2000 Year, Chevrolet, C3500 4L80E Transmission?

[Big Bubba]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

Yeap, my engine seems to be running Great!!!. I have did a complete lower intake manifold gasket change due to water mixing with my oil and it was not running good at all when I went to move it to perform the lower intake manifold gasket change and it did throw a CEL code P0102, map sensor circuit low. But I am guessing becuase I had so much moisture in my oil that it was choking out the motor and throwing the code on me. Yeap, my truck stalled onme three times just moving it off my grass inmy yard into my driveway in front of the garage but after the intake install she is running great now. I also replaced the spark plugs, distributor cap and rotor. All in all I am very happy with the running condition of my truck except for the transmission acting up after driving it a while. For the TPS I wish I new of a better way to test it becuase I don't have a scanner that does live scans.

 

[RogersJetboat454]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

Yeap, my engine seems to be running Great!!!. I have did a complete lower intake manifold gasket change due to water mixing with my oil and it was not running good at all when I went to move it to perform the lower intake manifold gasket change and it did throw a CEL code P0102, map sensor circuit low. But I am guessing becuase I had so much moisture in my oil that it was choking out the motor and throwing the code on me. Yeap, my truck stalled onme three times just moving it off my grass inmy yard into my driveway in front of the garage but after the intake install she is running great now. I also replaced the spark plugs, distributor cap and rotor. All in all I am very happy with the running condition of my truck except for the transmission acting up after driving it a while. For the TPS I wish I new of a better way to test it becuase I don't have a scanner that does live scans.

Remind me on Monday (send a PM). I will pull up the wiring schematic at work to see what color wires do what, on what should be 3 wires to the TPS. If you back-probe both the sensor output and ground with a multi-meter (red lead on output, black lead on ground), you can watch the voltage sweep.
This is at your own risk though!!! If you tap into V-ref, and short it to ground, there is the slight potential that you could "brick" the PCM (in other words, make it into an expensive paperweight).

 

[Big Bubba]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

RogerJetBoat454,
Yeap, I definitely would not want to do that. That would be my luck to fry the PCM out and have to purchase a new one. One more question for you. Are the Throttle Position Sensors commonly go bad on a GM car or truck or are they pretty reliable and not prone to being faulty?

 

[RogersJetboat454]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

RogerJetBoat454,
Yeap, I definitely would not want to do that. That would be my luck to fry the PCM out and have to purchase a new one. One more question for you. Are the Throttle Position Sensors commonly go bad on a GM car or truck or are they pretty reliable and not prone to being faulty?

If we were talking about an old school GM, yes, I have seen my fair share of TPS's give up the ghost, particularly the ones inside the old CCC carburetors used during the 80's. In your case, you would have a newer style sensor which is pretty reliable.

I assume this is a gas engine we are talking about. There were 3 engine options for your truck. 2/ 5.7L's and the 454. If this is a gas engine, the TPS for all of the above flavors are wired the same, and you can test them with a volt meter using the following method;

-Get your self some small paper clips, and straiten the ends out.
-With the key off, back probe the dark blue and black wires going to the TPS (do not disconnect the plug). You do this by CAREFULLY sliding the tip of the paper clip between each wire, and its respective silicone insulator that surrounds it in the connector for the TPS. What your trying to accomplish is getting the paper clip to make electrical contact with the terminals inside the connector going to the TPS.
-Try to be sure that the paper clips aren't touching each other at any point when you are doing this.
-Place the red lead of your volt meter on the paper clip back-probing the dark blue wire.
-Place the black lead of your volt meter on the paper clip that's back-probing the black wire.
-Turn the ignition switch on, but don't start the engine.
-Turn your volt meter on, and observe the voltage with the throttle closed. The voltage should be around .5 volts. If you are not seeing voltage, or the volt meter is "hunting" around (not displaying a steady voltage), CAREFULLY move the paper clips around a bit to see if you can get a better connection, being mindful to keep them from touching each other.
-Now grab the throttle body linkage, and slowly open the throttle while watching the voltage on your volt meter. The voltage should slowly climb without dropping, or spiking. If it drops out, or spikes than you may have an internal issue with the sensor.
-Once you open the throttle all the way to WOT, you should see at least 4.5 volts on your voltmeter if not more (up wards of 5 volts).

I'll say it again... You do this at your own risk. Stuff can be done while you're doing this that may cost you money. If you are at all wary about this, don't do it. I personally don't like disturbing wires when I don't have to, and prefer to use a scan tool that supports a live data stream if I can. But it works fine if you're in a pinch without access to a scan tool.

