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Old 03-28-2009, 01:24   #1 (permalink)
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code problems

I`ve been working on my 89 F150 for a while now and run into a problem with some codes. first code is EGR valve 33 no flow ; second code tps pedal postion min voltage code 63 ; third EVP sensor code 31 below min voltage. can some one tell me what is going on with this. I`ve rebuilt the motor and put all new sensor on the motor and i do mean all new. It`s got me to the point to where i dont know what to do. It`s a 302 ho out of a mustang thats borded 40 over with a 270 com cam; roller lifters.the motor has been completely rebuilt with all new parts. what do i need to do? thanks Mike
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Old 05-02-2009, 14:45   #2 (permalink)
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Re: code problems

An '89 doesn't actually have a sensor for EGR flow, so code 33 really means the EVP or EVR circuits are showing a fault. Haynes shows exactly how to test them, and the TPS using a cheap multimeter. Older TPSs were adjustable, but before attempting that, you should make sure the throttle stop screw has NOT been. Read the links I posted in this thread:
setting the idle on a 92 bronco
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