Iac?
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Iac?
Engine blew head gasket on interstate and severe overheating. Rebuilt top motor. New problem arises. Engine surging. Code #83 key on, engine off. Code #34, #44 #25 #77 engine running. Tested EGR: perfect 5.0. Tested EVR. Doesn't even register 0.00 (should be 5,000 according to specs with setting on Ohms). However, all over-the-phone mechanical advice (hundreds went into towing, engine rebuild, troubleshooting, etc. plus American steel construction market took radical drop [China 
] so have to figure out on own with cheap code reader) points to IAC which has been cleaned twice. One mechanic says IAC has plastic internal which may have melted during overheat. Work finally on Monday any advice GREATLY appreciated!
] so have to figure out on own with cheap code reader) points to IAC which has been cleaned twice. One mechanic says IAC has plastic internal which may have melted during overheat. Work finally on Monday any advice GREATLY appreciated!
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
None of those codes points to the IAC, how did you get there?
34 points to the EVP, you need to test that it moves freely and that the resistance measurement sweeps smoothly from closed to open. It also has to produce the correct voltage when closed, you can only measure this with it connected and by probing the wires with a sharp pin.
83 points to the EVR, if this tests bad replace it.
44 is related to the thermactor system. This is vacuum controlled by the 2 solenoids near the coil right next to the EVR. A broken or melted vacuum line could be causing both these last 2 codes and causing the surging idle.
Codes 25 and 77 are user error during self test, ignore these.
This site is your friend... Ford Fuel Injection
34 points to the EVP, you need to test that it moves freely and that the resistance measurement sweeps smoothly from closed to open. It also has to produce the correct voltage when closed, you can only measure this with it connected and by probing the wires with a sharp pin.
83 points to the EVR, if this tests bad replace it.
44 is related to the thermactor system. This is vacuum controlled by the 2 solenoids near the coil right next to the EVR. A broken or melted vacuum line could be causing both these last 2 codes and causing the surging idle.
Codes 25 and 77 are user error during self test, ignore these.
This site is your friend... Ford Fuel Injection
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Wow!
Something good finally happened after inspecting vacuum lines! Surge disappeared. All codes disappeared during both tests. However, code reader which is absolutely working because it DID run diagnositics has NO lights whatsoever after both tests. Shouldn't it give me an #11 or some code saying it is working? EVP testing low at 3600-3800 ohms range.
