Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
Can you tell me the DTC that is set?
Are you using a genuine coil pack? I have seen aftermarket coil packs cause the issue you are having.
Did you also fit the correct spark plugs?
Can you give me the code that was set? ie: P0301
If you're real lucky the ECM is not fried from the coil.
Do you still have the original coil?
You can check for spark from each coil to ground while cranking, BUT it is best to check it with TECH 2 as you can test each coil one at a time, with just key on, not cranking.
Does the engine have a definite misfire on one cylinder only, or is it rough in general at idle?
The P0100 is a MAF dtc, it is fitted the correct way, arrow towards engine?
The P0351 is a faulty coil circuit primary/secondary circuit.
Can you please fit the original coil and see what it does?
And has the timing belt/valve timing been verified?
Ok, with original coil fitted and the previous history DTC cleared, what code sets after starting the car.
You could have an original misfire on cylinder 1, but now a faulty coil circuit cyl 1 with an aftermarket coil.
I have seen ECMs go faulty after a non-genuine coil fitted.
So what code set after the genuine coil fitted?
Have you also checked for any vacuum leaks, especially the purge hose that runs from the manifold under the inlet duct towards the purge solenoid on the drivers inner guard?
Can you please fit the original coil and note the NEW code that is set?
Not interested in the old P0351 from the VDO unit for now.
The P0100 is because the engine is not inhaling the air it should be.
Can you perform a cylinder leakdown test?
Possibly riding valves once running.
Have you ever tried some upper cylinder cleaner and see what it can do for valves etc?
Like Subaru or AC Delco.
While you have a misfire from a faulty coil, the injector for that cylinder is then disabled.
Get rid of the VDO coil, refit the original coil and tell me the DTC that sets, as I requested above.
If is then P0301 not P0351, then your original coil is also faulty but not in the same way as the VDO coil.
Do you know anybody with another genuine coil you could try?
Ok, have you still got the P0351?
The injector will not fire while the P0351 is set.
Try another coil first.
Then you may need to verify the NO.1 injector circuit.
My bet is your coil is the fault.
If you don't know the original DTC, you'll be guessing now.
I would say that your ECM is faulty, and your aftermarket coil has probably hurt the ECM.
I'VE SEEN THIS BEFORE WITH A CUSTOMERS CAR AND COST THE WORKSHOP ALMOST THE ENTIRE REPAIR COST.
On this car, not only did the original coil get replaced TWICE, it also needed an ECM since the coil circuit was damaged by the aftermarket coil.
Does your P0351 set as a CURRENT DTC with just key on, or after starting the engine?
Ok, which way do want to go now?
You need to test the wiring between the coil and the ECM.
9 times out of 10, the ECM will be the fault.
Best for a Holden dealer now, as you will be unlikely to do this at home.