Engine knocking

Right so the new engine has been running fine for quite a while and then all of a sudden yesterday I noticed overnight the exhaust had got quieter and power was down. Just now I had a listen an on idle/ constant speed everything sounds normal but when you change the engine speed theres quite a high pitched knocking sounding maybe in time with a slight misfire (not too sure). Seems to be enough oil. Any ideas?

Slight update, I think it may be the fuel. I went a filled up with shell v-power and it seem to knock less. I still had 1/2 tank of tesco crap though so will have to wait and see. I filled it up last week so it would have taken a while to take affect if it was the fuel? Any ideas anyway just in case its something else?

was the head skimmed considerably?

Higher compression will cause knocking but i dont have major issues on 95ron with 11.4:1

Fuel starvation can bring on detonation if the ingnition is too far advanced.

Supposed to be 11.1:1 but I don't know. It been fine since its been on, but then all of a sudden overnight this happened. Was fine sunday afternoon, then monday morning noticed it was quiet, had a better look today and it was knocking. It only seems to happen under load. I'll check it out thursday and re-adjust the tappets to rule out something relating to them, I'm pretty sure the new fuel helped though

what engine is it?

1.3 endura. I have a few things I'll check out tomorrow.Someone told me earlier it sound like just a blow so hopefully its just that

are you sure it was knocking and not just pinking?

Thats what I was thinking to start with, but now i don't think the fuel was the problem, theres something up with it. The knock sound more like a click really like a ht lead arcing or something, and it seems to be coming from the flywheel end.

Just sorted out the tappets, and checked the exhaust for blows and its still the same. However when I was checking it a new problem started up. Its started popping back through inlet manifold, although I don't know if it was because I kept revving it quickly from idle. I'm wondering if the ecu has messed something up so I'll reset that. I was messing around with throttle bodies the week before so maybe fueling it out? The cam timing can't be out and I doubt/ hope I haven't bent a valve. Bearing in mind all these problems happened over night, suggest it might be electrical?

its hard to say, are you sure your clicking / banging noise isn't an auxillery part?

I have no idea Theres not really anything over there. Even so there still the problem of loss of power/ loss of exhaust noise. Surely if a valve was done in it would run like a load of crap wouldn't it? It runs ok but with reduced power. I'm reasonably sure the engine is fine

compression test it then go from there. could your gearbox or clutch have shit its pants?

are your manifolds both sealed properly? you could have a HT lead sparking as you say, but it might be worth checking the spark plugs to make sure they are not arching or broken.

Ok slightly good news. The exhaust sound/ power is now back and seems to be back to normal, it seems the ecu was having fun with me

The sound is still there though. I don't know about gearbox, the clutch looked ok though. The exhaust manifold seems to be sealed and inlet ones seem ok. Rebuilt the rocker shaft yesterday and it was very clean

Well the tesco tank has gone now and was still knocking for a while. Left it a while and next time I started it, it had gone. So looks like it could have been pinking. Hopefully it will stay gone

Ok well I now know its an inlet leak I'm looking for. I had a go at the inlet/ head one this morning and it seems to have been reduced it a lot but is still there sometimes. Whereabouts should I be looking? Is it mainly just cfi unit down? I think the gasket between the cfi and throttle body like section is in a pretty bad way but ford don't sell it on its own

could be anywhere, check all your vacuum hoses etc

i thank you, dman i good. lol

might be worth just taking it all off, cleaning all the mating surfaces. look for cracks etc, and replace all the gaskets. any good motor factor should be able to source them, from BGA or payen, even with the head gasket set you probably won't break £15

i'd check the vac hoses first... and anything easy, i rebuilt the zetec inlet twice to find i had a leaky TPS

mg_evolution wrote:i thank you, dman i good. lol

lol

I don't think any of the pipes are at fault, I had a good check of those the other week although I'll double check them. That gasket comes as a kit for various random bits and it was £20 so I left that. I've got my own paper so I think I'll just make another

Thanks for the suggestions

I had a look over it today and I still haven't found it I've pretty much gone over the whole intake system now sealed all the gaskets and checked all the pipes but the noise is still there. I think next call will be exhaust manifold although the head gaskets are new.

Also read out the codes and there code 44 coming back which says on the internet is ""Blip" test not performed or late response". Any ideas what this could mean?

No idea what code 44 "blip" is?

Are you absolutely sure there is no vaccum leaks, Remove the air filter from the inlet pipe.
Start the car... let it idle. Put your hand on the inlet pipe... covering it, if it stalls, then there isn;t a vaccum leak as the engine would draw in through that!

Thought I might just update this. Replacing a gasket where the inlet meets the head got rid of the majority of the noise, but a hint was still there sometimes when under load. Taped over the hose joins to the MAP sensor and I *think* it has gone (bearing in mind I said this several times above ). I haven't heard it since, usually I would have heard it come back by now