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  1. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Haven't done the voltage-drop tests yet but I figured-out why the low-speed fan was not coming on. Turns-out the high-current fuse box had been removed. The wires were just cut, folder back, wrapped in electrical tape, and then put back into the plastic harness which had its end wrapped in...
  2. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Using FORScan I found out that the low-speed fan is not working. I can hear the relay energize but the fan does not run; zero volts at the fan connector's low-speed terminal. Later I will try the voltage-drop tests you recommended on the high-speed and ground circuits. As for the part where...
  3. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    No...I have not forgotten about this problem; been living with it everyday still. :O_o: Just tonight I installed a reman'ed OEM Motorcraft alternator and the problem persists. Since the car was warmed-up I could get the cooling fan to kick-on pretty frequently by running the A/C. To rule-out...
  4. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Ahhh...good old Ohm's Law...gotta love it. What I really appreciated was your knowledge of what our radiator fan motor should pull in terms of watts and amps -very encouraging. It really seems like we've zeroed-in on the alternator. The next trick is finding a yard here that has usable Mustang...
  5. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Thanks again for the more good stuff. Just for the sake of testing (if nothing else) I took some resistance measurements on the fan motor and fan motor connector (unplugged). Below are the results of that. I think it's safe to say the connector and wiring aren't the issue. As for the fan...
  6. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Sure enjoyed those alternator rebuilding videos -thanks. They've got me wanting to rebuild mine now. Before going that route I'll check with O'Reilly Auto about doing me a solid on the alternator. I just found out that they no longer carry the model I got from them. The one I have now is 4½...
  7. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Thanks for the time and thought towards this issue, WMBurns...it's greatly appreciated. I checked voltages in a variety of scenarios and short answer: the hazards aren't having that great an effect on the charging system or engine idle (details in chart below). I found that the idle was...
  8. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Well...the alternator tested good (off the car) at Advance Auto. It was pretty quiet in their test bench, so I'm no longer concerned about the little clunking I was hearing. This brings me back to suspecting the radiator fan pulling too much or maybe the IAC is "off a bit" (if that's even...
  9. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Correction to a couple measurements (decimal troubles). When the radiator fan is on the voltage drops are: + : 0.090 - : 0.065 I retested tonight and the voltage drop measurements were the same under full-load with the radiator fan on. So I feel pretty confident there isn't a voltage drop...
  10. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    So just finished the voltage-drop test that WMBurns pointed me to and the short report is - Will take alternator to be tested. Testing details - The voltage-drop measurements when the fan was on show the reading when the fan first started and then once it was running. Since the full-load...
  11. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    As Sluggie24 suggested, I cleaned-out the IAC with B12 carb cleaner, Q-tips, and compressed air. It had some soot in there but not clumps of stuff or anything that bad. Also cleaned-out the TB passages which were just slightly sooty. End results: no change. I'll do the charging system voltage...
  12. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Thanks Sluggie24. As best I remember the idle does jump up when the A/C is on, but it does it the same way as when the radiator fan kicks-on: the idle drops low first (sometimes almost stalling for a moment) and then comes up to a bit higher than an idle without the A/C or radiator fan being...
  13. cjcoburn

    Electrical Idle Stumbles When Radiator Fan Turns On

    Hello All, I'm looking for some troubleshooting pointers on this issue where my idle will stumble/drop when the radiator fan kicks on. After a moment the idle will return to normal. Then once the fan turns off the idle will jump a bit and then return to normal. Sometimes (but not very often)...
  14. cjcoburn

    Uncentered Steering Wheel

    Heh heh :) Funny you mention that. I use to do that with Firestone. But the alignments never held, but they just kept doing them and not saying a word. Then I took the car to Brakes Plus for new rotors and they asked if I also wanted to have a bad tie-rod replaced -doh! Alignment held for a long...
  15. cjcoburn

    Uncentered Steering Wheel

    Well...after the problem first appeared I had an alignment. Everything was just fine...for about 300 miles, then the problem came back. So before getting into the habit of having an alignment every month along with checking my tire pressures ( ;) ). I've left it as is and am trying to see what...
  16. cjcoburn

    Uncentered Steering Wheel

    Did you see what was causing the problem? Like was the rag joint visibly messed-up? Just curious. Thank you very much for the link to MM's steering shaft, too. I really liked the link they had to Muscle Mustangs & Fast Fords' article about the installation and before-and-after performance...
  17. cjcoburn

    Uncentered Steering Wheel

    Now that it's gotten a bit warmer here (above 7°) I'll be taking a very close look at the rag joint. I was wondering about the rack itself, too. As far as I know it's the original from the good ol' 90 - miles: 158,712. When I bought the car it had 9x18" wheels on the front with beat tires and...
  18. cjcoburn

    Uncentered Steering Wheel

    Hmm...I'll have to take a close look at that. I did look at it and it wasn't obviously disintegrating. With a failing rag joint do you think if I turned the steering wheel fully to the right and then some that the steering wheel would be closer to centered? I ask because we've had 7"of snow...
  19. cjcoburn

    Uncentered Steering Wheel

    Hello All, The steering wheel in my '99 GT has recently become uncentered when the car is driving straight. I'm hoping some might have more ideas about what I could check. This is how my steering wheel is positioned now... This started about 1000 miles after replacing the original rear...
  20. cjcoburn

    Screaming Blown Throw-out Bearing

    I just went with a FRPP package from American Muscle and it's been working out just fine. It's been smooth, linear, not grabby. When I did the install I had the flywheel resurfaced and followed this break-in procedure (found in a Mustang forum somewhere). So far it has only 3000 miles on it -...