No Power
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Junior User
Joined: Oct 2006
Posts: 57
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No Power
I own a 88 F-150 with a 5.0L engine with only 5,000 miles on it and a AOD transmission I recently install a 4:10 gear to help pull my RV. The toy hauler weighs 3950 and with my bike and junk in the trailer it weighs 4950. The only error I am geeting on the OBD-1 reader is a Thermactor system failure. I have replaced the relays,EGR valve, the air pump works so does the bypass valve. I need help wondering why I have no power at highway speeds and it pings also. I have changed the timing to 8 degrees and that helped a little on the knocking but still no power. I am wondering about the cats or adding a cold air induction system and pulleys but not until I find what is causing the power problem.
Senior User
Joined: Jul 2003
Posts: 491
Likes: 2
From: Spicewood, TX.
Of course when you had the EGR valve off you cleaned the manifold/tube/pipe passage, so thats not the problem..Usually I clean the passages first, since thats the problem anyhow, before throwing parts at it.
Did you troubleshoot the activation circuitry yet?
Did you troubleshoot the activation circuitry yet?
Senior User
Joined: Jul 2003
Posts: 491
Likes: 2
From: Spicewood, TX.
If and only if the actual EGR passages are clear, do you want to troubleshoot the activation circuitry. You want to check the differential back pressure sensor and all vacuum lines and temp sensor.
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