1990 Dodge Shadow Problems

RepairPal has identified the most common problems with the 1990 Dodge Shadow as reported by actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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29
Known Problems

4 Cylinder engines may exhibit an erratic idle with the Check Engine Light illuminated. These conditions are most commonly present during cold engine operation in rainy weather. Our technicians  tells us that there is an updated idle air control valve available to correct this concern.

4 cylinder engines may develop driveability issues and illuminate the Check Engine Light due to engine vacuum leaks. These vehicles use plastic vacuum lines which can become brittle due to heat and age. Care should be taken when replacing these lines as some may have a restrictor orifice molded inside. If lines are replaced without including the restrictors driveability issues will remain.

4 Cylinder engines, with a hard starting condition when cold and illumination of the Check Engine Light may have corrosion build up on the engine coolant temperature sensor. Our technicians tell us that the coolant sensor and pigtail should be replaced to correct this issue.

Hard starting, rough idle, black exhaust smoke, or poor fuel mileage may indicate a fuel leak from the area of the fuel injector. Our technicians tell us that in most cases the injector o-ring is the cause of these leaks.

Hard starting, rough idle, black exhaust smoke, or poor fuel mileage may indicate a fuel leak from the area of the fuel injector. Our technicians tell us that in most cases the injector o-ring is the cause of these leaks.

Vehicles equipped with a 4 cylinder engine may develop a no start or stalling condition, most commonly caused by a failed distributor pickup plate.

4 cylinder engines may develop one or more of the following concerns: Erratic idle, hesitation, and lack of power. Common causes include: Faulty throttle position sensor, brittle or broken wires & corroded or spread terminals in the engine wire harness, cracked or swollen vacuum hoses, and oil contaminated o2 sensors. Our technicians recommend a complete inspection including diagnoses of any stored fault codes if these driveability concerns occur.

The fuel pump may fail resulting in a no start condition. Our technicians recommend replacing the fuel filter whenever the fuel pump is replaced. Failure to replace the fuel filter may cause the replacement pump to fail prematurely.

An exhaust leak and/or chirp type noise may develop from the exhaust manifold to header pipe connection. Our technicians tell us that replacing the exhaust seal ring and flange springs, along with sizing the header pipe flange will generally correct this concern.

Erratic operation of the heater may be caused by a leaking head gasket. Our technicians recommend a complete inspection of the cooling system and engine should be performed if this condition is present.

The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops.  There is also a revised vacuum check valve available to address this concern.

Alternator pulley misalignment on 4 cylinder engines may result in belt noise and/or the belt "walking" partially off the pulley. Our technicians tell us that replacement of the AC and alternator mounting bracket, alternator belt, and if necessary, installation of washers to align the alternator pulley may be necessary to correct this issue.

4 cylinder engines may develop a coolant leak from the water pump area. It is not uncommon for the sealant used on the water pump to degrade over time, newer models have an upgraded rubber gasket. Our technicians tell us that the o-ring where the water pump housing mounts to the engine block may also leak which can appear to be a leaking water pump.

 

 

A noise from the rear suspension may be noted at slow speeds over uneven road surfaces. This can be caused by a cracked or broken rear torsion bar. A damaged torsion bar will require replacement.

A squeak noise may be noted from the strut mount area when turning. The repair involves replacing the strut mount assembly.