Please help -- URGENT!! :(
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Junior Member
Joined: Aug 2004
Posts: 2
Likes: 0
From: Valdosta, GA
Please help -- URGENT!! :(
I have a 1988 F150, 2WD, AOD Automatic, with a single gas tank. It has a 302cid (VIN "N").
It had run perfect up to this point. I went to start it this morning to warm it up, and it stalled after 3 minutes. I went to restart it, and it refused to start. I let it sit a while, tried it again, and it started, ran for 3 minutes, and stalled. The computer had been suspect for a couple of things in the past, and after checking several things, including getting trouble codes, I replaced the computer. The intial codes were: 11 (system pass, Key on, engine off)
13 - Controlled idle out of range
18 - Spark output signal (SPOUT circuit fault) OR Erratic IDM, ECM, SPOUT circuit fault OR no tach signal to ECM
41 - System running lean
When I installed the new computer, it would not start. It would act like it was going to start, but when the key was released, there was nothing. Just out of curiosity, I pressed on the accelerator while turning the key (I know, shouldn't do this with EFI), and it would actually rev and run real rough, but when I released the key, there was again, nothing. After several attempts, I put the scanner on it, and got code 11 (system pass, Key on, engine off). I also got three trouble codes from the continous memory:
18 - Spark output signal (SPOUT circuit fault) OR Erratic IDM, ECM, SPOUT circuit fault OR no tach signal to ECM
53 - Throttle position sensor above maximum voltage
87 - Primary fuel pump circuit failure
I checked the fuel pumps (frame mount and tank), and both operate. The fuel injectors are firing properly, I have good spark, and the fuel filter isn't that old. I checked for fuel pressure on the fuel rail, and it squirted out a little. It gushed when the engine was cranked. Idle air control valve is in the proper range. I haven't checked the throttle position sensor yet.
The truck has 158,000 miles on it, and this is the first problem it has ever had (other than a dead battery once).
Any ideas? This is my only vehicle, and I have no way to work or the fire department (I volunteer)!!!
It had run perfect up to this point. I went to start it this morning to warm it up, and it stalled after 3 minutes. I went to restart it, and it refused to start. I let it sit a while, tried it again, and it started, ran for 3 minutes, and stalled. The computer had been suspect for a couple of things in the past, and after checking several things, including getting trouble codes, I replaced the computer. The intial codes were: 11 (system pass, Key on, engine off)
13 - Controlled idle out of range
18 - Spark output signal (SPOUT circuit fault) OR Erratic IDM, ECM, SPOUT circuit fault OR no tach signal to ECM
41 - System running lean
When I installed the new computer, it would not start. It would act like it was going to start, but when the key was released, there was nothing. Just out of curiosity, I pressed on the accelerator while turning the key (I know, shouldn't do this with EFI), and it would actually rev and run real rough, but when I released the key, there was again, nothing. After several attempts, I put the scanner on it, and got code 11 (system pass, Key on, engine off). I also got three trouble codes from the continous memory:
18 - Spark output signal (SPOUT circuit fault) OR Erratic IDM, ECM, SPOUT circuit fault OR no tach signal to ECM
53 - Throttle position sensor above maximum voltage
87 - Primary fuel pump circuit failure
I checked the fuel pumps (frame mount and tank), and both operate. The fuel injectors are firing properly, I have good spark, and the fuel filter isn't that old. I checked for fuel pressure on the fuel rail, and it squirted out a little. It gushed when the engine was cranked. Idle air control valve is in the proper range. I haven't checked the throttle position sensor yet.
The truck has 158,000 miles on it, and this is the first problem it has ever had (other than a dead battery once).
Any ideas? This is my only vehicle, and I have no way to work or the fire department (I volunteer)!!!
Senior Member
Joined: Dec 2004
Posts: 891
Likes: 1
From: Lost some where in the middle of the Ozark Mountains!
What were the other symptoms prior to replacing the PCM? How does it crank? From the description the sugestions would be an almost endless list to check. So lets see if we can narrow it down.