I pulled the codes on the 91 and the TPS, ECT, AIT, MAP and EGR came up as trouble makers. The catch is that they all use the same ground; pin 46(grey with red stripe). .15 volts at all sensors sharing this wire. I unplugged all sensors systematically. Maybe there's a physical break in a sensor causing a voltage leak? Nope. Fuck it, Ill get a new ecu. Nope. Same exact issue. I pull the connector off the ECU, snip the wire, ground the sensor side to the body and take a reading on the ECU side of the wire. .20 volts while running. Wtf? Sensor side; KoEo; 5 volts. Wtf. I was really hoping to get this straightened out because if i do an HO swap and the ECU wasnt the prob, Ill still have issues with an A9P or A9L. I need help!
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1992 SHO(what's left of it)
1986 F-150(rust and option free)
1950 Studebaker pickup(moves-kinda, stops-no)
1987 T-bird(dead 3.wait, SHO swap in store)
1991 CV $500 cream puffF -
If memory serves, thats the orange ground wire that bolts to the back of the intake manifold. It comes out of the oxygen sensor harness and bolts either to the lower or to the back of the head. Its often broken or just forgotten about.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers -
Don't forget the small ground at the battery too... what are your symptoms?Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
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85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereoComment
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Yup, the one on the back of the intake gave me the run around for about a month after I did the H.O. swap on my old '91.
'90 LX 5.0 mustang
Big plansComment
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Hunting or 'surging' at idle. It doesnt matter if its cold or its been running for hours. When u start it, it surges up and down sometimes to the point of dying and sometimes off idle hesitation when accelerating.Originally posted by 85crownHPP View Post1992 SHO(what's left of it)
1986 F-150(rust and option free)
1950 Studebaker pickup(moves-kinda, stops-no)
1987 T-bird(dead 3.wait, SHO swap in store)
1991 CV $500 cream puffFComment
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yea make sure the o2 harness ground is bolted to the back of the intake.
1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
2006 Lincoln Town Car Signature. Stock for now
1989 Ford F-250 4x4 much much more to come, sefi converted so far.
1986 Toyota pickup with LSC wheels and 225/60/16 tires.
2008 Hyundai Elantra future Revcon toad
1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)
please be patient, rebuilding an empire!
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Each O2 sensor has it's own ground on the back of the intake. I think the bolts are really in the back of the head. Really a pain to get to. Both sides should both feed into a common connector which could also be buried back there. The 2 big connectors (salt and pepper shakers) at the back of the engine also develop bad connections The actual computer ground goes right back to the battery. It's a small round single wire connector right off the battery post ground. That's taking for granted it's like my 86 GM or my brothers 85 TC.Comment
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there are actually three computer grounds. One to the battery, one to the engine block, and one to the body right next to the hood hinge. The one on the engine is the reference ground for the sensors, since there can be a few tenths of a volt difference between battery ground and engine ground due to dirty cables or whatever. Don't rightly know what the body ground is used for, maybe just shielding or something.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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FOUNDIT!!!!!! Those goddamn 10pin connectors!!!! I was reading on oldfuelinjection, and came across the 10pin article. I sprang into action, cleaning terminals and adding die electric grease and shes smooth as silk. DAMN YOU, TECHNOLOGY!!!1992 SHO(what's left of it)
1986 F-150(rust and option free)
1950 Studebaker pickup(moves-kinda, stops-no)
1987 T-bird(dead 3.wait, SHO swap in store)
1991 CV $500 cream puffFComment
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Cool. Its a 20 year old car though. If thats all that was really wrong with it, you're doing OK.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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Are you talking about one of the 'salt and pepper' connectors where the bulk of the engine wiring comes out of the ECM harness? How bad was the crud?Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
sigpic
85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereoComment
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Ya. Its not the same as a fox. Theyre smaller plugs(black and grey) that lay over the drivers side valve cover. And the crud was surprisingly minimal. But, i would encourage everyone to do some p.m. on this area and just blow it out with some compressed air, drop some die electric grease or equivalent and get that shit straightened out. At the very least, it should give u peace of mind and only take about 10 min to do. Good luck everyone and thanks for responding!Originally posted by 85crownHPP View Post1992 SHO(what's left of it)
1986 F-150(rust and option free)
1950 Studebaker pickup(moves-kinda, stops-no)
1987 T-bird(dead 3.wait, SHO swap in store)
1991 CV $500 cream puffFComment
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black and grey smaller, hmm, sounds like the trans harness (black) and the oxy sensor harness (grey). The ground wire from block to ECM is in the oxy sensor harness.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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