1997 4.6 runs rough

Demondog2007

New Member
May 28, 2019
1
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49
Pennsylvania
1997 mustang gt replaced fuelpump due to no pressure at rail and wouldn’t start i have pressure now but it starts really hard cranks over and if i give it press accelerator pedal it will start and barely stay running but missing really bad and breaking up more i give it gas it does run a little better but barely stays running without constant acceleration at idle i replaced all plugs and wires and still not running correctly anything else i can check
Thanks
 
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wmburns

SN Certified Technician
Aug 14, 2009
5,810
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Houston Texas
Do you have an ODB2 scanner? If so, it might make short work of your problem.

Otherwise start by checking:
  • Double check that the intake vacuum reference line is connected and leak free.
  • look for a vacuum leak between the MAF and throttle body.
  • Double check that all electrical connectors have been re-connected especially the IAC, TPS and the CAM sensor.
  • Check to see if the IAT and ECT sensors are sending "reasonable" values.
ForScan ODB2 scanner w ELM327 USB

1996+ Crank with no start check list
 
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