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Re: 4.9 1988 F150 Trouble codes ?
32 is EVP voltage above closed limit- perform EGR valve, EVP sensor and EVP circuit checks.
51 is sensor signal above maxium limit. ECT {possible open}
41 {r} indicates lean.Actually they all have to do with your EFI fuel delivery system. Start with your EGR valve, and also include your Idle air control valve. {I see you did that} . Good luck, couldnt find the rest of your codes. Sorry.
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