Marc's 1990 4.2L V8 Twin Turbo Coupe Quattro

Jonathan · Post by **Jonathan** » Sat Oct 18, 2008 11:37 am

Cool. I welded an appropriate nut onto the two I removed from MC engines, threaded in the shaft of the shop slide hammer and popped them out.

Post by **Marc** » Wed Oct 22, 2008 11:07 pm

So I've had some random misses while revving at high rpm and suspected it was crank trigger related since my AIM dash would flash the shift lights as if I had brought the car to redline but this was well below that where this was occuring, around 4500rpm or so. I finally got around to logging it and sure enough WDBG was jumping around during the miss. Checked sensor gap, looked good. Replaced crank sensor, problem still there. Over time it started getting worse, so I spent some more time looking at the issue.

Once before when I was running 034 on my wagon the car would not start one morning after it had been sitting for a while and I discovered it wasn't reading any crank triggering at all. I checked the crank pulley and noted it had a lot of surface rust on the teeth so I brushed it up and voila, the car started.

So I thought perhaps something similar in this case? Problem is the pulley is not exactly easy to get to on the v8 since the radiator is so close. I managed to get in there with my long reach head porting tools to clean a few of the teeth at a time so I could bump the starter and get all of them. Problem seems cured, knock on wood... Hope so, cause I've got Watkins Glen with the audi club this weekend :-P

Post by **Marc** » Wed Oct 22, 2008 11:10 pm

while I was at it, I also wanted to figure out why my HVAC blower switch stopped working completely. All the connections were good so I checked the fusebox. Hmm, #17, lets see, can anybody spot it?

hmm, somethings not quite right there

PSA: its ok to buy tools from harbor freight, but refrain from buying things like fuse kits. mkay?

quattro87 · Post by **quattro87** » Thu Oct 23, 2008 12:22 am

Hmm, #17, lets see, can anybody spot it?

Nope...it looks like it is gone, as in up in smoke. LOL Did it actually melt the plastic or did you break the plastic trying to get the fuse out?

Jonathan · Post by **Jonathan** » Thu Oct 23, 2008 4:41 am

quattro87 wrote:Did it actually melt the plastic or did you break the plastic trying to get the fuse out?

I am pretty sure I see a pool of plastic (black?) at the base of the fuse. I'm glad I have oodles of good, used VW fuses on hand.

pro_mtn_biker · Post by **pro_mtn_biker** » Thu Oct 23, 2008 4:45 am

Harbor Freight fuse kits are extremely dangerous! I've seen 10amp fuses support 30+ amps before popping.

BarTender · Post by **BarTender** » Thu Oct 23, 2008 5:31 am

Marc,

Good to hear you got the beast's hiccup solved.

Guys, I got a ride in this car and its impossible to describe the noise and feel of Marc's coupe. There aren't enough superlatives so I'll just say I want one, I NEED one..... I just need to convince him to do it all over again.

Buying 100 lottery tickets today :-)

Quattro Krant · Post by **Quattro Krant** » Thu Oct 23, 2008 6:29 am

marc, you're number 17 fuse looks like my #5 holder on my beater 4000Q. In order to get the fuse to work, I have to bend the tabs of the fuse so they touch whats left of the metal in the fuse block, good stuff :bashtard: I really would like a ride in this beast at Carlisle this spring, or, perhaps if you have a beer or too, I could pilot it

Post by **Marc** » Sat Nov 08, 2008 10:38 pm

started putting the heads back together tonight but I've got a problem. there is a part in the bags I put together when I stripped them down last year that I dont recognize!! Cant find it in etka either. Looks like a mini-lifter but for the life of me I dont remember removing it. Bueller? (lifter for scale)

Post by **HT Motorsport** » Sat Nov 08, 2008 10:44 pm

Just one of them Mark, not 2? (I have no Idea what that is BTW, but if only one not 2 probably means something

Post by **Marc** » Sat Nov 08, 2008 11:02 pm

I just checked. one. and it was in the bag marked for the passenger side head.

naudi80quattro · Post by **naudi80quattro** » Sat Nov 08, 2008 11:14 pm

looks kinda like a cap that would sit under a cam that is if the top was shiny. :?

Post by **Marc** » Sat Nov 08, 2008 11:16 pm

naudi80quattro wrote:looks kinda like a cap that would sit under a cam that is if the top was shiny. :?

top is shiny. definitely looks like a mini-lifter in that regard, so it likely sits under a cam but there is no hole for it that I can find.

yodasfro · Post by **yodasfro** » Sat Nov 08, 2008 11:20 pm

Look like the center to a lifter but not a v8 lifter.

Toxcheap · Post by **Toxcheap** » Sat Nov 08, 2008 11:30 pm

looks like the oil squirter jet for the head
In my head 20v it actually blew out once and got cut in half by the cam, I found it in my oil pan after searching for loss of oil pressure. it was easy to replace.

yodasfro · Post by **yodasfro** » Sat Nov 08, 2008 11:34 pm

Center of 5 cyl. lifter for reference :wink:

Attachment ( 13975 ) : Picture 130.jpg

Attachment ( 13976 ) : Picture 126.jpg

Post by **Marc** » Sat Nov 08, 2008 11:37 pm

Yoda, I think you hit the nail on the head. I did take apart a pair of junk lifters that Janis gave to me for the flow bench rig used to set the valve lift points. maybe it fell into my bag of parts? that pic looks just like it. Thanks!

yodasfro · Post by **yodasfro** » Sat Nov 08, 2008 11:43 pm

That's exactly what I hypothesized when going back a few pages in the thread. :-D

naudi80quattro · Post by **naudi80quattro** » Sun Nov 09, 2008 12:15 am

looks kinda like a cap that would sit under a cam that is if the top was shiny

my mistake i mixed up the 2 parts

MikkiJayne · Post by **MikkiJayne** » Sun Nov 09, 2008 7:13 am

It doesn't look like anything I've ever taken out of a 16V head, so I'd concur on the 'part of a lifter' hypothesis :thumbup:

Post by **Marc** » Tue Dec 09, 2008 11:09 pm

valvetrain is back together, pulled the crankcase breather plate off the short block, I'll probably re-use the 3.6 intake manifold and modified breather plate off my current motor. Any reason I cant do this?

heads may join block this weekend. :woowoo:

3bAudios · Post by **3bAudios** » Wed Dec 10, 2008 8:14 am

:woowoo: nice work Marc

a_CQ · Post by **a_CQ** » Wed Dec 10, 2008 8:14 am

About time...

RSCoupe · Post by **RSCoupe** » Wed Dec 10, 2008 9:05 am

:stupid:

:woowoo:

Derracuda · Post by **Derracuda** » Wed Dec 10, 2008 9:48 am

so is there going to be a live 4.2 by the spring time?