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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old February 26th, 2018, 18:59   #1
sawbilly
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Default Another no start tdi question

Hey folks picked up a 280,000 non running 2004 jetta tdi. Had been sitting for a while, water leaked into passenger floorboard, mice had chewed several wires, rear lights,gas filler opener, headlight, maf sensor. Would not start battery had to be charged up. Glow plug light not operating replaced relay 109 she fired right up and ran great. Started fine for a few days then noticed a limp mode a few times but always cleared up after restart. Pulled it in the driveway to work on wires next day came out battery discharged, charged it back up and it hasnt started since then. Put a new battery in, replaced cps per vagcom code 16705/p.o 321. Tach seems to work but continues to throw code. Seem to be getting fuel after replacing fuel filter at fuel line. All fuses are good, cleaned all grounds under battery, asv is opening. Any help would be appreciated. New to tdi and new to forum. I did try to start car with charger hooked on a 20 amp charger.
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Old February 26th, 2018, 19:14   #2
Carlos_TJ
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Can you post a VCDS scan of your car?
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Old February 26th, 2018, 20:02   #3
whitedog
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Is this a crank, no start or no crank, (or slow crank) no start? Troubleshooting for the two are very different so we need to understand which it is. Before consulting our crystal balls.
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Old February 26th, 2018, 20:06   #4
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Idunno much about PD motors but I know BIG paragraphs are hard to read.
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Old February 26th, 2018, 21:53   #5
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Yeah, I'm with you on this one. It's enough to consume brain cells on the problem, but to also have to kill a bunch just to parse paragraphs...
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Old February 26th, 2018, 22:34   #6
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It's not even just the lack of paragraphing. The sentences randomly follow (or not) the rules of grammar.
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Old February 27th, 2018, 06:52   #7
sawbilly
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Whitedog this is a crank no start. Throwing just the one code 16705 po321. Replaced the cps and tach shows rpm. The code shows the same 16705. Thanks for your help.

To you other English scholards ever read Faulkner! I guess not.
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Old February 27th, 2018, 06:54   #8
Carlos_TJ
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Perhaps the wiring for the cps should be inspected?
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Old February 27th, 2018, 07:16   #9
sawbilly
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Yeah thanks Carlos. I checked voltage at the sensor seemed to be correct. How do i get the vcds scan? I'll check wiring back to ecm. Thanks for your help.
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Old February 27th, 2018, 07:31   #10
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HOW ON EARTH does William Faulkner have anything to do with your bad grammar and run on sentences? Obviously you should go back and read some more and "get good"!
And its "English scholars" btw

Now on to your issue, sounds like the battery may have killed something when it ran dead, or you might have shorted something out when changing it. Check your 109 relay for kicks! There is a great thread somewhere in the stickies for "Car won’t start". You should start there. Check injectors for fuel, if non sprays out of the cracked open line, trace it back to fuel filter and lines and 109 relay, shut off solenoid etc.... Check if you’re getting air- you probably are ASV is open as you say, so this leaves you with either timing or some ECU/controller issue, possible vac/boost line issue, wire harness improperly attached, I mean there is a TON of reasons why it won’t start but crank.

Maybe you should do a search for the codes you posted instead of telling us that we need to read more!
http://forums.tdiclub.com/showthread.php?t=328868
Look at this thread, maybe this can help!
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Old February 27th, 2018, 15:36   #11
Carlos_TJ
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A vcds scan is done using vcds. It will show all stored codes for the car. This include obdii codes and propietary vw.

As for the wiring check, the bes approach would be to monitor the cps signal using an oscilloscope while cranking at the sensor side and agaim at the ecu side.

If there are chaffed wires that have intermitent conection once the engine starts vibrating because of the starter will be almost imposible to catch with just continuity when the engine is at rest imho...
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Old February 27th, 2018, 19:46   #12
sawbilly
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Thanks Carlos. I'll give that a try. Think it may be an ecu problem. May have fried something with the charger. What should the cranking rpm register? Mine is real weak like 250 rpm. Sometimes it takes a few cranks for it to register. I used a Napa cps.

Oh and for the erudite. Scholards is a play on words.
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Old February 27th, 2018, 20:51   #13
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Quote:
Originally Posted by sawbilly View Post
Scholards is a play on words.
I caught that.

So the first thing is to burn that ChiNAPA CPS and put in a good one, even if it's from a running car.

It's hard to tell via the innerwebs (that's a play on words in case anyone is wondering) if the engine is cranking fast enough, but I and others have noted that their TDI will start when the cranking RPMs are very slow, regardless of what "the math" and "theory" say about minimum cranking speeds.

Did you make the time to look over the no start thread in TDI 101?
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Old February 27th, 2018, 21:03   #14
sawbilly
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Yeah thanks I did read that thread. Im going to buy a VW cps first and see if that helps. I believe the Napa was made in Italy. Seemed to be a fairly close mark on the oem. Any suggestions on what cps to buy?
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Old February 27th, 2018, 21:07   #15
whitedog
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Electronics bits are sometimes tough to choose. If it's from China, I assume it's junque (that's a play with spelling) but there are oftentimes reboxed parts that have the OEM logo ground off. You could try one of the fine vendors on this site. Being on the East coast, there are a couple out there that can get you parts in a day or two at very reasonable prices.
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