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Thread: 07 Silverado 5.3L feels sluggish
08-24-2010, 01:02 PM #1
07 Silverado 5.3L feels sluggish
My 07 Silverado NBS performance feels like it has gotten sluggish lately. 5.3L all stock except for K&N filter and slightly larger tires. I've put roughly 85k miles on it. Engine fans (electric type) seem to run alot if temp is mid 90's or higher. Any thoughts or suggestions?
08-24-2010, 01:11 PM #2
Last edited by 99'HEARTBEAT; 08-24-2010 at 03:17 PM.
5.3 l 3.73 l G80
BLACK BEAR CUSTOM TUNE
SNUGTOP l COLORMATCH l KATZKIN
08-24-2010, 01:16 PM #3
The electric fans turn on when the a/c is turned on, so if its in the mid 90's I assume you have the a/c on?? Also what '99Heartbeat ask about tire size and sluggishness.
08-24-2010, 01:36 PM #4
Sluggish more so off the line, especially when it's hot. I'm not interested in racing, but it used to have better pep. 3.42 gears with 285-60 on stock 18 wheels.
08-24-2010, 03:08 PM #5
Its normal for an engine to get sluggish when it gets hot, heat is the enemy, the more heat you can extract from the engine bay the better you truck will run. Also when you are running the ac not only does the compressor put extra load on the engine the electric fans are also putting an extra load on the alternator which also puts more load on the motor.1999 Silverado Regular Cab Short Box
Black on Black, Line-X sprayed in bed liner
5.3 with K&N CAI, Texas Speed 220/220 cam with 112 deg LSA
Texas Speed computer Tune
American Racing Headers with Cats
4.11 gears front and back, with Eaton rear posi
Flowmaster 40series true duals
16X8 American Racing Nitros with 305/70/16 Goodyear MTR's
285's in the pic
If it ain't broke...........Give me a minute!
Im not completely useless, I can be used as a bad example...
08-24-2010, 03:14 PM #6
OK, you have factory 3.42 gears. The stock tires were most likely 265/70-17's. The 285's tires are taller and so the truck acts like it has 3.23 gears. Also did you reprogram the trucks ecm for the taller tires?
08-26-2010, 10:16 PM #7
The stock tires were actually 265/65-18 (Z71 wheels). Therefore, my stock tires were actually a bit taller than my 285. I have not reprogrammed. Could catalytic converter(s) be bad?
08-27-2010, 12:43 AM #8
Clean your MAF.Black Bear Performance- Custom Tuning Solutions
Authorized EFILive and MAGNACHARGER seller
08-28-2010, 07:54 AM #9
08-28-2010, 10:27 AM #10
You can get a can of CRC MAF Sensor cleaner at autozone, it's about $7. Also get a can of CRC Throttle Body & Air Intake cleaner as well. Your throttle body could have some major build up of carbon since you have already put 85k miles on an '07. I recently cleaned the throttle body and MAF sensor and my truck runs 100% better and I only have 80,6XX on my '03.2003 Silverado 2500HD 6.0L Vortec V8
2" Body Lift
3" Suspension Lift
Skyjacker Hydro 7000 Shocks
Skyjacker Steering Stabilizer
35" Tires with 20" American Racing Rims
Velocity Cold Air Intake
Billet Throttle Body Spacer
BBK Performance Headers
MBRP Cat-Back Exhaust System
DiabloSport Predator- Soon to be tuned by Diablew
"Soon to be leveling-kit"
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