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12-18-2008, 10:22 AM
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#1 |
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People know me
Join Date: Jun 2007
Location: Hermiston, oregon
Posts: 840
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5.3 Idle problems
Just recently since it has gotten cold outside 20 degrees and below, our tahoe has been having some problems. I went to start it the other day and it fired up and died immediatley, I fired it up again and the same thing, I can get it started and give it gas and it will run, After about a minute it will idle on its own, But its up and down in rpms.
It has 83k on it and is the new body style, yesterday I changed out what appeared to be oem plugs, wires, fuel filter, and air filter, Cleaned the map sensor, and throttle body. Right after all this started I figured it was water in the fuel so i dumped a bottle of prestone water remover in a 1/4 tank of gas and some injector cleaner as well. I fired it up this morning when i got home and it fired right up and stayed running went right up to 1500rpm then down to a slightly rough 1000rpm then back to 1500 for about 5 seconds then back and forth. Where should i go from here? No check engine light is on
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1972 k/5 blazer CST 4X4 Crate 350, th350/205, dana44with trac-loc/14 bolt with detroit locker, 4 wheel discs 4.56s, 8" suspension lift using 73-87springs, 1" zerorate custom front crossmember, HAD CV drivelines and driveshaft e-brake, full cage, PRP seats, Full autometer gauges, 38x14.5x16 Toyo M/Ts, 16x10 Polished aluminum rockcrusher wheels 1967 longbox 4x4, Strong 400/400/208, 44/12bolt 4.10s, 6" lift, 35" Toyo M/Ts on corvette rally wheels |
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12-18-2008, 11:00 PM
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#2 |
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Registered User
Join Date: Apr 2001
Location: Arizona
Posts: 147
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Re: 5.3 Idle problems
What year is it?
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1969 Blazer: 350/350, 4X4, HEI, Edlebrock carb/intake, dual flowmasters, np205, 3:07's and the rest is mostly stock. The front end disc swap is finally complete  2002 Z71 Tahoe. CAI, Flowmaster 40, Silverstars in high, low and fogs and a bunch of mods (upgrades) inside and out. |
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12-18-2008, 11:12 PM
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#3 |
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People know me
Join Date: Jun 2007
Location: Hermiston, oregon
Posts: 840
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Re: 5.3 Idle problems
2000 new body style, I cleaned the IAC and so far so good.
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1972 k/5 blazer CST 4X4 Crate 350, th350/205, dana44with trac-loc/14 bolt with detroit locker, 4 wheel discs 4.56s, 8" suspension lift using 73-87springs, 1" zerorate custom front crossmember, HAD CV drivelines and driveshaft e-brake, full cage, PRP seats, Full autometer gauges, 38x14.5x16 Toyo M/Ts, 16x10 Polished aluminum rockcrusher wheels 1967 longbox 4x4, Strong 400/400/208, 44/12bolt 4.10s, 6" lift, 35" Toyo M/Ts on corvette rally wheels |
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12-18-2008, 11:36 PM
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#4 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,217
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Re: 5.3 Idle problems
Vacuum leak of the intake gasket
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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12-19-2008, 12:11 AM
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#5 |
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Registered User
Join Date: Apr 2001
Location: Arizona
Posts: 147
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Re: 5.3 Idle problems
Yup, wan't sure of the year, but that is where I would have sent you looking for a place to start.
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1969 Blazer: 350/350, 4X4, HEI, Edlebrock carb/intake, dual flowmasters, np205, 3:07's and the rest is mostly stock. The front end disc swap is finally complete 2002 Z71 Tahoe. CAI, Flowmaster 40, Silverstars in high, low and fogs and a bunch of mods (upgrades) inside and out. |
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