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| 1988 2.5 ECM wiring (Page 1/1) |
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Firezappy
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APR 24, 06:32 PM
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Hello, I cannot for the life of me get a good connection with my wiring to the ecm. I have at this point soldered some wires directly to the pcb, and still even just to much vibration makes the other wiring lose connection. You so much as touch it and bam, the engine stops because the fuel pump stops. There are two plugs that go into the back of the ecm, I am trying to find out how to replace those. I do not even know what they are called, or a part number. Any tips?
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olejoedad
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APR 24, 11:40 PM
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Could you post up a few pics?
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Firezappy
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APR 25, 01:28 AM
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Sure, the cables in the circle are the issue. If you so much as touch them it messes with the cars idle, firing, or fuel pump. They are driving me nuts.
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phonedawgz
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APR 25, 05:33 AM
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Have you pulled the board out of the case and looked for loose components?
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wftb
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APR 25, 08:17 AM
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Put it all back together, remount it properly and make sure all the grounds are attached properly. If that does not help then you need to check continuity from one side of the connector to the other and gently flex each wire till you find a poor connection. ------------------
86 GT built 2.2 ecotec turbo
rear SLA suspension
QA1 coilovers on tube arms
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theogre
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APR 25, 11:46 AM
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DIY "fixing" ECM plugs and other things often creates More problems now or down the road in middle of night or on highway in rain far from home.
Those Plugs are likely just fine but ECM is dying causing problems.
Most ECM "Dies" from heat and crack solder joints. Plus Many Old GM ECM units have problems right from the factory because board "paint" swells and can crack chips off the board.
Just Touch the plugs will often make the board to move some and set off crack joints. More so when you remove ECM cover that is part of mounting the board in it and heat sink for driver "chips" "bolted" to the intermediate heat sink on the board.
A GM official test is to tap the ECM w/ fingers and watch motor and MIL. This Tapping along can set off crap joints anywhere on the board and motor instantly dies or has other problems, set bogus codes, etc.
1 typical example w/ this ECM is no "signal" to run fuel injector after running then parked over night. The driver chip (1 of several MOSFETs) has crank joint(s) for heat cycling and cooling down finally "kills" it and won't start.
But This Won't kill the Fuel Pump unless FP wiring has other problems because Oil Pressure Switch will keep that On even w/ FP Relay turns off or dies.
Save the PROM to use w/ new/rebuilt ECM from Cardone etc.
See my Cave, ECM Heat------------------
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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