2003 Renault Trafic 1.9DCI - Low power, no boost below 2500rpm. Fixed. Watch part 2 for final cure.

Swapping Boost Pressure Control Valve. Cleaning EGR.
Vivaro Primastar.
Great improvement but Please watch my second video for even more improvement and a fix for the bottom end flat spot

[kitcarbuild]

The symptoms suggested a problem with the boost pressure control valve. I replaced that and it made no difference. I cleaned the MAF and checked for vacuum leaks, still no improvement.
The EGR valve was stuck fast. I used EGR cleaner from behind and no difference to the problem.

I managed to get the EGR valve out by using a small hammer and tapping a scissor blade in behind the gasket and slowly working it around. With patience, it started to edge away and eventually came out after about 15 minutes of fettling.

The EGR was very dirty but the valve itself seemed to open and close fine. I gave it a really good clean not expecting much as the valve seemed to be shutting ok. Obviously it wasn’t closing fully and a small amount of exhaust gas was getting through. This clearly messed up the fuel air mixture at low revs.

I was amazed at the difference when I refitted the EGR. Still a bit sluggish below 1750rpm but still pulls fine. Before cleaning the EGR, the engine was completely gutless below 2500rpm and would completely bog down below 2000rpm.

I have ordered a new MAF as the old one is pretty grubby. Hopefully that will give even more improvement.

I have used Wynns Turbo cleaner. That helped turbo response and has stopped a bit of noise at high revs. I also used Wynns EGR cleaner to clean the system up a bit. It didn’t clean the EGR much while it was still fitted and didn’t do a great job of cleaning the residue when I had removed the EGR for cleaning. A strong detergent was far better.

I will provide an update once I fit the new MAF.

[ianbrown]

My 2007 Nissan Primastar 2.0DCi got so bad it barely had the power to get into the workshop, All I did was clean the EGR (take the whole front of the van off, absolute ball ache!) buy now it runs sweet as a nut!

[kitcarbuild]

2 months on and the van is running perfectly. The smoke problem has gone away and the van starts first time even after sitting through the cold weather and snow. EGR clean and new MAF sensor did the job.

[rodneyhedger]

I had the same problem I put a new airflow sensor now it works perfectly

[kqqpdhl]

Full service on these vans every 5000 miles.
Egr valve off every time and clean up,
Make sure it’s opening etc .
Oil flush before service .
Emissions additive in fuel / make sure fuel is low and run fir 20 miles.
Swop crankshaft sensor while your on.

[paulmac]

just had a Trafic (1.9dci)in with power loss problems, basically it was a vacuum problem No vacuum to turbo control valve . this van had only one small vacuum pipe off pump and there was no vacuum there . taking the plastic fitting off the pump it was apparent the unit was blocked . i simply drilled a hole through using a small drill (1-1.5mm) and the vacuum was restored . Even low vacuum on this pipe will affect turbo . a cheap check if anyone is having similar problems

[rodneyhedger]

Ii had the same problem I put a new air flow sensor now no problem now good

[elnmbre]

I had a simular problem. It was a leak in a hose building up boost pressure (not shure what its called). Replaced it at the car ran perfect.

[danbilotto]

I have had that problem on megane 2 1.9 dci, changed maf, egr without benefit. the problem was CLOGGED CATALYTIC CONVERTER.

[accipiternisus]

I had problem with boost pressure sensor.
When you shake new sensor in hands you must hear sound of mowing parts inside, but mine old one was totally rusted inside solenoid.As i notice water comes near rubber from glass shield and leaking to engine it comes also over solenoid and over some time it block valve totally with rust

[simoncarpenter]

I had the same problem just changed the m.a.f all fixed

[themagpie_]

i had this, it was the boost control valve. though mine woiuld throw up the engine management light on dash..

[chrislawrence]

Did you get any codes coming up on it?

[warriormike]

Whats FIXED ? EGR cleaning or replace?

[AllanJames]

Hi mate what is that thing called with wires to the right of ye please?

[dannybartlett]

you have not fixed the problem mate lool