old filter you didnt change and clogged.(?).
or as todd mentions above it could have been empty.
while your at it get a new air filter and put it in. im not sure how long these std air filters are good for. (20k -??-, also?). air filters are very important to a diesel. fuel filters are similar.
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Old February 2nd, 2019, 21:44   #26
Crusty
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Join Date: Feb 2018
Location: Idaho
TDI(s): 98 Jetta
Fuel Economy: Seems to be 46ish
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I started by checking voltage at all the connections, and filling them with dielectric grease. Then I put in new hoses and fuel filter. I primed everything by slowly pouring fuel in until it wouldn’t take anymore, and then cranked it. The car fired right up,so I watched it for about 10 minutes. I still had some air in the lines, and even though it was running, I stopped and reprimed. This morning, there was still no air, and it fired right up. I have been driving it today. I do get some seeping from the electrical plug on the side of the pump,so I will need to replace it at some point, but for now, I am glad to have it running again!
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Old February 3rd, 2019, 06:39   #27
iluvmydiesels
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it takes at least a few minutes for all air to purge out of system. sitting there idling it may not purge. if its running ok, take out for a spin and see how it goes, and if lines purge.

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its also good to prime,add fuel or additive to inlet line. it fills quick, so dont spill
i was going to point out. if you put fuel in the inlet line to prime, Make Sure you filter this fuel first!! i take a bottle of additive and fill up a good ways, and connect.
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