Thread: Missing & running on 4

head gasket could have gone on one side?

How does he know it is only running on 4.. could it be 5 or 6?

Could be getting water into some bores which affects it until its hot enough that the water evaporates.

Pete

Originally Posted by Psimpson7

head gasket could have gone on one side?

How does he know it is only running on 4.. could it be 5 or 6?

Could be getting water into some bores which affects it until its hot enough that the water evaporates.

Pete

Ok i not sure, I only spoke with this guy on the phone.

No matter whether its hot or cold at idle it gets worse and worse till its on 4.

The only way he says it is on one bank is all pipes on the exhaust manifold are stone cold for ages, where as the other side are hot after a minute or two of idle.

sorry misread your post.. revs! not temp!

The ECU batch fires the injectors by bank.
If in fact it is running on one bank, the most likely guess that I have is that either there is a poor connection in the plug to the injector loom for one bank , or the amplifier for that bank has died in the ECU.
Regards Philip A

thanks phillip

I'll back phillipA on this one but dont discount deteriation of the harness to one side.

theres some more stuff that it might be but generally these will not take out one side but a random collection of cylinders or will have other obvious symptoms.

things like vavle failures , head failures, injectors failing, blockage in the manifold (usually cause some numptie left rags in the manifold when rebuilding the engine) Ive even seen an engine with a few toasted rings that wouldnt free up till the engine was reved hard while hot, would run like a pig on about half its pots with huge blow by problems till the rings sorted themselves then it would be sweet till you let it cool down again.

But they all had other clues as to the problem.

which is what we really need here, more clues, is it sparking on the lazy pots are they getting fuel, have they got compression?

G`day

Be a bit too late now but....


Tell him if it`s over fueling , smell of fuel out the back to check the 2 grey wires in the loom , they are earths for the injectors and one for each bank .

If it`s not getting fuel from the injectors not opening , which sounds more likely from your description , tell him to check the injector resistor pack

It has 2 banks of resistors in the one unit a seperate bank of resistors for each bank of cylinders . ( 4 resistors for one bank of 4 cylinders and another bank of 4 resistors for the other 4 cylinders .

It should be mounted on or near the airflow meter bracket .

There`s not anything else i know of that will shut down in banks , if the ECU was at fault it shouldn`t run at all .

Cheers

It is very rich when this problem occurs so I would say it is getting fuel but no spark.

I'll prob give him a call today to discuss a few of these other opinions and hopefully he can get a better understanding of his drama.

Thanks again for all the help guys. I don't know this fella (never met him before or seen his car in my life) but its good to do our best, as enthusiast to help each other out.

Cheers
Grimace