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Old 06-06-2021, 07:46 PM   #1
lrbraner
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2002 L-Series 3.0L Sedan
2003 L-Series 3.0L Wagon
Default Thermostat and more

My 02 L300 with 201K on it has had a couple of ongoing issues.
Most notably a recurring P0128 code along with not ever reaching temperature.
Then the front bank cam cover started leaking a bit.
Intended to "someday" address these issues.
Then started getting frequent bank 2 misfire codes.
SO..... Decided it was time to attempt to fix these issues.
Now 9 hours later i have everything removed, ready to clean up and start re assembly.
One of the biggest challenges was getting the thermostat extension tube out.
Could not see a way to do it without removing the P/S line from the pump.
Problem was the line didnt want to cooperate. Finally got it.
So some observations and questions.
The plugs arent that old , but they are not oem. They are Autolite !!!
A couple of the plug wells had considerable oil in them.
I think that may be the main problem for the misfire.
The thermostat does not appear to be stuck open as I had expected ???
And last is there a compelling reason to replace the thermostat housing ?
Or just replace the thermostat ?
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Old 06-07-2021, 08:00 AM   #2
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2003 L-Series 3.0L Sedan
Default Re: Thermostat and more

Check your owner's manual for spark plug recommendation. It's always better to stay with factory recommended plugs. With rare metal tipped electrodes lasting 100k miles, experimenting with other plugs is at your risk of future problems. Mine looked new when replaced, testament to platinum tipped electrodes.

When P0128 occurred during winter season, I had heat but to ensure heating I used plastic cardboard blocking off about 1/4-1/2 of the radiator, resetting the error code periodically until spring came to replace the t-stat, including housing. The mounting ears on the new housing required longer bolts. No explanation was given about replacing the housing. The error code is about the t-stat running cooler (opening sooner or stuck slightly open) as the ecm detects operating temps not occurring fast enough, taking longer than programmed expectations. I think this is part of emissions controls; getting up to operating temps sooner allows transitioning from rich (polluting) to lean fuel mixtures while waiting for the O2 sensor to heat up to switch from open to closed loop mode of emissions control.

P0128 appears to be a faulty t-stat in most models when mistakenly replacing the coolant sensor didn't correct the problem.

I'm not entirely familiar with can covers leaking oil into plug cavities and presume it's due to worn seals between cam cover and flats on the cylinder heads for each spark plug boss.
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Old 06-08-2021, 07:24 PM   #3
lrbraner
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2002 L-Series 3.0L Sedan
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Default Re: Thermostat and more

Quote:
Originally Posted by fdryer View Post
Check your owner's manual for spark plug recommendation. It's always better to stay with factory recommended plugs. With rare metal tipped electrodes lasting 100k miles, experimenting with other plugs is at your risk of future problems. Mine looked new when replaced, testament to platinum tipped electrodes.

When P0128 occurred during winter season, I had heat but to ensure heating I used plastic cardboard blocking off about 1/4-1/2 of the radiator, resetting the error code periodically until spring came to replace the t-stat, including housing. The mounting ears on the new housing required longer bolts. No explanation was given about replacing the housing. The error code is about the t-stat running cooler (opening sooner or stuck slightly open) as the ecm detects operating temps not occurring fast enough, taking longer than programmed expectations. I think this is part of emissions controls; getting up to operating temps sooner allows transitioning from rich (polluting) to lean fuel mixtures while waiting for the O2 sensor to heat up to switch from open to closed loop mode of emissions control.

P0128 appears to be a faulty t-stat in most models when mistakenly replacing the coolant sensor didn't correct the problem.

I'm not entirely familiar with can covers leaking oil into plug cavities and presume it's due to worn seals between cam cover and flats on the cylinder heads for each spark plug boss.
Just for the record. I didnt install the present plugs. A " dealer "
did about 50K ago.
I am aware of what the P0128 code indicates.
Thanks
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Old 06-22-2021, 12:46 PM   #4
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2002 L-Series 3.0L Sedan
2003 L-Series 3.0L Wagon
Default Re: Thermostat and more

I must admit that I struggled with the thermostat housing extension tube more than i think I should have.
Struggled to get it off, struggled to put it back on.
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Old 07-04-2021, 03:54 PM   #5
lrbraner
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Default Re: Thermostat and more

Finally completed project.
New thermostat and housing
New cam cover gaskets
New OEM spark plugs
New upper radiator hose
I found a hose to replace the one from the intake to the canister,
mine was split.
Cleaned and painted some of the parts.
Sandblaster came in handy.
Engine doesnt look to bad for 201K
Attached Images
File Type: jpg 02 Engine.jpg (138.3 KB, 10 views)
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Old 07-14-2021, 03:09 PM   #6
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2002 L-Series 2.2L Sedan
Default Re: Thermostat and more

Wow, your engine bay looks clean! Also good job.
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Old 07-14-2021, 08:53 PM   #7
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Default Re: Thermostat and more

Thank you
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