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Tiny
RICKY LEWIS
  • MEMBER
  • 1999 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 300,000 MILES
After around twenty miles of driving, the truck will go into underwater mode is what I want to call it because it sounds like the exhaust is plugged. I do not have catalytic converters. Also, like T converter may be locking all the way in down shifting? Forget it it downshifts shoots to three grand and creeps to hopefully the speed limit. Replace pump twice. Recently, fuel filter, MAF, MAP, water pump, fuel pressure regulator. Also radiator and thermostat.
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Saturday, June 30th, 2018 AT 2:05 AM

15 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.
Just curious before we get started. Is the check engine light on? Does it seem like a sluggish transmission issue?

Danny-
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Saturday, June 30th, 2018 AT 3:20 AM
Tiny
RICKY LEWIS
  • MEMBER
  • 9 POSTS
Transmission was just built not 10,000 miles ago and yes it is for post catalytic converter o2 sensors, but they are switching on scanner somehow and nothing is plugged it. It just threw a bank 2 sensor 1 yesterday, but problem was there before it threw this for also my spark advance is like 40°.
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Saturday, June 30th, 2018 AT 11:42 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, Danny here.
Can you give me a little more symptom information? You mentioned in your post about the torque converter locking up but usually if the torque converter stays locked up in overdrive when slowing/coming to a stop it has a tendency to stall.
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Saturday, June 30th, 2018 AT 2:39 PM
Tiny
RICKY LEWIS
  • MEMBER
  • 9 POSTS
Do not think it is transmission related. My ECT numbers are way off, but still is my IAT reading is way out of normal. It has new MAF on it fuel TR numbers are off the wall to, 17° spark advance at idle.
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Sunday, July 1st, 2018 AT 1:18 PM
Tiny
RICKY LEWIS
  • MEMBER
  • 9 POSTS
Computer maybe?
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Sunday, July 1st, 2018 AT 5:42 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Do you have access to a scanner/scan tool that can stream live data while driving vehicle when this happens?
Danny-
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Monday, July 2nd, 2018 AT 2:20 AM
Tiny
RICKY LEWIS
  • MEMBER
  • 9 POSTS
Yes, I can access live data. My coolant temperature on scanner says 35° and it is not the sensor, I got a new one and still reads the same my IAT are like 40° and it is a new MAF, and my timing at idle is jumping anywhere from 17° all the way up to 45°. I am so turned around on this one it has got to be the computer from what my brain is telling me, but I do not want to throw parts and it. Also, it was an intermittent problem now I believe it is all the time.
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Monday, July 2nd, 2018 AT 12:02 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Yes, sounds like you might have a PCM glitch. Let me do some more research and get back to you.
Danny-
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Monday, July 2nd, 2018 AT 4:42 PM
Tiny
RICKY LEWIS
  • MEMBER
  • 9 POSTS
Timing is jumping up to 7 degrees with just one 569-579 rpm range also.
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Tuesday, July 3rd, 2018 AT 3:01 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.
Have you tried cleaning the connections at the PCM? I once had a Silverado having wacky electrical problems including no communication with data link/diagnostic port. I disconnected PCM and noticed corrosion on one of the two harness connectors and the PCM's pins as well. After using electrical contact cleaner and a wire brush. It fixed all the electrical craziness and restored all systems. Just a thought.
Danny-
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Wednesday, July 4th, 2018 AT 1:13 AM
Tiny
RICKY LEWIS
  • MEMBER
  • 9 POSTS
I am going to try that. Thank you.
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Wednesday, July 4th, 2018 AT 10:19 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

You are welcome! Have a great 4th and keep me posted!
Thanks again for using 2CarPros. Com. Danny-
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Wednesday, July 4th, 2018 AT 4:25 PM
Tiny
RICKY LEWIS
  • MEMBER
  • 9 POSTS
Thanks man I'm going to grab two upstream o2 sensors today and put in. I think my IAT are way too far off. How can I get them down? They are like 70°c. That is way too high and it is a brand new MAF.
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Thursday, July 5th, 2018 AT 12:49 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Have you swapped the sensors? Notice any change?
Danny-
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-1
Sunday, July 8th, 2018 AT 2:43 PM
Tiny
RICKY LEWIS
  • MEMBER
  • 9 POSTS
I put an o2 sensor in on bank 2 sensor 1 and that seemed to have really helped. However, my ltft is up in the high teens positive like 15 and 16 on both banks. If I turn AC off in truck it drops to like positive 8 and it says fuel system 1 and 2 clsd fault when in closed loop. Has new pump, new pressure regulator, and new fuel filter. Could the injector be sticking open? I ran marvel mystery oil through the gas tank and 44 k from BG through before new pump was installed and maybe a little more than I should have. Not sure. Any ideas?
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Sunday, July 8th, 2018 AT 6:43 PM

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