97 two door 4wd 5.7L- Replaced fuel pump and have correct fuel pressure. Did a continuity test on all grounds I could find. Everything that I found to check is testing good. Truck cranks up then idles down and dies immediately. Kinda stumped! Appreciate any help!
Need some help troubleshooting
- Thread starter Slade95
- Start date
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MassHoe04
Full Access Member
Everything is good on battery and alternator side of things?
Sometimes the electrical system can act weird if not getting proper power to the computer controlling the engine. Just looking to see if something can be ruled out as having any involvement with your issue...
Sometimes the electrical system can act weird if not getting proper power to the computer controlling the engine. Just looking to see if something can be ruled out as having any involvement with your issue...
Any work other than the fuel pump done lately, and was that changed due to this problem? How long has it been going on? Can you share more history? Miles?
Does it have a fuel filter and, if so, when was it last changed?
Can you keep it running using the accelerator?
If it runs for more than a second or two, but dies when it warms up and gets to commanded idle, look for a vacuum leak. With a scanner check short-fuel trims at idle (you may have to hold the rpms with the pedal, if you can), then at 1500 rpm. Compare and post them up.
Does it have a fuel filter and, if so, when was it last changed?
Can you keep it running using the accelerator?
If it runs for more than a second or two, but dies when it warms up and gets to commanded idle, look for a vacuum leak. With a scanner check short-fuel trims at idle (you may have to hold the rpms with the pedal, if you can), then at 1500 rpm. Compare and post them up.
Clean the Idle Air Control, may be a replace.
Do you have a factory tach? Does RPM bounce around occasionally? say 50-150 RPM when cruising along. That would point to failing CPS.
I suggest setting some recording of selected PIDS to narrow your searches for a solution. I don't know what you have for tools/equpment, or vehicle history. Please post more info for more help.
Do you have a factory tach? Does RPM bounce around occasionally? say 50-150 RPM when cruising along. That would point to failing CPS.
I suggest setting some recording of selected PIDS to narrow your searches for a solution. I don't know what you have for tools/equpment, or vehicle history. Please post more info for more help.
Correct fuel pressure when? Why was pump replaced and was filter done at same time? Same problem before the pump replacement? Fuel pressure during the whole start run process? Brand of fuel pump?
By the way, welcome to the forum. I hope you are not only here for help and will remain a contributing member.
By the way, welcome to the forum. I hope you are not only here for help and will remain a contributing member.
Fuel pump replaced because truck sat for a long time and the pump was no good. Truck would not start at all with old fuel pump. Yes pressure at all times. even with fuel pump jumped out It’ll die.
How would I correct that?
It won’t stay running long enough to drive. It’ll crank idle down an run 3 seconds or less then die down.
Fuel filter changed with fuel pump. Have fuel pressure at fuel rail. Any gas given with accelerator it dies immediately.
I would suspect that Idle Air Control Valve, like @exp500 said. Remove and inspect inside the throttle body port where the valve pintle would move. Should be a clean smooth surface that is tapered. Can be clean with carb cleaner and a small brush. I would inspect the pintle shaft/spring area for filth and replace if needed or at least attempt to clean. Is there any CEL's?
Do you have a Spark tester? Test at Dist and at coil. Report findings.Should be bright white and hit flawlessly every time,no skipped sparks.
It sounds like truck sat 6 months or more so Distributor cap is now suspect. Use Delco/Delphi/United DCR -820x only.
If no spark, I will recommend other tests.
It sounds like truck sat 6 months or more so Distributor cap is now suspect. Use Delco/Delphi/United DCR -820x only.
If no spark, I will recommend other tests.
east302
Full Access Member
Is the Security light staying on or blinking? Normal operation is for it to come on and go off within a few seconds of starting.
