I am having similar problems. #2 and #3 injectors shut-off. After ruling out everything but the ECU, I eventually came to find out my ETM had a blown fuse. Replaced the fuse and the car started running normally again. Apparently these Volvo's go into some kind of safe mode where they shut cylinders ...

Well did not have another 10A fuse so did what any other hack would do and put a 15A one in there. Drove it around the block a few times and the 15A fuse has not blown yet. I have cleared the codes a few times and the P1620 keeps coming back but other than that I am clear. The check engine light is ...

Well now that I am narrowed down to the ETM, I discovered that the fuse for the ETM was blown. Replaced the fuse and crossed my fingers and everything ran fine for about a minute, then the fuse blew again. Not looking good for the ETM. I have also cleaned the ETM and while a little dirty it didn't ...

So I got a code reader. P1620 and P0507. 0507 is Idle Air Control System RPM higher than expected. No text for 1620 and conflicting info when searching internet. However, finding stuff about ETM (electronic throttle module) or MAF problems for these two codes and think I have a new problem statement ...

Thanks for the input. Starting to sound like the ECU is deliberately shutting cylinders down because it thinks something is wrong. Guess I need to figure out who I can borrow a code reader from and see what clues that reveals. Another piece of info that I have not shared yet is that we replaced all ...

Resistance reads 14.5 on all injectors. For the heck of it, I plugged the ECU back in and started it up and surprisingly it ran smoothly for a few minutes. I proceeded to clear the car off so I could give it a test drive. While I was doing this, the idle speed started cycling up and down and ...

So I like your sig "Its not your ECU" and I hope you are correct in my case. I am confused by your comment though. If I put the pulse testers on the injector plugs, I do not get pulses on #2 and #3 while I get them on the other 3. Isn't this indicative of a problem? I do successfully measure battery ...

I have a 2001 Volvo S60 (not turbo) that is only running on 3 cylinders. Compression 120PSI and spark on all cylinders. Used a pulse tester and found not getting an injector pulse for #2 and #3. Actually, the engine runs fine for the first few seconds after starting and then gets rough. Likewise, I ...