Andreasq Posted June 29, 2023 Report Share Posted June 29, 2023 Hi, I have a problem with rough idle on my rb25. I use E85 pumpgas. I drive without engine idler it was broken when I got the engine so I run without it. Recently cleaned my injectors, fuel filter and new spark plug. The wiring harness is also new, can't find any problems with a vacuum leak either. I drive kelford cams 262/262 without vvt. The problem is the idle on around 850rpm and 2500 even throttle. Do someone have any idea? I will post a logfile later. Greetings Andreas Quote Link to comment Share on other sites More sharing options...
Andreasq Posted June 29, 2023 Author Report Share Posted June 29, 2023 jumpy idle.llg Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 30, 2023 Report Share Posted June 30, 2023 Your throttle position shows 0% when it is idling at 900 and 2.9% when it is idling at 2500. So likely a sticky throttle cable, weak return spring, no cable free play or some issue at the pedal. Quote Link to comment Share on other sites More sharing options...
Andreasq Posted June 30, 2023 Author Report Share Posted June 30, 2023 I will have a look tomorrow, thanks! Quote Link to comment Share on other sites More sharing options...
Andreasq Posted July 29, 2023 Author Report Share Posted July 29, 2023 Hello, sorry for slow replay. I did check the cable and no problem, the idle is still "coughing" maybe the problem I get for not running av IACV. Greetings Andreas Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 29, 2023 Report Share Posted July 29, 2023 Having no idle valve is not going to cause the throttle to stick partially open. The TPS shows 0% at idle in some places and 2.5% in others, so something is preventing the throttle from closing reliably. Quote Link to comment Share on other sites More sharing options...
Andreasq Posted July 30, 2023 Author Report Share Posted July 30, 2023 I was holding the throttle at 2500rpm, I did some checks in the tune and it running well leen and som other stuff, so a retune is the way Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 30, 2023 Report Share Posted July 30, 2023 On 6/30/2023 at 7:23 AM, Andreasq said: The problem is the idle on around 850rpm and 2500 even throttle. So what does this comment mean? I assumed you were saying it was idling at 2500? Quote Link to comment Share on other sites More sharing options...
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