F9Q Gradual loss of power and smoking

This is the Forum for all your Renault Technical Questions, Problems or Advice.

Moderator: RichardW

Post Reply
Dirty Diesel
Posts: 1
Joined: 14 Apr 2019, 19:20
Location: England
My Cars: 2004 Volvo V40 Sport 1.9D 115 F9QT

F9Q Gradual loss of power and smoking

Post by Dirty Diesel »

Good evening.

I am posting this here, as someone who is familiar with the F9Q engines is likely to be here. I own a 2004 Volvo V40 1.9D with an F9Q engine, but I've got a problem.

The matter at hand, is this: my V40 has slowly been losing power, not gutless, but noticeable, and is smoking what seems to be black smoke, with possibly a hint of blue from what I can tell.

Over the course of my ownership, I have replaced/repaired the following:

Cleaned EGR valve

Replaced MAF sensor

Replaced N75 Valve (Vacuum Control Solenoid)

Replaced Turbocharger

I've checked over the vacuum system, and all seems to be in order. Along with losing power, it doesn't seem to idle right either, it jumps around, usually dropping by up to 50RPM, it doesn't sound much, but I know somethings wrong, as it always idles spot on.

I've spoken with the user on the Volvo forum (on which this is also posted) about the matter, and all we could come up with was the injectors. Two of the injectors do seem to "click" more than the other two, when holding a screwdriver to either the top, or the metal base of, the injector, then listening to them through the screwdriver.

I must also mention that I do not have ready access to a diagnostic machine, but have used one recently, and no engine related codes were available, indicating nothing completely gone yet, or any electrical problems. Engine Management Light is also NOT present.

Could anyone shed any light on the matter? It's getting rather annoying, and I'm starting the wonder whether it'll pass it's MOT tomorrow.

Any help is greatly appreciated! Thanks I'm advance
Peter.N.
Moderating Team
Posts: 11563
Joined: 02 Apr 2005, 16:11
Location: Charmouth,Dorset
My Cars: Currently:

C5 X7 VTR + Satnav Hdi estate Silver
C5 X7 VTR + Hdi Estate 2008 Red

In the past: 3, CX td Safaris and about 7, XM td estates. Lovely cars.
x 1199

Re: F9Q Gradual loss of power and smoking

Post by Peter.N. »

I'm afraid I have no experience with this engine but I have had similar faults with the Hdi 12 valve 2.0. engine which was due to a faulty pressure regulator on the back of the HP pump, they contain an almost impossible to clean filter but I replaced one with a second hand one from ebay for very little money and it cured the problems.

What I had was 'hunting' on tickover and lack of power at high revs, no smoke that I recall though. The problem could be injectors although I have never had a problem with mine but these are early common rail engines which seem to be somewhat simpler.

A diesel injection specialist would probably be the best person to go to as they usually know what they are doing.

Peter
Post Reply