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bad misfire after head swap 

 

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 Post subject: bad misfire after head swap
Posted: Sat Jul 02, 2011 7:03 pm 
Parts Gopher
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im aware this probably comes up alot but i think this is different . on tuesday night i was driving home from work when the car started misfiring really badly and shaking.

i got home and parked the car. the next day i decided to remove the head as i had a suspicion that that was the cause of my problems. and sure enough i found all the cylinders about 4 or 5 cm full of coolant. the next day cylinder 2 and 5 had no coolant in them while the rest had held theres. i didnt have any rags at the time to remove the coolant.

so i took the head to a shop and got it checked out. it had cracked the water jacket in cyliner 3 into a valve. i was expecting it to have something wrong so i wasnt surprised i then got a full recod one form the shop. i also replaced leads and spark plugs. i also have extractors ( im going for detail).


i fitted it all up changed the oil and got to start it. it ran really badly went for a short drive to see if it improved. it didnt.


a list of all the things ive tried and ruled out.

-bad fuel drained tank refilled with about 15l i dont think its the filter only 5000ks old.
-lead and plugs i tried with the old leads and plugs it didnt change.
-im reletively certain it is timed properly all marks seem to be where they should.
-disconnected battery incase it was a computer thing.
-checked spark alll seem weak so im leaning towards coilpack.
-i had fitted the stock exhaust gasket to my extrasctors this was suggested to be the problem so i put the old gasket in still there. the new gasket was restricing a little bit
-checked that rockers were getting oil they are.
-triple checked that leads were all on the right postions.
-triple checked all vaccumm hose i touched or might of dislodged.
-triple check all plugs that i might of knocked off.

also when it is running if i take the lead off number five there is no change but if i remove number one it gets worse so im thinking its a coil fault. the other things ive considered are a cracked block not sure if this is possible and maybe one of the rods bent a little so it run bad?

any ideas would be appreciated thanks heaps
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 Post subject: Re: bad misfire after head swap
Posted: Sat Jul 02, 2011 10:25 pm 
Getting Side Ways
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tried a different oxygen sensor? if there was a lot of coolant getting burnt it may have died

 

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 Post subject: Re: bad misfire after head swap
Posted: Sat Jul 02, 2011 10:31 pm 
Parts Gopher
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sweet i shall try it tomorrow
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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 12:05 pm 
Parts Gopher
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i think i can rule out a cracked block as i took out the plugs to day and used a straw to check for any water in all the cylinders and there was none.
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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 12:27 pm 
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Exhaust Valve not sealing on No5.
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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 12:57 pm 
Getting Side Ways
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If you had water in the bore you may have bent a rod, was that checked?

 

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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 1:20 pm 
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I'd try coils first and see what happens. If that doesn't solve your issue check your fuel filter just in case. Having a tank sit for a while without movement will have sediments line the bottom of the tank and near the pump pick up (assuming there may be dirt and such in the tank). Even though there is an in-tank filter, it will still pick up the fine grit that gets stuck at the external filter.

 

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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 1:54 pm 
Parts Gopher
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SWC wrote:
Exhaust Valve not sealing on No5.


the head is a recod one is it still a good chance that the valves are not seating?
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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 1:55 pm 
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twase wrote:
If you had water in the bore you may have bent a rod, was that checked?


i didnt measure the hieght when i had the head off but they seemed ok.
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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 2:00 pm 
Getting Side Ways
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twase wrote:
If you had water in the bore you may have bent a rod, was that checked?

get the compression checked

 

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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 2:02 pm 
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hans hartman wrote:
twase wrote:
If you had water in the bore you may have bent a rod, was that checked?

get the compression checked


ok sweet ill definately get tht done. its really frustrating to have done my mates motor and head and not had an issue then to do mine and its got this problem.
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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 2:47 pm 
Getting Side Ways
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how many ks on motor?

 

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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 2:56 pm 
Parts Gopher
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hans hartman wrote:
how many ks on motor?

315000
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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 3:03 pm 
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alexxx wrote:
hans hartman wrote:
how many ks on motor?

315000

compression for sure,dont like all the water

 

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 Post subject: Re: bad misfire after head swap
Posted: Sun Jul 03, 2011 3:52 pm 
Getting Side Ways
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alexxx wrote:
twase wrote:
If you had water in the bore you may have bent a rod, was that checked?


i didnt measure the hieght when i had the head off but they seemed ok.



But you cant see the rods when you've only got the head off.

 

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