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| 84 Duke Auto to Manual Swap EPROM Concern (Page 2/3) |
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buddycraigg
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JUL 11, 10:23 PM
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let's rule somethings out.
IACV has nothing to do with the system after you start stepping on the gas pedal. so that's out.
Idle stop screw doesn't have anything to do with it after you step on the pedal. so that's out.
Take the top of the air filter off and watch the spray coming from the injector.
it should look like the water coming from your shower in the bathroom. Even at idle.
The throttle body has a pressure regulator built into them.
That is what I would check next.
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Derekw66
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JUL 13, 07:35 AM
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Take the top of the air filter off and watch the spray coming from the injector.
it should look like the water coming from your shower in the bathroom. Even at idle.
The throttle body has a pressure regulator built into them.
That is what I would check next.
The injector has a nice triangle shaped mist spray pattern, no concerns there.
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buddycraigg
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JUL 13, 07:33 PM
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Patrick
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JUL 13, 07:46 PM
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| quote | Originally posted by Derekw66:
I’ve done all of the things I can think of except for turning the dreaded screw on the side of the throttle body.
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I'm not sure what you think messing with the idle stop screw might accomplish... besides screwing things up even more. 
What is the actual fuel pressure?
What is the ignition timing set to?
Did you have the ALDL jumper in place when you set it?
Are the distributor cap and rotor in good shape?
Have you checked the resistance of the spark plug leads?
Have you triple-checked that the spark plug leads are attached to the correct plugs?
Will the spark jump a full 1/4" gap outside of the combustion chamber? (And no, testing with a 0.060" gap means nothing.)[This message has been edited by Patrick (edited 07-13-2023).]
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Derekw66
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JUL 13, 08:34 PM
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I'm not sure what you think messing with the idle stop screw might accomplish... besides screwing things up even more.
I don’t think it will help at all, alas, not touched even though it seems like it should to most.
What is the actual fuel pressure?
That’s something I need to do over, I was getting 30-35 when cranking but it never fired up, wasn’t my tester and it needed to go back, so that is a maybe, but fuel pump and filter are new.
What is the ignition timing set to?
8 degrees btdc
Did you have the ALDL jumper in place when you set it?
Yes
Are the distributor cap and rotor in good shape?
New
Have you checked the resistance of the spark plug leads?
Swapped all of them over with the donor car, no change
Have you triple-checked that the spark plug leads are attached to the correct plugs?
Yes but I will again
Will the spark jump a full 1/4" gap outside of the combustion chamber? (And no, testing with a 0.060" gap means nothing.)
I haven’t tried that, I’ll put it on my list
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Patrick
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JUL 13, 09:03 PM
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| quote | Originally posted by Derekw66:
That’s something I need to do over, I was getting 30-35 when cranking but it never fired up...
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Considering that the factory specs for the 2.5 duke are 9-13 psi, something's screwy here.
What fuel pump do you have installed? Sounds like you've got one for the 2.8 engine.[This message has been edited by Patrick (edited 07-13-2023).]
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buddycraigg
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JUL 13, 10:24 PM
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| quote | Originally posted by Patrick:
Considering that the factory specs for the 2.5 duke are 9-13 psi, something's screwy here.
What fuel pump do you have installed? Sounds like you've got one for the 2.8 engine.
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I was thinking more like 14 too.
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Derekw66
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JUL 14, 08:22 AM
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I’ll get another tester and confirm whats true, but I sill believe the manual ecm would have different idle parameters and throttle response logic, I’ve read in nearly all auto-to-manual swaps the ecm needed to be replaced as well.
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theogre
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JUL 14, 01:30 PM
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Yes, Duke gets 9-13PSI fuel pressure.
But Note that many Test gauge w/ 80 to 100+PSI gauges are not every accurate showing that numbers. 14 maybe ok but definitely not ~ 20 or more even with high range gauge.
Most standard gauges aren't very accurate at highest and lowest numbers of whatever numbers on the scale.
Is why I found large diameter 0-30PSI gauge and install that in the test set.
Plus needs TBI test Adapter.
https://www.fiero.nl/forum/Forum2/HTML/146121.html
High Pressure can cause ECM setting code 45 and can be several things...
Iffy regulator
pinch return line
crap blocking return line
can kill the pump at high pressure too because often reduce fuel flow means can cool or lube right like that, Worse if tank is near empty because no external gas to help cooling.------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave
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Derekw66
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JUL 15, 07:36 AM
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So no one thinks an automatic ECM being in a now manual car can cause this issue? Just trying to rule this out as a possibility.
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