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Just a bad wire


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Things are not looking good.

Oh, it needed all of the ignition parts, but the symptoms are even worse with the new stuff installed. I'm thinking timing chain or cam.

I am holding out a small hope that a clogged fuel filter is responsible - but I doubt it.

The Tahoe may be dead.

Right now, it is undriveable.

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Yeah the alternative like my 1994 ROPOS reliable 330K mi 1500 is lo compression on one cylinder. It has a slight miss at idle but not above idle its a slow death I pray for not a sudden one.

Your doing better than the Fords...we've had thee Ford work trucks blow up within the last week...a diff..a motor...and another motor. (one motor is just a 5.4 that blew out a plug but...still)

Things are not looking good.

Oh, it needed all of the ignition parts, but the symptoms are even worse with the new stuff installed. I'm thinking timing chain or cam.

I am holding out a small hope that a clogged fuel filter is responsible - but I doubt it.

The Tahoe may be dead.

Right now, it is undriveable.

This has been a really crappy two or three weeks for me also....starting a "bitch" thread so we can all commiserate...

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Had to rush and make the wagon legal so I have something to drive. A former GM tech friend of mine is coming by tomorrow morning to help me diagnose the Tahoe.

But I'm not optimistic.

Hopefully the wagon won't be going through a pee ayy winter...

But then again....ughhh...is the RPOS drive able?

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I just bought a decent 97 Chevy Astro cargo van that runs well...if you can make it to Ohio, i might be able to arrange a "loaner" to keep the wagon from being destroyed.

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Things are not looking good.

Oh, it needed all of the ignition parts, but the symptoms are even worse with the new stuff installed. I'm thinking timing chain or cam.

I am holding out a small hope that a clogged fuel filter is responsible - but I doubt it.

The Tahoe may be dead.

Right now, it is undriveable.

1.) Timing chain will affect all cylinders equally

2.) Cam could be responsible but you'd hear a bad lifter and a roller cam seldomly wipes out a lobe.

3.) Fuel filter will also affect all cylinders equally in all but the most worst case which might be a semi plugged injector, also the fuel regulator could mimic the bad pump.

4.) If popping through the intake that valve is bad

5.) Ditto with exhaust hold a dollar bill(any denomination you wish :smilewide: )& if it sucks the bill into the pipe then bingo it's a bad exhaust valve.

6.) A bad orplugged injector will cause a miss even if the compression is showing good

7.) Low compression not caused by the valves would be a hole in the piston or broken rings which can be determined if you have excess crankcase pressure(pull the PCV valve from the valve cover

That should be it with the possible problems or as in my case worn out engine but I think yours doesn't go away. Best of luck to ya Camino

Things happen for a reason... FIVE SEVENTY-TWO!!!;)

Sorry, Camino, you know me, just trying to make a smile. I hope it's not as bad as you fear, sir.

572??????? :confused0071:

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After checking a bunch of possibilities, the consensus is that the timing chain is shot. We put a timing light on it and it runs best way away from the timing marks - only one thing can really be resdponsible for that.

So, with its other issues, age, and miles, I had to call it. Time of death for that engine: about 1:00PM EDT.

Now I have to think about what to do.

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I'm sure if you go to a junkyard you can't swing a dead cat without hitting something powered by a Vortec 5.7.

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Oh come on, even I can do a timing chain on a north/south chevy pushrod....

It also needs valve seals, has questionable head gaskets, 200k miles...

Not worth it.

Yeah...and a junkyard three fifty will cost 6 to 8 hundred, and be of questionable value.

I just checked and the prices on these have gone WAY up!

Even gmpartsdirect.com wants 2k for this engine.

GM part # 12568758

Hope you get some good plowing jobs this winter...

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How good are you at rebuilding engines? I only ask because you could save yourself a lot of money and do the hard work yourself

While you've got it apart, throw on a new timing chain and call it a week.

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After checking a bunch of possibilities, the consensus is that the timing chain is shot. We put a timing light on it and it runs best way away from the timing marks - only one thing can really be resdponsible for that.

So, with its other issues, age, and miles, I had to call it. Time of death for that engine: about 1:00PM EDT.

Now I have to think about what to do.

Not trying to be a smart a$$ but did you pull the timing service pigtail on the firewall before checking timing?

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After checking a bunch of possibilities, the consensus is that the timing chain is shot. We put a timing light on it and it runs best way away from the timing marks - only one thing can really be resdponsible for that.

So, with its other issues, age, and miles, I had to call it. Time of death for that engine: about 1:00PM EDT.

Now I have to think about what to do.

Not trying to be a smart a$$ but did you pull the timing service pigtail on the firewall before checking timing?

Never even heard of it, would it give me a dramatically false reading? No such animal on anything I've ever used a timing light on.

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Well, I sure can't find the connector they are talking about.

The emissions label reads like it is one of the connectors to the distributer - but that doesn't work.

So where exactly is the damn thing?

At any rate, a further observation with the timing light is that the timing is jumping all over the place constantly all on its own.

Still makes me think timing chain.

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OK, found it.

Get this: It is a tiny connector, completely taped over, taped to a huge wire loom, behind the glovebox!

WTF!

Got it disconnected, set the timing (didn't jump all over anymore, ran smoother but still belched through the intake and exhaust. So I shut it down, re-connected the lead ran it a bit (noting that the computer radically changed the timing), and the symptoms remain.

At least it is easier to limp around the driveway now.

Still looks like the timing chain.

Oh yeah, you have to remove the glovebox to access the connector.

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Reliable ROPOS's wire was already hanging down sorry you had to search so much. now I might've missed it but this is first I've heard that it's coughing through the throttle & exhaust. Before you condemn it pull the valve cover on the low compression cylinder or both if you don't have a compression tester & look for broken rocker arm's or bent push rods. the rockers won't break due to timing chain on an engine that still runs. The push rods would probably indicate a stretched timing chain that jumped. really the timing chain is an easy fix and the engine should at least have 100K mi left before needing a complete rebuild. That should last your plowing years no sweat.

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I am pretty sure that a stretched timing chain is the culprit here. The idea of tearing all that stuff off of the front of the engine (when I've already done a PS pump and a water pump} isn't too appealing on an engine that also needs valve seals and should have the intake gaskets done.

If I do go that route, all three jobs will get done at once.

Ugh. Lotsa crap to get out of the way to do those jobs on an engine I have little faith in.

Still, the parts will only come to a few hundred bucks total.

The hassle factor is huge though - lots of hours and lots of disassembly along with lousy access. If I did all that, and the engine lets me down, I'll be seriously bent.

But I'm thinking about it.

Edited by Camino LS6
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