Slow starts I have replaced the fuel pump twice, the fuel relay, the fuel filter and the regulator. I still have to turn the key on and wait for the relay to stop clicking before it will start.
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Then your fuel pump is not working, or your fuel filter is blocked. You will probably have to check your fuel pump circuit if you have no fuel pressure in the fuel rail, where the injectors sit. There is a fuse for the pump, usually in the under hood fuse/relay block. That is probably also where the fuel pump relay is located. You should hear or feel this relay click when the ignition key is cycled from off to on. Also, when the key is turned to on, you should hear the fuel pump in the gas tank turn on for about 2 seconds. This will put the pressure in the gas in the fuel rail, for starting the engine. If you don't hear the pump turn on for that 2 second period, it is probably a bad fuel pump. But know the fuse is good first.
Leaving the key on longer then two seconds does nothing ! When you first turn the key to on the PCM - engine computer will energize the fuel pump relay for 2 seconds ! If you want to turn the pump on for another 2 seconds you would need to turn the key off an then on again ! The only other way the PCM will energize the pump is while cranking the engine , if it sees an input from the crankshaft position sensor . Rather then just replace parts an making part stores rich , why not learn how to do proper diagnostics . Test the electrical circuits . What's the fuel pressure ? What does the mass air flow signal to the PCM look like ? Hooking up a scan tool an viewing engine sensor data etc.... Check the CCRM - constant control relay module . Google CCRM
SLOW DOWN THE FUEL PUMP WILL POWER UP BY ECM FOR 15TO20 SEC SO KEY OFF WAIT COUPLE OF MIN NOW HAVE SOME ONE DO KEY ON ONLY.YOU LISEN TO PUMP.IF NO PUMP NOISE. YOU NEED TO RECHECK YOUR WIRING THAT CAME WITH NEW PUMP IF WIRING IS GOOD RETEST BUT CHECK POWER AND GROUNG IF POWER AND GROUND ARE GOOD. BAD PUMP OR WIRING WRONG.RELAY BOX HAS RELAY AND FUSE FRONT OF TRUCK
Try checking the fuel pump relay see if it's carroded if it is then sand it, normally the fuel pump relay should come on first. also check that you battery terminals are clean. Be sure to test the pump to turn the key to the run postion first listen to see if the pump runs, if it dosen't then you need to fid out why, also have you changed the fuel filter? Just a thought even if the pump runs if the filter is plugged you may have a slow start condtion because of this.
I believe you have a fuel regulator weak or dirty injectors.
Try turning the key to the "on" position ( do not try and start) wait until fuel pump stops running (3-5 seconds or so ), turn the key off and immediatly repeat for 3 cycles. On the 4th key rotation, start the vehicle. Does it seem to start up faster?
If so, the regulator is weak, however, the fuel pump does have a check valve in it to prevent fuel from leaking back into the pump and maintain line pressure.
Try the diagnostic proceedure above first and we can go from there.
Good luck, let me know.
Regards,
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