I think I broke something :-(

12secondSY

Syty Killer :(
Last night me and 2 of my friends who are both a couple crazy bastards I ride with were going out to the comedy club. We take the Ty since they dont have vehicles capable of holding more than 2 people. It was running great last night. Still not perfect but closer than its been since the new engine. We hit the interstate and I proceed to scare the shit out of these guys. Speedo was buried, we were doing well beyond what it reads Im sure. I pass a semi at the last minute and take the offramp we need(thank you LS1 brakes for making that possible :D ). My friend is screaming from the passenger seat about to piss himself(I know this because he said "Im gonna piss myself"). Toward the bottom of the onramp the truck starts to spit and sputter. I think at first its fuel slosh since I had under 1/4 tank but it never went away. I put more gas in it on my way to work and still didnt help. It feels like a dead miss on a couple cylinders and it backfires. Good thing we are slow at work I guess. I might not be getting paid but I have time to work on my Ty :tup:
 

hatrik8

Donating Member
Re: I think I broke something :-(

Buried speedo might have caused problems. Cross your fingers.
 

bezerk

New member
Re: I think I broke something :-(

1/4 of a tank and drive it like you stole is a reason things break...do a compression check, and check your timing
 

12secondSY

Syty Killer :(
Re: I think I broke something :-(

Found one problem. My computer is on the passenger floor so I can swap chips easily for now. My scared buddy kicked it and bent up all the pins on the chip. Hopefully thats all there is.

I also heard some noise under the hood and found that its an exhaust leak. The bolts backed out of the wastegate and the gaskets are gone. This happened to me last year before I blew it up too so I put in new bolts with loctite and new gaskets. Guess I should have retorqued them after driving it a couple times :(
 

mandingo

She's an Alcoholic
Re: I think I broke something :-(

Well at least your a GM tech, if anyone can find and fix the problem, im sure you can :tup: And at least your friend only kicked your chip and didnt pee in your truck :drinking:
 

jjorgensen52

NHSTE - I'm the only one!
Re: I think I broke something :-(

you check the plug wires? I've had mine back themselves off before when I didn't get them seated 100% properly and then proceeded to beat the truck a bit
 

QWERTYphoon

Motley Driver Award 2009
Re: I think I broke something :-(

There are wires that go threw the fire wall in the passenger floor. There should be a plastic cover on the group of wires preventing someone from smashing the wires into the firewall with your feet. Your buddy might have broke wires there if no safety cover or the cover was knock off. I found this problem for somebody else and it took and hour to fix, not a biggy. The computer is available at auto zone for $100 and the MEMCAL chip is ....well.........good luck!
 

12secondSY

Syty Killer :(
Re: I think I broke something :-(

Fixing the chip didnt cure it. It feels like a dead miss and the A/F meter is reading richer than usual (12:1 or in that range cruising, jumps richer on light accel). I'll look at it more tomorrow, today I decided to get the bike at lunch and work on it all day since I have a big ride to go on sunday.
 

bezerk

New member
Re: I think I broke something :-(

yes, the way you discribed it, and the 1/4 off a tank and doing WOT for a period of time is BAD..sorry man, but i think you blew your motor...check your plugs, or take your wires off one by one while the engine is running, and you will prolly find one bad cilinder...take that plug out,
 

12secondSY

Syty Killer :(
Re: I think I broke something :-(

Pulled a plug, found this on #5

042807_17171.jpg

Ground and the porcelin are gone


Put in a new plug, still missed. I took it to work a few blocks away since thats where my compression tester was and that cylinder has no compression. Time to start taking it apart :tdown:
 

warmpancakes

New member
Re: I think I broke something :-(

12secondSY said:
Pulled a plug, found this on #5


Ground and the porcelin are gone


Put in a new plug, still missed. I took it to work a few blocks away since thats where my compression tester was and that cylinder has no compression. Time to start taking it apart :tdown:

pull the valve cover first and wack the springs with a mallet to be sure its not just a stuck valve
 

jwaller

Evil Genius/SyTy Guru
Re: I think I broke something :-(

detonation wil break plugs. but also breaks about everything else too so you might have tossed a piece of piston to break the plug. also check your turbine wheel for damage that could have gotten out the exhaust
 

12secondSY

Syty Killer :(
Re: I think I broke something :-(

jwaller said:
detonation wil break plugs. but also breaks about everything else too so you might have tossed a piece of piston to break the plug. also check your turbine wheel for damage that could have gotten out the exhaust
Thats what Im scared of. I let my dad drive the truck one day to the harley dealership and on the way back he put gas in it for me but he put in caseys gas(89 octane) and I forgot that he told me that until this happened. He told me while I was working on the bike and I usually ignore people if Im busy. Im getting no smoke out of the tailpipe or anything though so it cant be as bad as last time I killed a piston.

After I get this thing fixed Im really tempted to just sell it. Theres more that I want to do but I'm tired of dumping every penny in it. I need to buy a house anyways. I wouldnt mind having a stock lower mileage Sy later. I can make my 2wd blazer fast a lot cheaper than I can one of these if I really need to have a fast vehicle too.
 

12secondSY

Syty Killer :(
Re: I think I broke something :-(

warmpancakes said:
pull the valve cover first and wack the springs with a mallet to be sure its not just a stuck valve
Will do. Wouldnt that be nice if it worked.
 

Nova67ss

New member
Re: I think I broke something :-(

You might "just" have burned the exhaust valve, and If U are use to it or have someone who can help U do a leakdown test.. thats gona get U going in the right direktion pretty fast
 

GM TURBO

Sell Out
Re: I think I broke something :-(

12secondSY said:
After I get this thing fixed Im really tempted to just sell it. Theres more that I want to do but I'm tired of dumping every penny in it.

Let me know....
 

GM TURBO

Sell Out
Re: I think I broke something :-(

Well - if I was going to buy a truck might as well be one I know a lil something about.

Just throwing it out there.
 

12secondSY

Syty Killer :(
Re: I think I broke something :-(

Nova67ss said:
You might "just" have burned the exhaust valve, and If U are use to it or have someone who can help U do a leakdown test.. thats gona get U going in the right direktion pretty fast
I went to do a leakdown test by just hooking up some air to my compression tester monday, but the coupler on the air hose in the shop wont fit the fitting on the tester :( Oh well, I guess no matter what it is it has to come apart to fix it anyways.
 
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