cylinder woes

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cylinder woes

Postby Tortron » 16 Jul 2005, 00:43

well i found today that if i remove my 2nd or 3rd spark plug lead it has no effect on the engine......... of course its missing a bit beforehand

so what the hell is happening i ask. im off to mess with it some more

this wouldnt have anything to do with the timing chain (cos that would be too much of an easy fix...)

theres plenty spark getting to the plugs (i found that out firsthand) so im at a bit of a loss of what it could be!

piston rings perhaps?
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Postby Tortron » 17 Jul 2005, 00:28

ok, i think it may be a head gasket, as the plugs are side by side
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Postby Doive » 17 Jul 2005, 00:40

Sorry mate, was thinking that as I was reading your description. Sounds like a breach between two and three, but may be worth cheacking for water in the oil/oil in the water to see if it has gone across a water way as well. Hopefully won't be too expensive to fix.
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Postby Tortron » 17 Jul 2005, 00:48

no water from what i can see, but where the rubber pipe joins to the top of the cylinder head was split around the clamp thing, so i cut and reatached that.




i can get a new head gasket set for about 40$ tho, just hoping its not something worse
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Postby Shoveitpusher » 17 Jul 2005, 08:16

check the compression on the 2 cylinders as well. could be rings, valves (are they opening) head gasket, piston. if the valves are working ok i think you'll have to have the head off to check all is well inside.
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Postby Shellysowner » 17 Jul 2005, 11:54

Hmmm, I have to say Torton I agree with Pete's more serious diagnosis. The good news is it provides a useful opportunity to do an engine re-build and squeeze a bit more power out of her :twisted:
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Postby TJM » 17 Jul 2005, 15:31

Do some simple checks first before thinking the worst. Some suggestions may sound obvious and I hope I don't insult your intelligence but even the best of us can make some stupid mistakes.

1. Are the leads on correctly - firing order 1-3-4-2?
2. Check inside distributor cap for damage to pickups.
3. I see you said you found out there was plenty of juice getting to the plugs. Did you get a shock of the ignition leads with the plugs still in and connected? If yes, change them if you think they are suspect.
4. Are the inlet and exhaust valve gaps adjsuted correctly HOT 0.2mm inlet and exhaust.
5. Before going for major things, ensure everything else is set-up properly.

Reply here with results.

If you need to check the compression of the cylinders, you will need a basic tollkit to remove the sparkplugs, compression tester, some engine oil and a pen and paper.

Remember all safety precautions before checking anything.

Disconnect the coil lead.

Disconnect cylinder one and remove plug. Fit compression tester, turn engine over and take a note of the reading. Remove compression tester, squirt a small amount of oil in the cylinder, replace compression tester and turn it over on the starter again. Make a note of the reading.

Do this for all other cylinders.

All cylinders ideally should be within approx 1.4 bar (20psi) of each other. If any of the cylinder readings increase after you squirt some oil in, suspect rings. If not suspect anything above block.

Std Compression (early engines) 9.7bar minimum
Std Compression (later engines) 9.0bar minimum
Low compression 8.3bar minimum
Engines from Sweden 8.6bar minimum
Maximum permissible variation between cylinders is 1.4bar (20psi)

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Postby Tortron » 18 Jul 2005, 07:18

yea, i changed all the leads with no effect, i also think its the valves aso im taking it in to get a compression test and see what i can do
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Postby Tortron » 19 Jul 2005, 04:27

alright, its just one its missing on. checked the 2nd one for compression the result was pretty much 0

likely burnt valves.

as long as theres nothing more wrong i can get it done for $400,(the other place said a minimum of 700)

oh well, guess il be waiting that little bit longer for that kombi.......
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Postby shuvit-tim » 20 Jul 2005, 02:12

i had that once on one of my essys i'd buckled the cam (no idea how!) and this had caused a valve to burn out which caused a miss and no firing on one of the cylinders
when all else fails, rivets, cable ties and bodge tape will see you through

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Postby Herbie_Flowers » 20 Jul 2005, 22:41

did it have a pinto in it?
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Postby Chevette Girl » 22 Jul 2005, 03:20


Do your models of Chevette have a crankcase ventilation system, y'know, feeds back into the air cleaner?

When my old baby's engine finally went (around 320,000 kms, 1 cylinder with no compression, one with half), it was making so much blow-by that the gas mileage picked up from the added oil vapours! Also, my mechanic showed me that the engine would stall if you plugged the ventilation, guess it built up that much back-pressure or something...

I never had it confirmed, but I'm presuming it was the piston rings. If it was just the valves, I wouldn't have expected the blow-by...

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Postby Tortron » 22 Jul 2005, 06:49

$300 all up to fix, vavle wasnt seated correctly/needed a grind. now shes running quite nicely
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