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Old 07-21-11, 09:19 AM   #1
phantomcow2
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Jetta doesn't start after visiting gas station.

I'm trying to figure out why a '99 Jetta wouldn't start after it's visited a gas station and had its tank filled. This happens every time it fills up, and at random intervals after that. What happens is I'll try to start it, and it'll crank but but not start. If I depress the gas pedal it tends to help, but the engine dies if I let my foot off the gas. I have to hold the gas pedal to keep the engine operating at the lowest speed that isn't obnoxiously loud. If I hold it long enough I can let my foot off the gas and the car runs well.

I haven't really worked on VW's, is there something I should be looking for here? It seems like a normal tune up isn't in order because usually the car starts right up. Being able to press the gas pedal makes me wonder if this is an airflow issue, but I'm unsure of which parts control that on this car.
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Old 07-21-11, 10:01 AM   #2
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Maybe clean/replace the air intake if that hasn't been done lately. Dirty fuel injectors or fuel filter?
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Old 07-21-11, 10:18 AM   #3
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Maybe clean/replace the air intake if that hasn't been done lately. Dirty fuel injectors or fuel filter?
+1

I'll asume it fuel injected as opposed to carburated? (Rube made up a new word here...lol)

I had a 1994 honda that was kinda slow @ rest and would shutdown occasionally. I fixed it by cranking up the accelerator cable at the carburetor. Maybe it's expressed differently on real mechanical terms but in techie, that what I did.
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Old 07-21-11, 10:43 AM   #4
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Man, it is clearly time to give that Jetta away to someone who will rice it out.
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Old 07-21-11, 10:51 AM   #5
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There is also a module(having brain fart,can' remember the name) upstream of the air filter just after the start of the air intake that maybe part of the problem, measures the air flow.
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Old 07-21-11, 11:18 AM   #6
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I kind of remember this being brought up on Car Talk one day. The answer involved they all do that, as well as the fix. Not that I can remember what they did to fix it.
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Old 07-21-11, 11:46 AM   #7
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There is also a module(having brain fart,can' remember the name) upstream of the air filter just after the start of the air intake that maybe part of the problem, measures the air flow.
mass air flow sensor
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Old 07-21-11, 12:57 PM   #8
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I thought we already covered the girlfriends car issue months ago?Share the "beater Honda"till your first Christmas bonus comes through.

I suggested previously (now that you're employed) to find a girlfriend with a better car and taste in boyfriends.
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Old 07-21-11, 01:55 PM   #9
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You know, maybe Ruben can fix this. Send the Jetta to him and borrow his Hyundai for a while.
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Old 07-21-11, 01:56 PM   #10
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I kind of remember this being brought up on Car Talk one day. The answer involved they all do that, as well as the fix. Not that I can remember what they did to fix it.
Yes, I heard that episode, too. I thought the original post sounded oddly familiar. I agree that they said "they all do that" and I don't remember the fix, either.

Search the Googles and see what you find!

Last post: http://forums.vwvortex.com/showthrea...get-gas.-Help-!

Halfway down: Evap purge valve stuck: http://community.cartalk.com/discuss...getting-gas/p1

Yet another vote for the purge valve: http://jettajunkie.com/vw-jetta/show...putting-gas-in

And again: http://community.cartalk.com/discuss...getting-gas/p1

You get the idea.
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Old 07-21-11, 02:20 PM   #11
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My checklist: First, have the fuel pressure checked. Hard starts that are unpredictable are a sure sign of a bad fuel pump. If you have low fuel pressure, the possible causes are bad pump, bad pump relay, bad fuel filter, or any combination of the three.

If you have good fuel pressure as a constant, then it's very likely the mass air sensor or the fuel flow/pressure sensor, or both. If it's either of those sensors, though, you will be getting codes and the check engine light will be on.
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Old 07-21-11, 02:35 PM   #12
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Could be the Idle Air Control failing, the IAC takes the place of the old idle screw on a carb, it essentially is the air bleed past the throttle blade.
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Old 07-21-11, 02:45 PM   #13
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Yes, I heard that episode, too. I thought the original post sounded oddly familiar. I agree that they said "they all do that" and I don't remember the fix, either.

