Discussion
TUS 373 said:
Throttle bodies are most likley to be worn. First stage is to get them re-set - an hours job by a pro. If that does not help, or you cannot put up with it, could do with getting the bodies rebushed.
Just search on here for "worn throttle bodies".
Good advice - having mine done at the moment.
Throttle bodies balancing (tuning cost about £270), it may soon influence your idle...you may need to have the adjustment done 2-3 times as sometimes the lap top does not indicate any fluctuations...don't let them charge you for the repeat...
God this forum is scary! Every topic seems strangely familiar!
God this forum is scary! Every topic seems strangely familiar!
Well, it's a bit of a story....
Bought the car in late Jan 2005 - it's a 2001 Tuscan with some Red Rose bits.
It would never rev out past 6100rpm in the higher gears, and hesitated in the lower ones at high revs.
I've had a rebuild, and it's been re-tuned(throttle bodies each time) three times, and each time it loses the tune after 30-40 miles. ie tickover become lumpy, and there's a flat spot the size of the grand canyon between 2700-3800rpm.
It been said that the only other thing it could be is the throttle potentiometers being faulty/worn or having an intermittent fault.
The garage - Dream Machines in East Sussex, I haven't paid for any of the work since purchase, and they have been simply excellent!
I get it back on Friday
Needs to be actually because I'm off to Ireland in it on Sunday!
Bought the car in late Jan 2005 - it's a 2001 Tuscan with some Red Rose bits.
It would never rev out past 6100rpm in the higher gears, and hesitated in the lower ones at high revs.
I've had a rebuild, and it's been re-tuned(throttle bodies each time) three times, and each time it loses the tune after 30-40 miles. ie tickover become lumpy, and there's a flat spot the size of the grand canyon between 2700-3800rpm.
It been said that the only other thing it could be is the throttle potentiometers being faulty/worn or having an intermittent fault.
The garage - Dream Machines in East Sussex, I haven't paid for any of the work since purchase, and they have been simply excellent!
I get it back on Friday
Needs to be actually because I'm off to Ireland in it on Sunday! It sounds like your throttle bodies are worn. Until recently all SP6 throttle bodies were bushed, which is not a great design. More recently they now have bearings which are much longer wearing.
I had my throttle bodies replaced recently with the bearing type. The engine is much smoother and revs right through to the red-line.
You should talk to your dealer about this.
I had my throttle bodies replaced recently with the bearing type. The engine is much smoother and revs right through to the red-line.
You should talk to your dealer about this.
It's not always throttle bodies that cause this problem. The leads that cover the plugs are difficult to get out and can easily be cracked or broken upon removal. When broken ones are put back on the spark can arc out on the head, which can actually causes the hesitancy that has been described. This is a far cheaper remedy (replacing the plug lead covers...I think the Hyundai ones fit very well) than spending bulk dough on throttle bodies. Sticky injectors can also aggravate this problem, so throw in some injector cleaner when you fill up. In many cases there are several small issues that conspire to work together to point to a larger problem that may well not even be there.
Yes - that is true.
IIRC the early Tuscans had a particular lead set which was superceded by another less problematic type. Cannot remember what colour they were - must have a look in the garage as I kept the originals. Shane at SFR swapped these for better leads (identifiable by different colour) over as well as doing a re-balance and the hesitatnt running has never been a problem since. Thanks for the reminder!
IIRC the early Tuscans had a particular lead set which was superceded by another less problematic type. Cannot remember what colour they were - must have a look in the garage as I kept the originals. Shane at SFR swapped these for better leads (identifiable by different colour) over as well as doing a re-balance and the hesitatnt running has never been a problem since. Thanks for the reminder!
admiral said:
It sounds like your throttle bodies are worn. Until recently all SP6 throttle bodies were bushed, which is not a great design. More recently they now have bearings which are much longer wearing.
I had my throttle bodies replaced recently with the bearing type. The engine is much smoother and revs right through to the red-line.
You should talk to your dealer about this.
Admiral - do you know when the Speed Six got the bearings in place of bushes as standard? Just wondering which mine has (engine probably built around April 2004, car registered in June 2004).
targarama said:
It sounds like your throttle bodies are worn. Until recently all SP6 throttle bodies were bushed, which is not a great design. More recently they now have bearings which are much longer wearing.
I had my throttle bodies replaced recently with the bearing type. The engine is much smoother and revs right through to the red-line.
You should talk to your dealer about this.
Admiral - do you know when the Speed Six got the bearings in place of bushes as standard? Just wondering which mine has (engine probably built around April 2004, car registered in June 2004).
tagarama - things with TVR are never completely clear. I believe that all Sagaris's have bodies with the up-to-date bearing design. I don't know when other SP6 cars went over to bearings. I would imagine it will have been only the past few months.
Arrggh - got the car back on Friday, ran well, took it for a blast on Saturday(120miles) and the hesitation at the top end has returned 
Apparently it was caused by some water getting onto one of the plugs.
