Won't start,has spark, has fuel

SOURCE: Hello my 1991 cadillac deville won't go over

As per the problem, which you mentioned it indicates problem with fuel pump, the fuel pump is not holding the pressure.To pump gas from fuel tank to the engine there should be pressure.But if fuel pump is worn out, then this pressure will be low or in some cases there is no pressure at all.Replacing the fuel pump should help.----------- ----------------- But there few more possibilities for this problem too, other that fuel pump and fuel filter, it can be problem with sensors, the o2 sensor.Clogged catalytic converter, problem in transmission assembly.Transmission fluid very dirty or very low transmission fluid.Also get this checked and see.To check if catalytic converter is the issue, you can try this.Remove the o2 sensor , unplug the o2 sensor then rev the engine and see.If it goes up to 2000 to 3000 RPM then its catalytic converter issue. But if same problem like before is there, then get the fuel pump replaced, get the fuel pressure checked.It can be checked at any local garage.If the fuel pressure is checked fine then in that case get other possibilities related to transmission checked.----------------- This should help.Thanks.Helpmech.

SOURCE: 1990 deville, replaced ecm, fuel pump, filters,

I had same problem in my 90 deville. Drove myself crazy, I replaced the sending unit in the tank with a new fuel pump. I also had to replace the fuel pressure regulator, which sits behind the rail system. It worked for me.

SOURCE: Got fire, fuel pump and pressure good, but no

check fuses and relays, might have to check wire harness for injectors, you may have a break in the wire and have to reconnect it. check for voltage at injectors one at a time see if its all or one

SOURCE: on and off fuel pressure @ the fuel rail of a 1990

check pressure relief valve

sparksflyin

• 47 Answers
• Posted on Dec 06, 2009

SOURCE: 1999 devile. No spark, no injector pulse. What's

crank sensor is bad