ScramCannon Posted April 21, 2016 Share Posted April 21, 2016 Hi guys, As part of the general work on my project GC8 (thread below) - I'm trying to resolve an issue the car seems to have at idle. Essentially, it runs beautifully from cold, and when driven (any throttle application improves the situation). However when warmed up, the idle will drop to the point when it's struggling to run. This can manifest as the car stalling when the clutch is depressed during driving. As a test I've tried unplugging the MAF, this makes things worse. No check engine light is shown. To complicate matters as you might see from the build thread, the chassis is a phase 1, the engine/harness/dash/etc is later model (V6) STI. To me it seems like a sensor issue of some sort, possible air temp? I'm still trying to work my way around EJ20s. Any help gratefully received! Adam Quote Link to comment Share on other sites More sharing options...
stants Posted April 21, 2016 Share Posted April 21, 2016 Does it still run when unplugging the maf? Not very scientific but if it stalls it's good, Proper way is to test it with a multi meter, Could be one of many things, iacv maf throttle sensor, map sensor split hose etc, I'd start with the cheap options checking for leaks then move onto looking at the rest of it, Is the fueling correct ? From cold they have an auto choke, maybe when warm it's not getting the right mix ? Sent from my SM-G930F using Tapatalk Quote Link to comment Share on other sites More sharing options...
ScramCannon Posted April 21, 2016 Author Share Posted April 21, 2016 It still runs with the MAF unplugged - but (even) more lumpy. I'll try cleaning the IACV, this looks like a simple first job. To answer your other question, idle is high and the exhaust smells super-rich from cold. Cheers! Quote Link to comment Share on other sites More sharing options...
stants Posted April 21, 2016 Share Posted April 21, 2016 Standard on the cold idle & richness once warm should drop to about 750-800rpm What colour label have you on the maf ? May be worth seeing if you can borrow one of the same type to test, I'd hedge a bet it's that on its way out, Sent from my SM-G930F using Tapatalk Quote Link to comment Share on other sites More sharing options...
ScramCannon Posted April 21, 2016 Author Share Posted April 21, 2016 Would appear to be label-less! :- The car did have a new (second hand however) MAF fitted before it came off the road, but this was 3 years ago - and I don't know the provenance of the one fitted. Cheers, Quote Link to comment Share on other sites More sharing options...
stants Posted April 21, 2016 Share Posted April 21, 2016 Drop in one! Whoop saves you about 130 on the cost Sent from my SM-G930F using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
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