March 2020

MARCH 2020 AFTERMARKET 29 EYEBROW www.aftermarketonline.net comm a oil dr citi Ex cial engin er in valve into tun ng oppor e and gene ge a the lar ity to sell a t et tor mark ar owing nd gr echnically a place. dvanced ste Goods avy He • omme C Light • arsC • es Motorbik • t mark arge t ermP • anvAd ade tes stripped thr mina duces time to change o tion a e touch oper eplaces stan anently r sage t s il ain valve d oil dr dar ehicles ehicles e V ehicles V ehicles cial V r Eli • eR • On • systems availa Custom valve • Engine distrib • al V Agricultur • Servic ublic P • Opt • Gua • No • No • ional Hose End access oof ak pr anteed le r messy hands or clothes e contact with hot o mor Sh- aight and L tr ories (S il available t via onlin tomer suppor ble o pr s, Adblue tank s for utors & OEMs ta e technical da s and fuel pane tank ape) terial POS ma • cellent cus Ex • o Le T arn more please cont 503 650 act Adria adria t t n Sco n@dksi.com . www oil d ez rain.co ® m 01664 the HP pump, rail limit valves, and injectors, as well as volume and pressure regulation devices. Always isolate various components and conduct a blind or proof test before suspecting the pump. They rarely fail, unless run dry or have contaminated fuel. The PCM requires camshaft position data to sync the injectors and crank position once running. If recent belt replacement or engine repairs have been carried out, add this to your list. To check the injector sync against cam and crank position is a bit technical. To perform you will require a scope and current clamp. Quite often the serial data identifies the incorrect timing sensor for position error. This is due to the PCM looking at the camshaft first. Slow rotation speed may be due to a faulty or incorrect battery, so check charge and health status with a suitable conductance tester. Yuasa have a fantastic free online training academy. Next check relative compression. This is a simple cylinder balance check but when compared with current and rotation calculation will accurately predict correct compression. Identify A blocked exhaust or failed open EGR will prevent the correct combustion properties. Exhaust back pressure can easily be proven from the map and DPF pressure sensors. Plotting them with a scope will quickly identify intake or exhaust restrictions. The maximum DPF sensor value cranking or at idle should be 0.5-1.25 volts, 100mbar- Below: Pressure differential (suction) priming test 1.5psi. Injector type, solenoid or piezo faults will normally be identified within serial data. A single faulty injector circuit will normally shut down all fuel delivery. It is also worth noting that if a minimum rail pressure is not reached, the injectors will not be activated. So back to priming. Leaks, faulty rail sensors will all contribute to a non-start. If you are looking for more information, visit www.ads- global.co.uk for courses and dates, and Autoinform events.