Can anyone help with my misfiring bug eye sti ?

[Domo2106]

I have already mentioned this In a previous thread I posted in the general scooby chat section thanks to everyone that replyed so far

I have a 2002 bug eye sti I have only had it a day when I test drove it prior to buying it it was fine drove spot on but the next morning before I picked it up the bloke rang me saying it had devoloped a slight misfire basicly it ticks over fine and drives fine but when u plant your foot to the floor u get more of what I would call a hesitation rather than a misfire it seems to bog down but than clears and pulls and boosts as normal I did drive through a large puddle on the test drive could this have caused it ?
Basically I took it to a garage earlier they stood there for a hour and a half looking didn't to move any parts or even plug it in to a diagnostic machine they than said it was either the coil packs the maf sensor or a O2 sensor and told me there was no way to test them and the only way to see it they were the cause was to fit new ones and see if it solves the problem they then relived me of £75 for there time which I thought was a joke considering they had done nothing !!!

Does and yow know of a honest reliable mechanic that knows there way around a scooby I just want it fixed and the fault diagnosed preferably without changing every sensor on the engine as the idiots I took it to earlier wanted to do !! Or does anyone have a spare set of coil packs maf sensor and O2 sensor I can swap over for mine to see if it cures it I'm happy to pay if anyone can helpi

[Red Baron]

Sounds like coil pack or plugs, I've seen the same on other cars, my wifes focus would hesitate when you floored and then would pick up normally. Turned out the plugs had never been changed and had a gap you could drive a bus through which had caused the coil pack to break down.

Shane

[Domo2106]

I was going to fit a set of plugs tomorrow thought I'd start with the cheapest option first and then go from there does anyone know the correct Gap the plugs should be set at ?

[kartingsteve]

I have a misfire myself and will start with plugs as I think the last time there were changed was about 4 or 5 years ago, a second set would not hurt in 10 years

[scooby doo]

Boost leak??? Have you got got a gauge fitted. I'd go with plugs, then clean maff, check for any leaks then buy 2 second hand coils and start by changing a bank at a time

[Domo2106]

Yeah it has a boost gauge fitted it's boosting at 20psi and seems it hold boost ok it splutters up to about 4.5k revs then clears I've just picked up a set of NFL irridium plugs does anyone know if they are pre gapped or if I need to set them ?

[Lucky]

Brent or luke at SMD (Southern Motor Developments) 01273 611746. They are in Newhaven so near you. They look after a fair few on here and looked after my hawk and wagon.

[Domo2106]

Cheers will give em a bell

[Domo2106]

I just noticed The Engine management light wasn't lighting up when u turn the ignition on so I plugged it in to my code reader and it's coming up misfire on cylinder 1 could this still be the plugs or is it more likely to me a coil pack ?

[Red Baron]

Do the plugs now you have them, if they don't fix it try the coil packs. If you dont have a record of the plugs being changed then they're probably due anyway.

[drakesnow]

Pmed you a few things

[scooby doo]

Get them plugs dropped in and then re look at it could be really simple like a plug

[Domo2106]

Put the plugs in and wow what a difference defo the fastest scoob I've had just got back from taking it for a test drive it still misfires slightly in 6th but that's it

[Domo2106]

I'm havin a absolute nightmare with this bloody thing just popped down the shop and I've done the passenger side front drive shaft the wheel keeps locking up another thing I've gotta fix