lumpy/ rough/jerky any ideas?

[Andy chimaera]

hi i hvae a normal 400 and ever since i had the car, it seems to run very rough and lumpy on tick over, also driving around in car parks is almost impossible without having to keep dipping the cluch to stop it rocking back and forward, it also can be a bit jerky during normal driving too, the car in general is in good order, very recent leads, plugs, coil, cap, rotor and distributor too, so im guess ing it could be injectors maybe dirty, any other suggestions? i drove a friends today and his was a completely different animal, smooth pick up and couldnt feel the enigine at all when i revved it, mine feels very rough, could this be worn engine mounts causing that? thanks in advance for any help

[slideways]

clean the stepper motor,

[Andy chimaera]

checked, its spotless

[slideways]

worth getting the AFM checked

[Andy chimaera]

brand new uprated one from dulfords with a new map too, had that done hoping it would cure the problem, sorry, i forgot to mention that, not a bad job actually, 35 more hp from it with uprated cams as well

[The real Apache]

Get your wallet out sounds like an air leak but could be a worn cam, you really need to get it to a TVR guru

[slideways]

if its had all that, i would agree check for leaks, what cam did you get? Also have you thought of taking it back to where you had the work done? I would expect it to run perfectly after shelling out for all that

Edited by slideways on Monday 28th February 00:09

[Andy chimaera]

ive had the car checked and nothing reported, ill mention that next time im down there, but cams are brand new though

[The real Apache]

Was it lumpy before the cam change? getting 35 more ponies suggests a pretty hot cam which usually causes issues with lumpyness

[Andy chimaera]

stealth cams i think he said they were also had carbon trumets fitted too

[slideways]

only got one cam by the way, i hope they didn't charge you for two!

[Andy chimaera]

yeah its always been like it, i had the ignition upgrade done in the hope it would cure it, but while i was there, i got him to fit new cams too as i was advised they could be due for new ones, so i thought i'd treat myself to fancy ones lol, but its always run rough and very jerky

[slideways]

you keep saying Cams the engine only has one!
Also you say you have had a new map? do you mean a chip

Edited by slideways on Monday 28th February 00:16

[Andy chimaera]

yeah sorry lol, so if there is air leaks, where is that likely to be from?

[slideways]

inlet manifold / trumpet base / plenum area!
have you checked all the plugs too its a good indication of whats happening inside your engine?

[Andy chimaera]

well its had a number of visits to dulford and i moan about the problem from time to time, they dont seem to say much about it, so im guessing that as they have played with various bits in the engine you would think they would tell me if anything was noticed or not right, the engine in my opinion sems a bit noisy so i have asked in the past if there is any leaks and they say its running fine, thats why im wondering if it could be the injectors as im at a loss wit it really

[slideways]

Andy chimaera said:

well its had a number of visits to dulford and i moan about the problem from time to time, they dont seem to say much about it, so im guessing that as they have played with various bits in the engine you would think they would tell me if anything was noticed or not right, the engine in my opinion sems a bit noisy so i have asked in the past if there is any leaks and they say its running fine, thats why im wondering if it could be the injectors as im at a loss wit it really

after spending all that dosh on all those bits get a second opinion from another good indy if they find the fault take it up with dulfords,
makes me wonder if all those parts were actually needed of if you were seen as an easy touch?

[Andy chimaera]

well not really, i wanted more power anyway and also the ignition upgrade, its nothing they tried to sell to me and if you want to uprate any engine, do you not need replace the chip and other ingnition mods etc?? the problem is obviously relitivly basic and as most of the electrics and engine appears to be in good order, im a bit stuck. I live in bristol is does anyone know of any other TVR experts near me?

[slideways]

http://www.neilgarner.co.uk/

[Andy chimaera]

cool cheers, never knew they were there, ill give them a buzz tomorrow