Engine Makes Popping Sounds and Hesitates or Lags


Popping and Hesitating

Engine Makes Popping Sounds and Hesitates or Lags

the Symptom: Engine hesitates, and a popping is heard from the engine. When you step on the gas, the engine seems to bog down or takes a second to respond. You may notice a general lack of power. You may notice the problem when the engine is hot or cold or when you are low on fuel. The popping noise really tells you something is not right.

Possible causes:

1. You may have a dirty air filter.

The Fix: Replace the air filter.

2. The ignition wires may be bad.

The Fix: Replace ignition wires.

3. There may be some other type of ignition problem.

The Fix: Check distributor cap or rotor. Ignition module may be bad.

4. Internal engine problem.

The Fix: Check compression to determine engine condition

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Engine using oil and there is smoke in your exhaust


Smoke in Exhaust

Engine using oil and there is smoke in your exhaust

Symptom: Engine uses more oil than normal, and there is some smoke from the exhaust. The oil level is low between oil changes. It appears that the oil is being burned by the engine because of the smoke in the exhaust. You may or may not notice the engine doesn’t have the same power as it used to.

Possible causes:

1. The PCV system is not working properly.

The Fix: Replace PCV valve.

2. The engine may have mechanical problems.

The Fix: Check compression to determine engine condition.

3. The engine’s piston rings may be worn.

The Fix: Replace piston rings. (Generally not a DIY job)

4. The engine’s valve seals may be worn.

The Fix: Replace valve seals. (Generally not a DIY job)

Car using oil, but no smoke in the exhaust


Car using oil, but no smoke in the exhaust

Symptom: The car uses more oil than normal, but there is no trace of smoke from the exhaust. The oil level is low between oil changes. You never noticed it before and it doesn’t appear that the oil is being burned by the engine. There is not a trace of smoke in the exhaust.

Possible causes:

1. The PCV system is not working properly.

The Fix: Replace PCV valve.

2. The engine may have mechanical problems.

The Fix: Check compression to determine engine condition.

3. The engine’s valve seals may be worn.

The Fix: Replace valve seals. (Generally not a DIY job)

4. The engine’s gaskets and seals may be damaged.

The Fix: Replace gaskets and seals as required.

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).

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,