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Old 02-18-2021, 11:52 PM   #11
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I'm def. up for it. It's so easy to get stuck on little things I don't know and I can tell this is a great community to help me keep moving forward. I'll run it and check temps on the catalytic converter tonight (as soon as I figure out where it is and which end is which).

It's be under the cab on the driver's side. Looks kinda like a muffler with heat shields. Inlet is motor side, out is two pipe side. Get the truck up to operating temp before checking. Check while it is running.



I like the idea of checking brakes for drag too but as it only happens under load, not coasting in neutral, it's probably not that.
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Old 02-19-2021, 01:14 AM   #12
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I like the idea of checking brakes for drag too but as it only happens under load, not coasting in neutral, it's probably not that.
What if it's a heat/time related issue? Gets warm and starts to get tight. Don't know, but this could be a possibility. Bearings?

The cat is also something to seriously consider. After 30 years.......

Heat's a killer.
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Old 02-19-2021, 03:14 AM   #13
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Only way I could see thermal expansion is if there is a lot of water in the brake fluid but then the brakes would also feel like poo. Brake fluid is pretty stable to pretty dang high temps. Water, no so much.
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Old 02-19-2021, 07:08 AM   #14
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If you want to check the cat get your hands on a thermometer. On a working cat the outlet will be hotter than the inlet.
I ran the truck about 20 minutes and put the laser thermometer on the pipe going into the catalytic converter, and on the pipe that carries exhaust out the catalytic converter to the muffler.

Intake pipe = 215-220 F
Outlet pipe = 195-205 F

Does that mean I should consider a new catalytic converter? I would think the part closer to the engine should be hotter, but I don't fully understand how a catalytic converter works.

Any parts recommendations or tips on getting the work done at a shop? There's a big range in price on the part, and I think this kind of job requires equipment and knowledge that I don't have.
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Old 02-19-2021, 04:09 PM   #15
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Thats a little cooler and a hair hotter on the inlet that I expected.



Do you have a vacuum gauge or a way to measure exhaust back pressure?



Do you do emissions testing? If not I'd just rip that thing out of there if it's coming out anyways.
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Old 02-19-2021, 07:40 PM   #16
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Thats a little cooler and a hair hotter on the inlet that I expected.



Do you have a vacuum gauge or a way to measure exhaust back pressure?



Do you do emissions testing? If not I'd just rip that thing out of there if it's coming out anyways.

I don't have a vacuum gauge and I don't know anything about measuring exhaust back pressure, but I'll add it to the youtube cue

The truck is currently registered in a place that doesn't require emissions testing, but I may want to register it in California in the future. It passed a California smog test in early 2019, but it didn't have this issue then.

A few people have suggested I replace the fuel filter which Idk if it's ever been replaced. I'm thinking of doing that, then seafoaming the crankcase and the gas tank to see if I can clear any possible clogs/crud in the fuel system or engine, followed by an oil change (it's not due, but maybe makes sense after a cleaning?)

Does that make sense? Any words of warning?
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Old 02-19-2021, 10:36 PM   #17
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Your first post you said this problem gradually got worse, but you also seemed to indicate it got far worse after your last oil change...?


You could buy some of that fuel injector cleaner for a couple bucks and put it in at your next fillup.
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Old 02-19-2021, 11:19 PM   #18
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You're in ID, @ what altitude? ...yea, above sea level. When the air is thin, the filter can make all the difference in the world. I spent 20 years @ 6500'+.

I didn't see any mention... when was the last time the air filter was changed? What filter did you use? Do you have a 2nd filter in the system? (look for it......)
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Old 02-19-2021, 11:22 PM   #19
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If you don't think the fuel filter has ever been done, do it. It's a cheap point of maintenance that often gets over looked.
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Old 02-20-2021, 07:27 AM   #20
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Originally Posted by 86.5D21SE4x4V6MT View Post
The resistance goes away when I take the car out of gear.
If your fuel filter is clogged, or your fuel pump is weak, there is a for-sure sign of that. You will have a miss at high freeway speeds, like 60-70 MPH. The miss happens because the engine is getting fuel-starved a little bit.

A miss going up a steep hill is usually a spark problem, or you need a tune up, etc.

You say the resistance goes away when you kick it into neutral? Well, that eliminates the rear end, the brakes, and anything from the tail of the transmission on back to the rear end.

Yeah. This sounds like something with the engine or the exhaust system all right. Not sure though. Some things I am good at with these trucks, others not so much. This could be one of those 'not so much' times. I wonder if its the catalytic converter, though. Sounds almost like some exhaust being restricted.
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