Engine run-on (dieseling in the wrong direction)

Tiny
DEAN KRUGER
  • MEMBER
  • 2004 OPEL CORSA
  • 1.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 170,000 MILES
I have the vehicle listed above B Utility model with 170000 kms on the clock. It has a multipoint fuel injection system, the engine is basically a inline 4 cylinder (1398cc) SOHC, with a compression ratio of 10:1, 8 valves, 2 per cylinder, which produces 65kw at 6,400 RPMs, it has 6 sensors with simple functions and obvious solutions and these sensors, each have different ways of showing a fault with that specific sensor. The sensors are:

1. Crank Angle Sensor
2. Mass Airflow Sensor
3. Temperature sensor
4. Map Sensor.
5. Idle Control Valve
6. Throttle Position Sensor

It has a vacuum controlled fuel pressure regulator valve so the engine is really basic and easy to find a fault and see to the fault.

I am a diesel mechanic and can't seem to get my head folded around the problem I am having. So I am asking fellow mechanics to help me diagnose the problem as I know these engines quite well, the problem is the engine has a run-on ("dieseling") problem after running hot or even cold. What I find strange is that this phenomenon happens very seldom but it happens and it bothers me, is that is when this happens, the engine diesels in the wrong darn direction, it diesels in counter rotation! So the engine have never been opened nor overheated in any way. Does not consume oil. Does not consume water neither does it have a drinking problem to the consumption related to the performance and the economy nor does it have power related problems, no smell of fuel before or after running, after this happens the restart procedure takes a few seconds to restart. So please I need Help urgently! If there is anything I have missed to mention please feel free to ask me for more technicalities and information regarding the engine specifications. Engine code is C14SE.
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Thursday, September 16th, 2021 AT 3:08 PM

3 Replies

Tiny
BORISKOP
  • EXPERT
Hello,

Running on can be caused by several issues.
Possible leaking injectors, faulty EVAP valve(drawing in fuel tank vapor) or even wrong grade(too hot) sparkplugs.

The EVAP valve is easily diagnosed by disconnecting it from the intake manifold and blanking the port off.

https://www.2carpros.com/articles/engine-surges

Check that the correct grade spark plugs are fitted.

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

Remove the fuel injectors, leave them connected though. Pressurize the fuel system and check for any leakage.

https://www.2carpros.com/articles/how-to-replace-a-fuel-injector

Please let us know how you get on.

Cheers, Boris
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Friday, September 17th, 2021 AT 3:59 AM
Tiny
DEAN KRUGER
  • MEMBER
Good day sir,

I have replaced all the old type injectors with the newer (plastic type) injectors and they are not showing any signs of leakage of any kind, no drops forming or pressure drop in the system, the spark plugs are the ones that the factory booklet prefers me to use (NGK BPR6ES or Champion RN9YCC) type plugs with is what is currently installed in the vehicle, as far as the EVAP valve concerns, it does not have one installed as the vehicle has no Lambda sensor installed in the exhaust system nor does it have a EVAP valve installed.

If you long any other information regarding my problem please feel free to ask, this is the C14NE engine as it has a 8 valve configuration and is really simple. All that I can really think that is being overlooked is either a leaking valve or a coil pack that stays energized when the ignition is being turned off in the key out position.
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Wednesday, September 22nd, 2021 AT 10:46 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

I noticed it has been a couple of days since you have been contacted. Have you made any new progress?

I read your original post. I have a couple of questions. First, is the engine running at a normal operating temperature? Also, is the fuel pressure within the manufacturer's specs? One last question. I noticed you mentioned it has a vacuum-controlled fuel pressure regulator. Disconnect the vacuum hose and see if there is any evidence of fuel being drawn into the hose.

Let us know how things are going.

Take care,

Joe
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Friday, September 24th, 2021 AT 9:11 PM

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