Hesitant engine / low pressure

Tiny
GREENFIJ
  • MEMBER
  • 2020 VOLKSWAGEN TIGUAN
  • 1.5L
  • 4 CYL
  • AUTOMATIC
  • 3,600 MILES
The vehicle has been plagued with electrical faults and power issues since I took delivery.

It’s been in and out of VW so many times, but no faults have yet been fixed. I’ve tried to reject the vehicle on the grounds that the electrical faults have still not been fixed despite giving them 2 opportunities to put it right. They have further conceded that there is a particular fault but insufficient grounds for rejection - something I do not accept as the car is NOT fit for the purpose.

The power issues (Or rather lack of power) which are identical to those detailed here:

My wife and I noticed loss of power, in particular when pulling away from a junction, there was just no power. This was reported to Lex vehicle leasing immediately, however due to current time constraints, and lack of courtesy vehicles, I didn’t have the opportunity to take this to a Volkswagen dealer for inspection. No warning lights appeared. The particular fault is almost exact identical to The one in the link below:
https://www.honestjohn.co.uk/news/driving-1/2020-07/volkswagen-confirms-no-further-measures-planned-in-regards-to-15-tsi-issues/

On 10th April I accidentally misfueled the car (diesel in petrol) and then proceeded to drive c6-7 miles before the car broke down. I was only made aware once the vehicle was recovered to a local vw dealership a couple of days later.

Vw are denying any problems existed with the vehicle prior to the misfuel as I never took the car to a vw garage due not having sufficient time to do so as I lead a busy work life and have 3 children to take/collect from school etc. Also, vw had no courtesy vehicles, and I couldn’t be without the car due to prior commitments that could not be rescheduled.

The diesel was drained, cleansed and then refuelled with petrol (by Fuel Fixer) when the car was taken to Citygate VW Watford. Fuel Fixer managed to return the car to its pre-misfuel state after cleaning the spark plugs and engine system thoroughly.
I drove the vehicle back home - no warning lights at all. A couple of days later on a school run, the intermittent power issue that i had been experiencing raised itself again and the vehicle failed to deliver power as I was coming out of a junction. This happened twice. The engine management light then appeared. I spoke to Lex and booked the vehicle into Citygate VW Ruislip. This different dealer was suggested as the previous dealer (Citygate watford) failed to rectify the previous technical faults. On inspection, VW advised that there are serious engine faults that need further investigations and that these are caused by the misfuel, and as a result must be paid for my me, not under warranty. How can this be, when the vehicle was returned to me in the pre-misfuel state and still presenting the problems that existed prior to the misfuel.

My stance is that these are the same problems that existed that I reported to Lex on 8th The vehicle has been plagued with electrical faults and power issues since I took delivery.

It’s been in and out of VW so many times, but no faults have yet been fixed. I’ve tried to reject the vehicle on the grounds that the electrical faults have still not been fixed despite giving them 2 opportunities to put it right. They have further conceded that there is a particular fault but insufficient grounds for rejection - something I do not accept as the car is NOT fit for the purpose.

The power issues (Or rather lack of power) which are identical to those detailed here:

https://www.honestjohn.co.uk/news/driving-1/2020-07/volkswagen-confirms-no-further-measures-planned-in-regards-to-15-tsi-issues/
...Where VW admit to these problems, was notified to Lex on 8th April in a phone call (which was recorded by Lex and I am still awaiting copy of the recording).

On 10th April, due to a whole host of personal issues and the ongoing stresses of driving a car riddled with issues from the outset, I accidentally misfueled the car (diesel in petrol) and then proceeded to drive c6-7 miles before the car broke down. I was only made aware once the vehicle was recovered to a local vw dealership a couple of days later.

Vw are denying any problems existed with the vehicle prior to the misfuel as I never took the car to a vw garage due not having sufficient time to do so as I lead a busy work life and have 3 children to take/collect from school etc. Also, vw had no courtesy vehicles, and I couldn’t be without the car due to prior commitments that could not be rescheduled.

The diesel was drained, cleansed and then refuelled with petrol (by Fuel Fixer) when the car was taken to Citygate VW Watford. Fuel Fixer managed to return the car to its pre-misfuel state after cleaning the spark plugs and engine system thoroughly.
I drove the vehicle back home - no warning lights at all. A couple of days later on a schoo run, the intermittent power issue that i had been experiencing raised itself again and the vehicle failed to deliver power as I was coming out of a junction. This happened twice. The engine management light then appeared. I spoke to Lex and booked the vehicle into Citygate VW Ruislip. This different dealer was suggested as the previous dealer (Citygate watford) failed to rectify the previous technical faults. On inspection, VW advised that there are serious engine faults that need further investigations and that these are caused by the misfuel, and as a result must be paid for my me, not under warranty. How can this be, when the vehicle was returned to me in the pre-misfuel state and still presenting the problems that existed prior to the misfuel.

