Engine quickly overheats


Engine quickly overheats

Symptom: Engine quickly overheats. Engine runs fine but gets very hot shortly after you start it. This problem usually occurs after only five minutes of running or after traveling about a mile. You may or may not notice steam coming from the hood or smell coolant.

Possible causes:

1. Engine coolant level may be very low.

The Fix: Refill coolant to proper level.

2. Engine’s drive belts may be broken or slipping.

The Fix: Tighten or replace belts.

3. The electric cooling fan may not be coming on.

The Fix: Repair or replace cooling fan. Repair wiring. Replace cooling fan temp sensor.

4. The ignition timing may be set wrong.

The Fix: Adjust ignition timing.

5. There may be a vacuum leak.

The Fix: Check and replace vacuum lines as required.

6. The engine may have mechanical problems.

The Fix: Check compression to determine engine condition.

7. The engine’s thermostat may be stuck closed.

The Fix: Replace thermostat.

8. There may be a leak in the cooling system.

The Fix: Repair leak and refill coolant. Cylinder head gasket(s) may be bad.

The Fix: Replace cylinder head gasket(s).

Advertisements

engine will not idle smoothly


The engine will not idle smoothly

Symptom: The engine will not idle smoothly, or it stalls during idle when the engine is warm. When the engine is warm or hot and you take your foot off the gas pedal, the engine runs very rough and may even stall. When you run the engine at higher speeds, it seems to run fine.

Possible causes:

1. If you have a carburetor (gramps), you may have a bad accelerator pump or power circuit.

The Fix: Replace accelerator pump or replace carburetor.

2. There may be a vacuum leak.

The Fix: Check and replace vacuum lines as required.

3. The fuel pressure regulator may be operating at too low a pressure.

The Fix: Check fuel pressure with a fuel pressure gauge. Replace fuel pressure regulator. (Generally not a DIY job)

4. Idle speed set incorrectly.

The Fix: Set idle speed to specs.

5. There may be some type of ignition problem.

The Fix: Check and replace distributor cap, rotor, ignition wires and spark plugs.

6. There may be a fault in the computerized engine control system.

The Fix: Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (Generally not a DIY job)

7. The EGR valve may be bad.

The Fix: Replace EGR valve.

8. The engine may have mechanical problems.

The Fix: Check compression to determine engine condition.

9. The fuel injectors may be dirty.

The Fix: Clean or replace fuel injectors,

Problems With Engine Idle


Troubleshooting Problems With Engine Idle

In many ways, engine idle is a good measure of your engine’s health. If anything is going wrong under the hood, there’s a good chance it will be affecting your car’s idle speed and quality. Problems with idle speed, things like slow idle, low idle, bad idle, lumpy idle, fast idle — these are symptoms that should be investigated, troubleshooted, diagnosed and repaired. The following symptoms and related problems should act as a guide in helping you troubleshoot your idle issues.

Symptom: The engine will not idle smoothly, or it stalls during idle when the engine is cold. When the engine is cold and you take your foot off the gas pedal, the engine runs very rough and may even stall. When you run the engine at higher speeds, it seems to run fine.

Possible causes:

1. If you have a carburetor, you may have a bad accelerator pump or power circuit.

The Fix: Replace accelerator pump or replace carburetor.

2. There may be a vacuum leak.

The Fix: Check and replace vacuum lines as required.

3. There may be some type of ignition problem.

The Fix: Check and replace distributor cap, rotor, ignition wires and spark plugs.

4. The ignition timing may be set wrong.

The Fix: Adjust ignition timing.

5. There may be a fault in the computerized engine control system.

The Fix: Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (Generally not a DIY job)

6. The EGR valve may be bad.

The Fix: Replace EGR valve.

7. The engine may have mechanical problems.

The Fix: Check compression to determine engine condition.

8. Idle speed set incorrectly.

The Fix: Set idle speed to specs.

9. The fuel injectors may be dirty.

The Fix: Clean or replace fuel injectors.