I have a Fiat Bravo 1.8 HLX N reg 1996 only done 38000,the car has always been ran on normal 95 ron texaco unleaded,and the last 3 months or so the engine has started pinking (pinging) it's been to a local garage who's had it on a bosch kts diagnostic computer and found no errors or faults,the only thing out of spec was we took the car for a drive with the KTS connected and went hard through each gear ie about 5-5500 rpm's and he noticed the injector pulses were only 11ms for which he said should be 14ms min and more like around 18,i've been told since from other people that it's just a red herring with injector pulses as they constantly change? i did however a few days ago try texaco super unleaded and the pinking vanished,what's the reason for it not liking normal unleaded anymore? it's not carbon,it's had a treatment of ecotek's powerboost foam,hardly nothing came out the exhaust,it's had treatments of redex and stp complete fuel system cleaner,but it just won't run on unleaded anymore.all sensors have been checked,he said ignition timing can't be adjusted because the ECU controls ignition and air/fuel mixture ratios,i changed plugs a couple of weeks ago to no avail,then decided to change plugs again but for champion instead of NGK and noticed small yellow deposits on the plugs ceramic insulator,does this indicate anything?
- posted
20 years ago