 

[Big Bubba]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

RogerJetboat454,
We'll the second transmission guy called me back this afternoon and gave me a good price on repairing the valve body on my transmission. He said that the AFL(Actuator Feed Limit) valve was the cause of my problem. He said that he would ream out the bore in the valve body for the AFL valve. He said he would install a upgraded version of the valve, replace some seals/o-rings, a few solenoids that could cause this, some springs etc and this includes the synthetic transmission fluid, filter, and gasket. He said he is very sure the valve body is the cause and the AFL valve upgrade will fix the issues. I also think he said he was replacing, if I remember correctly, some accumulator springs as well. I would say the price but not sure if I am allowed to or not on this forum. I do know it will not be over $500.00 for this repair to be done on the valve body. He also said that he would go through that valve body thoroughly and clean it out after reaming out the bore for the AFL valve. I just got to take what this guy says is true becuase I have nobody else to turn to now except for myself so I will go with what he says and get this done and hope this fixes my issue for good. I will post my findings or how it is working after the repair is done which I will not be able to afford until mid February 2013. Thoughts......

 

[RogersJetboat454]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

RogerJetboat454,
We'll the second transmission guy called me back this afternoon and gave me a good price on repairing the valve body on my transmission. He said that the AFL(Actuator Feed Limit) valve was the cause of my problem. He said that he would ream out the bore in the valve body for the AFL valve. He said he would install a upgraded version of the valve, replace some seals/o-rings, a few solenoids that could cause this, some springs etc and this includes the synthetic transmission fluid, filter, and gasket. He said he is very sure the valve body is the cause and the AFL valve upgrade will fix the issues. I also think he said he was replacing, if I remember correctly, some accumulator springs as well. I would say the price but not sure if I am allowed to or not on this forum. I do know it will not be over $500.00 for this repair to be done on the valve body. He also said that he would go through that valve body thoroughly and clean it out after reaming out the bore for the AFL valve. I just got to take what this guy says is true becuase I have nobody else to turn to now except for myself so I will go with what he says and get this done and hope this fixes my issue for good. I will post my findings or how it is working after the repair is done which I will not be able to afford until mid February 2013. Thoughts......

You can post any price you want...
Sounds good though. Good luck!

 

[HopinImFloatin]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

sounds like the second trans guy is on track, valve body wear is a common problem and will cause p1870 slip code.. But before you go ahead with any repairs, SMELL the fluid. If it smells burnt at all, there is internal clutch damage(due to slipping- hence the p1870 slip code) and the trans should be dissassembled and inspected. Sounds like your trans guy is alert enough to know this though. Otherwise...carry on

 

[Big Bubba]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

Yeap, that was one of the things he did was look at the fluid on the transmission dip stick and said it was a little dark but nothing major in his opinion. Yeap, he looked my transmission over pretty good using a hand held infrared gun to check the transmission temp then he pluuged up his high tech scanner under the drivers side dash and said that there was no codes and it also said the trans temp to be 140 degrees. I really liked this guy and he seemed like he definitely knew what he was talking about. He also took my truck on a test drive and did some test and did the brake test to make sure the torque convertor unlocked when the brake applied, which it did, and the torque convertor set when we came up to speed and I asked him while we were driving did he think I need a rebuild and he said definitely not this transmission feels to good for a complete rebuild and he said my problem is the worn AFL valve in the valve body causing my issues. He said he will ream that out and do updates and make sure it is right before he installs the valve body back in the truck. So I am done troubleshooting trying to figure it out and go ahead and get this work done mid February 2013. I have a gut feeling I will be very happy with the repair and driving my truck home from the guys shop after this repair has been completed. I will post the final results in this post.

 

[Big Bubba]

Re: 2000 Year, Chevrolet, C3500 4L80E Transmission?

//////UPDATE//////
I have decided that I am going to purchase a brand new 4L80E valve body kit from Ebay and do this job myself and save some money. This is the Ebay item I am purchasing once I recieve my state tax money in the bank. http://www.ebay.com/itm/4L80E-VALVE...Parts_Accessories&hash=item3a70078bcc&vxp=mtr. Not a bad price for this brand spranking new 4L80E valve body kit. What do you think. Is this going to be a hard job for me to tackle myself. I am pretty good turning a wrench. All I am worried about is the 8 check balls that sit above the seperator plate between the transmission case and valve body. My plans with the 8 check balls is to use Wal-Mart brand, Equate 100% pure petroleum jelly vaseline to glue the check balls to the bottom of the transmission and vaseline the accumulator springy thing to the bottom of the transmission case as well. If I can keep the check balls up in the transmission case and that accumulator springy thing while installing the valve body then I will be good to go. I really think my valve body is worn, the bores that is for the actuator feed limit valve and the TCC Isolator valve bore as well and maybe some other valves as well that are worn or sticking inside the valve body causing my fourth gear or overdrive loss after the tranny is warmed up and driving it a while. Will see how it goes. It could go good or bad but hope it goes good with the valve body replacement. I will keep you posted on how it finally turns out. Thank you and any suggestions would be appreciated if you have any.