View Full Version : Got a question about this 58 mm throttle body???
11-20-2003, 09:10 PM
I got the throttle body on.... the port was very easy.... if this stops you from doing a 58mm then you shoudl be working on FORD's. But just a bit of advice.. we got a mini high speed air grinder... it make cake out of the work.... we had both ports done in about 20 minutes and everything back together it 2 hours tops. But my question is.. is say in the instructions that the possibility of drilling the two screw holes on the TPS out may be nessacary, making them elongated to adjust the TPS if its out of whack... but it says check if the voltage to the TPS is correct... well WHAT IS THE STOCK TPS VOLTAGE?? AND HOW DO I KNOW IF ITS OUT OF WHACK? i mean it seems its a lil rough.. but will it be like that till the computer adjusts??????
I believe its 1.0 V , but many have argued that it should be between .50 and .70 . I have read mine in the past and its at 1.2v
11-21-2003, 02:25 AM
This is straight from the Haynes manual.
Locate the TPS on the throttle body. Using a voltmeter check the REFERENCE voltage from the ecm/pcm. Install the positive probe (+) onto the gray (reference wire) and negative probe (-) onto the black (ground wire). The voltage should be about 5.0 volts.
Next check the TPS signal voltage. With the throttle fully closed, install the (+) probe of the voltmeter onto the dark blue wire and the (-) probe onto the black wire. Gradually open the throttle valve and observe the TPS sensor voltage. Observe a smooth change in the voltage values as the sensor travels from idle to full throttle. The voltage should increase to aproximately 4.5 to 5.0 volts. If the readings are incorrect, replace the TPS sensor.
An alternate method of diagnosis is by the use of an electronic scan tool. Install the scan tool and switch to the TPS mode and monitor the voltage signal at idle and then at high rpm. The scan tool should read between 1.2-1.6 at idle and 4.5-5.0 volts as you increase the rpms by opening the TB.
Hope this helps ya out
11-21-2003, 09:44 AM
thanks guys after about 20 minutes it ran just like normal agian but i am goin to check it just to be sure....the throttle response when the rpm's get up there is alot better now........this was a fun upgrade!!!
11-25-2003, 11:45 PM
Odd. every stock car I have ever checked sits at .80 or so straight from the factory ;)
11-26-2003, 03:52 AM
I never said that the Haynes book was right :)
11-26-2003, 10:23 AM
ok unfortunately through u guys' responses i haven't really got a straight answer(i don't mean that ungratefully) everyone thinks something different, so which one is right????LOL.... what is the voltage.... or at least where could i check for sure????
11-28-2003, 05:23 PM
All the cars that I work on Leave at 0.65-0.70..flat out. I adjust the IAC to 20-30 HOT out of gear.
60 or so cars no complants ;)
11-29-2003, 06:26 AM
hmmm well i looked at that last night at it was at about .51 or so... so should it be a lil higher then....
11-29-2003, 06:33 AM
Ok... im lost i think what is IAC??? i thought i was messing with the TPS??? and i checked it when it was warm just idling in park????? it seemed to me that when i adjust the TPS more than what it is right now it just changed the idle and bumps it up to like 1,100 or 1,200, am i doing something wrong???
11-29-2003, 12:47 PM
The IAC adjustment is the screw on the TB in the back by the Throttle linkage. Usually you need to adjust both at the same time and do a key off restart after each adjustment.
When ever you make a change you need to do a restart so the PCM resets it self to new settings ;)
12-01-2003, 09:34 AM
ok... wel every time i adjust the TPS is just changes the idle...RAISES IT!!! my car is a speed density car if that makes any difference.... so will this still work for my car now???i mean im lost b/c if the idle screw changes idle.. and the tps changes ilde how will that adjust my idle with raising my idle.. cuz i don't want to change the rpm idle i just want to make it idle smooth ya know???
12-01-2003, 09:56 PM
yes it will work fine SD or MAF ;)
SD cars respond beter to the fine tuning then the MAF cars.
12-02-2003, 10:08 AM
ok well i will try that here in the next few days and let ya know how it worked....
12-02-2003, 10:12 AM
the guy that posted the online repair manual....GAVE ME THE ANSWER.....THAT ONLINE REPAIR MANUAL IT KICK *SS. Im goin to try it tonight...
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