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[denisaok]

Hi
Am getting a missfire it sounds like a plug lead is arckin but the 2.6 dose not have leads seems to do it mostly when hot and sometimes when cold and starting to move off i have no power would this be the coil pack on the way out would it also store any codes

[Darth Loo-knee]

Have you checked there is no oil in the plug wells? is can cause missfiring...

[denisaok]

yes no oil wells  have also changed rocker gaskets and did cambelt have checked timimg an its spot on

[Darth Loo-knee]

I aren't the expert at all but would seem then either the leads or dispack....
Someone with better knowledge will be along soon though

[Entwood]

Might sound daft .. but try running it at night in a dark place with the bonnet open .. you can sometimes see the discharge from shorting HT system. Move the leads about gently with a very well insulated screwdriver, this might show which coilpack is playing up.

Failing that try and disconect each coilpack in turn , good ones will make it run worse, bad one will show no difference

HTH

[sassanach]

he has'nt got any ht leads!!!

[sassanach]

however as i understand it from following this forum each cylinder can now generate a fault code.refer to the all knowing one for confirmation!!

[Entwood]

he has'nt got any ht leads!!!

I didn't say HT leads I said system  If the coil pack is breaking down it might still be visible, if you move the LT leads going to the coil packs that might cause the breakdown to be visible as well..

[Marks DTM Calib]

however as i understand it from following this forum each cylinder can now generate a fault code.refer to the all knowing one for confirmation!!

Correct.

The ECU uses the knock sensor to detect missfires and will store fault codes against a cylinder and under extreme conditions, shuts off the injector to that cylinder to protect the cat.

Best way to diag them is to use a clip on load set to 40KV and fir the coils one at a time using tech 2.....

A visual inspection of the coil pack sometimes also gives some info, look for signs of the casing cracking or rusted iron cores.

[denisaok]

Thanks all

My mates got a real tech 2 but dose not know how to use it properly yet his working on that any way we read the codes today can anyone help with these codes that were stored.
P0100
P0170  
P0173  
P0300
P0301    
P0302    
P0306
P0650

[Marks DTM Calib]

Thanks all

My mates got a real tech 2 but dose not know how to use it properly yet his working on that any way we read the codes today can anyone help with these codes that were stored.
P0100
P0170  
P0173  
P0300
P0301    
P0302    
P0306
P0650

Are you sure he has a real TechII.....as when you get a fault code it comes up with te description to!

P0100 Mass airflow circuit error (a real tech 2 gives further details as to what the error is!)
P0170 Fuel trim malfunction bank 1  
P0173 Fuel trim malfunction bank 2  
P0300 Random multiple cylinder miss fires detected
P0301 Cylinder 1 miss fire detected  
P0302 Cylinder 2 miss fire detected  
P0306 Cylinder 6 miss fire detected
P0650 MIL indicator error (again a real tech 2 gives further details!)


Have you get an air leak.

Did he reset the codes and then re-read them to see if any are old erroneous ones

[Big_Roger]

Hi, What a concoction of codes.  For info:

0100= MAF or VAF circuit malfunction
0170= Fuel trim Bank 1 circuit malfunction
0173= As above but Bank 2
0300= Random multiple cylinder missfires
0301= Cylinder 1 missfire detected
0302= As above but cylinder 2
0306= As above but cylinder 6
0650= MIL control circuit failure

HTH

Have you been doing anything on the engine before all this trouble ??

Look on each CPP unit very closely, with magnifier if neccessary, for hairline cracks down the HT insulator noses or bulges in the plastic around the iron cores and rust, are the rubber insulators around the HT connector springs OK.  This is how I found which CPP unit on mine was faulty.

The CPP units on each cylinder bank are different. If you have to get replacement, try Vauxhall spares warehouse. same Bosch units and much cheaper than Vx dealer.

It looks to me like you should be looking for air leaks or fuel probs or unit electrical / plug connections first.

HTH

Roger

[feeutfo]

have read maf sensor failures are rare so look for a reason why it would not read correctly, wiring to it, or air leak in the inlet somewhere.
Hope helps

[denisaok]

Hi all
Thanks for all your help so far

Yes it’s a real tech 2 its this one http://www.auto-diagnostics.info/opel_tech2 but as i said he dosent know how to use it properly yet.
when he did a reset only p0650 came back and car took a while to start up.an we did not have time to check again.I will put it back on tech 2 tomorrow to check codes.
Yes it did have more description I have now added them below not sure if I wrote them down properly . One more thing I have also noted is that when fault develops and I am moving off if I push the  brake peddle is rock hard and I can just about push it to make the car stop.

I also changed both coil pack but it's still the same also where should i be looking for air leaks.

P0100   ( not present mass or volume air flow circuit range / performance problem
P0170   (9) present fuel train malfunction (bank 1)
P0173   (9) present fuel train malfunction (bank 2)
P0300   ( not present ramdon multiple cylinder misfire detected
P0301    ( not present 1 cylinder misfire detected
P0302    ( not present 2 cylinder misfire detected
P0306    ( not present 6 cylinder misfire detected
P0650 (4) malfunction indicator control circuit open (mi)
 

[MarkG]

Ahhhhh. Poor braking. Start looking for air leaks. Open the bonnet with the engine running and listen for hissing. I'll bet the main brake servo pipe has a hole in it where it rubs up against part of the AC pipework. Look at the pipework at the back right hand side of the plenum. If it has a hole, you can make a temp repair with some duct tape