PLEASE HELP HELP HELP TRV/TUSCAN EXPERTS

[miteequinn]

Dear ALL

I have a Tuscan S6 2000 which has recently started to jump when driving and the red light flashes on. Initially the rev counter would shoot to 35 then back down to 13, then up to 27, etc. Now it is just the jumping and red light.

It has been into the garage 3 times and had -

1. The CPU tested which is OK

2. The engine sensor (?) replaced

3. The earth cleaned and tightened

4. full service

and now we are all stumped on what could be causing it, it looks like we could endlessly go on by process of elimination until solving it, but as a short cut has anybody else experienced this problem?

It gives the same sensation as Kangaroo petrol +occasional slow reaction to accelerator pressure, but has been going on for about one month now.

It doesnt seem to happen when the car is ticking over only when it is in gear and rolling.

Any advice, help, ideas welcomed.

Many Thanks

MQ

[andyvdg]

Interesting....is the red light the red change up light ?

How does the ECU determine engine speed (I'm assuming the stuttering
is the ECU seeing the engine overrevving and hitting the rev limiter) ?
If you go to the "maximum" screen, what is the max rpm shown ?

There is a cable which goes between the engine and the passenger compartment.
I can't remember exactly where is goes (others will know), but if it gets water in it it can cause problems.
Another theory - some earlier cars suffer "disco" flashing change up lights (all of them coming on occasionally). This wouldn't affect the stuttering - and may indicate the stuttering is down to worn throttle bodies (usually experienced constant speed between 2500 and 3500 rpm).

Or it could be other things.....

Hope this helps!

Cheers,

Andy.

[basil brush]

My '00 Tuscan flashes the change up lights occaisonally when driving along, but doesn't affect anything else. It sounds like a dodgy connection/broken wire or something feeding current into the engine speed signal to the ECU, which makes it think the revs are higher than they are. I'm not sure how the S6 measures engine speed - I'm assuming it has got a flywheel sensor?

[rralston]

Yep - have they checked the....

ECU wiring
Throttle boddies
Throttle Potentiometers

These are all the classic ones that make it jump a bit!

Good luck

[tuscan't]

When I owned a Tuscan it started kangaroo'ing. Hesitating under acceleration, then jumping. The revs were also eratic at idle.

The hesitation was most noticeable on the motorway, when the accelerator was given a nudge there was a delay, then a jump, hesitation, jump. It was very noticeable.

If these are the same symptoms then from memory I needed the throttle pots replaced, which wasn't a major task.

[miteequinn]

Thanks all so much for input - Here the latest in this situation that is driving me nuts

Yesterday (Wednesday) the engine sensor was changed. This proved to be a vast improvement, the jumping was almost reduced to nothing but I was sure I was still seeing the red light flickering - difficult to tell with bright sunlight, brake lights and mind tricks.

Today the 2 throttle sensors were replaced, the tick over readjusted (since service 1 week ago it dropped from 7/8 to 7/6) following this it was even worse than before.

So its gone back in now - the TVR guyis convinced it is something a wire in th loom of the ECU connector, so hes rigged it up to the computer again to have a check.

Needless to say this is driving him nuts aswell.

I'm keeping him posted on the other suggestions.

Many many Thanks again

MQ

As a footnote - When the car was better yesterday I was pulled over at 120 MPH (190kph) in a 120 KPH zone by the Belgium cops (I live in Belgium during the week), luckily they were more in love with the car than the law - but of course didn't believe my story about engine problems - just a 'Drive carefully'.

If you cops read this - you'll go to heaven, you rock!!!!