Possible miss fire or something wrong. Please help

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Glanza Weston

Member +
Hello I was out last night in my car when all of a sudden the car had a huge lack of power and started slowing down. I stopped and pulled over and found that my 4 turbo bolts was of and it wasn't connected to the manifold. It sounded like a tractor. So I fixed the blowing and bolted it back up thinking that was the problem. Went to start the car and it sounds that same. Engine feels and sounds lumpy. Like its miss firing or something. I thought that I would take out the ht leads when engine is running and see if it's ignition side of things. I pulled out no1 and there was no difference in the engine. My rocker cover cone filter/breather is puffing out blue smoke.

Could this be something simple like bad spark plug, ht lead, dizzy, or something on the fueling side like injectors. Please note that 2000 miles ago it had a full engine rebuild. Could it be head gasket and it's low on compression. Could it be the rings, which it can't really be as they were new 2000 miles ago.

Please help as this is causing me alot of stress.

WHAT CAN IT BE!!!!!!
 
Texx

Texx

Super Moderator
Smoke out of the crank case breather isn't a good sign. Get a compression test done.
 
A

AdamB

Member +
Piston ringlands mate, typical engine failure on these.
Get a compression test done mate, will narrow things down.
 
Texx

Texx

Super Moderator
Most likely cause is excessive blow-by, basically combustion gases getting blown past the piston rings and into the crankcase. You need to get a compression test done to gauge whether the piston rings are sealing sufficiently. Compression test with the engine warm and the throttle wide open, then drop a small amount of engine oil (slightly less than a teaspoon full) through the spark plug hole and compression test again. The difference in readings will give some indication as to the condition of the piston rings.
 
Texx

Texx

Super Moderator
Glanza Weston said:
They have only just been done.
Click to expand...

That means very little. As Adam has said, you may have some piston rather than ring damage. The compression readings should be not be any less than 150psi with the engine warm and the throttle wide open, also you do not want to see a difference of more than 14psi between any two cylinders.
 
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AdamB

Member +
Just because the rings have just been changed it doesn't mean everything will be hunky dorey.

Who built it up? Was the block honed and cross hatched? How was it run in? Was the ring gaps measured?

There are still too many variables to say that the piston rings are 100% even though they have just been replaced.

Compression test or a more accurate leak down test would provide your answer, but since you was giving the car full beans and it went all of a sudden I would be likely to say its piston ringlands as I suffered exactly the same problem :(
 
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Glanza Weston

Member +
I bought the bottom end of a company that re ginned it and put new rings in. I ran the engine in for 1000 miles not going over like 3000rpm. Then oil and filter change. Could it be like the head gasket as its like you can hear I big blowing noise from somewhere.
 
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mitchracer

Member +
I had a forged rebuild done and after about 2500miles I started getting problems like your having, turned out to be piston failure and as I'd left it a while it made a lovely mess of my cylinders walls, I'd put my money on ring or piston damage, if I were you I'd get a compression test done sooner rather than later like they've said above and you may get away with just having to replace a piston and set or rings, good luck though mate
 
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Glanza Weston

Member +
Just done a compression test today and number 1 was 5psi 2 was 5 psi 3 was 125psi 4 was 140 psi. I thought to myself what the hell. All 4 pistons rings couldn't of gone at once so I though it HAS to be the gasket. So I poured a bit of oil into the cylinder and did it again. Nothing changed still 5psi on 1. Then I though back to when I did the rebuild and I remembered that I used the old head bolts and as there stretch bolts you can't uses them twice. This can only be what made the gasket go between 4 cylinders. First 2 being bad. So it's come down to the bolts are crap and the head has lifted abit. That would also explain why smoke is coming out of top breather as the gasket being gone its pressurising the crank and blowing up the engine. Thanks for the help though guys. ;)
 
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mitchracer

Member +
Did you use arp stretch bolts? If you did I think you may find it may have blown due to maybe not having head and block skimmed? Iv re used my arp headbolts twice and steel headgasket twice and all is holding up fine so far at 1.3bar on td05 for the last 5000miles touch wood, hopefully you just need to redo headgasket and skim and all will be sweet
 
A

AdamB

Member +
No matter what really, the head has to come off to diagnose the problem further. I would check the pistons while your at it. Drop the sump and check the oil thoroughly for any metal particles that have fallen.
 
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Glanza Weston

Member +
Took the head of today. The gasket was blown between the bores 1 and 2. That was describe the blowing. I don't think the head will need a skim as there was no over heating going on. I believe now as thinking back the reason why the gasket has blown and the head has lifted is because when I tourged up the head I did a 30nm then 80nm I believe. It then said on auto data to do quarter of a turn. I didn't do the quarter of a turn because I physically couldn't turn them. I've been told they wouldn't do that last turn because they were already stretched as they where the old onces. With the new ones that last little bit is what stretches them. Thanks for the help.
 
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AdamB

Member +
Get the head skimmed! You'll only regret it and have to pull it all back off and do it all over again, more time and money.
These heads are soft, and will buckle under the pressures the cylinders see at ignition. For the sake of £30, do it once and do it right.
 
wildchild

wildchild

Member +
AdamB said:
Get the head skimmed! You'll only regret it and have to pull it all back off and do it all over again, more time and money.
These heads are soft, and will buckle under the pressures the cylinders see at ignition. For the sake of £30, do it once and do it right.
Click to expand...

^^ cant agree more :)
do it right once & for all.
 
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