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Engine cant start when is cold.

Tiny
QNEV1
  • MEMBER
  • 1999 MERCEDES BENZ A160
  • 1.6L
  • 4 CYL
  • FWD
  • MANUAL
  • 65,000 MILES
I change many parts and the problem is still here.
I change : fuell pump, fuell filter, fuell injections - mass airflow sensors + trottle - sparkplugs + bubine.
I have 3, 7bar fuell pressure.
On diagnostic dont apears any wrongs
What I miss?
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Wednesday, October 1st, 2014 AT 12:35 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I'm not sure I understand everything. First, is the fuel pump pressure within the manufacturer's specs? Have you confirmed a good hot blue snapping spark at the plugs?

If all of that is good, check the coolant temp sensor. It may not be making the fuel mixture rich enough to start when the engine is cold.
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Wednesday, October 1st, 2014 AT 6:57 PM
Tiny
QNEV1
  • MEMBER
  • 2 POSTS
Yes it is, pressure must be from 3.5-4.2bar. This car is not like the others. Coolant temp sensor dont involved in ignition. Yes it is works ive change it. Diagnostic says coolant temp is ok 88.5c
The problem is other. The mass airflow sensor is with my ECU in 1 block in front. I have a normal airflow indicator 9, 3kg/h. And the intake air temperature is the right. (These sensors bought as new from ebay)
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Thursday, October 2nd, 2014 AT 1:49 PM

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