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Old 07-12-2020, 05:30 PM   #11
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Start the engine and warm it up until the water temp indicator shows something. Then check the Ignition Timing with a Timing Light. It should be 15 BTDC.

The engine should idle around 750 RPM. With the IACV-AAC sub-harness disconnected, you should have the idle adjusted to 700 RPM.

Make sure your engine ground is connected.

If all of that is good, I'd suggest looking to make sure you didn't reconnect one of the vacuum lines backwards.

Another thing to check would be the exhaust. One of the steel pipes could be crushed or the CAT may have gotten clogged during all that work you did on it. I'm just grasping at straws on that, though.
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Old 07-12-2020, 06:20 PM   #12
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15 is for the V6. The KA is 10
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Old 07-13-2020, 06:21 PM   #13
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Thanks JP - will check the timing as noted. I also checked all the plugs for the heck of it - they look perfect. I replaced everything behind the Cat recently as well, but like I said before, the truck ran perfectly for months after I did all that initial work (2 vacuum leaks fixed, new TPS, new MAF, new air temp sensor, new tail pipe and muffler). Took her out a few weeks back for a wash and when I got done, I took a drive to dry it off. A block from the house, she stumbled hard right when I shifted to 2nd, caught back up briefly, stumbled again and then wouldn't rev past 1,300.

I'll check the timing and report what I find. I'm starting to think this is a sensor issue of some kind, but it's curious that you mentioned a crushed pipe. The pipes are fine, but what are the odds that the Cat is stopped up?
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Old 07-13-2020, 08:40 PM   #14
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It sounds like your wash job blew a vacuum hose off.

Take the air cleaner off and see if the little vacuum hose under it is still attached.
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Old 07-14-2020, 12:56 AM   #15
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Quote:
Originally Posted by jp2code View Post
It sounds like your wash job blew a vacuum hose off.

Take the air cleaner off and see if the little vacuum hose under it is still attached.
Or your wash job got water in your distributor cap.
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Old 08-01-2020, 06:29 PM   #16
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I believe I may have found the problem. So as I've stated, the truck cranks and idles fine, but I have been noticing timing chain rattle upon startup that goes away after a few seconds. I decided to pull the rocker cover and have a look and when I did, I found that the driver's side chain guide had come apart. There was one chunk of the plastic insert wedged at an angle on top of the metal guide that it fits in. I was able to retrieve that chunk with a set of hemostats, but there doesn't appear to be any of the guide left that I can see. I'm now going to do a tear down and replace the timing set (and clean out the oil pan) but my question is this: would that guide coming apart like that be enough to affect my timing in such a way that the engine wouldn't rev up?
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Old 08-01-2020, 07:44 PM   #17
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would that guide coming apart like that be enough to affect my timing in such a way that the engine wouldn't rev up?
Moot topic right now. If you don't fix the guides, you could jump time and destroy the engine.

Fix the timing chain problem first. Most people go ahead and put on a new water pump, thermostat, oil pump, radiator hoses, and accessory belts.

Pay careful attention to how the distributor shaft lines up. If you get that just a cat hair off, the engine won't crank.
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Old 08-01-2020, 08:08 PM   #18
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Quote:
Originally Posted by jp2code View Post
Moot topic right now. If you don't fix the guides, you could jump time and destroy the engine.

Fix the timing chain problem first. Most people go ahead and put on a new water pump, thermostat, oil pump, radiator hoses, and accessory belts.

Pay careful attention to how the distributor shaft lines up. If you get that just a cat hair off, the engine won't crank.

Oh I plan to do all of that - already ordered the parts. I was just curious as to how much it would affect timing and if it would be enough to make the engine act like it is acting now. I assume too much slack in the chain would retard the timing, no?
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Old 08-01-2020, 08:19 PM   #19
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If it slipped enough to cause the engine to get out of time, it could. Who knows? It's hard to diagnose how an engine is going to run with faulty parts.
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Old 08-07-2020, 06:09 PM   #20
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Okay, I'm putting the truck back together today after replacing the timing set. The question I have is this: where do all these o-rings that came in my kit go? The only 2 that came off that I've seen are the two on the lower left side (looking at the front of the engine) that seal the water passages. Somebody else in another thread posted about one on the distributor, but what about the others? There were 4 rubber o-rings in my kit in addition to the other seals and gaskets.
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