missthe1122
Member
- Joined
- Feb 16, 2011
- Location
- Long Island, New York
I know 740 turbo no start is an old much addressed topic so I apologize in advance. I believe I've tried all the advice that I could find on this forum and others before posting this. Anyway, I just bought a 1990 740 Volvo turbo wagon, LH 2.4. It ran great when I drove it home (about 27 miles). But the next day, while I was driving it just stalled. There was no indication of anything going wrong, it just stalled and then would not start. I checked the spark and it was present. I pulled a plug and no smell of gas. The timing belt looked good, but it wasn't very tense so I thought maybe it skipped a tooth or two. So I towed it home, charged the battery, replaced the timing belt, tensioner and water pump, spark plugs, ignition power stage module and crank position sensor. (I had the parts and planned to do all this anyway). There's a good spark, the engine cranks fine, but it wouldn't start. I Checked diagnostics and got 1-1-1. However, when I triggered the fuel injection test mode (plug inserted in pos. 2 and 3 presses of button), I heard relays click, but no fuel injector action. Per on-line advice, I replaced the RS relay and the fuel pump relay. I heard the fuel pump running with key turned to position 2. I verified plenty of fuel pressure on injection rail. I verified the grounds on intake manifold and valve cover to chassis. I measured 12V at the ballast resistor pack and each individual injector harness. It seems that the injectors aren't getting ground signals from the ECU. I was advised that I should replace the computer. I'm skeptical because the computer reports codes and also invokes the fuel injection diagnostics. I'm doubtful that a bad computer could do these things. Before I go ahead and buy a computer, is there anything I may have missed that could prevent the computer from sending ground to the injectors? Or, is there anything at all that I could be overlooking?