Tamora stuttering at high revs
Discussion
Just pondering something about my old Tamora.
Before it blew its engine, I remember it would sometimes stutter at high revs (6000+ rpm) in 1st or 2nd gear. It was quite disconcerting and would cut back for a few seconds before revving up again. Sometimes would happen if I was taking on a particularly challenging overtaking manoeuvre.
Has anyone had this or think it may have contributed to the head gasket blowing?
Castle TVR thought it may have been the throttle pots, but a realigning of those didn't seem to cure the problem.
Before it blew its engine, I remember it would sometimes stutter at high revs (6000+ rpm) in 1st or 2nd gear. It was quite disconcerting and would cut back for a few seconds before revving up again. Sometimes would happen if I was taking on a particularly challenging overtaking manoeuvre.
Has anyone had this or think it may have contributed to the head gasket blowing?
Castle TVR thought it may have been the throttle pots, but a realigning of those didn't seem to cure the problem.
wierd, i seem to have had this happen a few times under full load at high rpm over the last few weeks, London tvr told me it could be the cats blocking the exhaust flow at high rpm, but tbh its as if someone slams the brakes on for a second, then off she goes again.
i had my throttle pots re-aligned 3000 miles ago
im gonna get the cats checked out next week
anyone else ever had these symptoms?
i had my throttle pots re-aligned 3000 miles ago
im gonna get the cats checked out next week
anyone else ever had these symptoms?
hollowpockets said:
im gonna get the cats checked out next week
anyone else ever had these symptoms?
anyone else ever had these symptoms?
I've been getting this on my Tuscan since the last service.
I don't think catalysts are to blame as I don't have any!
I've had a new set of HT leads fitted which can rectify a misfire, but the problem persists......
Only at full throttle - not anywhere else....I too suspect the throttle pots; maybe one has a worn track only at that point? I don't think alignment is the issue in this case.
Failing that, the usual suspects are plugs and coil, but I have heard tales of high rev. misfires being caused by something as simple as electrical interference caused by loose connection or close physical proximity (to the HT leads) of the crank sensor wires.
It could be something as simple as a dodgy earth connection, but I'm pretty sure that would give symptoms at other throttle openings.
I'm getting Austec to investigate this weekend - I'll let you know the outcome.
Neill
Thank you chaps - interesting reading.
Would be interested to see what Austec say and if it is valve related. I don't think it was the throttle pots.
I was trying to see if this may have been related to the head gasket giving way over cylinder 6 and the subsequent cracking of the cylinder lining.
Can anyone see it being related?
Would be interested to see what Austec say and if it is valve related. I don't think it was the throttle pots.
I was trying to see if this may have been related to the head gasket giving way over cylinder 6 and the subsequent cracking of the cylinder lining.
Can anyone see it being related?
It is definitely not valve / clearance related!
The problem only started after the 36k service (which includes clearances), and recently I noticed a slight tappet sound from one cylinder when cold, so it was straight back to Austec on the back of a low-loader where the top end was thoroughly checked and pronounced OK.
The noise was one tappet that needed a fettle and me being over-paranoid!
The misfire remains........
The problem only started after the 36k service (which includes clearances), and recently I noticed a slight tappet sound from one cylinder when cold, so it was straight back to Austec on the back of a low-loader where the top end was thoroughly checked and pronounced OK.
The noise was one tappet that needed a fettle and me being over-paranoid!
The misfire remains........
Evening all. I am a recent addition to the exclusive Tamora club and have also noticed a stuttering lately at circa 6,000 rpm, but only in 2nd and 3rd gears though. I am not uber technically minded and therefore not sure what might be causing it. I'm fairly comforted though not to be the only one to experience this, but I'm equally concerned re: head gaskets going etc. Eagerly awaiting your diagnosis from Austec.
Good luck guys.
Good luck guys.
im really not sure what my car is doing, i doing know if its temprature related or even if we are all experiencing the same thing but after a conversation with london tvr, he suggested throttles not being set right but they were re-done 3k ago,and also to try >>>>>
remove my airbox and clean the throttle bodies
bit oily and greasy, held the butterflies open and used a clean towel to wipe away the crud (mix of dust and oil vapour from breather pipe) where they sit, WOW, it idles at 800rpm instead of 600rpm and so much smoother, doesnt need the right foot to help get it started and pedal response is noticably improved
took it for a good run and got the oil upto 70+ and gave it some welly to 6500rpm in first and second and third (with the wheels spinning in the wet) a few times and not once did i get the choked/jerking/misfiring feeling that was happening before. Good proper smooth power right through the revs.
you can only give it a try, hoping thats it but only time will tell
remove my airbox and clean the throttle bodies
bit oily and greasy, held the butterflies open and used a clean towel to wipe away the crud (mix of dust and oil vapour from breather pipe) where they sit, WOW, it idles at 800rpm instead of 600rpm and so much smoother, doesnt need the right foot to help get it started and pedal response is noticably improved
took it for a good run and got the oil upto 70+ and gave it some welly to 6500rpm in first and second and third (with the wheels spinning in the wet) a few times and not once did i get the choked/jerking/misfiring feeling that was happening before. Good proper smooth power right through the revs.
you can only give it a try, hoping thats it but only time will tell
are the filters being pre-oiled just a little too much and crapping up the throttle bodies?Hi Guys 
!
Just got a mail from phil350i so i became a little interested in the Tamora, T350 & Sagaris forum. I saw then that some of you seem to have about the same problem as i had on my Cerb SP6 last october. The car has a engine that is rebuilt in aug/sept 2005 and have the latest ECU-chip, the same as a Tuscan S 2006.
