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02-28-2004, 08:24 PM | #1 |
Registered Member
Join Date: Aug 2001
Location: Ft. Worth, TX
Posts: 456
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Engine Code Question
I have two mustangs I'm working on.
92 Coupe - I ran codes with an OTC 4000e monitor today. I did both KOEO and KOER. KOEO - Stored codes were 034 - EVP/PFE High 041 - No EGO switch 091 - No Ego switch When I cleared the codes and ran it again It didn't give me any codes and said system passed. KOER - 034 - EVP/PFE High 094 - Thermactor System 044 - Thermactor System The car does not have a smog pump. Has all bolt on's but stock heads and cam. Am I getting the 034 code because I'm not running the smog pump? I recently replaced the EGR valve and the IAC. The car runs good and is not giving me a check engine code. However, the car bucks (AOD) when I'm barely pressing on the gas. It does not buck when I'm giving more gas or at WOT. What would cause the car to buck? Could be the transmission? 89 Coupe Car won't idle and back fires when driving. When I swapped the IAC the symptons continued. I then swapped out the EGR valve and IAC still idled poor but quit back firing. When the engine warmed up the car ran smooth but does not feel like all the power is there. It smells rich too. I put on a new EGR valve and the car still won't idle and back fires. Could this be a fuel pressure regulator and or and 02 Sensor issue?
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02-29-2004, 11:36 AM | #2 |
Registered Member
Join Date: Feb 2003
Location: Oshkosh WI
Posts: 69
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89 Coupe
What kind of FPR is he running? If you pull off the vacum line and fuel comes out then you popped the diapragm inside and are sucking fuel through your vacum lines. O2 sensors can cause this issue if its one side or the other. If its both sides look to the mass air flow sensor. Brad
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93 GT 306 DSS, O-Ringed, AFR 185's, Pro Products Intakes, 55lb low imp inj, 80mm Pro-M meter, 2004 PMS, AFM Power Pipe, Kirban Reg, Vortech S-Trim 14lbs. No times yet. Trying to tune. |
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