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Toyota RAV 4 Poor Acceleration Problems

Toyota RAV 4 Poor Acceleration Problems? Caused by the “Suction Control Valve” (SCV)

Toyota RAV 4 Poor Acceleration Problems

Toyota RAV 4 problem just happened overnight

So, as I have said before, one of the great things about owning a garage. Importantly, is the diversity of jobs that we can encounter. Hence in any busy working week. This past week was no exception. One of our lady customers called it with her car, a Toyota RAV 4 !

Toyota RAV 4 Poor Acceleration Problems

The Toyota RAV 4 ready for the engine work to be carried out.

Alarmingly, the reason was that the car was performing badly when trying to overtake. Especially, when she put her foot down the car was very slow to respond.

She had a new Duel Mass Flywheel fitted about six months ago ! Interestingly,  she had wondered if this could have anything to do with the cars recent problem?

The Toyota RAV 4 was fitted with the 2.0D-4 D engine. Importantly, she had not experienced many engine problems in the past. In fact apart from the clutch the car had been trouble free.

Ryan road tests the car !

When Ryan our workshop manager took the car out for a test drive. So, he noticed that the engine warning light was also illuminated . So on his return he plugged the car into our diagnostics machine. Finding that the code PO627 came up. When we looked the code fault up on our diagnostic site. Then it stated that the problem could be a couple of things.

  1. That the internal fuel was below the target fuel pressure that it should be, despite the engine ECU opens the Suction Control Valve (SCV)
  2. Fuel blockage.

Toyota RAV 42.0 D Engines are fitted with a Denso electronic high-pressure fuel pump.  Controlling, the fuel rail pressure and the volume of fuel and are both replaceable items. Denso also make the Fuel Pressure Regulator (we call it the SCV) that can cause the lack of power problems with the Toyota RAV4

Toyota RAV 4

Arrow pointing at the position of the diesel pump

Problems.

Ryan suspected it to be the SCV and this was confirmed by a quick phone call to a friend of ours that specialises in diesel engines and fuel pumps. He told us that the SCV Valves had given most him most problems with this particular RAV 4 engine fault and so we took onto ourselves to tackle this particular problem.

New SCV ordered for the Toyota RAV 4

We contacted the customer with a price. Reluctantly, she gave us the go ahead to carry out the necessary work on the car’s engine. We could only buy the SCV parts from the Toyota dealership. Unfortunately, they were not available from any of the local parts factors.

The first part of the job was to remove the two bolts that fasten the radiator expansion tank to the car. Allowing you more room to work. Importantly, you can see this in the picture the arrow is pointing to ! Where the fuel pump is located. Down near the yellow dipstick top. Ryan then had to remove the remove the air intake/inter-cooler pipe.

The only difficult thing that Ryan could see was the location of the pump, that the SCV’s were located; they were located at the back of the pump, making the job a little fiddly.

When the new Toyota RAV 4 valves arrived. Hence they were both coloured differently. So,one was green and the other red. It was important that the new ones had to fit where the old ones had come from.

Toyota RAV 4 Poor Acceleration Problems

Image showing the SCV valves in position ready to be changed, note the red and green colours and the Allen key type bolts that can be difficult to remove.

Hence the colour coding.

The valves are held into the pump by two heavy duty Allen screws each and were eventually freed by using an heavy duty Allen key type bit that fitted into an impact wrench set, with an extension tube to give him some leverage. This did the trick and the screws finally gave in to the pressure.

An important thing to watch out for is that the valve seats have two O-rings. These O-rings must be replaced and refitted into the valve seats; Ryan lubricated them when fitting them back, before the new valves were fitted back onto the pump.

Possible loss of fuel !

Another observation is that you will lose a small amount of fuel when doing this job, so protect the immediate area of the pump with some old cloth to soak up the diesel that comes out and you will not make a mess on the rest of the engine or the garage floor. We also thought it would be worth fitting a new fuel filter, and so we did.

When Ryan completed the work, he then re-set the Toyota RAV 4 engine diagnostic trouble codes , with our engine diagnostic machine and it then only took a couple of attempts to re start the engine, because there would have been a little trapped air in the system from when the valves were removed. If you are doing this job at home on your own one of these vehicles, we do recommend that you keep everything as clean as possible and do not let any dirt or other contamination onto the new valves.

The job only took about an hour

Including the ordering of the parts. Later the car was road tested and found to be cured of the problem. Happily, our lady customer picked up the Toyota RAV 4 paid us and went on her way a happy customer.

This problem can also be found on the following Toyota models

Toyota Avensis 2.0 D-4D (CDT220) 1999>2003,Toyota Avensis Verso 2.0D-4D (CLM20) 2001>2005,Toyota Corolla 2.0 D-4D (CDE110) 2000>2001,Toyota Corolla Verso 2.0 D-4D (CDE120) 001>2004,Toyota Corolla 2.0 D-4D (CDE120) 2001>2007 (90bhp & 109bhp),Toyota Previa 2.0 D-4D (CLR30) 2001>2007. This information is from Blue Print.

Eric Roberts

Toyota RAV 4

The new set of SCV valves ready to be fitted ,note the new sealing rings.

