Plymouth Sundance - Answered Questions & Fixed Issues - Page 3

The engine computer must see oil pressure or engine RPM to turn the pump relay on. Otherwise you only get power from the relay when the key switch is first turned on. You could try to bypass the pump relay to see if the engine will run.

This is common, the pump will run for 3 seconds when key is turned to the "on" position to prime the fuel system, then it will be turned on by the ECU when the engine is started by a signal from the crank sensor.

I would not think a fuse would be the problem. A fuse either blows or it is good. The relay might be at fault, but I would think it is the pump going bad.

a worn key, worn key tumbler or damaged key switch. it will need to be replaced.

http://www.allpar.com/fix/80s-codes.html

It sounds like you have a defective alternator. The diode in the alternator my be bad and therefore not charging the battery. Have your mechanic test the alternator to confirm that that is the problem. If not the alternator, than your battery may be bad and not able to hold a charge. How old is your battery? More than 4 years old?

pick up coil

I have no solution need answer

Remove the fuel tank, then take out the sending unit See if there is You Tube Video on it, or anything, you can watch, to see what is involved

Bearings often will calm down with noise after they get hot. Just because the idler bearings, belt may be new it could still be a bearing in an alternator, AC, power steering, ect.

run fault codes and check for cam/crank position sensor problem/ Check that the camshaft is turning ( broken timing belt/chain) check operation of the immobiliser

The oil pressure light can/will keep power from reaching the fuel pump. So you would need to check oil pressure first. Then once the oil pressure light problem is resolved checking the fuel pressure might be next.

Have you checked for 12 v power at connection to fan, when engine temperature at point of fan turning on? Do you hear any relay clicking when fan should be coming on?

http://www.allpar.com/fix/80s-codes.html

Is the thermostat working, and is the cooling system full.

this problem might be happening because of a bad sensor that will cause the computer to make ur car go into limp mode. its a safty thing so that you dont over power ur engine causing damage.

Try increasing idle speed or tweek mixture

Sounds like you have overlooked something.Does the motor have power and ground when the switch is on low or high ?

The most common reasons are one of the pulleys is not lined up with the others, or one of the pulleys has a rough groove or edge, or one of the pulleys locks up and burns the belt.

auto parts store can order rebuild engine or go online look for rebuild engine for 91 plymouth.should find one on internet.