All Things Mk5 > How to Guides / Troubleshooting

Problem with the S3, strange.. Help would be great!

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jonnyc:
Hey all..

Ok, so collected the car (private sale) and drove home.. Half way back I had a CEL flash up for 5 seconds, it did this twice then went away.. Now a bit of a description as to whats happening..

The car fires up fairly quickly (a little longer than usual, but about 3 cranks) but it runs terrible, on idle it has a very heavy misfire.. It will rev up but again with a big misfire and lots of pops from the exhaust etc..

I have a CEL on the dash but the codes are all relating to coolant which as far as I know the engine hasn't overheated.. Plenty of water in the engine and oil level is fine

3 codes stored..

Rear heater core temp sensor (G154) Sporadic 001- Upper limit exceeded

Coolant temperature sensor at radiator outlet (G83) Sporadic 001- Upper limit exceeded

Coolant temperature sensor at engine outlet Sporadic 001- Upper limit exceeded

So this is where it gets interesting..

I pulled the coil packs and swapped them all with coil packs I know are working from another 2.0T FSI car.. No difference made what so ever..

So then I thought it must be the plugs..

They all came out looking clean apart from cylinder 4, which is very wet with what smells like fuel..

I swapped the plugs too, still no difference, so now im running on plugs and coil packs from my other car which I know are all fine, and its made no difference..

Im trying to think what it is, seems that there is no spark/ignition on cylinder 4, but what could be causing this?

My only thoughts was something to do with the connector that plugs onto the coil pack??

Any help would be appreciated!!

Thanks

Jonny

snapey:
sh*t the bed, can you not check the line voltage to the plug and check it against the supply the other three plugs are receiving to make sure its arcing.

Might be worth going over all the connections with some contact cleaner to remove any dirt, water etc to make sure there are no shorts etc.

I'm not very clued up on car electrics by any means but 9 out of 10 electrical problems at work on the engines are down to sh*tty connections.

Is the car not under warranty?

Might be worth ringing the bloke or gal you brought it off to make sure he knows something you don't.

Luke

MAT ED30:
Take it for a spin and try do some logs to check all is doing what it should

jonnyc:

--- Quote from: snapey on July 18, 2009, 09:16:49 pm ---sh*t the bed, can you not check the line voltage to the plug and check it against the supply the other three plugs are receiving to make sure its arcing.

Might be worth going over all the connections with some contact cleaner to remove any dirt, water etc to make sure there are no shorts etc.

I'm not very clued up on car electrics by any means but 9 out of 10 electrical problems at work on the engines are down to sh*tty connections.

Is the car not under warranty?

Might be worth ringing the bloke or gal you brought it off to make sure he knows something you don't.

Luke


--- End quote ---

Good idea, yeah I thought initially that it was something a lot more serious in the engine but it seems like its electric, not that it makes it any better.. Just there a bitch to find the problem most of the time!

I haven't heard of anything like this before so trust it to be on my car!  :sad1:


--- Quote from: MAT ED30 on July 18, 2009, 09:18:16 pm ---Take it for a spin and try do some logs to check all is doing what it should

--- End quote ---

Need to do some logs of it when its on idle.. It hardly runs so driving it about at the min isnt really an option..  :confused:

SteveP:
I would have though a connection issue with the coil pack would throw an open circuit error TBH  :confused:

Could you try with the coil pack on cyl 4 disconnected to see if it does throw an error?

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