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Dec 30th, 2023
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 Re: 1999 Tahoe z71 with no Guts
[Re: Karl Dietz]
#9301582
09/10/13 01:29 AM
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Joined: Feb 2013
Posts: 141
jmj201
Outdoorsman
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Outdoorsman
Joined: Feb 2013
Posts: 141 |
The 5.3 is a strong engine. I had a 99 Silverado with the 5.3 and it pulled my boat great. I got an honest 15mpg towing a 19' boat with a 200. I think the 5.3 came with 305 horsepower, while the 97-99 5.7s had 285 horsepower.
Maybe you are having transmission problems? Your Tahoe should pull just fine.
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Re: 1999 Tahoe z71 with no Guts
[Re: Karl Dietz]
#9301916
09/10/13 03:17 AM
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Joined: Feb 2003
Posts: 55,364
SkeeterRonnie
Super Freak
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Super Freak
Joined: Feb 2003
Posts: 55,364 |
Fuel filter or cat converter restriction
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Re: 1999 Tahoe z71 with no Guts
[Re: grout-scout]
#9302700
09/10/13 02:58 PM
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Joined: Jan 2005
Posts: 7,490
redchevy
TFF Celebrity
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TFF Celebrity
Joined: Jan 2005
Posts: 7,490 |
My 1/2 ton 5.3 out pulled my 3/4 5.7 everyday of the week. And got 6 mpg better while doing it. I gotta disagree with that. I have a 2011 5.3 and for towing preferred my 350. Sure the 5.3 make more hp and torque, but it makes it at 5500+ and 4500+ RPM. My 350 didn't make near as much Hp and was closer on torque, but it made max hp at 4000 rpm and max torque at 2400 rpm, right where the rpm's fell pulling in 3rd gear. I will not tow a 4000 rpm... therefore all the power it makes at 5500 and 4500 rpm is pretty useless.
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Re: 1999 Tahoe z71 with no Guts
[Re: Karl Dietz]
#9302955
09/10/13 04:40 PM
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Joined: Feb 2003
Posts: 55,364
SkeeterRonnie
Super Freak
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Super Freak
Joined: Feb 2003
Posts: 55,364 |
I agree with redchevy. I had a 5.7L Yukon, and 5.3L Yukon.. The 5.3L ran as good as it could, but to me "felt" like a dog. It would barely break the tires loose on a hard acceleration.. the 5.7L "felt" like a hoss and would burn the tires off if desired. The gearing was the same on both.
So now I drive a 7.3L Ford Diesel with 500hp and 650lb ft of torque. I love it.
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Re: 1999 Tahoe z71 with no Guts
[Re: Karl Dietz]
#9304248
09/11/13 12:15 AM
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Joined: May 2013
Posts: 445
MarcM64
Angler
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Angler
Joined: May 2013
Posts: 445 |
Another thing I thought about.... I have my own shop. I have seen countless older cars and trucks that come in with no CEL that has a problem. A lot of folks will simply pull the bulb out to just sell the vehicle! I would still check for codes or at least have someone (that you trust) to look at the data on the pcm!
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Re: 1999 Tahoe z71 with no Guts
[Re: MarcM64]
#9304427
09/11/13 01:15 AM
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Joined: Jul 2013
Posts: 965
Karl Dietz
OP
Pro Angler
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OP
Pro Angler
Joined: Jul 2013
Posts: 965 |
Installed the Superchips tune this afternoon and used their default settings for the "Towing" option tune. It also let me correct for the larger size tires.
I'm very impressed with the difference! With the trailer, I could definitely accelerate to highway speeds quicker and it would hold speed much longer on hills before downshifting. In between it runs extremely smooth. It will be interesting to see what happens to the fuel economy on my next trip to the lake this weekend!
The only negative is that I'm supposed to start using 91 octane. Worth it to me to see the motor not having to work so hard!
Much Much Better!
Karl Dietz
2015 BassCat Cougar/250 Mercury ProXS
2 HB Helix 12's
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Re: 1999 Tahoe z71 with no Guts
[Re: Karl Dietz]
#9304570
09/11/13 02:01 AM
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Joined: Jun 2006
Posts: 9,805
Yellowcat
TFF Celebrity
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TFF Celebrity
Joined: Jun 2006
Posts: 9,805 |
Installed the Superchips tune this afternoon and used their default settings for the "Towing" option tune. It also let me correct for the larger size tires.
I'm very impressed with the difference! With the trailer, I could definitely accelerate to highway speeds quicker and it would hold speed much longer on hills before downshifting. In between it runs extremely smooth. It will be interesting to see what happens to the fuel economy on my next trip to the lake this weekend!
The only negative is that I'm supposed to start using 91 octane. Worth it to me to see the motor not having to work so hard!
Much Much Better! Make $$$$ sure if it says run 91 octane you do! In the shop i work in we recently replaced all 8 pistons in a 5.3, 4 of which were broke. The truck had a tuner on it, i cant say they didnt run 91 octane but im pretty sure they didnt. Before i started at this shop they replaced a piston in another 5.3 that the piston crown was melted all the way down to the first compression ring. And it was confirmed that this engine was not run on 91 octane.
Justin 63lb, 2 58lb, several 40's, 38lb, and several 20lb yellas. 
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Re: 1999 Tahoe z71 with no Guts
[Re: Yellowcat]
#9304594
09/11/13 02:09 AM
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Joined: Jul 2013
Posts: 965
Karl Dietz
OP
Pro Angler
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OP
Pro Angler
Joined: Jul 2013
Posts: 965 |
Thanks for the heads up!....Will do!!
