Mystry ECM
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Mystry ECM
My 1988 Ford F150 with 302 and 4 speed auto has an ECM #E8TF-12A650-F2A 8pV. I am being told that ECM is for a Bronco and could not be in my truck. I am trying to get a replacement for my truck, can't find one that matches. Does anyone know what my ECM is supposed to find and how to find out which one I actually need?
Thanks in advance,
Owen
Thanks in advance,
Owen
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Simple as dirt
I am sure of the 302 and the transmission code is T on the cab door opening. I can't find a supplier in Richmond VA that can supply one of these ECM's they have no listing in the system for them. They think the Federal Emmisions one might work but I hate to pay over $100 for an experiment. Any suggestions?
Fleet Owner
Joined: Oct 2005
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From: Kentucky
There is one for $121 on E-bay right now: 1987-89 F150 BRONCO ECU 5.0L E8TF-12A650-F2A 8PV AT
Next question is why do you think you need a new Powertrain Control Module (PCM)?
Next question is why do you think you need a new Powertrain Control Module (PCM)?
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Why am I sure
From ealier post today:
I have a 1988 F150 with 302 and automatic and PS. It appears that the idle air valve is not getting proper voltage. I read 12.85 v from red lead to ground and nothing accross the leads. I tried a new valve that did not help. The computer codes read 15, 23, 33, 35. Could this problem be caused by the ECM or would something else cause the valve not to work. When I take my foot off the pedal at idle the engine dies. Some times the engine will run at very low idle speed if it has been driven a while.
No one replied to the above post.
Owen
I have a 1988 F150 with 302 and automatic and PS. It appears that the idle air valve is not getting proper voltage. I read 12.85 v from red lead to ground and nothing accross the leads. I tried a new valve that did not help. The computer codes read 15, 23, 33, 35. Could this problem be caused by the ECM or would something else cause the valve not to work. When I take my foot off the pedal at idle the engine dies. Some times the engine will run at very low idle speed if it has been driven a while.
No one replied to the above post.
Owen
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
The theory for how the Idle Control works is here: Ford Fuel Injection » Idle Air Bypass (IAB) The supply voltage is supposed to be in the 12-14 voltage range. The return on the other hand is controlled by the PCM. As the theory explains the PCM modulates the return multiple times per second. Measuring it with a meter is not going to work very well.
What you can do is trace the return wire back to the PCM and verify it is not open. Your DVM will work very well for that purpose.
The code 23 you listed could be the cause of your low idle speed problem. Code 23 indicates the TPS voltage is higher or lower than it should be when the throttle is closed. The typical signal output is between 0.6-1.0 VDC. You can use that meter of yours to check the TPS output signal. The EGR codes also need to addressed as well.
TPS references:
Ford Fuel Injection » Throttle Position Sensor (TPS)
FullSizeBronco.com - Ultimate TPS Thread
What you can do is trace the return wire back to the PCM and verify it is not open. Your DVM will work very well for that purpose.
The code 23 you listed could be the cause of your low idle speed problem. Code 23 indicates the TPS voltage is higher or lower than it should be when the throttle is closed. The typical signal output is between 0.6-1.0 VDC. You can use that meter of yours to check the TPS output signal. The EGR codes also need to addressed as well.
TPS references:
Ford Fuel Injection » Throttle Position Sensor (TPS)
FullSizeBronco.com - Ultimate TPS Thread
