AlexJames Posted June 5, 2008 Share Posted June 5, 2008 Hey guys, Just gone BPU, the engine is running kinda wierd, there is only what I can describe as thumps from the exhaust when it runs idle. It runs fine when the auto choke is kickin in, but then it drops to about 500rpm on idle... it doesnt sound like a miss fire cause I had on accleration that when I took the cats out and didnt change the sparks... lol I assumed it was down to the ECU having to re-compensate due to the lack of back pressure but after almost a week its still doing it... Did I change to the wrong sparks? I have Bosche (or however u spell it) sparks with at least a 0.7 gap. I have them the product code for the NGK sparks and they matched them with these... bad idea? Or is it the fact that I havent put the walbro fuel pump in yet? Quote Link to comment Share on other sites More sharing options...
Supradan Posted June 5, 2008 Share Posted June 5, 2008 Try an ECU reset (remove the ecu fuse for 30secs then replace) Quote Link to comment Share on other sites More sharing options...
AlexJames Posted June 5, 2008 Author Share Posted June 5, 2008 That the kick panel fuse box or engine one? Quote Link to comment Share on other sites More sharing options...
MisterSheen Posted June 5, 2008 Share Posted June 5, 2008 Engine..... Quote Link to comment Share on other sites More sharing options...
Whitesupraboy2 Posted June 5, 2008 Share Posted June 5, 2008 check your spark plugs with the below. http://www.mkivsupra.net/vbb/showthread.php?t=41927 Quote Link to comment Share on other sites More sharing options...
Wez Posted June 5, 2008 Share Posted June 5, 2008 If you now have a free flowing exhaust you are prob just hearing the normal idle, its been talked about on here in the past. Is it like a little miss every few revolutions? Homer might be able to describe it better than me as we talked about it before. Quote Link to comment Share on other sites More sharing options...
spidermonkey Posted June 5, 2008 Share Posted June 5, 2008 Mine tends to 'thump' a bit when at idle, i assumed this is natural Quote Link to comment Share on other sites More sharing options...
AlexJames Posted June 5, 2008 Author Share Posted June 5, 2008 If you now have a free flowing exhaust you are prob just hearing the normal idle, its been talked about on here in the past. Is it like a little miss every few revolutions? Homer might be able to describe it better than me as we talked about it before. Yeah thats what it sounds like.. although sometimes the idle drops below 500 rpms and sounds like its about to stall, sometimes at a junction if I hammer the clutch down fast and break.. it does stall.. which is embarassing lol Quote Link to comment Share on other sites More sharing options...
Wez Posted June 5, 2008 Share Posted June 5, 2008 Yeah thats what it sounds like.. although sometimes the idle drops below 500 rpms and sounds like its about to stall, sometimes at a junction if I hammer the clutch down fast and break.. it does stall.. which is embarassing lol That could be a sticky idle valve, but the thumping is normal. Quote Link to comment Share on other sites More sharing options...
AlexJames Posted June 5, 2008 Author Share Posted June 5, 2008 That could be a sticky idle valve, but the thumping is normal. .. and how does one such as oneself solve this? Quote Link to comment Share on other sites More sharing options...
Wez Posted June 5, 2008 Share Posted June 5, 2008 .. and how does one such as oneself solve this? Have a search on here about cleaning idle control valves and stalling etc, there is loads of info. Quote Link to comment Share on other sites More sharing options...
Homer Posted June 5, 2008 Share Posted June 5, 2008 Does it sound a bit like this? Thats perfectly normal (as Wez and I found out after trying to find a problem that didn't exist ) Quote Link to comment Share on other sites More sharing options...
AlexJames Posted June 5, 2008 Author Share Posted June 5, 2008 Does it sound a bit like this? Thats perfectly normal (as Wez and I found out after trying to find a problem that didn't exist ) That my friend sounds just like mine!... so maybe it is just the ICV...alot happier now! Quote Link to comment Share on other sites More sharing options...
Wez Posted June 5, 2008 Share Posted June 5, 2008 so maybe it is just the ICV Maybe, do a search on here for common issues with stalling etc Quote Link to comment Share on other sites More sharing options...
AlexJames Posted June 5, 2008 Author Share Posted June 5, 2008 Maybe, do a search on here for common issues with stalling etc ta, think I might Quote Link to comment Share on other sites More sharing options...
Chris and Alana Posted June 5, 2008 Share Posted June 5, 2008 I had problems with a dicky Fuel cut defender making the idle rough, like yours it was fine when the auto choke kept revs up but when they died down it was rough. If you have a fuel cut defender it may be worth removing it and seeing if it solves the problem. Quote Link to comment Share on other sites More sharing options...
TooColdToDrive Posted September 11, 2009 Share Posted September 11, 2009 Bump for Homer's video! That's EXACTLY what mine sounds like, and I'm very relieved! Quote Link to comment Share on other sites More sharing options...
Ian C Posted September 11, 2009 Share Posted September 11, 2009 Yeah thats what it sounds like.. although sometimes the idle drops below 500 rpms and sounds like its about to stall, sometimes at a junction if I hammer the clutch down fast and break.. it does stall.. which is embarassing lol Classic overfuelling symptoms. What have you monkeyed with? It's a j-spec right? So a vent-to-atmo BOV won't be causing this. Mucky O2 sensor possibly - check the ox1 pin in the diagnostics port for voltage when the car is warm idling, should bounce around .5v The occasional blap out the exhaust on idle is a feature of closed loop testing the limits. Relax, the mkIII used to do it too -Ian Quote Link to comment Share on other sites More sharing options...
nevins Posted September 11, 2009 Share Posted September 11, 2009 had the stalling problem on my n/a and it was the IAC, all it needed was a good clean out as it was coked up, now its fine Quote Link to comment Share on other sites More sharing options...
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