1990 Lincoln Town Car

Tiny
CHRIS REYNOLDS
  • MEMBER
  • 1990 LINCOLN TOWN CAR
  • V8
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
Would a map sensor keep car fr starting?
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Monday, April 18th, 2011 AT 2:52 AM

5 Replies

Tiny
CARADIODOC
  • EXPERT
Usually not. Only Chrysler has been able to make an engine run right with just a MAP sensor but the engine will still start and run when it is defective. The clue is the engine will run, (poorly), as long as the gas pedal is moving up or down.

Other brands of cars use a mass air flow sensor to measure the weight of the air entering the engine. Those cause a lot of running problems including stalling. There could be a no-start if the fresh air tube is disconnected from it. If your engine doesn't start or run, first check for spark and fuel pressure. If you have spark but no fuel pressure, check the inertia switch to see if it needs to be reset.
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Monday, April 18th, 2011 AT 3:28 AM
Tiny
CHRIS REYNOLDS
  • MEMBER
I have fuel and spark. When I first started working on this car, I was not getting any fuel from the injectoers to the cylinders. I have since replaced the injectors and I appear to be getting fuel to the cylinders now. I am getting spark also, that is why I dont understand why it will not run. Before I changed the injectors I could pour a little bit of gas in the plenum and it would start, but I cant even do that now. Any ideas would be appreciated.
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Monday, April 18th, 2011 AT 1:18 PM
Tiny
CARADIODOC
  • EXPERT
Do you have fuel pressure? Check to be sure the fuel pump is running.
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Monday, April 18th, 2011 AT 9:35 PM
Tiny
CHRIS REYNOLDS
  • MEMBER
The inertia switch is working. Is there a crank position sensor or cam position sensor that would keep it from running?
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Wednesday, April 20th, 2011 AT 10:38 PM
Tiny
CARADIODOC
  • EXPERT
You have a pickup coil inside the distributor. If that failed or if there was corrosion on the electrical connector, you wouldn't have spark.

If you have spark and adding fuel doesn't work, you might suspect a jumped timing chain. Be sure the spark is present at the plug wires too, not just at the coil wire.
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Wednesday, April 20th, 2011 AT 11:28 PM

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