compression tested

[1988G1]

i guess its time for a new heart for my legend. cly 1,2,3 gets 80 compression and 4,5,6 is at 100. i gotta make a trip. wasington to cali. what you guys think.

[kongbuiltt]

I would not.

[awelliott]

It would be nice to have more info, such as how it is currently performing, oil consumption, etc. However, considering the info given, I don't think it's that risky - just keep an eye on the oil level and don't drive like a maniac. Good luck...

[Djets]

I agree, more info would be good. But, 80 psi on one bank and 100 on the other is 20% difference instead of the desired 10% rule in compression testing an engine. And that rule usually refers to comparison of cylinders, not banks of an engine.

Even if I didn't have antifreeze in my oil and it was still running, I would be saving the cash for future work; heads or a 3.5 swap that is. We've seen the 3.2 just can't tolerate an imbalance and usually results in the BHG. The 3.5 swap seems to be the better option for most. I'm going there soon, as I'm not going to pay for a second BHG on my 3.2. My 2 cts.

You are in the right forum for any help you might need my friend. Good luck to you no matter what the decision.

Don

[1988G1]

thanks for the reply guys. i know for sure i dont have a BHG. oil, coolant, and temp is fine. i do know my rear motor mount is bad. the mechanic said my timing belt might of jump a teeth. what kinda of damage can cause if it did jump a teeth on the timing belt? oh and my ecu is reading that my bank2 o2 sensor is bad but no engine light on. yes i have replace it with a new one. ecu is still saying its bad.

[awelliott]

Originally Posted by 1988G1

thanks for the reply guys. i know for sure i dont have a BHG. oil, coolant, and temp is fine. i do know my rear motor mount is bad. the mechanic said my timing belt might of jump a teeth. what kinda of damage can cause if it did jump a teeth on the timing belt? oh and my ecu is reading that my bank2 o2 sensor is bad but no engine light on. yes i have replace it with a new one. ecu is still saying its bad.

What's with the timing belt - is your mechanic saying that the timing belt slipping a tooth is the cause of the low compression? In any event, if the timing belt is the least bit suspect, then I'd have it investigated further. If it has slipped one tooth, what's to stop it from slipping several teeth? If it does that, then it's new engine time because these are interference engines and the pistons will adjust your valves the hard way.

The timing belt is a game changer. I wouldn't take a trip unless I ruled it out. If the timing is off, then I suppose you could correct it and see if it improves the compression - if so, then you could replace the belt/tensioner/water pump if it's due. If you set the timing and the compression is still low, then I wouldn't bother with the expense of replacing the belt since you have major internal engine issues. You could also investigate the cause of the low bank further by doing a leak-down test. However, the fact is that the readings on your "good" cylinders aren't so hot, so it might be a waste of time.

[l4zy415]

Originally Posted by Djets

I agree, more info would be good. But, 80 psi on one bank and 100 on the other is 20% difference instead of the desired 10% rule in compression testing an engine. And that rule usually refers to comparison of cylinders, not banks of an engine.

Even if I didn't have antifreeze in my oil and it was still running, I would be saving the cash for future work; heads or a 3.5 swap that is. We've seen the 3.2 just can't tolerate an imbalance and usually results in the BHG. The 3.5 swap seems to be the better option for most. I'm going there soon, as I'm not going to pay for a second BHG on my 3.2. My 2 cts.

You are in the right forum for any help you might need my friend. Good luck to you no matter what the decision.

Don

hgeez: I bet you didn't realize you were in the G1 section eh? lol

[JKLedbetter]

The fact that the compression is different between banks, and the mention of the timing belt maybe slipping a tooth suggests that the timing may have slipped on the rear cam (or slipped more on the rear cam) and correcting it may improve things. I second Tony's recommendation that you thoroughly investigate the timing belt before starting on a long trip. Do you know how many miles/years since the timing belt was changed?

-Kennon

[1988G1]

i found jdm motor for sell local. they want one for 5oo bannana. what you guys think. let me know. so i can start the heart trans plant. what do i look for as legit jdm.

[uniquelegend]

Originally Posted by 1988G1

i found jdm motor for sell local. they want one for 5oo bannana. what you guys think. let me know. so i can start the heart trans plant. what do i look for as legit jdm.

lol, tell them to open up the valve covers. 500 is a good deal if they ship free or maybe you can pickup. dont forget to ask if they have a warranty and if the motor been compression tested with proof.

good luck, i wish i could be there.