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TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old 08-03-2002, 01:26 PM   #1
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how to know when throttle pos. sensor is bad...

how do you know when your throttle position sensor is bad on a tbi? i think mine may be bad, thats what everyone says it may be... thanx
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formerly L03...
(new gm crate 5.7l police interceptor)
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iroc hood
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Old 08-03-2002, 03:37 PM   #2
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The TPS tells the computer where the gas petal is so it can give the right amount of fuel. Does your car cut out? WHen you change the position of the pedal does it come back? From what I have heard it works by a voltage. Not sure how to check it, or how much it puts out.
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1988 Firebird, 305, 5-speed, TBI, 16" Formula rims, Ravin Muffler, Hooker Super Comps and Y pipe, removed cat and A.I.R. pump, Did a slight mod to the air cleaner, I cut off about 4".


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Old 08-03-2002, 03:37 PM   #3
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someone please help me out..
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89 RS T-tops White w/ black heritage stripes /black headlight pockets and open bowtie grill w/out foglights.
formerly L03...
(new gm crate 5.7l police interceptor)
700r4 trans.
polished rs/z28 15' wheels
iroc hood
RACECAR spelled backwards is RACECAR
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Old 08-03-2002, 03:43 PM   #4
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At a pedal position does your car cut out? Any? The TPS car develope dead spots. Or it will not start at all. Even at start up if it doesn't unless you give it a little gas, that could also be the TPS.
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1988 Firebird, 305, 5-speed, TBI, 16" Formula rims, Ravin Muffler, Hooker Super Comps and Y pipe, removed cat and A.I.R. pump, Did a slight mod to the air cleaner, I cut off about 4".


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Old 08-04-2002, 09:59 AM   #5
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Dead Spots

You will also get dead spots in your acceleration....
You push your foot on the pedal, and partway down you may experience your engine cutting out, or huge hesistation at some point. Not very much fun.
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Old 08-04-2002, 05:36 PM   #6
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Send a message via AIM to InTeRcEpToR5.7l
EXACTLY!
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89 RS T-tops White w/ black heritage stripes /black headlight pockets and open bowtie grill w/out foglights.
formerly L03...
(new gm crate 5.7l police interceptor)
700r4 trans.
polished rs/z28 15' wheels
iroc hood
RACECAR spelled backwards is RACECAR
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Old 08-04-2002, 11:33 PM   #7
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Also, the car will "surge" when it's sitting at idle like at a light. It's not very fun to have the brake lightly pressed and have the car lunge forward almost rear ending the person in front of you.
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Old 08-06-2002, 10:19 AM   #8
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seriosly i know what you mean, well mine idles too low too and dies sometimes, its been noooo fun to drive so i havent moved it in liek a week....just cuz im poor and cant aford my tps yet...
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89 RS T-tops White w/ black heritage stripes /black headlight pockets and open bowtie grill w/out foglights.
formerly L03...
(new gm crate 5.7l police interceptor)
700r4 trans.
polished rs/z28 15' wheels
iroc hood
RACECAR spelled backwards is RACECAR
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Old 08-07-2002, 07:29 PM   #9
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it sences the throttle angle by voltage hence throttle position sensor.(tps) u can check the voltage by probing the conector and using a volt meter.I dont remeber correct voltage of the top of my head , is it .45 someone will know im to lazy to go look.make sure the voltage changes acording to the trottle angle of the trottle blade.
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Old 08-09-2002, 09:55 AM   #10
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To test put volt meter probes into connecton on tps. In the closed position you should see .56 volts +/- .07 volts. In the wide open throttle position you should see a reading above 4 volts. In between should be smooth rise to 4 volts with no dead spots. Do the test with the ignition on but the engine off. Hope this helps.
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Old 08-11-2002, 01:03 AM   #11
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My 91 RS Kept giving me a 22 trouble code, and when the Service engine soon light would come on, it would try to take off (usually through a red light!) the TPS Fixed the problem
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Old 08-11-2002, 08:30 AM   #12
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SES alway comming on and car runs realy rough. TPS solved all of that. Now I'm saving more gas....
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305 TBI
LO3
Modification:
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MSD 6a
MSD Ignition Blaster
MSD Distributor Cap
MSD Rotor
MSD Spark Plug Wires
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TES Edelbrock
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Old 08-11-2002, 09:52 PM   #13
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Whoa! check it out! Two guys with Taz as their avatar that both replaced their TPS and it fixed both their problems! CRAZY! Maybe it's a sign.......
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Ported TBI, 55pph injectors, Edelbrock Intake, LT1 Cam, SLP Headers with elec. cutout and Hooker Catback, Full MSD Ignition, Nitto Drag Radials, LS1 D/S, 3.42 posi disc rear, Spohn LCA's and relocators, WBO2 & Prominator, 36/24 mm sway bars, 4" Cowl, Nitrous, 17x9.5/11" Gunmetal ZR1 wheels, Koni Yellows, C6 brakes, J&M Camber/Caster plates, WS6 springs. Up next: PHR, Roll bar, GC Weight jackers

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Old 08-11-2002, 10:59 PM   #14
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TPS issues

I had BOOKOO problems with my TPS on my NEW Holley. I kept fiddling and fiddling with it, nothing worked right. I had to replace it and everything worked right.
Just letting you guys know even if a TPS is new, doesn't mean it's not the problem.
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ASCD RamAir Hood / 4-bolt main Recon performance engine 708520 HD (CUSTOM 350 CI) / 2.02 Intake 1.60 Exhaust Valves / 10:1 Flat Top Hypereutectic Pistons / Moly Rings / Crane Double Roller Timing Chain / Cast Iron Crankshaft / Crane 2030 FT cam / 204/214@.050 - 110 SEP - .423/.446 LIFT INT/EXH / Non-drop base open element K&N / Holley 670CFM TBI unit 502-6 / GM#12116257 TPS connector / Custom TBI spacer made by DC Water Jet / Weiand 300-49 intake manifold / GM#1711-3433 EGR Valve / Hiflow CAT / FlowMaster 80 Catback / 180* thermostat / Radiator fan switch / KaleCo Bumper Sticker (THAT gave me 15 HP!)
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Old 08-11-2002, 10:59 PM
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