engine surges or misfires while moving

symptom: The engine surges or misfires while moving.

The engine seems to start fine and will normally accelerate fine. As you are driving and maintaining a steady speed, the engine seems to “speed up” slightly or it seems to miss and buck.

Possible causes:

1. If you have a carburetor (there are still a few out there), the choke may not be set properly, or the choke may not be working correctly.

The fix: Check the choke plate and make sure it is opening completely.

2. The engine may be running too hot.

The fix: Check and repair cooling system.

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

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

4. The ignition timing may be set wrong.

The fix: Adjust ignition timing.

5. Ignition system problem.

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

6. There may be a fault in the computerised engine control system: Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (Generally not a DIY job)

7. The fuel filter may be partially clogged.

The fix: Replace the fuel filter.

8. Torque converter (automatic transmission only) may not be locking at the right time, or it may be slipping.

The fix: Check lock up circuit or replace torque converter. (Not a DIY job)

9. There may be a vacuum leak.

The fix: Check and replace vacuum lines as required.

10. Possible internal engine problems.

The fix: Check compression to determine engine condition.

11. EGR valve may be stuck open.

The fix: Replace EGR valve.

12. Drive axles may be loose or worn.

The fix: Check and replace CV/universal joints as required.

13. The fuel injectors may be dirty.

The fix: Clean or replace fuel injectors.


Ellesmere Port

“Just a short note to let you know that the service that Ellesmere Port Engine Centre and its staff provide in the timely repair of my personal and company vehicles is the best that I have experienced. From the simple tasks of changing oil to the not so easy rebuild of my Ford F-350 clutch and 6 speed manual transmission, no job seems insurmountable for your technicians. Your prompt same day service, fair pricing and unbeatable warranty will always make your facility my first stop for all my auto repair needs. As a small business owner we do appreciate you taking care of business. We have had our business for over 8 years and would recommend your repair facility to anyone. Ellesmere Port Engine Centre friendly and no nonsense approach to repairs and warranty make it almost fun to have my vehicles repaired. Thank you for all your good work”

Ste from Ellesmere Port