Replaced one fuel injector and you could see fuel spray but now it's barely getting spray. Car starts but runs rough and lacks power. Fuel filter replaced and I get spark as it runs. Also new everything for electrical plugs, wires ect. ECM or fuel pump? Disassembled fuel regulater ind it seems ok. Removed injector and there seemed to be no pressure. can a pump work and not work at the same time or output low pressure.
Year/make/model/engine size??? Do a fuel pressure test to see what the pressure is. Low/no pressure= poor spray
Testimonial: "Cant seem to do a fuel pressure test as the rental pressure testers don't have the right fittings. When I removed the injectors I was expecting a little splash from the pressure but there was none. Installed one new injector and it sprayed fine engine ran for a while and now its running rough again. Checked the injector and there is barely any spray. Lean fuel mixture from ecm or low pressure. Engine reves up to high speed in idle and low power in drive. Engine seems to run fine after working on it but then it craps out again shortly there after. Intermittent power loss/lean fuel mix. Rev the engine up and it sometimes kicks in to normal but then after a while it goes bad again. Debating on faulty ECM or intermittent fuel pump where it sometimes gives good pressure and then not."
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