Throttle Body

[Brown93]

Hello
My little 1.2 is struggling these days and has a minor misfire. When you put your foot on the throttle it hesitates badly then picks up in a sluggish manor. I think i will start with the throttle body and clean that. Has anybody ever done one, are they a pig to do and is there anything I need to watch out for. Help would be greatly appreciated.
Cheers Dan

[sassnowwolf]

I've got a 1.0 and had a similar problem, also couldn't get over 60 on the motorways! Disconnect the pipe linking your air box to the throttle body. There are a few silver circlips that pop off. If the engine is similar, the throttle body cover should be a black plastic, and in the centre top of your engine bay, on top of this there should be 3 star shaped bolts which need removing, i used a socket kit and it was simple! Pull this off and voila! there is your throttle body!

The throttle body should be closed, a simple way to open it is to either move a small plastic half wheel connected to a wire to the right, or get someone to lightly rev the engine, and the body should open.

Spray some carb cleaner all around the body and down inside it. I used a whole can as mine was full of oil. Leave it for 20-30 mins to do it's business and break down the poo, then astart the engine, mine took a while to start and needed revving slightly as it wouldn't actually start at first. I noticed it took a few times and steady revs, don't be alarmed if you see a small amount of smoke or steam, this is just the cleaner being evaporated!

Ever since i did this my cars run great, i actually did it in 3 or 4 goes and left the car for half a day, seems to have completely cleaned out all the gunk in there. Hope this helps.

[Brown93]

good advice mate my plan is to remove the hole thing then scrub the bitch with brake cleaner sadly i need the car for monday and the great british weather jumped in and stopped me from doing this today. I know on the 12v corsas and the newer ones the throttle body is a common fault so good place to start

[sassnowwolf]

No worries man, this funked up my corsa for ages, checked spark plugs, crank sensor etc...Finally found out it was this! Yeah i used brake cleaner from my local vauxhall garage they charged me 2.50 a can which is a bargain.

[Brown93]

ahh well lmao i pinched mine from graft as i work part time at a garage gonna have a good go at it tomorrow because apart form out else its gonna cause me a seriour car accident eventually due to the constant hesitation

[sassnowwolf]

Give it a go man, it might be your idle control valve, which should be if it's the same as mine, just in front of your throttle body. It can unclip/ unscrew and is supposedly (once broken) unfixable and very expensive to replace. However it can be cleaned. Search for corsa b cleaning idle control valve and theres a few tutorials

[Brown93]

well might as well clean it up while i am on for piece of mind