FPR Vacuum
01-25-2012, 02:49 PM
#1
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Year: 1987
Model: Wagoneer
Engine: 4.0
FPR Vacuum
Still running way rich.
The vacuum on my 87 waggy 4.0 is pulling strong at the fpr. When I remove the vacuum, there is no change in idle. Does this mean the fpr is bad? Is there a way to test the fpr?
The vacuum on my 87 waggy 4.0 is pulling strong at the fpr. When I remove the vacuum, there is no change in idle. Does this mean the fpr is bad? Is there a way to test the fpr?
01-25-2012, 03:00 PM
#2
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Year: 1990
Model: Cherokee
Engine: 4.0
The best thing would to do is get a fuel pressure test gauge on it to see what pressures are and do the test. I don't recall the specs its suppose to be exact at, but when its running and you pulling the vacuum line off the pressure should go up about 10psi. You sure you don't have any vacuum leaks? Another thing when you pull the vacuum line of the regulator does any fuel come out of the regulator or the line itself
01-25-2012, 03:06 PM
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Year: 1987
Model: Wagoneer
Engine: 4.0
No fuel is present when the engine is running and I pull the vacuum hose.
I do not think there are any vacuum leaks. When I put my hand over the throttle the engine dies.
The Jeep has no trouble starting or idling, but backfires like crazy if you add any pressure on the accelerator.
Checked, and or replaced everything I can think of besides the fpr. TPS (new and adjusted), MAP, IAC, EGR, grounds, O2, rotor, plugs, wires, and cap are all good or new.
I do not think there are any vacuum leaks. When I put my hand over the throttle the engine dies.
The Jeep has no trouble starting or idling, but backfires like crazy if you add any pressure on the accelerator.
Checked, and or replaced everything I can think of besides the fpr. TPS (new and adjusted), MAP, IAC, EGR, grounds, O2, rotor, plugs, wires, and cap are all good or new.
01-25-2012, 05:00 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Do the fuel pressure test.
01-28-2012, 02:39 PM
#7
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Year: 1987
Model: Wagoneer
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AutoZone has the pressure tester for $45.00. They rent it for $150.00 plus deposit.
Is it better to just buy a new FPR for $54.00?
Is it better to just buy a new FPR for $54.00?
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01-28-2012, 03:23 PM
#8
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Year: 1990
Model: Cherokee (XJ)
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