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SN95 Cobras
Troublesome Trouble Codes... P0171
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<blockquote data-quote="aaron97" data-source="post: 6184503" data-attributes="member: 66010"><p>Well, the P0174 is back now. We put a new FPR, MAF and fuel filter. The pressure is 6psi low with the Vac' connected and 8 psi low with it disconnected. Was talking with an ASE guy I know, and he thinks that the IMRC bearings leaking may not be enough to trip the codes this consistently. The codes only pop at idle still, only twice out of the 30ish freeze frame data's that I looked at showed it tripping at about 2500 RPM. So next up I am going to change the fuel pump, which is also a good time for a 255lph upgrade. We found tons of places online to get sealed bearings, so if the pump dont fix the CEL's, we’ll just have to take the intake apart again to mic the inside and outside diameters of the bearings. Even if the pump fixes the codes I would still do the bearings or delete down the road shortly.</p><p></p><p>Here is the parts list so far...</p><p>Forward O2 sensors</p><p>Intake Manifold gasket set</p><p>Intake manifold & IMRC cleaned (looks like new on the inside)</p><p>IMRC cable replaced (driver side)</p><p>IMRC o-rings replaced (both sides)</p><p>New MAF</p><p>New Canister purge valve</p><p>Cleaned IAC (was gummed up and making humming noise)</p><p>Cleaned Injectors</p><p>FPR</p><p>Filter</p><p></p><p>Next up are....</p><p>Fuel pump</p><p>IMRC bearings</p><p></p><p>I was trying not to just throw money at this problem but that's just the way its ending up... Been about 3 weeks since we started trying to fix the issue.</p></blockquote><p></p>
[QUOTE="aaron97, post: 6184503, member: 66010"] Well, the P0174 is back now. We put a new FPR, MAF and fuel filter. The pressure is 6psi low with the Vac' connected and 8 psi low with it disconnected. Was talking with an ASE guy I know, and he thinks that the IMRC bearings leaking may not be enough to trip the codes this consistently. The codes only pop at idle still, only twice out of the 30ish freeze frame data's that I looked at showed it tripping at about 2500 RPM. So next up I am going to change the fuel pump, which is also a good time for a 255lph upgrade. We found tons of places online to get sealed bearings, so if the pump dont fix the CEL's, we’ll just have to take the intake apart again to mic the inside and outside diameters of the bearings. Even if the pump fixes the codes I would still do the bearings or delete down the road shortly. Here is the parts list so far... Forward O2 sensors Intake Manifold gasket set Intake manifold & IMRC cleaned (looks like new on the inside) IMRC cable replaced (driver side) IMRC o-rings replaced (both sides) New MAF New Canister purge valve Cleaned IAC (was gummed up and making humming noise) Cleaned Injectors FPR Filter Next up are.... Fuel pump IMRC bearings I was trying not to just throw money at this problem but that's just the way its ending up... Been about 3 weeks since we started trying to fix the issue. [/QUOTE]
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Troublesome Trouble Codes... P0171
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