1997 F-250 7.5L Help - Codes 173, 332 - Rough Idle - Ford Truck Enthusiasts Forums



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1997 F-250 7.5L Help - Codes 173, 332 - Rough Idle

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Old 11-29-2010, 03:08 PM
boaterdude83 boaterdude83 is offline
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1997 F-250 7.5L Help - Codes 173, 332 - Rough Idle

We have a 97 F250 with the 7.5L V8. The truck is pulling codes 173 - EGO Not switching, Rich Exhaust Bank 1 and 332 - EGR Valve Not opening.

The truck Idles very rough, and blows black smoke when reved from an idle. It runs smooth at higher rpms though, and seems to have its power. We do have alot of miles on the truck, but until this problem, she ran great. Any help would be much appreciated! I'm trying to get her running well for the winter. Thanks guys!
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Old 11-29-2010, 04:27 PM
Lazy K Lazy K is offline
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I think I would check the Fuel Pressure Regulator. Make sure that the vacuum pipe going to it is good and then pull the vacuum pipe off the FPR and look for signs of gas in it. If any found replace the FPR.
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Old 11-29-2010, 05:49 PM
danr1 danr1 is offline
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X2 on the possible leaking regulator and if that doesn't look to be the problem then check fuel pressure.

Make sure its not to high, should be,

Engine off key on = 35 to 45psi.

Engine running, FPR vac line attached = 30 to 45 psi.

Engine running, FPR vac line disconnected = 5 to 10 psi increase.

Static pressure leakage check,

Verify that the fuel pressure remains within 5psi of spec for 1 minute after turning engine off.
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Old 11-30-2010, 03:55 PM
boaterdude83 boaterdude83 is offline
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Engine off key on - Shoots up to about 55 psi, and slowly drops down 20 and below. Engine running 70 - 74 psi (bouncing around). Turn engine off drops right back down to next to nothing. Sound like I need a FPR? Also - On the vac lines there is a small cylinder with 2 vac lines on the top of it and a plug with 2 leads in on. Any idea what this is? Thanks for your help guys!
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Old 12-01-2010, 04:14 PM
boaterdude83 boaterdude83 is offline
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Put the new regulator on, and It runs so much better. Runs at 30 psi, and holds pressure after being shut down. I was amazed at how much better it ran with the new regulator. Still have the codes, so I'll be clearing them, and I'll be pulling it out tomorrow to run it and see what codes I get. Again though, If anyone has any idea what that vacuum valve is, let me know! I'm very interested to find out what it does. Thanks again!
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Old 12-01-2010, 04:27 PM
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A picture would help but it sounds like the CANP solenoid. It allows fuel vapors from the fuel tanks/charcoal canister to be sucked into the engine.
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Old 12-01-2010, 04:47 PM
Lazy K Lazy K is offline
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What rla says, the canister purge solenoid.
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