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Serious Problem! Well I Think Anyway


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Evening all,

Ok so i decided to give my engine bay a good clean down yesterday and decided while i was at it to clean the throttle body, it was full of black oily dried in gunk and sorta needed it badly.

I used nothing but a dry cloth, no cleaning products/water etc.

While i was at it, i gave the air filter a quick blast of the hoover, when done i replaced the filter housing, cold air feed and basically put it all back together the way it was in the first place.

Today, i notice the car is a little more responsive and a tad bit better with the petrol! happy days...... so you would think?

Went out to get the paper about an hour ago and when i come out from the shop the car starts up as normal, but then the 'check engine' light and the 'trc' light starts flashing like crazy, and i notice the car is actually alot worse then it originally was!

Its like its chugging, struggling to meet the idle revs, or firing on 5 cylinders?

Ive no idea whats caused the problem, im just hoping it wasnt something ive done, and tbh with the cost of bringing it to a lexus dealer im praying it can be detected or i can be pointed in the right direction as to what i should be looking for?

My mate has a diagnostics machine thingy but wont get a chance to get to me with it for a couple of days so im really stuck!

Please tell me someone here my be able to help :tomato:

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Just check EVERY connection plug, cant see it being anything but a dodgy connection. If I recall there is one right under the throttle body which allways seems to be covered in oil, that would be the one I would be looking at first..

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Cheers dude, had a look over it today and it turned out to be a dodgy coil pack, just happens i have another is200 in the garden for breaking so just changed them over and shes now running like a dream!

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  • 3 weeks later...

i am in need of 3 coil packs dont suppose you fancy selling any if you have some spare mine gave up today could you please message me or email me on

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  • 2 weeks later...

my is200 engine missfires, didnt notice the rad leaked while going along, didnt notice water temp go stone cold, engine light and trc light started flashin, pulled over, bonnet up, black / dark smoke was cominf from somewhere? back of engine? ATF from rad? new rad in today, she misssfires like hell, engine light still on. you reckon coil pack? valve? sensor? ( engine was pretty hot)

many thanks


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