After installing a new fuel pump, nothing changed. The P0172 came a lot of times. Looking for a possible solution, I found some information on EGR System. I had cleaned entire system when I rebuild the engine. But I suspected the EGR Controller since there is no voltage on their terminals. Yesterday...

I am having this P0172 code in my 95' Volvo 850 N/A. The short term fuel trim and long term fuel trim are varying from +14 to +25. The engine is new (1500 miles after rebuild), all vacuum hoses are new. I double, triple checked the vacuum for possible leaks. The two O2 sensors are new (bosh). The pr...