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Ron, ASE Certified Technician
Category: Mercury
Satisfied Customers: 36075
Experience:  ASE Certs and Ford Certs
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86 mercury topaz: dies..a week and started doing the same thing..relay

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86 mercury topaz will start but dies right away, changed fuel pump and it worked for a week and started doing the same thing again. also, checked the relay for the pump.



Thank you for asking your question on JustAnswer.


What size engine?


Can you here the fuel pump cycle?


Do you have spark when it dies?


Customer: replied 8 years ago.
it is a 2.3L engine
yes i hear the fuel pump go on for a second when u turn the key
after that it stops
i checked the fuel line right where it goes into the throttle body
and fuel comes out of that line
so it must be getting there.
as far as if it has spark when it dies im not sure how i would determine that.
also the fuel filter was replaced months ago along with new plugs wire cap and rotor, routine tune up
thank you



Thank you for asking your question on JustAnswer.


If you have saprk then the common problem that you are likely having is a bad ignition modual and or a dist stator causing the engine to loose spark.


Check for battery voltage to the Red (R) wire of the fuel injector with the ignition switch in the Run position.

Check for 5.0 volts on the Orange/White (O/W) wire of the Throttle Position sensor or Exhaust Gas Recirculation Valve Position sensor with the key in the Run position.

If battery power is present to the fuel injector and the O/W wire is showing 5.0 volts at the Throttle Position or Exhaust Gas Recirculation Valve Position sensor, verify battery voltage is present at the White/Light Blue (W/LB) wire if the Ignition Control Module and the Red/Light Green (R/LG) wire of the ignition coil are in the Run and Crank positions of the ignition switch.

If power to the coil and Ignition Control Module are ok, backprobe the Dark Blue (DB) wire of the ICM with a digital volt-ohm meter and measure voltage. The reading should indicate a reading of less than 0.2 volts or within 2.0 volts of battery voltage with the Ignition Control Module plugged in and the ignition switch in the Run position.

Bump-crank the engine to make the distributor move and recheck the key-on reading of the Profile Ignition Pickup (DB) circuit. At different points of distributor position this signal should indicate a high or low reading as stated in step 4.

If the Profile Ignition Pickup signal does indicate as stated, replace the distributor pick-up coil.

If there is no power at the R wire of the fuel injector, check the circuits of the Electronic Engine Control Power Relay located near the Powertrain Control Module under the dash on the driver side for indication of a relay failure or circuit problem.


Customer: replied 8 years ago.
that makes sense except for that if i spray gas into the throttle body it runs



Thank you for asking your question on JustAnswer.


If you can spray it and it runs , then you likely have a fuel pump issue.


In most case this a a bad fuel pump. I am enclosing the diagram for the fuel pump circuit and have marker the power points for you to check.



Customer: replied 8 years ago.
when i pull the gas line that goes into the throttle body
gas comes out of the line
so is there a sensor inside the throttle body or something that could need cleaning that the gas isn't getting to the engine properly?


Thank you for asking your question on JustAnswer.

No ,there is an injector in the throttle body. You need to check and see if you have injector pulse to it. To do this ,get your self a $8.00 Noid light and unplug the injector (top of throttle body) and plug the light in and crank it over. The light should flash providing you have power to the connector.


Ron and 2 other Mercury Specialists are ready to help you
Customer: replied 8 years ago.
thank you, XXXXX XXXXX going to change the injector
Your very welcome and Thank you very much as well.