Karl Dietz
2015 BassCat Cougar/250 Mercury ProXS
2 HB Helix 12's
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Re: 1999 Tahoe z71 with no Guts
[Re: redchevy]
#9304620
09/11/13 02:15 AM
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Joined: Dec 2008
Posts: 16,194
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,194 |
My 1/2 ton 5.3 out pulled my 3/4 5.7 everyday of the week. And got 6 mpg better while doing it. I gotta disagree with that. I have a 2011 5.3 and for towing preferred my 350. Sure the 5.3 make more hp and torque, but it makes it at 5500+ and 4500+ RPM. My 350 didn't make near as much Hp and was closer on torque, but it made max hp at 4000 rpm and max torque at 2400 rpm, right where the rpm's fell pulling in 3rd gear. I will not tow a 4000 rpm... therefore all the power it makes at 5500 and 4500 rpm is pretty useless. You can disagree all you want, I'm the one that owned them. Was the 5.7 a dud? Maybe. Was the 5.3 one of those special ones made that I rarely get? Maybe. Good luck with the chip, but I'm not sure you'll get better mileage and you didn't know the true mileage anyways since the tires weren't accounted for before the chip. Keep us informed though, I've never read about the gasoline chips.
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Re: 1999 Tahoe z71 with no Guts
[Re: grout-scout]
#9304680
09/11/13 02:36 AM
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Joined: Jul 2013
Posts: 965
Karl Dietz
OP
Pro Angler
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OP
Pro Angler
Joined: Jul 2013
Posts: 965 |
Actually I did alter the mileage distance by 3.7% to account for the larger tires when I figured the mpg.
I've only owned this car for three weeks so I haven't run many tanks thru it to see a true average.
Karl Dietz
2015 BassCat Cougar/250 Mercury ProXS
2 HB Helix 12's
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Re: 1999 Tahoe z71 with no Guts
[Re: Karl Dietz]
#9304815
09/11/13 03:23 AM
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Joined: Dec 2008
Posts: 16,194
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,194 |
Good deal. Most people just look at the odo, do the gallons and don't take the time to really calc it out like you were doing.
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Re: 1999 Tahoe z71 with no Guts
[Re: Karl Dietz]
#9304817
09/11/13 03:24 AM
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Joined: Feb 2013
Posts: 141
jmj201
Outdoorsman
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Outdoorsman
Joined: Feb 2013
Posts: 141 |
I am shocked that a tuner fixed your issue.
Mine is bone stock and tows great.
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Re: 1999 Tahoe z71 with no Guts
[Re: jmj201]
#9305095
09/11/13 11:24 AM
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Joined: Jul 2013
Posts: 965
Karl Dietz
OP
Pro Angler
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OP
Pro Angler
Joined: Jul 2013
Posts: 965 |
I was surprised too! I think the oversize tires were the real issue because everything checks out mechanically.
The tuner was cheaper than replacing the almost new tires. I think changing the shift points made the biggest improvement and it must have advanced timing a little because of the requirement to start using 91 octane?
I'll get some miles on it and report back.
Karl Dietz
2015 BassCat Cougar/250 Mercury ProXS
2 HB Helix 12's
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Re: 1999 Tahoe z71 with no Guts
[Re: grout-scout]
#9305433
09/11/13 02:09 PM
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Joined: Jan 2005
Posts: 7,490
redchevy
TFF Celebrity
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TFF Celebrity
Joined: Jan 2005
Posts: 7,490 |
My 1/2 ton 5.3 out pulled my 3/4 5.7 everyday of the week. And got 6 mpg better while doing it. I gotta disagree with that. I have a 2011 5.3 and for towing preferred my 350. Sure the 5.3 make more hp and torque, but it makes it at 5500+ and 4500+ RPM. My 350 didn't make near as much Hp and was closer on torque, but it made max hp at 4000 rpm and max torque at 2400 rpm, right where the rpm's fell pulling in 3rd gear. I will not tow a 4000 rpm... therefore all the power it makes at 5500 and 4500 rpm is pretty useless. You can disagree all you want, I'm the one that owned them. Was the 5.7 a dud? Maybe. Was the 5.3 one of those special ones made that I rarely get? Maybe. Good luck with the chip, but I'm not sure you'll get better mileage and you didn't know the true mileage anyways since the tires weren't accounted for before the chip. Keep us informed though, I've never read about the gasoline chips. You really ought to replace that cup of piss in your cheerios with milk 
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Re: 1999 Tahoe z71 with no Guts
[Re: redchevy]
#9306008
09/11/13 05:23 PM
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Joined: Dec 2008
Posts: 16,194
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,194 |
My 1/2 ton 5.3 out pulled my 3/4 5.7 everyday of the week. And got 6 mpg better while doing it. I gotta disagree with that. I have a 2011 5.3 and for towing preferred my 350. Sure the 5.3 make more hp and torque, but it makes it at 5500+ and 4500+ RPM. My 350 didn't make near as much Hp and was closer on torque, but it made max hp at 4000 rpm and max torque at 2400 rpm, right where the rpm's fell pulling in 3rd gear. I will not tow a 4000 rpm... therefore all the power it makes at 5500 and 4500 rpm is pretty useless. You can disagree all you want, I'm the one that owned them. Was the 5.7 a dud? Maybe. Was the 5.3 one of those special ones made that I rarely get? Maybe. Good luck with the chip, but I'm not sure you'll get better mileage and you didn't know the true mileage anyways since the tires weren't accounted for before the chip. Keep us informed though, I've never read about the gasoline chips. You really ought to replace that cup of piss in your cheerios with milk Oh sorry, I guess I failed to see since you owned my 2 trucks that you were qualified to disagree with me. By the way, I don't eat Cheerios and I don't drink piss so you can keep both.
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