Pellon Tyre and Auto-centre offer car and van servicing and repairs to all makes of vehicles. Members of Unipart Car Care centres and give a nationwide guarantee for all our work and parts. Also sell New Economy Tyres online from our website www.pellontyres.co.uk  . So, by using the tyre selector and choosing your tyre size. Offering courtesy cars to local motorists. Needing to go to work and leave their car with us for work doing. We are also an official MOT testing station and are members of Trading Standards. Finally, who carry out checks for high standard of equipment and workmanship.

 

Peugeot 206 Estate Clutch

Clutch Vibration Problem-TOYOTA AURIS TD comes in with a Clutch Vibration Problem

Clutch Vibration Problem

TOYOTA AURIS TD comes in for a Clutch Vibration Problem

For some unknown reason.  Christmas time brings in a few cars that are having Clutch Vibration problems. Hence, these are the normal problems. So, such as the driver cannot get the gears. Or the gears grind. Thus, when trying to drive the car and so on.

The Toyota Auris was a slightly different problem. As a result, the car was sort of vibrating and rattling. Consequently, as it was been driven along. When speaking to the customer. Ryan Linton my workshop manager. Discovered that the car had only had a new clutch fitted about two years ago. So the customer found it highly unlikely. Hence, that the clutch could be causing the vibrations. Especially, when driving the car along.

Ryan explained that the only way to tell is to check the clutch for the Clutch Vibration , by stripping the housing off and taking a look. The customer agreed and he took one of our courtesy cars while we explored his car to see what the problem was.

The other clutches that were done this week were standard sort of jobs, taking two or three hours to do, but we always check with our Auto-data computer system, for the times it takes to do these jobs and this Toyota was shown to take seven hours, this included the Duel mass Flywheel having to be changed, but at this stage we did not exactly know what was wrong with the car.

Clutch Vibration Problem

Ryan  stripped down the Auris clutch housing and assembly and found that the system was a Duel Mass Flywheel  for short and that the car had only had the clutch fitted two years ago and nothing had been done to the Dual Mass Flywheel. This action had

Clutch Vibration

Old worn out clutch and Duel Mass Flywheel

Clutch Vibration

Old Clutch system still in place

caused the pressure plate and the Dual Mass Flywheel to wear prematurely and caused the DMF to have more play in it and therefore cause the Clutch Vibration.

We did not fit the other clutch, but the customer said that he would not go back there again. The cost was estimated at about the £1000.00 mark and the customer gave us the go ahead to do the job. The time given by Auto-Data was pretty accurate and it took Ryan near enough six hours to complete the job. We always fit LUK clutches and DMFs because they were the company who originally developed the products along with BMW in Germany and to date we have never had any warranty problems with the LUK products in the past.

The Toyota Auris clutch and DMF was finished, tested and returned to a happy customer another job well done by my excellent staff.

Eric Roberts

Hi I would like to introduce myself. Working in the Garage and tyre and Battery business now for 40 years. So. worked for a couple of national tyre companies before starting my first business. Of course, I now own a company here in the UK called Pellon Tyre and Auto-centre. Blogging about anything to do with cars and their related products. Naturally, that will help my business. We are members of Point-S and Trading Standards and are also a Unipart Car Care Centre.

Dual Mass Flywheels- a pain in the neck ? Riginally to smooth out diesel engined cars heavy clutches

Dual Mass Flywheels

watch out if your clutch is slipping you may have a dual mass flywheels gone as well?

Dual Mass Flywheels-As with most tyre and auto centres these days we multi-task and carry out all types of repair work, we are blessed to have mechanics that are capable of doing the other more

Dual Mass Flywheels

Dual Mass Flywheels-A recent DMF that we have fitted

difficult kinds of jobs.

One of the main problems we are finding at the moment is the number of cars that are having clutch problems.This is no real problem to us and we take it in our stride, but the most frightening thing that is becoming prevalent is the increasing number of cars that are requiring Dual Mass Flywheels.

What are dual mass flywheels

In the old days we had a simple clutch plate mechanism that would cost perhaps £200 to £300 to repair, from a small to a large car, now thanks to modern technology we have clutch and flywheels that are part of the same unit. The problem is that you can diagnose a faulty clutch but not a DMF Problems (dual mass flywheel). This seems to affect all makes of vehicles we have fitted them on VWs and Toyota’s this week alone, also on Mercedes.

The idea came out to accommodate the modern demands of the lightweight diesel engines, modern motorists demand their diesel engine runs just as smooth as a petrol engine, also giving better fuel consumption. The DMF acts like a damper between the engine and the gearbox to give a smoother ride when changing gears on a manual transmission system.

Basically, there are two types of DMF. One is made up of a primary and secondary flywheel containing springs and cushions. There is a ring between the outer and the inner flywheel that allows them to slip, this is to stop any damage to the transmission when any torque loads exceed the pressure of the vehicles rating of the transmission.

Dual Mass Flywheels

Of course, the ring is the weak spot and can wear out when too much continual engine loads are applied. We find that this could be the reason that problems seem to occur mostly in people carriers.

Of course, the second type has planetary gearing. Specially made for vehicles with low-revving engines. Hence, that give out stronger vibrations when doing low revs. This type should give much smoother gear changes on diesel engines, similar to the same performance as a petrol engine, also giving a better fuel consumption.

I hope that this is informative and that you don’t need one replacing, but if you do look forward to a big garage bill DMF Failure.

 About Eric Roberts

Hi, I would like to introduce myself. I have worked in the Garage and tyre industry now for 40 years.