Caput 4.0

[XJMarsbar]

Originally Posted by rastus2571

Optical, give it a second test and give us the results. Some cheap compression gauges stick on the first bang and show good after being used. I'm intrigued how 25 on no1 then spec compression on the others that it's not running or driving like a bag of shit. The best compression testers are the screw in type into the plug thread. On another note, what procedure did you use when you did the test? Throttle full, crank until maximum pressure on gauge was showed?

Amen........I'm surprised it isn't driving like a wet T-shirt & missing/ back firing or igniting the fuel vapor in the exhaust if valves leaking.

I'm looking forward to hear what the final diagnoses is..... Good luck

AL

[layback40]

Originally Posted by rastus2571

No1 plug can still be clean and firing even without compression.

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Correct Rastus. If you have a ring problem you will get an oily plug. Either all plugs will be oily from blowby or #1 will be oily from oil coming up past the rings. Burned exhaust valve has biggest effect at idle. At normal engine speed you dont notice it.

[optical]

Some good info here gents, thanks!

Being a 'toy' I'm not rushing with anything as I gave a few other modes of transport.

Spew about the motor / year changes. More then I expected.

Re comp test. All plugs out, ignition and fuel relay out, screwed in comp gauge and cranked about 6 times. Did all pots and even did number 1 twice to confirm.

It idles ok, but you can feel a minor shake and the exhaust note is lumpy at idle (like big cam) - driving at any rpm off idle it's fine.

Wierd

[cruiserfied]

Originally Posted by optical

Some good info here gents, thanks!

Being a 'toy' I'm not rushing with anything as I gave a few other modes of transport.

Spew about the motor / year changes. More then I expected.

Re comp test. All plugs out, ignition and fuel relay out, screwed in comp gauge and cranked about 6 times. Did all pots and even did number 1 twice to confirm.

It idles ok, but you can feel a minor shake and the exhaust note is lumpy at idle (like big cam) - driving at any rpm off idle it's fine.

Wierd

What did your new readings tell you?

[rastus2571]

Sounds like it's time then to do a cylinder leakage test before you start tearing it apart. It's going to have to come apart anyway but the test will show a more definitive result. I'm hedging on an exhaust valve being damaged or the valve seat itself. If it is an exhaust valve you will hear air coming out of the exhaust pipe.






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[optical]

cruiser, the second test of number 1 resulted in the same figure
1 - 25
2 - 145
3 - 145
4 - 160
5 - 165
6 - 175

wierd how they scale up like that...

[optical]

rastus - not sure what to do atm regarding the engine

it seems unless i can grab a used '01, im going to be up for some big coin for a reco / remanufactured