On the tread below, You can see how i solved the problem with hesitation at 5500-6000 rpm:s:
www.pistonheads.co.uk/gassing/topic.asp?h=0&f=6&t=313122
It is a sensitive engine and electronics for it is just as sensitive, so everything needs to be in perfect condition.
// Peppe
! Just got a mail from phil350i so i became a little interested in the Tamora, T350 & Sagaris forum. I saw then that some of you seem to have about the same problem as i had on my Cerb SP6 last october. The car has a engine that is rebuilt in aug/sept 2005 and have the latest ECU-chip, the same as a Tuscan S 2006.
On the tread below, You can see how i solved the problem with hesitation at 5500-6000 rpm:s:
www.pistonheads.co.uk/gassing/topic.asp?h=0&f=6&t=313122
It is a sensitive engine and electronics for it is just as sensitive, so everything needs to be in perfect condition.
// Peppe
Edited by Peppe on Thursday 15th March 21:29
nelly1 said:
It is definitely not valve / clearance related!
The problem only started after the 36k service (which includes clearances), and recently I noticed a slight tappet sound from one cylinder when cold, so it was straight back to Austec on the back of a low-loader where the top end was thoroughly checked and pronounced OK.
The noise was one tappet that needed a fettle and me being over-paranoid!
The misfire remains........
The problem only started after the 36k service (which includes clearances), and recently I noticed a slight tappet sound from one cylinder when cold, so it was straight back to Austec on the back of a low-loader where the top end was thoroughly checked and pronounced OK.
The noise was one tappet that needed a fettle and me being over-paranoid!
The misfire remains........
The misfire is..........gone!!!!!
It was finally traced to the EEPROM (chip) in the ECU.
Swapped for another and back to rev. heaven!!
I'd forgotten the joy of those last 1500rpm.........
Edited by nelly1 on Sunday 18th March 10:30
Cheers Hollowpockets. Took your advice at the weekend, removed the airbox and cleaned the throttle bodies. Didn't seem that "crudy", but I set about it as you described. 150 miles later (some of the miles more fun than others ) and no stuttering whatsoever! Idling 200-250 rpm higher and simply on song.
As you mentioned it may not be the long term solution, but it's certainly cured the problem for now. Cheers!
) and no stuttering whatsoever! Idling 200-250 rpm higher and simply on song. As you mentioned it may not be the long term solution, but it's certainly cured the problem for now. Cheers!
Lordy said:
Cheers Hollowpockets. Took your advice at the weekend, removed the airbox and cleaned the throttle bodies. Didn't seem that "crudy", but I set about it as you described. 150 miles later (some of the miles more fun than others ) and no stuttering whatsoever! Idling 200-250 rpm higher and simply on song.
As you mentioned it may not be the long term solution, but it's certainly cured the problem for now. Cheers!
) and no stuttering whatsoever! Idling 200-250 rpm higher and simply on song. As you mentioned it may not be the long term solution, but it's certainly cured the problem for now. Cheers!
Just a thought but if you over fill with oil it can come back
up the breather and oil up the air fillter which in turn will coat the thottle boddies in oil residue..
When you have the plenum off check that the butterflies dont stick either
This is regularly the throttle bodies wearing on the S6 engine. TVR, in their infinite wisdom, designed them without any kind of bush/similar. Ho hum. (Now it could also be HT leads, ECUs, etc. etc. but the old - and possibly newer - throttle bodies were never good for more than about 20,000 miles)
Dreadnought up in Scotland did some swanky uprated ones, from memory. SFR in Stockport did likewise. I went for the latter given proximity.
Not sure if the problem also plagues the later/3.6/etc. cars, but it was a VERY common problem in the past.
Hi Nelly! How's the old girl running these days? Want to offload her? 
Dreadnought up in Scotland did some swanky uprated ones, from memory. SFR in Stockport did likewise. I went for the latter given proximity.
Not sure if the problem also plagues the later/3.6/etc. cars, but it was a VERY common problem in the past.
Hi Nelly! How's the old girl running these days? Want to offload her? Lordy said:
Cheers Hollowpockets. Took your advice at the weekend, removed the airbox and cleaned the throttle bodies. Didn't seem that "crudy", but I set about it as you described. 150 miles later (some of the miles more fun than others ) and no stuttering whatsoever! Idling 200-250 rpm higher and simply on song.
As you mentioned it may not be the long term solution, but it's certainly cured the problem for now. Cheers!
) and no stuttering whatsoever! Idling 200-250 rpm higher and simply on song. As you mentioned it may not be the long term solution, but it's certainly cured the problem for now. Cheers!
as with most things tvr, the simple maintenence of removing, cleaning and refitting goes a long way to making them last and run properly.
i also have not had a stutter since i cleaned them,
glad i could help
A little bizarre, useful to know to add to checklist! 
Thanks Paul - you coming to Oulton on Saturday?
Will also reply on the other thread as well - voltage drop.
Basically the fuse had partially fractured and providing much much resistance/arc - causing cable to overheat on one side, melting fuse holder partially and darkening insulation. Clues were smell, low voltage on pod and stuttering at 6K RPM (not enough juice for ignition?)
Replaced fuse, holder, locking nuts etc (big thanks to Clever Trevor) - hey presto - very quick, non smelly Tam again
Coach
Will also reply on the other thread as well - voltage drop.
Basically the fuse had partially fractured and providing much much resistance/arc - causing cable to overheat on one side, melting fuse holder partially and darkening insulation. Clues were smell, low voltage on pod and stuttering at 6K RPM (not enough juice for ignition?)
Replaced fuse, holder, locking nuts etc (big thanks to Clever Trevor) - hey presto - very quick, non smelly Tam again
Coach
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