hello people

I have aproblem with my daily runner which is a punto gt turbo not an RS i know, but hope you dont mind me askin for help as you all seem to know what you are talking about!

i recently fitted a SEB0 chip to the car and its been absolutely wicked - power when you need it, pulling like a turbo up the revs nicely, general drivability etc etc....

the other day, i was on a wet road pulling away hard - one wheel spun up, and before i realised what was going on i was up near rev limiter territory....only in SEB chip world, i dont actually know where that is! I know its raised slightly, but after i accidently reached what seemed to be the mechanical rev limit of the engine, it has not been the same.....

immediately after it wouldnt accelerate properly on boost, although it was boosting fine according to the gauge. I left it over night, filled up with fuel and it seemed like 3rd gear onwards under about 3/4 to full load it pinks initially, then pulls but not as hard as it should, then holds back a bit then goes then holds back etc.

My mixture gauge says its nicely rich, although its only narrowband, and it does react quickly when you alter the throttle etc, so if it were fuel related, surely it would show up on the gauge? eg: fuel pump not coping with 1.2 bar boost anymore....

so what causes pinking or detonation:

hot plug tips/cylinder temps mainly caused by weak fuel mixture or icorrect ignition timing
spark plug rating too hot
high ACT's
high compression or carbon build up in cylinders
very heavy load eg: going uphill, full throttle, wrong gear
water in cylinders (head gasket failure)

But how would high revs, that are presumably safe to hit once in a while due to the rev limiter being raised, cause this pinking and lack of power? By the way the chip i ahve fitted has been used in thousands of other puntos, and is written by a good italian tuning fella i have heard anyways, and although the chip is effectively a stage 1 generic type chip, its not like superchip as its meant to be by this italian chap who knows his potatoes!

the engine runs fine as far as we have checked it so far - the boost has been turned down a little to see if that helps, oil level, condition and pressure is good, coolant is good ie: not contaminated or low like its leaking into cylinders, block tested for head gasket = good on tests lasting 20 mins per test. Cat test shows MOT perfect on all gasses. Its also running only 8 HC's!! Plugs have been changed as a precaution and are the same NGK BCPR6ET's as before, so the heat rating surely cant be wrong all of a sudden?

I did think maybe leads and coil pack may be breaking down, but if this were the case, it shouldnt pink.

I doubt veyr much that its any kind of mechanical failure, but im not ruling it out completely - there are no knocking noises what so ever and the car drives as normal until you start to try and boost hard. It still goes pretty quick but although the boost is there it just doesnt pull like it did. Its also best to nip pinking/detonation problems in the bud before they cause real damage.

any help or ideas much appreciated - sorry for the essay!

Thanks

 

also forgot to mention that the management light does not come on while driving - i have yet to check to see if any codes have been stored, but the last time it stored codes the light comes up and stays on so i assume its all clear. Will check it tho on the computer tomorrow if i get chance

 

yo timbo hows it going what happened to your gti missed the turbo rush did you have you checked all the sensers and so ie
map senser to c if they is ant oil on it
the boost pipes incase its picking up oil from their or even the breather system is their any traces of oil in the inlet
has the ignition timing moved get your light on it and check
have you gapped the plugs right

 

hello gup cheers for your help matey

its MAF so no oil in that area but i like your thinking

its also dizzyless although it does have a crank sensor and a another kidna of pick up from the same place the distributor used to be when the engines were used in old uno turbos etc. - im not completely sure if its adjustable but i spose i best check it - been a bit lazy with it the last week or so as been busy with other things - always the same when you are a mechanic eh?!

plugs are pre-gapped as they are tripples altho i did put new ones in 2 days ago and checked the gaps which were ok.

i said to dave i think it might be a knock sensor, but he pointed out that it pinks momentarily, then it holds back - he thinks that the holding back is due to the knock sensor interrupting things - i really should check things out but i cant find the time - i cant do it at home cos parents and neighbours etc.

dave also said maybe fuel pump or pressure reg has got tired....i dunno....

 

whats your fuel filter like you may off sucked up some poop when giving it beans check the state off it and c from thier
could be fueling but it should do it all the time when on boost not intermitent
you might have a very tiny split in vac or boost pipe that opens up when giving it beans
the plugs are the right ones for the car as i was told i could fit platuim ones in my old series 1 and it pinked like it was in fashion lol

 

platinum plugs in a series 1? lol no wonder it pinked!

yeh need to stick a fuel filter in it will order one up in the morning - the vac lines - did think of small air leak - had a quick look over but really need to get it up in the air - always thought that other than the pipe leading into the turbo from the air flow meter, all the rest of the pipes are under pressure not vac so wouldnt cause and air leak inwards but will check its just getting the time now really

 

only be vacum on idle then under pressure when under load check the connections on your boost gauge to
off topic do you guys have a scanner at work need a car put on one for a good mate of saras

 

yeh we got a scanner mate but would have to work it around the boss cos if he sees you sticking it on etc then he is gonna wanna charge init should be ok if we do it one night after work

 

cool beans fella you guys found a house then lol
i have a fellas number who is proper clued up on the turbo side of things you can give him a call and he can set it up or check it out for you if you want or leave it with me for a bit pmsl ill sort it out for you

 

you are the detonation king tho lol!

how many times did i tell you not to set your ignition timing to factory after you chipped it and to stick to cossie plugs or whatever teh tuners recommend when you worked at my place lol!

and turn the fuel up too

you are as bad as me you old tart

 

oi that car run sweet as a nut when i was finished with it i did have to retard the ignition as the chip proper advanced the timing it was running when it was at your place and the fueling was spot on as my mate set it up for me never did run cozzie plugs only put standard ones in as you felt how lively it was a 13psi so never really needed them ask mr broadside on here about it hes the fella that bought it off me and he will vouch how sweet that gem was running lol better than your uno

 

lol ok



you touchy old tart lol!

 

seems ok now - putting it down to contaminated fuel as me n the missus filled up at the same garage on our way out in both cars a few nights ago, and she said that she had noticed hers was running like shit aswell

so thats good news!