Very rough crank over

Tiny
WORZELJWR
  • MEMBER
  • 1995 RENAULT CLIO
  • 1.2L
  • 4 CYL
  • 2WD
  • MANUAL
  • 73,000 MILES
My car has a very rough tick-over. Hot or cold. Normal driving has no misses or loss of power. The idle control valve has been replaced, but no difference. Car smells like running rich, has single port injection. Any ideas, please. MOT is soon! Thanks. Jim
Wednesday, September 8th, 2021 AT 10:23 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,068 POSTS
Hi,

First, this vehicle isn't offered in the US, so I have very little info on it. However, I will try my best to help.

Since it smells like it is running rich, the first thing I would check is fuel pressure. If it is high, that can be an issue.

Here is a link that explains how in general it is done:

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

In the link, it also explains how to check the fuel pressure regulator. Oftentimes, the regulator is controlled by an engine vacuum. If it has failed, it can draw raw fuel directly into the intake and cause the rich mixture as well.

Let me know what you find or if you have other questions.

Take care,

Joe
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Thursday, September 9th, 2021 AT 5:40 PM

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