Search the Googles and see what you find!

Last post: http://forums.vwvortex.com/showthrea...get-gas.-Help-!

Halfway down: Evap purge valve stuck: http://community.cartalk.com/discuss...getting-gas/p1

Yet another vote for the purge valve: http://jettajunkie.com/vw-jetta/show...putting-gas-in

And again: http://community.cartalk.com/discuss...getting-gas/p1

You get the idea.
I've seen those. I opted to make a new thread because the symptoms don't exactly match the ones I've described.

The IACV would have been my first guess if I were fixing my Honda.

The fuel pressure is a great idea -- I should have thought of this! The car never hesitates, bogs, or in any way performs poorly once it's started and actually driving; my experience is that fuel pumps usually cause poor driving performance all together.

The check engine was on, and my hope was that the light may be related to the problem (bad sensor), but I got it scanned at Autozone and they were all old codes. Cleared the codes and the light isn't on. I told the guy at Autozone about the car's problem and he said "it's normal." Right.


I'm not too familiar with OBDII. If there is low fuel pressure, will the CEL throw a code that indicates this?
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Old 07-21-11, 02:49 PM   #14
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What Tom said, but DO NOT use the RubenX (TM) Method of unplugin' the fuel hose to see if gasoline comes out....just saying.
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Old 07-21-11, 03:09 PM   #15
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Does the car make wakka wakka puff puff sounds?
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Old 07-21-11, 04:32 PM   #16
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If it's the fuel pump and you change it out, change the fuel filter at the same time.One reason pumps fail is that they're working to hard to pump fuel through an old clogged filter. Besides the filter is reasonably cheap to change much less than another fuel pump.

Thanks, Black_box, that is the name I couldn't recall.
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Old 07-21-11, 04:38 PM   #17
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Long shot here, if it happens mostly (or only) when the car is cold it could be the gasket between the carb and the air filter is perished. I had that problem on an old Honda and it took three trips to the dealer for them to fail to fix it (it happened right after they allegedly serviced it, so I wasn't happy) and in the end a friend who knew a bit about engines took a look and fixed it within 5 minutes.
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Old 07-21-11, 06:04 PM   #18
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have you by chance checked out the owner's club forums for jettas?
they usually have a list of problems and fixes for the various models.


I know my 2000 nissan maxima has a mass air flow sensor problem that I only get when it's cold. Basically I know the MAF sensor is clogged with carbon and it's a common problem for that year's model.
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Old 07-21-11, 08:07 PM   #19
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Take off the gas cap. Does it start now?

Perhaps the tank isn't vented well and when you fill up there is to little air to allow the gas to be drawn into the pump.

After a few miles there would be enough air to allow said suction.
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Old 07-21-11, 08:30 PM   #20
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Take off the gas cap. Jam a lit flare in there.
This
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Old 07-22-11, 10:50 AM   #21
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This
Not even Ruben would do that, and he's on a first name basis with the Fire Department.
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Old 07-22-11, 10:51 AM   #22
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Not even Ruben would do that, and he's on a first name basis with the Fire Department.
your username precludes you from answering questions about all cars other than the Flintstonemobile. just sayin'
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Old 07-22-11, 11:35 AM   #23
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+1

I'll asume it fuel injected as opposed to carburated? (Rube made up a new word here...lol)

I had a 1994 honda that was kinda slow @ rest and would shutdown occasionally. I fixed it by cranking up the accelerator cable at the carburetor. Maybe it's expressed differently on real mechanical terms but in techie, that what I did.
Uhhh Ruben? Ummm no. We don't need no more wacka wacka puff puff choke pop dies oh crap call the fire dept please.

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Man, it is clearly time to give that Jetta away to someone who will rice it out.
Can't rice out a German.
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Old 07-22-11, 11:41 AM   #24
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Can't rice out a German.
Yeah, tell taht to the guy in Lewisville Texas rocking a Jetta that is lowered, blacked out and covered in Japanese lettering, decals, stickers, etc. I think the theme of the car was "People who America beat in WWII." Seriously.
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 07-22-11, 12:04 PM   #25
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Can't rice out a German.
Whatever the term is for the pimped-out Jettas running about the streets. You know what I mean.
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