My stance is that these are the same problems that existed that I reported to Lex on 8th April..

VW are asking me to pay £4,000 for further investigations into the faults and then more to repair them. This is the labour cost to strip down the engine. They then believe there will be c£2-3k of parts.

Independent independent engineer also inspected the vehicle, at my request, and paid for by lex (And selected by Lex). His advice was that he doesn’t believe that a misfuel would cause this level of damage, and if there was extensive damage it would be much more prevalent than what is showing in the vehicle. The vehicle starts and runs well at present with no warning light visible. His advice was to change the spark plugs and fuel filter and drain and flush the engine again. Then fill up with high-grade petrol and do a prolongedTest drive.

As the car is a lease car, I am in a tricky situation. Any assistance would be greatly appreciated
Sunday, May 16th, 2021 AT 5:18 AM

4 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is an interesting issue and the problem that you have is the fact that it had the wrong fuel put in it and now you are complaining about this issue.

It may not be related but getting them to do anything about it is going to be very difficult.

However, it sounds like you are dealing with the dealerships only. Have you called the manufacturer's customer service? You mention Lex a number of times but I suspect this is the leasing company? If not, I would do that first and foremost. The dealers are fine but they do not make the finial decision on these issues. Plus they may be aware of a software update that will address this issue.

As for the issue, what were the serious engine faults that were found? Knowing what those issues are may help with figuring out if they are related or not.

https://www.2carpros.com/articles/symptoms-of-low-engine-power

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, you said that there are no faults detected. Was that prior to the fueling issue and then after they found all these serious engine issues?

Please let us know this info and we can go from there. Thanks
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Wednesday, May 19th, 2021 AT 10:49 AM
Tiny
GREENFIJ
  • MEMBER
  • 3 POSTS
Thanks for your response.
When the vehicle went into the vw dealership after I had misfueled, they advised that there were no fault codes that predated the misfuel.

The fault codes found post the misfuel were:
P047500: exhaust pressure control valve A
POA0F00: engine failed to start
P218800: engine too rich at idle, Bank 1

They did a cylinder pressure test and found the following :
Compression Cyl1 11.8 bar Cyl2 8.4 bar, Cyl3 9.2 bar, Cyl 4 7.8 bar.
The tests carried out were to carry out a compression test (see above results) and a cylinder head leakage test.

No signs of cylinder head concerns, but we found the following on the results from the compression tests:
Invst. Lack of power. R/I spark plugs found low compressions. C/O cyl. Leakage test, found pressure to escape via rings hence excess PCV pressure. Req removal of cylinder head and pistons to check if repairable.

I now have the car back with no repairs done. I drove the car and found the same low power issue in pulling away still there, but all the time now. Hill starts are a no go, unless facing downhill. At speed the engine sounds fine. No smoking at all.
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Wednesday, May 19th, 2021 AT 11:54 AM
Tiny
GREENFIJ
  • MEMBER
  • 3 POSTS
In addition, I have spoken to VW Uk but they referred me to the local dealer and seemed like they didn’t want to help in any way due to the misfuel, which happened after I reported the power issues to my lease company, LEX
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Wednesday, May 19th, 2021 AT 11:55 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Now I understand. So the reason for the low power is the low compression and if it is escaping from the crankcase then that would mean it is from the rings. So they appear to be correct with their diagnosis but the issue is you are going to have to prove that this was there prior to putting diesel in the tank.

Here are some guides that will help with this:

https://www.2carpros.com/articles/symptoms-of-low-compression

https://www.2carpros.com/articles/the-reasons-for-low-compression

It is hard to say for sure that diesel in the fuel would cause the rings to leak compression but it is possible, so that means the burden of proof is on you to show that this was either there prior to the incident or that it was not caused by the fuel.

Since there is no documentation of the issue prior to this then I would focus on finding an expert in your area that can prove that the fuel did not cause it. This is going to be difficult as you are most likely going to have to tear the engine down and see what is wrong with the rings. This is all going to have to be at your cost as they are not going to cover it until they find a defect in the product that was not caused by the diesel.

What happens when diesel fuel mixes with fuel, it clogs things up and it can cause the rings to clog and not rotate like they are supposed too.

In my opinion, this is highly unlikely but again, you are going to have to prove it. Once you do, you will have to present it to VW and if they still deny it then you are going to have to take legal action.

If I were in your position, I would just consult an attorney at this point and see what they say or just look to get out of the lease now. The last option is to consult your insurance and see if they will cover the engine replacement.

Hopefully this helps.
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Wednesday, May 19th, 2021 AT 6:06 PM

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