jamema Posted February 4, 2019 Share Posted February 4, 2019 Hi all, have a hesitation around 1800rpm ,had it in Ford and they can't find anything wrong, so I'll take matters into my own hands now, unplugged the air flow sensor went for a drive and it's a different car no hesitation and it seems to review more freely as well.plugged sensor back in and hesitation comes back, so had a geniune airflow sensor replaced and no change , had the loom inspected / tested no faults there. So why is it when it's unplugged it runs lovely and has a hesitation when plugged in. Please help Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted February 5, 2019 Share Posted February 5, 2019 The PCM just runs a standard 'safe' map with the EGR unplugged. To keep it safe, it overfuels rather than underfuelling which can cause engine damage. The proper map keeps fuelling as low as possible for fewer emissions. The overfuelling will make the engine run better, but it doesn't mean that it's the EGR at fault. Have you checked the EGR and air doser operation on live data with Forscan or similar? Quote Link to comment Share on other sites More sharing options...
isetta Posted February 5, 2019 Share Posted February 5, 2019 wasn't it about the MAF not the EGR Quote Link to comment Share on other sites More sharing options...
jamema Posted February 5, 2019 Author Share Posted February 5, 2019 Egr has been blanked and deleted out of ecu. Quote Link to comment Share on other sites More sharing options...
jamema Posted February 5, 2019 Author Share Posted February 5, 2019 Yes about maf Quote Link to comment Share on other sites More sharing options...
jamema Posted February 7, 2019 Author Share Posted February 7, 2019 Now getting a loud backfire from airfilter when hesitation starts. Quote Link to comment Share on other sites More sharing options...
DJ_Andy_M Posted February 8, 2019 Share Posted February 8, 2019 On 2/5/2019 at 4:33 PM, jamema said: Egr has been blanked and deleted out of ecu. Good luck passing your MOT. 1 Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted February 8, 2019 Share Posted February 8, 2019 On 2/5/2019 at 2:22 PM, isetta said: wasn't it about the MAF not the EGR Yes...and I fully meant MAF each time I wrote EGR in that post... My brain must have been frazzled that morning! 1 Quote Link to comment Share on other sites More sharing options...
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