PDA

View Full Version : Car wouldn't start



Spectre1130
01-11-2017, 03:53 PM
Hey guys. I have a 1.8t Quattro. I went to change my oil on Tuesday and couldn't get my car to start at all. I checked fuel, spark, engine codes, then lastly compression. I got 60-60-105-30 for cylinders 1-4. I pulled the head and checked but the gasket did not show any signs of damage. I also noticed while pulling the head that the timing belt dampener did not seem to be putting any pressure against the tensioner pulley, and I was able to slip the belt off by hand. This lead me to check the pistons and valves. The pistons are new with only 15k miles on them and were covered in soft black sludge that i scraped off with a credit card, they also showed no signs of damage. The valves have around 190k miles on them and showed no damage. Also when removing the ARP head nuts they felt unevenly tightened (I followed ARP's torquing sequence) and some of the head studs were loose to the point where I could tighten them a whole turn by hand. I'm going to check my valves to see if they seal while seated later this week when I have time. Also, no oil in the coolant, but possibly oil in the combustion area.

Some fishy things leading up to this were:
-My boost gauge had me idling around 17-20 inHg after the build a few years back. The past year I had noticed at idle a lower and lower vacuum, until about a week ago when it was down to about 10 inHg.
-My car was noticeably more sluggish the past few weeks and worsened all the way til the end.
-My car started to produce blueish smoke the day before it wouldn't start.

I'm just confused because it started fine Monday night when I pulled it from my driveway into my garage, but the next day it didn't start at all. Also, even though I believe it is a faulty headgasket, it did not show any signs of damage. I guess I'm just looking for any other input as to what it may have been if not the headgasket. I would have thought if it was the timing being off, all cylinders would read relatively the same lower number.

RENOxDECEPTION
01-12-2017, 08:21 AM
Try squirting oil into the combustion chamber and doing a compression test again.

If the numbers go up, this will tell you that your rings are bad.

If they don't change, then you can suspect HG or valves.

Spectre1130
01-12-2017, 06:20 PM
Try squirting oil into the combustion chamber and doing a compression test again.

If the numbers go up, this will tell you that your rings are bad.

If they don't change, then you can suspect HG or valves.

Rings only have 15k miles on them. I just assumed they weren't bad, hope that doesn't bite me in the butt. I probably jumped the gun without doing a wet test or a leak down test.

Today I took a straight edge to my cylinder head. No warpage. I pulled the cams and tappets, flipped it over and checked valves for leakage. I will upload some pics and a video in a second.
https://scontent.xx.fbcdn.net/v/t1.0-9/15977734_10210693705555174_5245624101278321376_n.j pg?oh=3b61e814a832e97fb24bb6f671e210f2&oe=591B1736
https://scontent.xx.fbcdn.net/v/t1.0-9/15941257_10210716622888093_4412715870722763722_n.j pg?oh=7a8918f89633a79a3425781c71015c64&oe=591A919A
https://scontent.xx.fbcdn.net/v/t1.0-9/15439933_10210716623088098_4272248457846466445_n.j pg?oh=455041fcdb7b6d866f6b2ee04cb0cc02&oe=5911E059
https://scontent.xx.fbcdn.net/v/t1.0-9/15940952_10210716623248102_2866655311055589255_n.j pg?oh=aefd5560a1387b00f776ccbb968ec85a&oe=58DA93C1

video

https://youtu.be/bgPW6inEC7M

Seerlah
01-12-2017, 07:36 PM
Clean the short block surface really well, put head back together, bring head to machine shop, pressure test, look over, deck, and reinstall.

RENOxDECEPTION
01-12-2017, 07:41 PM
Oh, you're on Facebook.

Spectre1130
01-12-2017, 07:46 PM
Clean the short block surface really well, put head back together, bring head to machine shop, pressure test, look over, deck, and reinstall.

It doesn't need to be decked though, does it? I checked different axis' with the straight edge and a feeler gauge and it was all good. And I already know the valves are leaking by from the video. Should I just do a lap? I went into more depth with some questions on my build thread that I revived. http://www.audizine.com/forum/showthread.php/554783-Swapping-in-AWM-block-w-AEB-head-also-manual-trans-swap


Oh, you're on Facebook.

Yeah. Posted there first, then figured I would come here since the forums are better.

RENOxDECEPTION
01-13-2017, 09:04 PM
Are they OEM valves?

Spectre1130
01-14-2017, 02:43 PM
Are they OEM valves?

Yes. I ended up just dropping it off to a machine shop and they are going to check it, grind the seats, clean valves, and deck the head. If they find a bad valve or guide they will tell me, which then I will probably get Supertech's. They are a shop I trust and have worked with alot when I worked for a performance shop.