I have a 93 mercury topaz that stalls while driving
I have a 93 mercury topaz 4cyl 2.3L that stalls while driving i have replaced the ecu, fuel filter, spark plugs and wires, and distributor cap and rotor, the fuel pump, fuel pump strainer, fuel pump sending unit and fuel filter,i replaced the cam sensor and the car sill stalls and the check engine light is off and as far as i can tell the car is getting a good ground. What else can cause this issue?
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You engine needs three basic things to operate correctly Air,Fuel and ignition.Lets start with Air.check the air filter to see if it is dirty if so, replace filter and see if that solves the problem. Fuel.replace the fuel filter see if that solves the problem.Ignition. this gets complicated fast.Start with spark plugs,then spark plug wires, distributor cap and rotor( if equipped).newer vehicles have coil packs and are computer controlled. A service professional is probably needed at this point.
Hope this helps.
You've already eliminated the spark plug & wireset, distributor cap & rotor. Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.
Components checked/replaced during a tune-up are: air filter motor oil motor oil filter breather filter fuel filter(s) fuel strainer PCV valve EGR valve spark plugs spark plug wires ECM or distributor cap & rotor cabin air filter transmission oil filter transmission oil engine coolant check all vacuum hoses and lines
Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:
Priority Action Part Type -- Cause 1 Inspect Battery -- Battery Discharged or Faulty. 2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable. 3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned. 3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter. 5 Inspect Ignition Coil -- Faulty Ignition Coil. 6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s). 7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s). 8 Inspect Starter -- Starter Motor Faulty. 9 Inspect Fuel Pump -- Low Fuel Pressure. 10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch. 11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay. 12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator. 13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch. 14 Inspect Starter Drive -- Faulty Starter Drive. 15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors. 16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat. 17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC. 18 Inspect Fuel Tank -- Fuel Tank Empty. 19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke. 20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.
check for vacuum leaks,especially at fuel control valves,intake manifold.locate T P [throttle position]Sensor,on intake,opposite throttle lever.check wiring connector,spray sensor with WD 40 or CRC,if a change is noted,replace T P S.
the distributor is held by a clamp bolted to the block where the 'stem' enters the block.remove cap and mark position of rotor to ensure proper ignition timing upon re-assembly,note firing order of plugs.if a 'no spark condition exists,check 'pick-up module 'bolted to the side of distributor,below cap,a hex head 'special tool' is available to remove module w/ distributor in place. these modules are only rated for 50K miles.