North American Turbocoupe Organization



Yea! Codes galore...
P.S.I. Clone Offline
Junior Member
#1
Here is the story in a nutshell:
When I bought my TC it was stumbling, bucking all the time (boost/no boost, cold or hot). I replaced the dist with a rebuilt one from napa and got a new TFI from ford. Also replaced the cap, rotor, wires and plugs (all ford cept plugs...autolite). Car runs a LOT better than it did, but still has issues. I decided to pull the EGR and clean out all the gunk in it (yuch! darn near clogged)... But I still have some hesitation when not under boost. If I cruise at a steady speed (45mph) I can feel the power drop off a little and then come back (the CEL looks almost like a turn signal in the dash [Image: biggrin.gif]). I ran the codes today and got a laundry list of them... here they are-
1st set:
81,83
2nd set:
14,42,58,63,66

My cooling fans don't come on EVER (I jumped the pressure sensor in the AC line to keep the fan on) I set my idle to 950-1000 with the IAC disconnected, but with it connected it always idles at 1500-1700 (I cleaned out the IAC as well).
Mods to the car:
K&N cone filter
removed boost control (causing one of the said codes)
Flowmaster mufflers (before I bought it)

BTW... All problems exsisted before I modded the car. So... where should I start?
1968 Mustang 3.3
1988 TurboCoupe 2.3
1992 Mustang 5.0
1994 Thunderbird 4.6
1999 Intruder 1.5

Too many cars, too little time to maintain them!
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B_Lieder Offline
Senior Member
#2
14--PIP sensor
42--Running Rich
63--TPS ciruit below minimum voltage

Thats the ones i can think of off hand. Now When you set the IAC to 950 did you reset the TPS? The PIP (14) could be your bucking, it was for me, but since you bought a rebuilt distributor from NAPA you may have gotten a lemon dizzy.

Hope this helped
Bill L
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Pete D Offline
Administrator
#3
81 = missing BCS
83 = open or shorted relay in the IRCM. Could be the no fan issue.

14 = missing PIP signal. Could be from before the new dist.PIP/TFI/plug wires.

42 = 02 sensor is reporting rich. Something is causing theeengine to run rich. Might be an 02 sensor, but more likely problem is something else like too much fuel pressure or a bad ECT under reporting coolant temps. Bad ECTs don't always set a code.

58 = VAT. Was if less than 50* when you pulled the codes?

63 = TPS voltage below test minimum. A good place to start. See the technical articles on setting idle and testing/setting the TPS. The proper way to set the idle is to set it to 700-800 with the IAC unplugged (engine warmed). Then when you plug it back in idle should settle to 1000 automatically if the TPS is good and propely adjusted.

66 = VAF. signal voltager too low. Since you got both a VAT and a VAF code, check the connector for corrosion, pins pushed out of place, loose connection. Reach in and see if the door inside the VAF moves freely. If it's sticky that's a problem.

Fix the TPS and get the idle properly set and check the stuff related to the VAF/VAT then pull the codes again and see what comes up.
Pete Dunham


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Resurectedbird Offline
Senior Member
#4
mine did that pretty much all the time, turned out to be the TPS, check the resistance sweep. That is most likely your problem.
Currently birdless, but will get another someday!
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P.S.I. Clone Offline
Junior Member
#5
Woo Hoo! Here is an update on whats going on...

While driving today with the IAC connected the idle started hovering at 2500RPM! So I disconnected the IAC (you know, a racing engine at a stoplight makes the cops look at you) and brought the idle down to 1000RPM. Now at a stop the idle will settle down to 1500, then a few seconds later will drop to 900 and idle real rough. I ordered a new O2 sensor and TPS sensor (get them at whosale for $30 each) and see what she does. I back probed the TPS and got 1.24 closed and 4.8 wide open. I haven't had a chance to adjust it yet... have to wait till lunch.
1968 Mustang 3.3
1988 TurboCoupe 2.3
1992 Mustang 5.0
1994 Thunderbird 4.6
1999 Intruder 1.5

Too many cars, too little time to maintain them!
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P.S.I. Clone Offline
Junior Member
#6
I'm also ordering a coolant temp sensor from ford (the other parts I ordered will be here in the hour) but it will be a few days till I get it. I'll see if this helps the cooling fans and rough idle... I'm thinking that the coolant sensor is keeping the car in "warm up" mode. We shall see...
1968 Mustang 3.3
1988 TurboCoupe 2.3
1992 Mustang 5.0
1994 Thunderbird 4.6
1999 Intruder 1.5

Too many cars, too little time to maintain them!
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Resurectedbird Offline
Senior Member
#7
to check your TPS-you can't just check it with the throttle colsed and full open. back probe the terminal and watch the signal voltage as you slowly open the throttle (key on engine off-should go without saying) but watch the reading, it should be nice and smooth, no spikes or drop offs. it is usually best to use an analog DVOM for this. mine was good at idle and WOT but only had one good spot at 2/3 throttle, the rest was open.
Currently birdless, but will get another someday!
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Resurectedbird Offline
Senior Member
#8
to check your TPS-you can't just check it with the throttle colsed and full open. back probe the terminal and watch the signal voltage as you slowly open the throttle (key on engine off-should go without saying) but watch the reading, it should be nice and smooth, no spikes or drop offs. it is usually best to use an analog DVOM for this. mine was good at idle and WOT but only had one good spot at 2/3 throttle, the rest was open.
Currently birdless, but will get another someday!
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P.S.I. Clone Offline
Junior Member
#9
Resurectedbird-
Sheish! I get it! You really only need to tell me once! [Image: biggrin.gif] Just kidding man...

So I swapped the O2 sensor and the TPS and started her up... same old thing (stumbling, stalled) So I checked again and... DOH! The reference vac line had come off the inbetween the regulator and the intake! So I put that back together and she fired up nice and smooth. I reconnected the IAC and the idle sat at 1100-1200. I haven't had a chance to drive it yet (I'm still closing shop right now), but I will post after my drive home.
BTW, when I worked on the car yesterday, the vac line was connected (I took it off to see if I could smell gas in the line), I guess when it came off the car had the high idle (due to a very LARGE vac leak). I also ran codes and got these:
23
81
83

14
41
63

I ran codes right after I swapped the parts out. Another funny thing... when I removed the O2 sensors (a EASY job BTW, only wish my 4.6 bird was that easy) It was really white. Almost like plugs when the engine is running lean... Do you think this was caused by the O2 sensor being bad and sending a false rich signal and forcing the car to run lean? When I replaced the O2 sensors on my LX I had the opposite problem. The codes were saying that the right bank was running lean and it was way rich (read: passing a cali smog check by 1 PPM!!!). After swapping the O2s in her, the car woke up again and felt like it lost 200 pounds (eh, till the computer died and hung open an injector... tisk tisk) Oh well. At least I have the TC to drive (damn premium gas!)
1968 Mustang 3.3
1988 TurboCoupe 2.3
1992 Mustang 5.0
1994 Thunderbird 4.6
1999 Intruder 1.5

Too many cars, too little time to maintain them!
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P.S.I. Clone Offline
Junior Member
#10
So... This is what it's like to drive a fully opernational car! I haven't set the TPS or fixed the fan issue, but I was able to drive home with out the CEL comming on once... Thats a first EVER!
1968 Mustang 3.3
1988 TurboCoupe 2.3
1992 Mustang 5.0
1994 Thunderbird 4.6
1999 Intruder 1.5

Too many cars, too little time to maintain them!
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