Having problems with your 1997 Mercury Grand Marquis ?

We changed the intake manifold and took the car for a ride. came home shut off let cool down and topped off fluid and the car will crank but won't start, it will only fire intermittently

Posted / edited by AnonymousUser on : 10-12-2018

Answers :

Check for any signs of moisture down in the spark plug holes, when you had it apart you may have some antifreeze down in the holes and when it got warm it boiled up and caused the coils to short out. happened to me when I did mine and had to blow them out real good with compressed air and dry out the coils too! then she ran fine after that.
The TPS sensor on the airhorn could be damaged depending on how the airhorn was changed from the old manifold to the new one. Check for good connections for that part. If the different manifold that you installed was used, the manifold must be clean where the airhorn attaches.
\015\012There are sensors in front and back of the engine. Check connections to coilpaks and crank and cam position sensors. Its possible you have a wire that sagged after it sat hot and now its grounding intermittenly.
\015\012If you still can't find a reason, try to isolate whether its a spark problem or a fuel problem. Ford made plastic and metal intakes. If you switched to plastic you may need to ground the fuelrail or a sensor.
Repair Help & Product Troubleshooting for 1997 Mercury Grand Marquis

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