Trouble at mill
 

Following a full service on the 996R I was looking forward to getting some miles under the new Corsas and went off on a jaunt with Webby to Worthing on one of the hottest days of the summer a couple of weeks ago. All went well until we got to the town and in the stop-start run through to the seafront the engine soon got up to 115C with both fans going furiously – the enclosed fairing always run the engines hot in traffic. Coming back out of the town the engine started to lose power – almost as if it was cutting out on one cylinder and it was a struggle to keep her going at traffic lights. Out onto the open road and although the temperature dropped the problem persisted – you would get up 7000rpm and then the engine would slowly lose power until the revs dropped back down to 4-5000 – open the throttle made it worse, then all of a sudden full power would cut in and wheeeeeh ….

After a while the problem disappeared and didn’t come back until the engine got hot again some days later. Over the last week the problem has been there almost constantly so I spoke to Snells who managed to free up Carl for a couple of hours to look at it. Prior to going I armed myself with a new ECU just in case courtesy of the kind and generous Andy Banes (andyb) who sent me three to try – thanks Andy :)

Well, the problem is now solved. Any idea what it was? A prize for nearest the right answer ..... :eureka:

A failed sensor?

Good try TP - not correct :P

Blocked fuel breather ?

Nope - not even close :alien:

Loose connection?

No - nothing like that :)

All the clues are in the intro .....

[Edited on 6-7-2005 by Henners]

spark plug

The ECU?

the rider ???? ;)

Fuel filter

no water in the rad - dickie water pump?

[Edited on 6-7-2005 by Flanks]

Thermostat not opening properly leading to overheating leading to intermittent sensor operation????

My 998 runs at this temp in traffic but no loss of power just a hot bum! is this a problem ? should I be looking to correct it?

Battery?

Quite normal really.

Regulator.

Thanks:eureka:

Vapour lock?

Plugs/Coils?

Something expanding

AIR INTAKE LEAK

Flour in the intakes?


Ray

[Edited on 6-7-2005 by Ray]

loose battery terminal

you had a 999 on loan for a while;)

sneaks off quietly

Well - sorry to say none of you are even close - especially Dibs :P

Think laterally ....... :D

You spilt some yellow paint on it?

Slipper clutch (although I have no idea why!!!):lol:

Glue on the twist grip had gone un sticky with the heat so it was slowly rotating around on the grip and closing the throttle.

or loose throttle cable

that pollishing cloth you couldn't find turned up in your air intake

.... not that laterally :lol:

It's to do with the fans and the heat ....

[Edited on 6-7-2005 by Henners]

fans blowing hot air into air intakes

Fans were fitted the wrong way round, or spinning the wrong way round?

[Edited on 6-7-2005 by Flanks]

Fans blowing so hard they were causing a vaccuum around the airbox and actually sucking air out of the engine.

fan blades broken, not shifting enough air, and binding causing a massive current drain resulting in the electrical system being overworked blah blah blah...

Fans were yellow and therefore too slow?

[Edited on 6-7-2005 by TP]

:lol: trouble maker!

Have the fans cut through a wire of some sort?????

Something to do with the temp sensor? Coming loose or something?

Flanks and Twinfan ...
 

... get together you're alost there :smug:

Air temp sensor came loose, and was reading the engine as cooler, so the fan was not working or fan was blowing cold air onto sensor?

[Edited on 6-7-2005 by Flanks]