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post #11 of (permalink) Old 12-11-2000, 01:30 PM
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Re: TPS

I understand that .98V may be the original design standard, but I also understand that the EEC-IV is a learning computer that will adapt to minor incosistencies among similar sensors, obviating the necessity to individually calibrate each vehicle coming down the assembly line and each sensor any time it is replaced. This is why Haynes and Ford say that, after a power loss or a sensor change, the engine may run rough until the computer adapts to the sensors again.

Steve
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post #12 of (permalink) Old 12-11-2000, 03:01 PM
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Re: TPS

Thanks guys for the great info. Now, if ford will get my damn sensor in, I'll be set! I swear, ford says "it'll be here in 3 working days...just come by and get it." Go over and there is no sign of it. Been 1 1/2 weeks and still not here.



post #13 of (permalink) Old 12-11-2000, 11:54 PM
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Re: TPS

Last thing,
1. the TPS doesn't effect getting an accurate timing, right,

2. but does the timing effect the TPS working right??

3. The reason why I ask is I got mine timed in today and it seems that the HIgh/Low idle problem has fixed itself?? I think I'm going crazy?!

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post #14 of (permalink) Old 12-12-2000, 03:09 PM
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Re: TPS

1) Again, not directly. See 12/10/00 8:04PM
2) No.
3) The timing will affect the idle and how the engine runs thru its entire range. Timing too retarded (after TDC) will cause low rough idle; too advanced will cause uneven idle and stalling. But the EEC-IV has a "limp home" mode in addition to its learning ability. That means that if only one or a few sensors are out-of-range, the computer will ignore them and use some programmed default values to try to keep the engine running for you. So the TPS may still be bad - Are you sure you tested it correctly?

Steve
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post #15 of (permalink) Old 12-12-2000, 04:32 PM
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Re: TPS

I haven't had a chance to check it again, however when I did it the first time I followed the Haynes book. THeir testing method should be accurate, right(not being a smartass)?


post #16 of (permalink) Old 12-12-2000, 05:12 PM
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Re: TPS

Sure, I was just asking if you were confident that the TPS is bad.

Steve
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post #17 of (permalink) Old 12-12-2000, 05:50 PM
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Re: TPS

1) Okay, thanks for the help will check it tomorrow, as I am studying for finals right now.
2) For my steering shaft, I've called a bunch of places, part houses, junk yards, etc and can't find anything. Should I just buy the whole shaft with joint? Ford wants 125.00? Or should I spend a lil more and get the one from Borgson(sp?)?
Thanks again!

post #18 of (permalink) Old 12-12-2000, 07:18 PM
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Re: Steering shaft

If you can't tell by now, I'm a BIG fan of junkyard parts. I've seen steering shafts on late-model trucks in PERFECT condition that I could have bought for $40. You may have to shop a little longer to find one you like at your price than Ford takes to get one, but then again, maybe not (as you're seeing with the TPS). I prefer OEM unless there's an obvious fault, and the late shafts have a NICE molded rubber rag joint that lasts much better than the older ones.

Steve
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post #19 of (permalink) Old 12-12-2000, 09:36 PM
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Re: TPS

I don't if my problem applies to this. When I'm in Park I will press the throttle to 2k rpm it'll hesitate for about 3 sec. then jump up to 3k rpm. This'll only happen at upper rpm's. I can feel this late surge in power when I'm driving too. Mechanics said it could be the TPS but I wanted to check with you guys before I go in and test anything. Also according to my Haynes bible only the 4.9L TPS doesn't need to be adjusted, all others do....woody

post #20 of (permalink) Old 12-12-2000, 10:09 PM
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Re: TPS

If the surge occurrs as you are slowly depressing the pedal, I would suspect the TPS of having a bad spot there. If the surge occurrs after you floor the pedal and the engine is revving up to full speed, I would suspect the MAP sensor or the fuel pressure regulator.

Steve
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