hesertating problem help PLEASE

[ibizaboy 0]

i posted on here a while ago saying that my car was doing something strange!!

basically it drives ok but then kinda hiccups!! it losses power(not as in battery power) and then it just comes back in with a thump! (kinda kangarooing if you go slowly)

it only used to do this the odd time when flooring it but now its doing it all the time!!

i have changed the fuel pump for a vr6 one, i have changed the spark plugs, fuel filter and cleaned the dizzy cap!! all of which havent worked

ps my car is a seat ibiza mk2 and i have done the conversion myself, engine is a golf 2.8 bored out to a 2.9 with gas flowed head and a airfilter.

if anyone has any ideas as to what could be causing this than please let me know

thanks liam

[ibizaboy 0]

oh should have said it doesnt do this when just reving the car it only does it under load!!

[dellert 0]

Pop the plugs out and inspect their condition. Spark plugs can tell you a lot about the engine.

[richievr 1]

check both the engine speed sensors..

cam and crank - they do play up sometimes and can cause hesitation and kangarooing problems

[Eat this 2]

try cleaning the throttle body

[ibizaboy 0]

will try all these tomorrow when i see my mate who is a mechanic!! after changing fuel pump etc he ran out of ideas so ill let him know these ones!!

thanks liam

[wakdog 0]

i reckon its the leads. Mine was doing exactly what your describing and it would go pop pop pop as the unburnt fuel ignites in the exhaust due to misfire.

Replaced the leads and plugs and its all good now.

[ibizaboy 0]

oh no ur kidding!!!!

my leads are brand new magnecor ones and cost £100

on the plus side i can try that easily by swaping my leads from my mates vr

[wakdog 0]

well if it is the magnecors they have lifetime warranty so ur ok there

[shail 0]

I had the same problem, which then turned into it stalling at idle. HT leads were fine (Magnecor - altough I did have a problem with one lead arcing a while ago which they replaced for free), as were the spark plugs. Had the throttle body cleaned and still the same problem. In the end I changed the mass air flow sensor and it did the trick. GSF do them for about £70.

[clarkie 1]

happened to me aswell. a wire had broke on the main loom. worth havin a look

[vr6turbo 27]

i had a loose connection on the main engine harness plug

it was an injector wire, took me ages to figure it out but the car runs fine now

[ibizaboy 0]

hmmm well this is gonna sound strange lol.

i was on my way to meet my mate with his vr and was passing a petty station and i had just below quarter of a tank left so thought id fill her up. having filled her up it drove fine!!!!

therefore i couldnt change any bits as it was driving fine and i wouldnt be able to tell!!

all the way from york to billing it was fine and then going round the 2nd to last roundabout it hesertaded again!!

after this it got progressivly worse till i filled up!! so i thinking it has got to be something with fuel but its not as if im letting it run out of petrol, it seems to start when i go below quarter of a tank!!

[wakdog 0]

lots of water and shit in the fuel tank maybe.....

mine seems to run like shit when it gets below the 7L indicator (red area). Im gonna get the tank cleaned at some point soon.