1990 F150 dies without warning
02-08-2018, 04:24 PM
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1990 F150 dies without warning
I am having an issue with my '90 4.9. It will die without warning, sometimes at idle. Sometimes I have to crank it a couple minutes then it will start and be fine. Fuel pump is 3 months old
I have replaced fuel filter, ignition stator and module,fuel pressure regulator. None of that helped. I scanned for codes, and found the following:
33-EGR valve fault/not closing properly
49- 1-2 shift error
87- primary fuel pump circuit failure
95-secondary fuel pump circuit fault
The 33, and 95 codes have been there since I started driving it last November. The 49,and 87 are new
What am I looking at here, replace fuel pump again?
I have replaced fuel filter, ignition stator and module,fuel pressure regulator. None of that helped. I scanned for codes, and found the following:
33-EGR valve fault/not closing properly
49- 1-2 shift error
87- primary fuel pump circuit failure
95-secondary fuel pump circuit fault
The 33, and 95 codes have been there since I started driving it last November. The 49,and 87 are new
What am I looking at here, replace fuel pump again?
02-08-2018, 05:18 PM
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02-08-2018, 05:27 PM
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Maybe
I would say replace the pump again. Wouldn’t be the first new part to fail. Also the EGR not closing properly can cause a huge problem. Had a 96 explorer would die out when it reached op temp due to bad valve. Replaced everything from filters to pump all kinds of sensors and lastley the egr valve. And it solved my prob.
02-08-2018, 05:54 PM
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I would say replace the pump again. Wouldn’t be the first new part to fail. Also the EGR not closing properly can cause a huge problem. Had a 96 explorer would die out when it reached op temp due to bad valve. Replaced everything from filters to pump all kinds of sensors and lastley the egr valve. And it solved my prob.
02-08-2018, 08:03 PM
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Before I replaced anything more I would do some testing. When it quits and before it will restart, I would check the fuel pressure with a gauge.
It could also be an ignition problem. I don't see where you replaced the coil?
It could also be an ignition problem. I don't see where you replaced the coil?
02-08-2018, 09:50 PM
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My bad, I replaced that yesterday, all ignition components are now new. I have no way to check fuel pressure when it quits, as I'm out doing deliveries (I run a newspaper motor route)
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02-08-2018, 10:17 PM
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This shows how:
(phone app link)
And I agree: stop throwing part$ at it, and diagnose the problem. If you can't, pay someone who can. It'll probably cost less & take less time. Do you have a Haynes manual & a digital multimeter (DMM)?
(phone app link)
(phone app link)
And I agree: stop throwing part$ at it, and diagnose the problem. If you can't, pay someone who can. It'll probably cost less & take less time. Do you have a Haynes manual & a digital multimeter (DMM)?
(phone app link)
02-08-2018, 11:01 PM
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This shows how:
(phone app link)
And I agree: stop throwing part$ at it, and diagnose the problem. If you can't, pay someone who can. It'll probably cost less & take less time. Do you have a Haynes manual & a digital multimeter (DMM)?
(phone app link)
(phone app link)
And I agree: stop throwing part$ at it, and diagnose the problem. If you can't, pay someone who can. It'll probably cost less & take less time. Do you have a Haynes manual & a digital multimeter (DMM)?
(phone app link)
02-09-2018, 12:00 PM
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Yes, that first photo shows how to check fuel pressure on the road.
I think Chilton's makes a good tire chock. For diagnosis, repair, & maintenance, invest in a Haynes.
I think Chilton's makes a good tire chock. For diagnosis, repair, & maintenance, invest in a Haynes.