Dear Paul, my mother owns a 2001 Suzuki Swift 1.3L, and the problem with it is that the moment it is moving after about one kilometre or less, it stalls. The process starts with the “Check Engine” signal coming on and in the next about 10 seconds, it is off.

The moment you start it immediately, it behaves as if it has no fuel. You always have to wait for 5-10 minutes before it can start again. I have changed the fuel pump and plugs at the advice of mechanics but the problem has persisted.

The moment it starts, the engine and movement is smooth once again until over the same distance the cycle repeats.
For a distance of about five to 10 kms, the stoppages are about three to five times. It is as if the engine needs to cool down before it can move again. The radiator etc are all fine. Please advise. Regards, Herbert Ntare

Hello Herbert, the presence of a check engine fault light suggests that the fault in your mom’s Suzuki Swift has been recorded by the engine management system.

The quickest way to identify this fault will be with a computer car diagnostic tool. Based on the symptoms you have described (engine stalling after heating up and failure to start when cranking until engine cools down).

I suggest you check the crankshaft position (CKP) sensor, which is a likely cause of the problem. The CKP sensor helps the engine management system to regulate spark delivery by monitoring the crankshaft movement.
This information is compared with the rotational movement of the camshafts via the camshaft position sensor to monitor engine timing and determine fuel injector pulse and spark.

A failure of the CKP sensor can be confirmed when the tip loses its magnetism which is crucial for reading the crankshaft movement via the flywheel.
As a result, the computer will not be able to regulate delivery of the ignition spark.

Dear expert, I am called Clive.
I own a 2002 Toyota Mark II Blit IR-S 2,500cc. When I start it in the mornings, I experience low revs and at times it goes off. And when I start again, it picks up to normal, that is, slightly above 1,000 rpm. For your information, the battery is new. What could be the problem?
Also, when going uphill, I experience loss of power and the movement is not smooth (reduced power). Could that be related to the oxygen sensor? Please advise.

Hello Clive, your Toyota Mark II is exhibiting signs of reduced engine performance. It would be interesting to know what mileage it has covered to establish if it is overdue for the Toyota 100,000 kilometre service B routine maintenance.
Reduced engine performance may be caused by overdue filter replacements such as the long-life fuel filter (in the fuel tank) or air filter. The condition of your spark plugs will affect the ignition spark and hence engine power.

Ask a mechanic to inspect or replace those parts.
The mechanic ought to check the condition of your throttle potentiometer in case the throttle valve is clogged with soot. Finally, find a garage with a computer diagnostic tool to scan for electronic faults such as a faulty airflow (MAF) sensor.

The MAF can send wrong air volume and temperature information to the engine computor (ECM), which leads to the delivery of wrong fuel air ratios and curtails engine power.

The oxygen sensor is also used by the ECM to establish efficient engine combustion by monitor oxygen levels in the exhaust when it fails it usually leads to the engine running rich (more fuel than air) erratic engine performance and poor fuel economy.