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Poll

motorcraft TPS vs other name brand TPS

Total Members Voted: 9

Topic: Which tps do you prefer? (Read 2076 times) previous topic - next topic

Which tps do you prefer?

Reply #15 –
The '87-'88 TC and other 2.3s are adjustable, original 5.0s are not... If its not in the .7-.9v range with the IAC disconnected and the base idle set about 550 rpms(hot, stockish engine. If it has a cam 800-900 is more the base idle range and what I use), I'd be filing the holes and setting it in that range. I had to do the same on my 5.0 as voltage was at 1.1v on the Motorcraft TPS that came on my new 65mm T-Body....

The stalling problems occurs when the base idle is at a point so low the engine will stall with the IAC disconnected. This was the problem with a lot of the early port EEC-IV engines(I had this problem on a fairly new '90 Aerostar, that at the time no one knew what the fix was). As the throttle body became carboned the base idle would decrease, eventually getting to a point the IAC had problems responding quickly enough to maintain idle without stalling occasionally. This is why the air adjuster plate was devloped, so the base idle could be increased without resetting the adjustment on the throttle plate and upsetting the TPS voltage(this fix assumed it was in range). The theory was, install the adj plate and leave the T-Body dirty so no adjustments should be required in the future. Of course cleaning the TB and saying piss on the air bleed adaptor would have done the same thing... But would require preodic cleaning of the TB...

Which tps do you prefer?

Reply #16 –
wow so 5.0s cant be adjusted . wow someone here told me a site were the turbo coupes have adjusted tb and that you have to do teh same thign for the 5.0 . I guess i wated my time doing that. Well i checked teh dc voltage and it was 1dc at idle and with engine off key on and pressed the gas up anbd down and increaded to 5 dc and decreased back to 1 dc . and also replaced it with a motor craft. Is the dc good?
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Which tps do you prefer?

Reply #17 –
Quote from: tbirdera;109508
wow so 5.0s cant be adjusted . wow someone here told me a site were the turbo coupes have adjusted tb and that you have to do teh same thign for the 5.0 . I guess i wated my time doing that. Well i checked teh dc voltage and it was 1dc at idle and with engine off key on and pressed the gas up anbd down and increaded to 5 dc and decreased back to 1 dc . and also replaced it with a motor craft. Is the dc good?


Re-read my previous post till you understand what I'm saying... The TPS voltage is secondary(but none the less important) to the base idle setting...
 

Which tps do you prefer?

Reply #18 –
In theory, there is no way to adjust the idle without a tuning device. If you turn in the throttle stop screw without having the TPS voltage go above 1.1V (& you can "adjust" it lower it if it does go above 1.1V), then you may be able to stop the stalling. The Idle Air Control (IAC) may not be working properly after that, but it may help - it's how I used to do it before I got the TwEECer.

You can make sure it is adjusted properly by doing what TC50 was saying. Disconnect the IAC valve. Start the engine and set the idle to ~550RPM with the throttle stop screw. Check to make sure TPS is within ~ 0.8V - 1.1V. Reconnect IAC & restart the car - this should get it close to where it should be. There are writeups on how to do this posted on the some tuning & other sites.

Oh, and 1V at idle & 5V at WOT is good, except I hope you have higher accuracy than that. I would rather see numbers like 1.03V @ idle & 4.72V at WOT. 1.26V rounds down to 1V, but this would mean the TPS is out of range!
11.96 @ 118 MPH old 306 KB; 428W coming soon.