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Dave Nova
Dave Nova, Cadillac Technician
Category: Cadillac
Satisfied Customers: 1522
Experience:  ASE Master Certification. GM World Class Certification
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My 91 Cadillac Deville will run if the motor has been

Customer Question

My 91 Cadillac Deville will run if the motor has been setting for awhile, or is cold but as soon as it get warm or operating temperature, it starts missing bogs down then won't idle or pull itself when it's put into gear and soon it does. What can i do to fix this? I've already put new plugs, wires, oil change, all the basic maintenance. What gives?
Submitted: 6 months ago.
Category: Cadillac
Expert:  Chad Farhat replied 6 months ago.

Hi my name is ***** ***** will be assisting you

Customer: replied 6 months ago.
What's wrong with my car?
Expert:  Chad Farhat replied 6 months ago.

1991 Cadillac DeVille V8-300 4.9L

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Cam Position Sensor

The cam position sensor is a Hall effect switch located in the distributor. It provides one pulse per rotation of the distributor. The PCM/ECM uses the cam sensor signal to know the location of the camshaft for proper fuel distribution. PCM/ECM code E41 will set if the computer receives reference pulses and does not detect a cam sensor pulse.

Expert:  Chad Farhat replied 6 months ago.

is this the original distributor ?

Expert:  Chad Farhat replied 6 months ago.

and you need to test the mass air flow sensor

how many miles you have on it

Expert:  Chad Farhat replied 6 months ago.

Have you checked the fuel pump pressure after it get hot is holding the pressure at warm temps

so is few check you need to do

Vehicle » Powertrain Management » Fuel Delivery and Air Induction » Fuel Pressure » Specifications » Pressure, Vacuum and Temperature » Fuel System Pressure Specifications

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1991 Cadillac DeVille V8-300 4.9L

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FUEL PRESSURE: Ignition ON Engine OFF .......................................... 40 - 50 psi Idling With Vacuum hose Connected To Regulator .................. 32 - 38 psi NOTE: Refer to Chart A-5 Fuel Pressure and Injector Flow for pressure testing procedures and additional specifications. See: Fuel Pressure > Component Tests and General Diagnostics > Chart A-5 Fuel Pressure and Injector Flow

let me know , it 4 am where i m at but I will log back in tomorrow at 12 and we can continue

Thanks

Customer: replied 6 months ago.
Ok thank you. It has 230,000 miles on it.
Expert:  Chad Farhat replied 6 months ago.

ok cool , you welcome

I will talk tomorrow