This is driving me mad, I'm with the car in Ireland at the moment, it ticks over ok, just won't rev cleanly past 6000rpm.
So should I be getting the bearings in the throttle bodies changed?
Ta
Rich
Apparently it was caused by some water getting onto one of the plugs.
This is driving me mad, I'm with the car in Ireland at the moment, it ticks over ok, just won't rev cleanly past 6000rpm.
So should I be getting the bearings in the throttle bodies changed?
Ta
Rich
A little stutter need not be bad!
My car has the odd little stutter now and then but dealer investigation reveals no wrong?
I think it is probably software glitch which is notorious in TVR Tuscan because of adaptive fuel programme.
I find flat spots and all but once warm and then thrashed it allways but allways behaves well.
...except when started from hot when....glitch.. but give it some revs ignore the coughing and it soon clears.
I think PW liked webers and tuned the injection to match...
My car has the odd little stutter now and then but dealer investigation reveals no wrong?
I think it is probably software glitch which is notorious in TVR Tuscan because of adaptive fuel programme.
I find flat spots and all but once warm and then thrashed it allways but allways behaves well.
...except when started from hot when....glitch.. but give it some revs ignore the coughing and it soon clears.
I think PW liked webers and tuned the injection to match...
admiral said:
admiral said:
It sounds like your throttle bodies are worn. Until recently all SP6 throttle bodies were bushed, which is not a great design. More recently they now have bearings which are much longer wearing.
I had my throttle bodies replaced recently with the bearing type. The engine is much smoother and revs right through to the red-line.
You should talk to your dealer about this.
Admiral - do you know when the Speed Six got the bearings in place of bushes as standard? Just wondering which mine has (engine probably built around April 2004, car registered in June 2004).
tagarama - things with TVR are never completely clear. I believe that all Sagaris's have bodies with the up-to-date bearing design. I don't know when other SP6 cars went over to bearings. I would imagine it will have been only the past few months.
That's interesting, mine need throttle bodies but I was advised not to bother 'because you will replace crap with crap' bearings were being discussed as the way forward but not in the same context as TVR Factory. Are you saying that new throttle bodies from TVR will have bearings?
dvpeace said:
targarama said:
admiral said:
It sounds like your throttle bodies are worn. Until recently all SP6 throttle bodies were bushed, which is not a great design. More recently they now have bearings which are much longer wearing.
I had my throttle bodies replaced recently with the bearing type. The engine is much smoother and revs right through to the red-line.
You should talk to your dealer about this.
Admiral - do you know when the Speed Six got the bearings in place of bushes as standard? Just wondering which mine has (engine probably built around April 2004, car registered in June 2004).
tagarama - things with TVR are never completely clear. I believe that all Sagaris's have bodies with the up-to-date bearing design. I don't know when other SP6 cars went over to bearings. I would imagine it will have been only the past few months.
That's interesting, mine need throttle bodies but I was advised not to bother 'because you will replace crap with crap' bearings were being discussed as the way forward but not in the same context as TVR Factory. Are you saying that new throttle bodies from TVR will have bearings?
Dom at Power did mine, with the bearings, 1st class job. I was having other bits done at the time so cannot tell the the precise cost. Give him a call...
Mr F
Although your symptoms can be caused by a number of issues, I had exactly your problem and updating the ECU fixed mine. There's an issue caused by vibration at higher revs on full throttle.
See here :
www.pistonheads.com/gassing/topic.asp?t=6706&f=5&h=0&hw=fish+vibration+throttle
Cheers,
Andy.
See here :
www.pistonheads.com/gassing/topic.asp?t=6706&f=5&h=0&hw=fish+vibration+throttle
Cheers,
Andy.
dvpeace said:
targarama said:
admiral said:
It sounds like your throttle bodies are worn. Until recently all SP6 throttle bodies were bushed, which is not a great design. More recently they now have bearings which are much longer wearing.
I had my throttle bodies replaced recently with the bearing type. The engine is much smoother and revs right through to the red-line.
You should talk to your dealer about this.
Admiral - do you know when the Speed Six got the bearings in place of bushes as standard? Just wondering which mine has (engine probably built around April 2004, car registered in June 2004).
tagarama - things with TVR are never completely clear. I believe that all Sagaris's have bodies with the up-to-date bearing design. I don't know when other SP6 cars went over to bearings. I would imagine it will have been only the past few months.
That's interesting, mine need throttle bodies but I was advised not to bother 'because you will replace crap with crap' bearings were being discussed as the way forward but not in the same context as TVR Factory. Are you saying that new throttle bodies from TVR will have bearings?
I can't say for sure. You need your dealer to talk to the factory to ensure that they will issue you with bearing based bodies. I use Castle, and we had to work together on getting this stuff sorted out on my car. They're pretty clued now on all the issues.
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