Hey everyone hope to find help here. Here is my 1990 Volvo 760 Turbo with 220k miles! It is currently running rough. RPMS going back and forth around 500-600rpms and shaking like a misfire, I check the code and it’s showing only 1-1-3 fault in injector. I’ve replaced all injectors with brand new ones. I’ve also changed out Maf, o2, TPS, IAC, Fuel regulator, both fuel pumps along with fuel filter, I cleaned my throttle body as well I’ve read somewhere that it’s the CTS (coolant temperature sensor) but also see someone saying it’s cold start injector but can’t really find anything about it on the internet. Thought I’d make a post on here since Facebook and other threads weren’t giving me any leads

 

If it's running rough like a miss fire - What's the compression? Which cylinder is not firing at idle? (unplug injectors one at a time when idling and note the idle change - )

Do you have an air leak at the intake manifold gasket causing a lean condition in one cylinder? (use carb cleaner spraying at the manifold/head connection looking for an idle change)

And please stop simply replacing parts - as you have found out it gets expensive and frustrating when your $$ don't fix it.