evap problems
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evap problems
I have a 95 F150 302 4r70 4x4. Lately when I drive it for more than a half hour or so cel comes on and looses power. Then the cel will go out and it will regain power. It will continue this cycle till I park it and come back after the truck has cooled down. While it's running like this it will also idle rough and almost stall. I pulled codes and got 536 purge solenoid and 173 lean. So I replaced the purge solenoid, charcoal canister and all related vacuum lines. Ran it the next day and did the same thing. Pulled codes a second time and got 212 spout ground 172 and 173 rich and lean codes. I had the hood up and while running I could hear and feel the purge solenoid clicking rapidly with no defined pattern. It will continue to click with the key on engine off. The clicking won't stop until I turn off the key. I checked and wiggled every connection I could get to with no change to the clicking. A buddy told me to try replacing the temp sensor. I am at a loss as to what to try next. Any help would be great.
Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,750
From: Kentucky
Given the random symptoms and odd CANP activity I suggest to pull the computer out and inspect for signs of leaking capacitors. Very common problem these days.
Welcome to FTE!
Code 212 is frequently caused by installing the wrong Ignition Control Module (ICM). Your truck should have a black colored CCD ICM. Many part manuals are wrong so you end up with the gray Push-Start ICM.
Welcome to FTE!
Code 212 is frequently caused by installing the wrong Ignition Control Module (ICM). Your truck should have a black colored CCD ICM. Many part manuals are wrong so you end up with the gray Push-Start ICM.
Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,750
From: Kentucky
The hardest part is getting it out past the inner fender. I use a broom handle to bend that liner a bit so the computer clears. Obvious note: disconnect a batter cable before doing this.
As far as the ICM goes you will lose the CEL and the computer will once again control the ignition dwell as it was designed. Some find a slight increase in power and MPGs with the correct ICM installed. Be aware the aftermarket versions tend to have poor quality control. They frequently die sooner than later. Suggest a Ford/Motorcraft replacement and a good dose of heat sink compound. Do not confuse that with dielectric grease. Two completely products for different purposes.
As far as the ICM goes you will lose the CEL and the computer will once again control the ignition dwell as it was designed. Some find a slight increase in power and MPGs with the correct ICM installed. Be aware the aftermarket versions tend to have poor quality control. They frequently die sooner than later. Suggest a Ford/Motorcraft replacement and a good dose of heat sink compound. Do not confuse that with dielectric grease. Two completely products for different purposes.
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