V8V cuts out
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XLR Motorsport

Original Poster:

195 posts

232 months

Monday 4th September 2017
quotequote all
It's happened three times now, firstly going round a right-hander in 4th about 35-40mph, again around a left-hander in 2nd about 15mph, each time with the throttle half open, then again clutch down coming to a stand at a set of lights (whereby the car stalled).

The two occasions when moving, there was a big hesitation in the power for less than half a second before the car picked up again.

My initial thoughts were airflow or fuel starvation?

Murph7355

42,056 posts

287 months

Monday 4th September 2017
quotequote all
How old is the car?

Do a search on here as this was a "common" (certainly more than 1 case smile) issue on earlier cars (before 2008 I think).

Petrol cap/tank rings bells.

petop

2,410 posts

197 months

Monday 4th September 2017
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Murph7355 said:
How old is the car?

Do a search on here as this was a "common" (certainly more than 1 case smile) issue on earlier cars (before 2008 I think).

Petrol cap/tank rings bells.
and 4.7 2008's. It happens/happened to mine a few times exactly how you describe. If you look at Redpants page I think he came up with a cause and solution to do with the vent tube that inside the tank becomes perished which causes a vacuum (??) in the tank.

XLR Motorsport

Original Poster:

195 posts

232 months

Monday 4th September 2017
quotequote all
Thank you both. MY2010 so 4.7

justin220

5,764 posts

235 months

Monday 4th September 2017
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Is it a roadster? Mine did something similar when water was getting into the door card via a cracked seal, and caused a control module to corrode..

JohnG1

3,487 posts

236 months

Monday 4th September 2017
quotequote all
What was the weather like?

How full was the petrol tank?

I had this problem with my 4.3 V8. After a lot of fighting, AML diagnosed the problem and did £4000 or so of work to fix the problem.

There are a number of different problems, that redpants thing is one of them. The other problem is the fuel tank air purge line dumps neat fuel into the inlet manifold and that floods the engine. So the closed loop lambda system shuts down fuelling to the engine.

Manufacturing defect, should have been a product recall. Potentially fatal.

Answer above questions. Also, look for the thread on here. We've seen/done this one before!


XLR Motorsport

Original Poster:

195 posts

232 months

Tuesday 5th September 2017
quotequote all
JohnG1 said:
What was the weather like?

How full was the petrol tank?

I had this problem with my 4.3 V8. After a lot of fighting, AML diagnosed the problem and did £4000 or so of work to fix the problem.

There are a number of different problems, that redpants thing is one of them. The other problem is the fuel tank air purge line dumps neat fuel into the inlet manifold and that floods the engine. So the closed loop lambda system shuts down fuelling to the engine.

Manufacturing defect, should have been a product recall. Potentially fatal.

Answer above questions. Also, look for the thread on here. We've seen/done this one before!
Thanks John. I spent a good couple of hours researching it yesterday, including reading through the previous threads from several years ago. Will definitely gather that information before approaching the dealer with it.

telum01

987 posts

146 months

Friday 8th September 2017
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Here's the Redpants thing they're referring to:
http://www.redpants.lol/blog/2015/12/1/the-infamou...

SL500UK

374 posts

184 months

Saturday 9th September 2017
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Does it cut out very often? I think mine's done it 4 or 5 times out of 8 years of ownership so I've not really given it too much thought. My one hasn't cut-out for well over a year, maybe two..... Good luck with yours.

Ken Figenus

6,011 posts

148 months

Saturday 9th September 2017
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Friend had a huge issue with this on a 2014 car and dealer couldn't diagnose. Factory eventually diagnosed a faulty brake pressure sensor transducer on the servo. £60 component. I would replace that immediately to rule it out.