Stalling at higher speeds. Volvo s60 2002 2.4T AWD. Park, restart and continue but same occurrence after a while. What could be the problem?
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a few possible causes come to mind a) fuel starvation - weak fuel pump, clogged pick up or filter etc b) system voltage issue (leading to low fuel pressure at speed or weak spark) c) weak spark - coils, plugs, wire harness to the coils d) fuel trim - things like temp sensor, MAF, MAP, O2 sensor etc that can shape the fuel mix. Did you scan for any stored OBD2 codes? I'd start by scanning for codes, checking system voltage under load (ie with the engine running throw on the head lights, heater blower rear defroster etc then see if the alternator keeps you over 13.5V). After that I'd try to collect some run time data on a drive cycle to see what is going on when it starts to wonk out...