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Old 31-03-2009   #1
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Fixing My 1.4 Bravo Engine Misfire

I was getting lots of blue smoke out of the exhaust and my car destroyed two spark plugs in cylinder 2, creating a misfire. So ive decided to repair the car myself. I was getting blue smoke from cold and it would burn off after say 5miles, then sometimes you would get a puff of blue smoke on acceleration. I noticed oil being pushed through the oil breather into the SPI. Rocker cover was leaking oil uniformly all the way round.

Car Started misfiring.
Last week the plug in number 2 was naff.
Had a look at the plugs today and;

Today;
1-oily
2-oily
3-dry light brown
4-dry light brown

Last Week;
1-dry light brown
2-oily (and Broken)
3-dry light brown
4-dry light brown

Also you can smell exhaust under the oil cap.

compression test results, from cold with throttle fully open and dry (though some cylinders must be wet from the oil leak) I didn’t do a wet test.
1 153 psi
2 190
3 190
4 170

Not got the head of just yet. As expected im struggling with the exhaust manifold.

The rusted nuts have taken six of the eight studs out, probably would have been better if the other two studs came with it.

Taking the down pipe bracket off and the bolt sheared, not surprising really it is a rusted mess.



Everything under the rocker cover looks really good though. There was a very strong smell of exhaust under the rocker cover.

When I drained the water there was a very small amount of oil in the water but no water evident in the oil.

I took the air intake manifold of and the branch leading to cylinder-2 had oil.

look at all this (exhaust carbon presumably) on the inside of my rocker cover.


What do you make of this muck on my rocker cover? Im planning to unbolt my exhaust in front of the CAT and take it off in one part, any thoughts?

Last edited by Adrian Bravo; 31-03-2009 at 21:33.
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Old 31-03-2009   #2
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Re: Fixing My 1.4 Bravo Engine Misfire

the muck just looks like normal burnt on oil, perfectly normal.
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Old 31-03-2009   #3
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Re: Fixing My 1.4 Bravo Engine Misfire

Sounds like oil is getting in to the combustion chambers. There are several ways that can happen:
1. Worn valve guides.
2. worn or broken piston rings or worn cylinder bore.
3. head gasket gone between an oil way and the combustion chamber.
Head off and check it all is the only way.

The deposit on the inside of your cam cover is quite normal by the way.
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Old 31-03-2009   #4
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Re: Fixing My 1.4 Bravo Engine Misfire

Nice one guys.
Should get the head off tomorrow morning. Got bogged down this afternoon trying to get the exhaust manifold off broke one bolt, so called it a day.
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Old 01-04-2009   #5
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Re: Fixing My 1.4 Bravo Engine Misfire

lots of pictures.
Id love any advice.

Under the rocker cover.


Head Gasket, only thing i can pic out is the rusty bulge and the big missing chunk at the bottom.


Bores, Im worried about number 1 it has scoring 4 is almost as bad 2,3 are lighter. What do you think?


Valves,


Piston tops, look at all the pitting round the edge of 1. Again 4 has noticeable pitting round the edge, 2,3 have almost unoticeable pitting on the edge.



So what do you think about the gasket, scoring and pitted piston top?
Oh yeah there was no debris in any pistons.
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Old 01-04-2009   #6
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Re: Fixing My 1.4 Bravo Engine Misfire

tried to get a pic behind some valves
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Old 01-04-2009   #7
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Re: Fixing My 1.4 Bravo Engine Misfire

I'd say straightforward worn engine, especially No. 1 pot. Damaged ring causes scraping of bore and low compression, exhaust blow-by. Marks on top of piston caused by something bouncing around, maybe a bit of ring, or maybe something that got in and caused the ring damage. Rebuild or replace the engine I reckon.

My old Tipo 1.4 has a low compression on one cylinder (can't remember which one), I never investigated further. It's the same engine as yours below the cylinder head...
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Old 01-04-2009   #8
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Re: Fixing My 1.4 Bravo Engine Misfire

Ive taken the valves out from cylinder 2. No bad/obvious damage but the two inlet valves are covered in carbon. Is this right? I would expect the inlet valves to be closed when the engine fires.

Valve guides are fine, valve oil seals are crispy and hard.

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Old 01-04-2009   #9
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Re: Fixing My 1.4 Bravo Engine Misfire

no thats been nipped up overheated for sure lack of water maybe a blown head gasket in it's previouse life thats not general wear and tear
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Old 01-04-2009   #10
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Re: Fixing My 1.4 Bravo Engine Misfire

it looks like the rings have gone to me.

the engine isnt worth trying to save, i would get a replacement, possibly even a 1.6 as i believe thats a simple swap, ask ShaunCo as he has done it before.

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Old 01-04-2009   #11
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Re: Fixing My 1.4 Bravo Engine Misfire

Nothing usefull but ive figured out where the pitting on piston 1 has come from. Look at this picture of piston one and the head.



There are two lips on the head with a little carbon flakes on them. Thats what has pitted the 1st piston.

Looks like a bad design.
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Old 01-04-2009   #12
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Re: Fixing My 1.4 Bravo Engine Misfire

this is why everyone says its a poor engine !
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Old 02-04-2009   #13
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Re: Fixing My 1.4 Bravo Engine Misfire

I cannot remove the valve oil seals. It seems utterly impossible. I have pulled three and they just rip, leaving the bottom of the seal stuck in a recess no amont of prodding is getting them out.


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Old 02-04-2009   #14
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Re: Fixing My 1.4 Bravo Engine Misfire

Got the valve oil seals out, with mole grips. I thought the metal part was the head but its just the collar round the rubber seal.
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Old 02-04-2009   #15
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Re: Fixing My 1.4 Bravo Engine Misfire

Just found this pitting on the back of the head
number 2 piston the one that killed two plugs



Any significance to this?
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