Quick question.
06-01-2011, 03:23 PM
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Car: '86 SC
Engine: 2.8
Transmission: 700r4
Axle/Gears: 3.42
Quick question.
The vacum line that goes in to the FPR, what exactly does it do?
The reason I ask is my 86 2.8 MPFI runs better with it plugged than it does when it is hooked up. The car is more steady without it, before i plugged it, the car would rumble and idle well and drive ok, and then it would suddenly get quiet and sound like it still has the muffler on it and have no power, and when you put some throttle to it, it would pop and miss and not have any power.
Now it sounds better, runs better and has more power.
It has a TPI fuel pump and an Adjustable FPR. Thanks
The reason I ask is my 86 2.8 MPFI runs better with it plugged than it does when it is hooked up. The car is more steady without it, before i plugged it, the car would rumble and idle well and drive ok, and then it would suddenly get quiet and sound like it still has the muffler on it and have no power, and when you put some throttle to it, it would pop and miss and not have any power.
Now it sounds better, runs better and has more power.
It has a TPI fuel pump and an Adjustable FPR. Thanks
06-01-2011, 05:45 PM
#2
Re: Quick question.
The vacuum provided by the FPR vacuum hose adjusts the fuel pressure in relation to engine load. Higher vaccum, like at idle or low throttle cruise reduces the rail fuel pressure, to maintain a delta fuel pressure of approximately 39 PSIG. The importance of maintaining this delta pressure is to have predictable fueling supply.
It sounds like your base fuel pressure may not be adjusted correctly.
It sounds like your base fuel pressure may not be adjusted correctly.
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