Late starting after piston change

2011 VOLKSWAGEN POLO
70,000 MILES • 1.2L • 3 CYL • TURBO • 2WD • AUTOMATIC
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SINGHADARSHH
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  • 3 POSTS
I have done a piston replacement job and it is starting very late after ten to fifteen cranks. After start engine is shaking a little bit.

Please help me.
Oct 29, 2017 at 5:42 PM
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KHLOW2008
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  • 41,814 POSTS
Has the timing been installed correctly?
Have you tested the engine compression?
Is the MIL indicating and have you checked for trouble codes?
Were spark plugs checked/replaced?
Oct 30, 2017 at 1:19 PM
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SINGHADARSHH
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Yes, timing checked it properly installed. Engine compression is good in all 3 cylinders.

It is showing an error code with crank seep sensor. I have replaced 2 times but still same code and delayed start.
Oct 31, 2017 at 9:25 PM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,814 POSTS
If it is a crank sensor fault code, possible causes are
1. The timing is not correct.
2. Sensor is bad.
3. Sensor wiring has a break somewhere or the connection is bad. Check for a poor ground too.
4. Crank sensor rotor is damaged or gap between sensor and rotor out of specs.
5. The Engine Control unit wiring is not connected well or is faulty

Oct 31, 2017 at 11:48 PM
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SINGHADARSHH
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Thank you. I will check all this and let you know
Nov 1, 2017 at 9:14 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,112 POSTS
Please let us know what you find. I'm interested to see what it is.

Cheers, Ken
Nov 2, 2017 at 11:46 AM
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