Who's got a good idea on how to keep a good connection while doing this? I was testing it last night and the reading would hold and then jump around then hold for a bit. The voltage seemed low ( 0.39v to 3.85v at WOT) but it wouldn't stay steady enough for me to be able to adjust it. I hope these low readings are part of my starting problem. Any ideas???

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350 TPI, 700R4(rebuilt), K&N's, MSD 6AL, Headers, Flowmaster, 160* stat, airfoil, MAF screens cut out. 13.88 @ 101.18 mph

 

Well, the range is from initial (Personally, I like .35-.45 max) up to around 4.5-5V@WOT. I have seen as little as 4.3V@WOT. Depending on the car, somewhere around 80% triggers WOT to the computer, I think that is 80% of 5V. The reading shouldnt jump around at all if the throttle isnt moving. I just stick a pin in the wire and hook the other end of my DVM to ground, works fine for me. Been doing that since 1986.

 

Back when my 76 4x4 blazer was injected by a Holley TB system, I had to devise a quick way.

Here's how:
1. I used "Scotch Locks", one per wire

2. A couple of female spade terminals (if your VOM leads wont go into the scoth locks and contact the male terminals)

3. A little wire as required

As much as I hate scotch locks, they worked fine for this. I left them on full time, then I only had to connect the spade terminals and wire when I needed to test.


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KevinP92Z
92 Z28 383 SLP cam,SLP headers,SLP 2ontheLeft,Trick Flow TW heads & pistons,Edelbrock base,Accel SuperRam,52mmTB,Scat Crank & forged ConnRods,MSD 6AL,SLP convertor,Baer 13/12" Track,Moser axles,Hotchkis,Genuine GM 3.42s,SLP HD Torsen,17x9" chrome SS rims
96T/A w/SLP Ram Air,SLP 2ontheLeft, Bilsteins, Baer, Hotchkis, Genuine GM, Torsen
76 4X4 Blazer 400TPI project

 

Take three wires, four inches long each. Remove the insulation from both ends about half an inch. Remove the insulation from the center of each wire, about a quarter of an inch. Take the yellow splices you get with a wire stripper set and remove half of the yellow insulation from the splice. Crimp one end of each wire to the three splices. Puch the splices onto the TPS harness conector and twist the other ends and push them into the TPS switch. Make sure you're getting the proper voltage from the "HOT" wire that supplies power to the TPS and then check your signal wire for the proper return voltage to the ECM. Hope this helps.

 

My tps reads exactly .54 at idle but only gets up to 3.8 at WOT. Should I replace it??

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87 IROC-Z 305 TPI
MSD 6AL & Blaster II Coil, Richmond 3.73, K&N Filters, TPIS Airfoil, TPIS AFPR, Custom Cold Air, KYB Shocks & Struts, Ported Plenum Runners and Manifold, Comp. Eng Subframe Connectors, SLP Headers, Borla 3", Hi-flo cat, TH700-R4 with TCI Pro Super Kit and 2100 rpm stall converter
www.acsu.buffalo.edu/~ermer

***** FOR SALE *****

 

To only add more confusion to the voltage... I've noticed when you are using a nice scanner there is also a % throttle blade angle (or something like that), that i've been told has to be 0%. When fiddling with my tps it is very easy to get the voltage within the min-max except when you have to adjust for the third variable. What's everyone's thoughts on this?

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Mike

'90 IROC, 5-speed, ZZ4, & Trick Flows
~~~~~~~~~~~~~~~~~~~~~~~

 

The pin idea works good for me. Just stick it in the back of the connector and test from there.

-Jeff

 

If your readings for TPS voltage are low at WOT, I don't think you need to replace the sensor, all you have to do is adjust it right??? Just loosen the two screws that hold it in and tilt the top of it towards the back of the engine?

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The Lone V6 of the all powerful Nor-Cal crew
ICQ #: 77308896

2.8L MPFI w/ K&N filters & homemade ram air
5 speed manual
3.42 rear axle
180W Clarion CD Deck
Pioneer 4*6 in front
Polk 3 way 6*9 in back

 

you don't have to do all the jumper BS to get a good reading.. just jam the probes of your tester into the TPS wire harness.. make sure they have a good connect and go from there. Worked good with my fluke meter.
-ben

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1987 5.7L L98 GTA-

Current Mods: Gutted Cat, !MAF screens, Gutted Air Box. K&N, Ram Air, Throttle body coolant bypass, AIR system removed, 3" pipe to flowmasters, dual 12" electric fans, 4 core alum radiator, 160* stat, high output h20 pump and alternator, Accel Cap, rotor, 8.8mm wires, Bosch Plats, AFPR, Performance chip(unknown kind), Nitto NT555r 245/50/16 drags rear, Yokohama Advan 032r 245/50/16 fronts, JVC KDSX939 Head unit, Kenwood Excelon 4x6's, Kenwood Excelon 4 way 6x9's, Kenwood 606c amp, Power Acoustic Crossover, 2 JL 10w0's in custom bandpass box.
Best Run: R/T .601; 60' 2.010; 330' 5.990; 1/8 9.154@76.89mph; 1000' 11.997; 1/4 14.489@ 96.78
(only mods at that time were the K&N, exhaust,chip & no drag radials)
#077 Central Florida F-Bodies (http://www.cffb.com)

 

I've been wondering about this 2. When testing the TPS which ground should u use? The TPS sensor ground or chassis ground? By the way, the company Mid-America has the perfect tool 4 testing the TPS. It's TPS test harness which plugs inline with the TPS and 2 alligator clips coming off the reference wires 2 attach the volt meter 2. And it's only $12. www.madvet.com

 

The pin trick is the easiest and fastest way to go.Just ***** hole in middle wire with pin,clip neg. from tester to any ground, insert positive(red)into pricked hole,read voltage,with free hand open trottle read voltage at WOT adjust screws as needed total time less than 5 min.

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86 IROC mods:T.E.S.,Flowmaster muffler
T.P.I.S. airfoil,ported plenum,March
pulleys,Accel 8.8wires,supercoil,ign.mod.
RAM AIR induction,gutted MAF,
B&M shift kit,3.73 rear gears,Accel afpr,Hypertech stage 2 chip,Random Tech.cat.,Lakewood lower control arms,Lakewood adj.panhard rod
"The more I learn about women,the more
time & money I spend on my IROC"

 

If you adjust the sensor for more voltage at WOT ( from 3.8 to 4.5), wouldn't that effect the voltage at idle also?

------------------
87 IROC-Z 305 TPI
MSD 6AL & Blaster II Coil, Richmond 3.73, K&N Filters, TPIS Airfoil, TPIS AFPR, Custom Cold Air, KYB Shocks & Struts, Ported Plenum Runners and Manifold, Comp. Eng Subframe Connectors, SLP Headers, Borla 3", Hi-flo cat, TH700-R4 with TCI Pro Super Kit and 2100 rpm stall converter
www.acsu.buffalo.edu/~ermer

***** FOR SALE *****