Engine blowing up, sort of.

TripleEight · Post by **TripleEight** » 14 Jan 2016, 00:19

Did my first compression test, I think I did it right, and here are the result.

1 92
2 92
3 89
4 120
5 87

From google search I'm guessing they are way too low...

I'm not sure if it was this low to begin with befor the stall

Post by **abscate** » 14 Jan 2016, 04:38

Yeah, these are really low. Was the engine spinning well with a good battery?

If the readings are true, all that blowby is probably the cause of your crankcase pressure

Post by **tryingbe** » 14 Jan 2016, 05:16

TripleEight wrote:im pretty much trying to get every mile out of it while it lasts.

TripleEight wrote:Did my first compression test, I think I did it right, and here are the result.

1 92
2 92
3 89
4 120
5 87

Sounds like the car has done its last mile. I'd cut my loses and move on, since the exterior and interior of the car isn't worth saving.

TripleEight · Post by **TripleEight** » 14 Jan 2016, 07:53

Yes the engine spins pretty freely with plugs in and especially with the plugs out, no odd noise.

Checked timing and it lines up perfectly fine.

I'm thinking the rings are cracked or something , as I'm getting a lot more blowby gas from the lower pcv hole and dipstick than the top cam cover hole.

Odd thing is how 4 of the cylinders went out At the same time...

Anyways
My lesson here was I should of checked compression before diving into the pcv replacement, but I did save a whole lot by not letting the AAA guys start troubleshooting it, beginning with the plugs, wires, and distributor kit for $850 smh. and was a good learning experience.

Unfortunately overhauling the engine is a bit out of my experience level. Even if I can fix it I can find a newer cleaner V70 for about $2000

I got a friend of a friend who's a Volvo tech, which I just found out, come by to do some tests in a couple weeks before I send it off.

Thanks guys

Post by **j-dawg** » 14 Jan 2016, 21:43

Put a tablespoon of oil in each cylinder and repeat the compression test. If compression comes up to normal numbers, you've identified the rings as the problem. The oil may also help you get the car started.

After that, open the garage door before you try to start the car again. When it fires, it will smoke.

TripleEight · Post by **TripleEight** » 15 Jan 2016, 13:48

Thank you for the tip, I'll try it tonight!

Post by **mecheng** » 15 Jan 2016, 14:27

When doing the test make sure you keep gas
Pedal floored to open up thottle body

TripleEight · Post by **TripleEight** » 16 Jan 2016, 08:06

So... the car lives to see another day...

...well, I'll have to see if it starts up again later.

First off, I couldn't accept the fact that all the cylinders where blown at once. Never seen that happen and I had a part of me thinking maybe I did the test wrong or the compression kit was broken, as it didnt hold the pressure too well and it looked pretty abused.

So i thought Id give it another chance, also wanted to try j-dawg's tip with a tablespoon of oil in the cylinders, to see if the compression would change and maybe, just maybe the car might magically start.

Having returned the compression test tool yesterday morning, i thought I'd do CN90s "Ultimate" PCV fix before i go rent another compression test tool later today. The PCV job was a breeze, took only 1/3 of the time compared to 2 days ago, where every bolt and hose were jammed or seized.
After putting everything back together I went ahead and added some oil into the cylinders and crank it so the oil will coat evenly for the compression test later. Took mecheng's advise and floored the pedal before turning the ignition thinking it was a "clear flood mode", and it started right up!
I immediately jumped out and took out the dipstick and oil fill cap, thinking its going to explode again but NO SMOKE!

So all i can think of is that the Autozone OEM compression tool was giving me wrong numbers. I've yet to check the wet compression of the cylinders but it seems to be fine.

What i dont understand is what made the car stop in the first place, as it was driving totally fine with the 95% clogged PCV and the narrow factory hose to the intake. No doubt, the "Ultimate PCV fix" was the answer all along.

Im just glad I went ahead and did the Ultimate PCV fix before I attempted to crank it for the wet test, because it would of definitely blew the seals out.

Thanks everybody for the support.

Post by **erikv11** » 16 Jan 2016, 09:51

Great you got it sorted out. What do you mean by the "Ultimate PCV fix," that you cleaned out all the ports and changed the parts?

Post by **j-dawg** » 16 Jan 2016, 10:31

You were "lawnmowering".

https://www.matthewsvolvosite.com/forums ... hp?t=61868

Glad you're up and running again.

Engine blowing up, sort of.

Re: Engine blowing up, sort of.