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The mkiv Supra Owners Club

car starting and boosting problem


TT Paul

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im having a run of bad luck of late and its getting me down now this!! had this car 3yrs never really had any major issues as most of us spent a few ££s i have been thinking of breaking it but i'm hoping some one has some awnsers as i've spent a few hrs each night what i've done so far..

 

replaced water temp switch(ebay)

cleaned idle valve

checked various pipes leaks etc..

car only started the boost prob today they just keep coming

 

spec syvecs,ttc,550cc injectors, full bpu

 

problems:(

 

car runs lean on cold start right off afr gauge once warm is then ok but idle can run high around 2000rpm when at lights or sitting in traffic seems to of started since temp switch replace one of ebay . guessing ecu temp switch on order OEM

 

when on WOT at 5000rpm car hesitates didn't see afr or boost as was watching revs could this be egv (need to lift of then foot down see what happens, have read this can point to egv) or related to temp switch

 

any help would be most greatfull and if i manage to fix this i'm more than happy to send some ££s to people who help as it would be some of your time posting on this thread

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Just to add. When the car starts from cold the ECU doesn't do adjustments to the fueling until it warms up so the fueling table on idle may need more fueling to stop you going lean until the car warms up then the ECU takes over and controls the fueling with AFR Target map

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