1985 duke dieing issue, on and on it goes ! (Page 3/4)
fierosound JUL 19, 06:49 PM

quote
Originally posted by Lou6t4gto:

I CAN read the "flashing codes" by jumping it (Has NO Codes !) But what I Cannot do it (using a "SCANNER")
to SEE "what it's DOING when it's DOING IT". it only shows Codes AFTER the fact". and it shows NO Codes



Gotcha... http://www.reddevilriver.com/aldl.html
Lou6t4gto JUL 20, 11:57 PM
here is a list of Whats NEW in this car: (1985 fiero 2.5 /auto) All PARTS less than 100 miles

Fuel pump, hose, pickup, filter, regulator, throttle body, IAC, Map, TPS, Fuel injector, fuel pump relay
dist pick up coil, ICM, rotor, cap, wires, plugs
rebuilt ECM, ALL temp senders/sensors,(air and fluid)
O2 sensor
has 10 psi fuel pressure at all times (even when it quits)
Extra "Grounds" from bat to engine, engine to frame, frame to body* holds at 14 volts running, drops to 12.5 after it dies*
all connections are clean and tight
engine (2.5) has 10k since total rebuild * automatic
The car has run "flawlessly" for 4 years, then out of the blue it started this: stalling at a light thing, ac on, ac off, with Lockup disconnected,
the only thing NOT changed yet is the ign switch (Not Key switch)
the car idles just fine, then (with Fuel pressure gauge hooked up) it will die while maintaining 10PSI.
I believe I have already looked into or replaced "all the known suspects".
I'm out of ideas ! Anyone local to me have a machine that can Properly monitor this thing while it does it's dieing thing ???
Lou6t4gto JUL 21, 12:00 AM
should ad this, it will do it open or closed loop !
cebix JUL 21, 02:52 AM
My bet is electrical. Either the ignition is failing or there's some loose/corroded wire/connection you haven't found yet.
Lou6t4gto JUL 21, 02:04 PM
a new ignition COIL is on the way, after that, I'm out of ideas. already checked all the connections. cannot FIND anything "when it's not in the act of dieing". it immediately fixes itself, and starts right up. COULD the ORIGINAL "Oil Sender" cause it to shut off fuel supply, then on restart the fuel RELAY brings it back up ???
cebix JUL 21, 02:24 PM

quote
Originally posted by Lou6t4gto:
(...) already checked all the connections(...)



Have you, really? With an ohm-meter across an unplugged wire and wiggling it to see if it breaks connection? ECM reset wire? I had a somewhat "similar" problem to your when my positive battery cable to the junction box was corroded inside the insulation. Couldn't see it. Only realised it was it when I wiggled it when running the engine and it died.

About the oil sender - nope. It acts parallel to the relay. If you hear that pump run, you've got fuel. You also said you've got steady fuel pressure, so no problem there.
Dennis LaGrua JUL 21, 02:43 PM
Once thing for certain; you are either losing ECM power, spark or fuel. Does the tach work correctly? If not the tach filer may be shorting. Borrow a scan tool and do a datalog.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Lou6t4gto JUL 21, 04:59 PM
I "THINK" I finally got it. the ignition Switch was the LAST thing I was "replacing", (Of course they sent me the wrong switch), BUT, the Main" PLUG" going onto the switch, with the main red and yellow 10 gauge wires, the "plastic Plug" was burned at the yellow and red, the wires and switch are fine, But it HAD TO BE a loose connection to generate the HEAT to melt the plastic!
so far so good, Probably should Not Celebrate yet, But I'm "thinking" after all this, I finally found it. Heres hoping
Dennis LaGrua JUL 24, 10:01 AM
Lou welcome to the "its driving me crazy club" . Sounds like you found the problem. I should have mentioned that as I experienced a intermittent ignition switch failure once myself but it was years back. Good job and congrats for staying with it. Problems such as this can make one feel like setting the car on fire but for every problem there is a solution. A good lesson to be shared with everyone.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Lou6t4gto JUL 27, 03:42 PM
I should have know better ! after changing to the rebuilt computer, today it acted like it was running out of fuel Twice and did NOT want to start right up again. 5 min before that the converter WAS "locking up" trying to stall it below 25mph. when the (running out of fuel thing happened) it would not start right up ! after coasting to a side road, it did start up again, so at least I did not end up Walking ! going to put the orig computer back in and see what happens. oooooh.......