S type fuel pressure
Joined: Mar 2012
Posts: 4,759
Likes: 1,435
From: Hazlet Township, NJ
Over 40 psi at idle and yes. When was the fuel filter changed out last?
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Junior Member
Joined: May 2012
Posts: 3
Likes: 0
From: powell,tn
It has a new fuel pump and filter. It runs perfect and idles perfect but sometimes it will just die at idle and then restart. I also put a new crankshaft sensor on. Where is the fuel regulator located and what does it look like. This is a 6 cylinder.
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Joined: Jan 2025
Posts: 5
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From: British Columbia
Fuel pressure doesn't change during acceleration
I was checking mine as I was getting a lean code and my Fuel Pressure was at 378 kPa at Idle and barely changed with acceleration Manifold pressure was 39kPa, both LT Fuel trims are high at Idle 14% and 17% at idle and then drop quickly with acceleration.
Changed the air filter and MAF was ok for about a week before light came back on.
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Joined: Jan 2025
Posts: 5
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From: British Columbia
P0171 and occasionally I get a p0174 but its rare, usually just the P0171
The air filter was terrible and seemed like it hadn't been replaced but it was supposed to have been, I cleaned the MAF and it at first seemed to help but then stopped so I replaced it with a Walker. Then had both codes and saw the MAF was loose so I tightened it and it seemed to be fine for a week or so
The air filter was terrible and seemed like it hadn't been replaced but it was supposed to have been, I cleaned the MAF and it at first seemed to help but then stopped so I replaced it with a Walker. Then had both codes and saw the MAF was loose so I tightened it and it seemed to be fine for a week or so
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Junior Member
Joined: Jan 2025
Posts: 5
Likes: 0
From: British Columbia
P0171 and occasionally I get a p0174 but its rare, usually just the P0171
The air filter was terrible and seemed like it hadn't been replaced but it was supposed to have been, I cleaned the MAF and it at first seemed to help but then stopped so I replaced it with a Walker. Then had both codes and saw the MAF was loose so I tightened it and it seemed to be fine for a week or so
The air filter was terrible and seemed like it hadn't been replaced but it was supposed to have been, I cleaned the MAF and it at first seemed to help but then stopped so I replaced it with a Walker. Then had both codes and saw the MAF was loose so I tightened it and it seemed to be fine for a week or so
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