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

[@kitcarbuild3927]

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.

[@emilhansen3945]

Any news to this subject? :)

[@kitcarbuild3927]

@@emilhansen3945 I did a second video after replacing the MAF sensor. The van is now perfect. Starts easily even when cold and revs freely. It is like a new van.

[@user-kq5qp6dh8l]

Just block egr valve. New maf

[@milangally7706]

@@kitcarbuild3927 I have the same problem now with the same car (2005). I replaced EGR...no to the help. I am waiting for the new Boost control valve and MAF. Can be any else wrong with car?

[@kitcarbuild3927]

@@milangally7706 The replacement MAF was the biggest difference for me. A vacuum leak can also cause similar symptoms. I got a cheap eBay MAF and it only lasted 1,000 miles before I had to replace it. Buy a decent branded MAF if you can. Good luck. I hope the new parts will cure your van

[@kitcarbuild3927]

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.

[@dannybartlett4225]

blowing smoke is because water is leaking thou onto your airbox filling it with water next time we have a down pour take ya airbox off your have a cup full of water in there

[@ianbrown9082]

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!

[@themagpie_1]

its a 30min job on the 1.9cdti. which is the F9Q engine code. i`m glad i don`t have the layout you have, that egr is located way down low..

[@rodneyhedger9574]

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

[@user-kq5qp6dh8l]

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.

[@paulmac63]

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

[@kitcarbuild3927]

Thanks for adding this. I checked for a vacuum leak and replaced the boost pressure solenoid before cleaning the EGR and replacing the MAF. It can be frustrating to figure out what the cause is.

[@jarpar3414]

Hi mate. Where do you drill the hole

[@paulmac63]

@@jarpar3414 if it is the same take the plastic fitting off the vacuum pump and you will have the big outlet for the brake servo . Just below there is a small outlet with the control valve pipe attached to it . Pull the pipe off and drill through the small fitment with a drill till you see it coming through to the larger fitting (if that makes sense) , that should restore vacuum to turbo .As said you only need a small drill 1-1.5mm , a big drill wouldn't go into the fitting anyway

[@rodneyhedger9574]

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

[@eln0mbre]

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.

[@ssdivizion]

Which hose dude? On the intercooler or?

[@eln0mbre]

@@ssdivizion I dont have the car in front of me right now. I will check tomorrow and get back to you :) It can also be a faulty boost pressure sensor that is connected to the same hose. If i remember correct the hose went from the egr valve on the right side of the engine, and the sensor is on the left side

[@ssdivizion]

@@eln0mbre Check it is the intercooler tube on which the small MAP sensor stands

[@eln0mbre]

​@@ssdivizion Just found the transelation from norwegian to english on the hose i replaced. It is the "Charger Intake Hose" and the sensor i said is connected to that hose with a smaller tube to register the pressure. Hope that helped a bit to recognice the part.

[@accipiternisus649]

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

[@danbilotto7785]

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

[@karimmk7052]

Thanks

[@themagpie_1]

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

[@simoncarpenter1102]

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

[@fasteee]

Is the maf expensive

[@warriormike387]

Whats FIXED ? EGR cleaning or replace?

[@kitcarbuild3927]

Hi - cleaning the EGR made a big difference but wasn’t the complete solution. Replacing the MAF was the final fix. If you want to check your MAF, unplug it while the engine is running. If it makes no difference, the sensor probably needs replacing. It is by far the easier of the 2 issues to fix.

[@warriormike387]

@@kitcarbuild3927 Thanks bro. I will checked.

[@warriormike387]

@@kitcarbuild3927 Hi, thank you very much for your help! If I ever visit England, if I believe you live there, I'll invite you for a cold beer. My car was fixed. :) I pulled the MAF sensor and the power came back. Thanks again. Have a nice day my friend.

[@chrislawrence8030]

Did you get any codes coming up on it?

[@officecarslz1789]

Good 🇧🇷

[@AllanJames88]

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

[@themagpie_1]

its cold air pre heaters for really cold starts.. they throw up codes all the time, but have no real effect on starting tbh. they also rot and fall apart quickly. mine are all taped up. they on my list of jobs, just because it looks horrible..

[@Tal5258]

How many miles on your van?

[@kitcarbuild3927]

146k

[@WalkInTheParkPlaygroup]

Where is part 2 at?

[@kitcarbuild3927]

kzbin.info/www/bejne/n4PGm3adrLBjp6c

[@faroukkhan6777]

Thanks where is part 2??? thanks

[@keithrobinson686]

MAP

[@dannybartlett4225]

you have not fixed the problem mate lool