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Misfire problem

Tiny
6FOOT4PASSAT
  • MEMBER
  • 2003 VOLKSWAGEN PASSAT
  • 1.8L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 154,000 MILES
Hi, I am having a misfire on all four cylinders after the car idols for thirty seconds and rpm's drop down. I have changed the coil packs, spark plugs, camshaft position sensor, crankshaft position sensor, new turbo, fuel injection rail, the injectors, mass air flow sensor, EGR valve, air pump, air temperature sensor, clean throttle body, checked for a head gasket leak and it passed. Can anyone help me please? I have invested a lot of money in this vehicle and I cannot seem to find the problem.
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Tuesday, September 23rd, 2014 AT 6:56 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
Is it a random misfire in all cylinders or one specific cylinder? Also, has the check engine light come on? What codes are stored? Have you checked for vacuum leaks? Have you made sure the catalytic converter is no plugged?
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Tuesday, September 23rd, 2014 AT 7:32 PM
Tiny
6FOOT4PASSAT
  • MEMBER
  • 2 POSTS
Yes, it is a random misfire in all cylinders. The check engine light is on and it has ten codes. It has a new catalytic converter on it. I have check the engine for any vacuum leaks and I cannot find any.

#1 is random misfire.
#2 is cylinder #1 misfire.
#3 is cylinder #3 misfire.
#4 is cylinder #2 misfire.
#5 is cylinder #4 misfire.
#6 is random misfire.
#7 is cylinder #1 misfire.
#8 is cylinder #3 misfire.
#9 is cylinder #2 misfire.
#10 is cylinder #4 misfire.
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Tuesday, September 23rd, 2014 AT 7:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,724 POSTS
This can be caused by weak fuel pressure can you run a test to confirm. Here is a guide:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If it tests bad here is how to replace the fuel pump.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

You have a trap door so its not to bad to replace it.

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers
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Wednesday, September 24th, 2014 AT 5:20 AM
Tiny
KENDRARUSSELL
  • MEMBER
  • 1 POST
This post is so right. I had big trouble with my car same problem once I replaced the pump the car had no more problems.
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Wednesday, May 2nd, 2018 AT 12:10 PM

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