I have a 1994 S10 Blazer with the 4.3 Vortec. I Seafoamed the motor and took it out to "drive aggresively" as the instuctions state. I drove it a little hard and I was cruising at about 35-40 and punched it, it droped a gear or two, revved to about 4500-5000, and it shut off like a light switch. Just dead. Didn't make any weird noises, explosions, clunks, bangs, nothing. Just dead. It cranks but won't fire. No check engine light and its not giving me any codes. Did I maybe jump a tooth or two on the timing chain? Can someone lead me to a thread that details checking that the cam and crank are aligned properly and how to get to the timing chain, and how to replace it? I haven't had a chance to get to it yet, but I will be checking it for fuel, spark, and compression. I'm new to this Blazer thing, I'm used to wrencing on an old-school Jetta for the past decade. My dad is Mr. Car-guy and I picked his brain, but he's 110 miles away and is more into older (60's) Chevy small and big block/Ford flathead stuff, not the newer Vortec V6's (if you can call a 1994, "newer"). Thanks.

 

Damn how did you apply the seafoam in the intake top dead center with the aresal spray or to the tank oil and vacume line?? I did the spray top dead center on mine 93 cpi and had a real kicker geting it going took the plenum off and low and behold major gook cleaned the sh89 OUT OF it put new spider and nut kit and primary coil and now its running great...

 

Im guessing you probably just popped the injector hoses that have been old and junk for a while. Smell your oil, if you smell gas and its overfull you will have a big time leak inside the plenum. Not a big deal, these things go after 15+ years. It will cost your about 50-250 to fix it and you can do it yourself at home no probs. Its about 50 for the lines, and another 200 for an injector unit. The injector you have probably works fine and you would just need to change the lines.

Do a little easy diagnosis. Can you hear your fuel pump buzzing when you turn it on? Maybe if you put your ear down by the intake and listen when someone turns it on you can hear spraying or something weird inside? Borrow a pressure gauge from a friend and check it out too. Or just open up the plenum and have a look at the condition inside. If theres any gold coloring you have a problem, it should be black everywhere. Check it for spark too.

I doubt you jumped a timiing chain. That happens more on the DOHC motors that have a rubber belt or flimsy bicycle chain on them, not your iron V6 with a heavy duty quad link chain.

 

Yeah probably something simple - could just be a wire got loosened up while you were under the hood. Check battery connections, & the rest of the connections all around where you were working. Simple stuff first.

 

I fixed the problem. I couldn't believe what it was. I hag no spark. When I pulled the coil, I noticed one of the electrical connectors to it had come undone. Plugged it back in a boom, fired right off. I'd say it cost nothing to fix, but I spent $60 getting it towed home and missed a shift at work, so it actually cost me well over $100. Oh well, runs great now.

 

glad you got it fixed =)