1998 Golf GTI Occasional crank, no start issue

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Mursu

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The car doesn't always start with the first try, or it might start but runs very badly for a couple of seconds and then it dies. Usually, it starts normally on the second try. The problem occurs only when the car has not been running for at least 8 hours. The weather also seems to have an effect as the problem is more likely to happen when it's freezing outside. Engine block heater doesn't prevent the problem from happening. Once the car starts, it runs generally fine. This is a stock 1.8T AGU.

Code:
Monday,29,August,2022,17:14:59:32055
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.3.1.4 (x64)  HEX-V2 CB: 0.4615.4
Data version: 20220407 DS337.0
www.Ross-Tech.com


Mileage: 269340km-167360mi   Repair Order:



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 1J - VW Golf/Bora IV (1998 > 2006)
Scan: 01 02 03 08 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57 75
          76
 
   Mileage: 269340km-167360miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-018-AGU.lbl
   Part No: 06A 906 018 R
   Component: 1.8L R4/5VT MOTR HS D03 
   Coding: 04000
   Shop #: WSC 00000 
   VCID: 313F1A33883E89F3701-4B3C

No fault code found.
Readiness: N/A

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1J0-907-37x-ABS.clb
   Part No: 1J0 907 379 E
   Component: ABS/EDS 20 IE CAN  0001 
   Coding: 13504
   Shop #: WSC 01317 
   VCID: 3333103B7222BBE302D-4B1E

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 3Bx-907-044.lbl
   Part No: 3B1 907 044 A
   Component: CLIMATRONIC     S 7.0   
   Coding: 01000
   Shop #: WSC 01317 
   VCID: 1F1BEC8BEEAA0F83D65-25B6

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 1J0-909-60x-VW3.lbl
   Part No: 1J0 909 609
   Component:  A AIRBAG VW3 SG   0002 
   Coding: 00065
   Shop #: WSC 51000 
   VCID: 6C81CB476F9C241B037-4B7A

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 1J0-919-xxx-17.lbl
   Part No: 1J0 919 880 B
   Component: A4-KOMBIINSTR. VDO V10   
   Coding: 04142
   Shop #: WSC 75337 
   VCID: 30391F37833480FB7FF-5184

   Subsystem 1 - Part No: IMMO
   Component: IDENTNR: VWZ7Z0V0247418         
   IMMO-IDENTNR: VWZ7Z0V0247418       

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 1J0-959-799.lbl
   Part No: 1J0 959 799 J
   Component: 03 Zentral-SG Komf.0001 
   Coding: 04097
   Shop #: WSC 01317 
   VCID: 45D75EE32CB63553BC9-4B3C

   Subsystem 1 - Part No: 1J1959801A
   Component: 03 Tõrsteuerger. FS0022 

   Subsystem 2 - Part No: 1J1959802B
   Component: 03 Tõrsteuerger. BF0022 

   Subsystem 3 - Part No: 1J4959811A
   Component: 03 Tõrsteuerger. HL0022 

   Subsystem 4 - Part No: 1J4959812A
   Component: 03 Tõrsteuerger. HR0022 

1 Fault Found:
00953 - Interior Light Time limit
            25-00 - Unknown Switch Condition

End----(Elapsed Time: 05:20, VBatt start/end: 14.4V/14.2V. VIgn 0.0V)------

There haven't been any engine DTCs for some time now. Half a year ago it had these:

16500 - P0116 - Engine coolant temp. sensor (G62) 35-10 - Implausible signal - Intermittent
00575 - Intake manifold pressure 08-10 - Control limit surpassed - Intermittent

Here's a list of things I have done. None of these had any effect on the problem:

- Coolant temp. sensor has been replaced with a genuine part and the P0116 has not returned.
- N75 valve has been replaced but I don't think that fixed the intake manifold pressure issue. The 00575 came when I very quickly floored the gas pedal at low RPM on second gear. It felt like driving through a small wall. Now I use the pedal more softly so that it won't happen again. Maybe the problem is in the turbo itself. There is some oil in the turbo inlet pipe, and the car eats about 1 l of oil for every 10000 km.
- Plugs have been changed.
- Air filter has been changed.
- Fuel filter has been changed.
- MAF sensor has been cleaned. The part might not be original but it's Bosch 0 986 280 201 which should be good I guess. I have measured 112.22 g/s at 6120 RPM which seems reasonable.
- Throttle body has been cleaned and adapted.
- Intake air temperature sensor has been cleaned.
- PCV hoses under the intake manifold have been changed. There was a small hole in the hose that goes to the manifold.
- Vacuum line from the intake manifold to brake booster has been changed. It had cracks at its connections but it didn't apparently leak.
- The brake booster has been replaced because it made a whistling sound and it didn't boost the brakes very well.
- Vacuum lines from the intake manifold to diverter valve and fuel pressure regulator have been replaced.
- Other possible vacuum leak locations at the intake manifold were tested with brake cleaner while the car was logging lambda reg. Doesn't seem like there are any leaks anymore.

I have been following the fuel trims at MVB 008. Idle learned (apparently, this is the additive fuel trim) is -1.6 % and Learned (multiplicative fuel trim) is 3.9 %. The values weren't really affected by the actions above.

Does anyone have any ideas on what could be causing the issue?
 
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JMR

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i have the same problem with my 2002 golf 4 1.6i but i've got used to it. I usually let it run for a minute while i fix my phone in the holder...and getting ready to drive. No change in winter or summertime. I've replace the mechanical fuel regulator with a used one to see if the problem was from there..and it was much much worse so i did put my old one back in. The damn regulator is nearly 150 euros...so.. since it doesn't bother me that much...
 
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Mursu

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That's interesting. The fuel pressure regulator could certainly be the cause of this. I haven't done much diagnosis on the fuel system yet. At least the pump runs when the ignition is turned on. I'll try to get a new regulator from somewhere and let's see if it changes anything.
 
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Mursu

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Ok, I replaced the pressure regulator some time ago but it didn't have any effect. The problem is still there. Luckily it was a cheap DIY job. I'm suspecting the fuel pump now so I started to prime the pump a few times before cranking. So far that seems to help and the car starts ok. I need to continue this some more time to be sure. I wonder if there is any other part that could be the cause, or is it certainly the pump this time?
 

EuroX

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Could be a bad crank sensor. Does the tach move when cranking when it doesnt fire?? If not crank sensor may be on the fritz.
 

JMR

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Ok, I replaced the pressure regulator some time ago but it didn't have any effect. The problem is still there. Luckily it was a cheap DIY job. I'm suspecting the fuel pump now so I started to prime the pump a few times before cranking. So far that seems to help and the car starts ok. I need to continue this some more time to be sure. I wonder if there is any other part that could be the cause, or is it certainly the pump this time?
Yes it could be , afterall that car has an age already and if the pump it s original..then..yeah..i d go that route. Use a Pierburg
 

Mursu

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Could be a bad crank sensor. Does the tach move when cranking when it doesnt fire?? If not crank sensor may be on the fritz.
It does move. When it has a bad start, the RPM is usually less than 600. Then it either dies or starts from there. It's weird how it can have a rough time first (barely turning at 400 RPM) and suddenly it just starts like nothing was wrong.
 

EuroX

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400 is normal cranking speed.
 

JMR

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I've changed my press regulator today, after about 5 hours i cranked the car and it started right up without hesitation and misfires. So far so good, i'll see how it is in the morning after more than 10-12 hours. But i have a feeling that it's been fixed.
Edit : confirmed , problem solved !
 
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