Hi. i am in turkey. my rx is 91 N/A but i think the engine is a 86 base engine because al parts are same as the s4 NA. I bought it 6 months ago and its all stock. there was unburnd fuel smell coming from EXHAUST so i went to mazda service (dealer). they tried to set the idle from idle screw, tps,and variable resistor but nothing has changed. They said there was no vacum. leak also the variable resistor is broken said they. any way ı took my car from service and the bouncing idle problem started after engine is warmed up. it bouncing between 500 and 800 and lots of time it DİE's. I know that i have leaking injectors because the car wont start after it dies and after unflooding (egi fuse method) it stars. Soo could leaking injector cause the idle problem?

 

cleaning bac hoses fixed the problem. it was blocked with dirt.

 

There shouldn't be dirt building up anywhere in the intake, its an indication of either a vacuum leak or your filter is compromised. Or did you mean the part where the coolant flows through? I removed mine. Anyway, if it was the airway that was clogged you should check for intake leaks with one of these and promptly seal them: http://www.boostpro.net/prodtester.html

 

sory. yes ı mean the hose which flows inside coolant also it vas droping replaced and it and cleaned the termo wax ( ı hope ım not mistaken this time). these solved my boucing. but yesterday i tried setting my tps according to a dmm checking the resistans when ı set it to 1 ohm its start bouncing around b/t 1000 and 1500. it must be vacum leak as speed of life mentiond. because when connected to a exhaust snifler, values showed too much o2.