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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 March 8th, 2018, 07:14   #1
jhax
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Default Fuel cuts out while going up hill

Good Morning Everyone,

I am curious to know why my 96 B4V is doing the following...

I am driving on flat ground at 65mph (cruise on or cruise off). I push the accelerator down and the car speeds up, just like any car should. I get to a long hill, there is a nice one along the I-70 corridor where the front range meets the mountains, still going 65 with cruise on.

Once the car starts climbing the hill, the RPM will hit about 2500 and then drop. The car will slow down to about 60mph (roughly 2250 RPM) and sometimes it hangs out there, sometimes it accelerates again to about 2500 RPM and cuts out again.

I can put the go pedal to the floor and the behavior remains the same. This only happens when going up hill. Other than that the car behaves fine.

Thank You,
Justin
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Old March 8th, 2018, 07:58   #2
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I would suspect a fuel starvation issue, if the low power goes away on its own. If it requires you to cycle the key, it may be limp mode due to a boost problem.

Have you changed the fuel filter lately? Are there bubbles in the clear line going to the injection pump? What is the fuel level when this occurs? have you tried to replicate the problem with a completely full tank?
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Old March 8th, 2018, 08:15   #3
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I changed the fuel filter 20k miles ago. No more air bubbles than normal. Full tank, half tank. Once I get to the top of the hill and flattens out everything acts normal. I have never had to cycle the key. Just get to the top of the hill. Would limp mode caused by the turbo go away by its self?
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Old March 8th, 2018, 08:25   #4
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No, it would require (at very least) a cycling of the key - off->on. It would also set a code which could be read with VCDS (but not a generic OBDII scanner).

How long after you're going up hill does the power drop?

Can you replicate the power drop on a long gradual acceleration?

I wonder if the pickup in the tank is plugging?

What is a "normal" amount of air bubbles for you? there shouldn't be very many at all.

Trying to understand if this is starvation, if it's an airleak into the line, or a restriction somewhere.

Do you have VCDS or access to it to scan for codes?
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Old March 8th, 2018, 09:12   #5
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20K is the fuel filter change interval. I'd replace it and see if it solves the problem. You may have gotten some bad fuel that clogged the filter partially.
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Old March 8th, 2018, 11:55   #6
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Windex,
I don't find key cycling is necessary. I have never had any codes (I do have a VCDS). I could capture a run on VCDS. Which measuring blocks should I log? As for the amount of time it takes for the RPM to drop, it's a gradual drop down to about 2350 rpm (~60MPH), maybe 3 or 4 seconds from end to end then it starts to gradually accelerate again back up to 65MPH. I have not been able to replicate it on flat ground, although I've tried. Normal being a very small amount that usually occurs. This has been going on since I bought the car. It came with the original fuel hoses and it happened then too. Once there was a split in the hose I replaced them with tygon and the same thing happened.

Peter, this happened post fuel filter change two oil changes ago which leads me to believe that the filter is/was good prior to this thing happening.
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Old March 8th, 2018, 12:10   #7
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Interesting - any other symptoms when it happens? Any black smoke?

If not, just a loss of power, I would log boost requested vs actual when the issue is occurring - if the boost actual hits requested, then you almost certainly have a fuel issue - either a restricted supply or a problem with the pump.
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Old March 8th, 2018, 12:18   #8
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No other symptoms. Would you happen to know what block that is in VCDS?

Good advice! Thanks!
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Old March 8th, 2018, 13:09   #9
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Measuring block 11 if I recall - just look for MAP absolute / requested, and MAP measured - they should follow each other pretty closely, especially if you use the graphing function
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Old March 8th, 2018, 13:56   #10
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Will do. I'll post results when I obtain them.
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Old March 8th, 2018, 21:13   #11
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If it's fuel starvation I'm thinking the IQ would increase trying to maintain power???

Log that too while you're at it.
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Old March 9th, 2018, 09:43   #12
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Okay will do. Thank you.
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Old April 9th, 2018, 19:40   #13
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Alright folks here is the MAP log I captured. If I am correct, I started it in a 5th gear pull to as high as the tach would register. I stopped the log and captured again starting from cruise control set at 65mph heading up a hill. I am pretty confident I captured the fuel cut out toward the end of the graph.




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Old April 10th, 2018, 10:57   #14
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I had to recently change my fuel filter due to starvation going up hill (I'm in Denver), and it had only been about 5k miles. Bottom line, we get bad fuel, change filters just like diapers.
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Old April 10th, 2018, 20:01   #15
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The only time I have had this scenario happen to me was with a bad fuel filter. Once I replaced it, all was good.
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