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2003 Deville (base)
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19 Posts
Discussion Starter #1
Just finished doing the plenum gasket repair to fix the P0171 and P0174. It went pretty smooth and car is running as it used to. Less than 100 miles after I finished that I threw the P0174 code and that one doesn't look like fun. I cleared all the codes and monitored them until the P0174 was gone from history. Could this have shown up as some kind of fluke from when I fixed the plenum? It hasn't come back for a couple hundred miles.
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
Recheck all of the intake ducting connections, resonator connection, and vacuum/PCV lines.

Did you use a torque wrench to bolt on the intake manifold?
 

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2003 Deville (base)
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19 Posts
Discussion Starter #3
Thanks for the reply. No, I did not use a torque wrench. Like others who have posted about this my intake manifold bolts were loose when i took them off, so I pretty much tightened them by hand and then a little turn using a ratchet.

I guess I need to go back and check those? Or, wait and see if it throws the code again? I don't have a torque wrench, but can get one if needed.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,479 Posts
The proper torque on your intake manifold bolts is 89 lb/in. About 7.5 lb/ft. Not much - don't crack a bolt boss.
 

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2003 Deville (base)
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19 Posts
Discussion Starter #6
Just realized I messed up my original question with a wrong code. should have read as below, with the P0741. I would like to think torqueing the intake manifold would help, but I've got a feeling it isn't.

Just finished doing the plenum gasket repair to fix the P0171 and P0174. It went pretty smooth and car is running as it used to. Less than 100 miles after I finished that I threw the P0741 code and that one doesn't look like fun. I cleared all the codes and monitored them until the P0174 was gone from history. Could this have shown up as some kind of fluke from when I fixed the plenum? It hasn't come back for a couple hundred miles.
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
Totally unrelated. That code means there're internal deal leaks in the converter clutch and/or the transmission, keeping the converter from locking.

You can drive it indefinitely with this issue, the only symptoms will be slightly higher RPMs and a couple less MPGs at highway speeds. However, if you have to pass inspection, it's an automatic fail.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,479 Posts
Normally (as "normal" as anything can get in these cars) a P 0741 without P 1860 says that the TCC converter fluid seals and or transmission input shaft bearing sleeve are wearing to the point that TCC engagement fluid doesn't quite do the trick any more - sometimes. It will become more frequent as time/miles pass, and that's an engine drop/transmission/torque converter removal - repair process.

In company with P 1860 - or P 1860 alone - says that the TCC fluid control solenoid has packed it in. Depending on shop and skill level it's either a transmission removal job OR 8 hours of microsurgery, working through a 1" space formed by opening the transmission side cover - after removing nearly everything from the driver's side of the engine compartment.
 

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2003 Deville (base)
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19 Posts
Discussion Starter #9
OK, thanks for the input. I inherited this DeVille from my dad four years ago and it seems something goes wrong with it every few months.

The AC mode door actuator, (Fixed by info from this site)
The oil pressure sensor, (Fixed by info from this site)
The oil filter adaptor, (Fixed by info from this site, dealer said it was my main seal)
The plenum gasket, (Fixed by info from this site)
The water pump tension pulley, (currently being fixed by info from this site)
The side view mirror going dark, (trip to junk yard $125)
The air bag light intermittently coming on and off, (Fixed by info from this site)
and now the P0741 issue. , (NOT going to be fixed by info from this site) I'll just keep clearing it and save the money. I live in Texas, but not in an area that checks for emissions;


I have a '98 F150 (275k miles) and a 2001 F250 V10 (230k miles) and they rarely have issues. Last GM vehicle I had was an '88 Beretta and it was also nothing but problems.

I do enjoy working on my own vehicles, but also live on a farm and have other things I need to be doing.

I also appreciate all the help I get on this forum. thanks
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,479 Posts
I have owned five F-150s, from the 302 automatic to the I-6 5-speed and the 4.6 auto 4X4. Every one of them has been dead-nuts reliable to over 150,000. My current 2004 4.6 auto 4X4 is more comfortable (and of course, has better road visibility) than the STS. It has become our vehicle of choice for long road trips.
 
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