v6 rev limit

**smrw** · by **smrw** » Fri Aug 10, 2012 8:48 pm

Anyone come across this one?
In cold weather all is fine, but when the ambient temp. gets much above 20 the engine won't do more than about 2K revs. I thought it might be the air intake sensor, so I changed that, but to no avail. Any suggestions?
-smrw-

v6 steve · by **v6 steve** » Sat Aug 11, 2012 12:32 am

have you done a paperclip test ? there must be a fault code

Mark1 · by **Mark1** » Sat Aug 11, 2012 8:32 am

Sounds like it's dropping into limp mode.

**smrw** · by **smrw** » Sat Aug 11, 2012 2:02 pm

No difference whether engine is hot or cold.
There is no error code, either - the engine electrics warning does not show when this happens. I read the memory with an op-com module, but no fault code was there.

**smrw** · by **smrw** » Sun Aug 12, 2012 8:14 am

I'm down in the deep south - Southampton. The fault first showed up on a sunny day in Bournemouth. It was a slow drive home! Next morning it was revving fine, until the day warmed up.

**smrw** · by **smrw** » Mon Aug 20, 2012 6:32 pm

Sorry - I haven't been able to work out what the TC motor is. Obviously not twin carb, it has four camshafts so it's not twin cam, not a turbo cooler as its a v6. Could you enlighten me?
-SMRW

Allys Cally · by **Allys Cally** » Mon Aug 20, 2012 6:40 pm

tc- traction control, the tc unit sits between the throttle body and inlet manifold

**chriskoi** · by **chriskoi** » Mon Aug 20, 2012 7:27 pm

My TC light is on, (to dear to fix

), but it still revs through range

Allys Cally · by **Allys Cally** » Mon Aug 20, 2012 8:03 pm

to be fair my TC has never worked either, had the butterfly removed and took the bulb out the dash. problem solved

**chriskoi** · by **chriskoi** » Mon Aug 20, 2012 8:34 pm

Nice one,but i did something little more tech.

I cut out a warning light size piece of black insu tape and stuck over it !

**smrw** · by **smrw** » Thu Aug 23, 2012 4:18 pm

OK - I've fiddled with the TC motor. With the engine off the connecting lever can be moved smoothly though its travel. With the engine ticking over it moves through about 5 degrees and then I can feel it coming up against the tip of a rotating cam or similar inside the motor stopping further movement - the lever vibrates as the motor rotates. Any help?
While I'm in TC territory, I had assumed that the traction control was switched on by means of the button near the base of the gear lever. Research into the manuals I have suggests that I have that the wrong way round, and that TC is ON when the car is started. The TC light comes on if I then press the button. It does not flicker at any point to suggest a fault.
-smrw

Mark1 · by **Mark1** » Thu Aug 23, 2012 5:01 pm

TC is on all the time, you do need to press the button to switch it off.

**smrw** · by **smrw** » Thu Sep 06, 2012 4:40 pm

It has been suggested to me that it could be the fuel pump. That fits most of the symptoms - like the limiting when I try to accelerate - and the temperature bit may just be that the hot day pushed a poorly pump over the brink. I'll do some checking up.
SMRW

**smrw** · by **smrw** » Sat Oct 06, 2012 4:48 pm

I have replaced the fuel pump and filter. No difference. I now have a spare (if used) in-tank pump and filter. The next thing I shall attack is the throttle potentiometer. Watch this space!
-smrw

**smrw** · by **smrw** » Sat Oct 06, 2012 7:30 pm

Still in Southampton
-smrw

v6 rev limit

v6 rev limit

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