AOD Transmission trouble
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AOD Transmission trouble
Hi everyone, I have an 86 f150 with a 302 coupled with an AOD and its started acting up. After driving about 5 minutes, when I try to accelerate, the truck tries to stall so I gently increase speed and then the transmission starts jumping and jerking. Then once I get past the jerking and up to highway speeds nothing goes wrong until I start to slow down and it jumps a little bit when I'm stopping.
Is my transmission toast?
Is my transmission toast?
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From: Denver Metro Area, CO
Before you condemn the transmission, ask the engine management computer what it thinks is going on. IOW pull the codes.
Fuel Injection Technical Library » How To Run a Self-Test
Fuel Injection Technical Library » How To Run a Self-Test
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Before you condemn the transmission, ask the engine management computer what it thinks is going on. IOW pull the codes.
Fuel Injection Technical Library » How To Run a Self-Test
Fuel Injection Technical Library » How To Run a Self-Test
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Ok. I broke down and bought a code reader. I know I could do the blinking light method but having the reader will help in the future IMO.
I just don't know what the codes are trying to tell me.
For my KOEO codes I got:
87
54
When I did the KOER:
21
41
32
77
25
I just don't know what the codes are trying to tell me.
For my KOEO codes I got:
87
54
When I did the KOER:
21
41
32
77
25
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From: Denver Metro Area, CO
There are links to the code interpretations at the bottom of that self-test page I posted earlier.
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Code 54 on the KOEO was a CM. ACT circuit is open. Does that mean a bad wire or the sensor itself is bad?
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Yeah, you're right, Charlie, the AOD is all mechanical and isn't computer-controlled, I know that.
But, I'm encouraging the OP to investigate the engine before condemning the transmission because, what may appear to be a transmission problem, is often not the case at all. At least in my experience.
He's saying the engine "stalls" when he tries to accelerate, and some of his codes are referring to fuel pumps not getting the correct voltage. It also looks like the computer perpetually thinks the engine is cold (not warmed up) based on the ECT showing up.
I'm just trying to take care of what is known to be wrong before trying to find problems with something that may be OK and is just exhibiting symptoms of problems being upstream.
BTW thanks for stopping by!
But, I'm encouraging the OP to investigate the engine before condemning the transmission because, what may appear to be a transmission problem, is often not the case at all. At least in my experience.
He's saying the engine "stalls" when he tries to accelerate, and some of his codes are referring to fuel pumps not getting the correct voltage. It also looks like the computer perpetually thinks the engine is cold (not warmed up) based on the ECT showing up.
I'm just trying to take care of what is known to be wrong before trying to find problems with something that may be OK and is just exhibiting symptoms of problems being upstream.
BTW thanks for stopping by!
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Welcome to the joys of early-era computerized engine management, you have to troubleshoot the true cause on your own. Could be bad wiring, bad connections, bad sensor, bad grounds, etc. etc. etc.Locate your ACT sensor and investigate from there.
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I saw that after i responded. Doing good here. Stripping the 82 this week, pm me your info so I can send you your want list. It tried to break my arm earlier in the week, so It's time for it to go.
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You don't know. And, we here certainly won't, either. Welcome to the joys of early-era computerized engine management, you have to troubleshoot the true cause on your own. Could be bad wiring, bad connections, bad sensor, bad grounds, etc. etc. etc.
Locate your ACT sensor and investigate from there.
Welcome to the joys of early-era computerized engine management, you have to troubleshoot the true cause on your own. Could be bad wiring, bad connections, bad sensor, bad grounds, etc. etc. etc.Locate your ACT sensor and investigate from there.
I think I had to replace the ACT a year or so ago and remember it acting funky and stalling like this problem so hopefully just a bad wire was the problem.
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For the code 87, find the fuel pump relay, it's the green one ( brown one is ecm), and check the connection. They have a habit of rotting off inside, and sort of still functioning. if the connector itself is too corroded beyond cleaning, Napa sells a patch kit.
Have you put a guage on the fuel line yet to see what your pressure is?
Have you put a guage on the fuel line yet to see what your pressure is?
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The ECT code isn't good, either - computer doesn't know the engine has warmed up so it'll run rich. The fuel pump stuff isn't good, either, it wouldn't surprise me if this was the cause of your apparent stalling.
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After a quick drive to the store and back its running like it used to. Now I need to address the other issues but will have to tackle them in the morning.
The ECT is located next to the distributor right?
The ECT is located next to the distributor right?