hard miss when driving
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From: La Grande, OR
hard miss when driving
Ok, this started by chasing an idle problem. Had checked and tested TPS, its good. Cleaned and tested IAC, its good. New EGR valve. Cleaned out whole throttle body, and made it look a little prettier too 
. All vacuum lines are new and good.
Now the idle is fixed, but now driving down the road cruising at a constant speed (any) where the throttle is at the same position, the engine starts cutting in and out, sputtering like its out of gas for a second. Is this something wrong with the TPS?
It didnt do it before I did all of this stuff.
. All vacuum lines are new and good. Now the idle is fixed, but now driving down the road cruising at a constant speed (any) where the throttle is at the same position, the engine starts cutting in and out, sputtering like its out of gas for a second. Is this something wrong with the TPS?
It didnt do it before I did all of this stuff.
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From: La Grande, OR
Ok, pulled codes, got a
Code 85 -- Canister purge circuit failure...which is to be expected because this truck used to be a 5.0, and doesnt have a canister purge solenoid, so the computer thinks it needs it.
Code 95 -- Fuel pump secondary circuit (am dash) failure....PCM to ground.
Does that mean that my PCM is shorting out?? Or a ground wire happened to fall off somewhere? Where should I check?
Code 85 -- Canister purge circuit failure...which is to be expected because this truck used to be a 5.0, and doesnt have a canister purge solenoid, so the computer thinks it needs it.
Code 95 -- Fuel pump secondary circuit (am dash) failure....PCM to ground.
Does that mean that my PCM is shorting out?? Or a ground wire happened to fall off somewhere? Where should I check?
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Joined: Jun 2004
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From: Florida
By what you said I am assuming you swapped the motor for a 351W? Not sure if thats a direct swap but doubt thats the problem.
95 Fuel pump secondary circuit failure. The EEC senses infinite resistance to ground from the fuel pump on the Fuel Pump Monitor circuit.
Got this from www.fordfuelinjection.com. Possible that your fuel pump is going, or you have a faulty wire to the fuel pump. Does it have duel tanks?
95 Fuel pump secondary circuit failure. The EEC senses infinite resistance to ground from the fuel pump on the Fuel Pump Monitor circuit.
Got this from www.fordfuelinjection.com. Possible that your fuel pump is going, or you have a faulty wire to the fuel pump. Does it have duel tanks?
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From: La Grande, OR
yeah, but the high pressure pump is on the framerail....will take it loose and see if one of the wires came loose or not.
Yes I did swap it for a 351W, and yes it is a direct swap, except to get the best results, you need the 351W EEC.
I just replaced that high pressure pump this October (ran it out over summer and burned it up) so I really hope that it's not going again.
Yes I did swap it for a 351W, and yes it is a direct swap, except to get the best results, you need the 351W EEC.
I just replaced that high pressure pump this October (ran it out over summer and burned it up) so I really hope that it's not going again.
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From: Florida
I would start there. I would also check your fuel pressure as well if you haven't already. Also, check your grounds to the pcm, as there are many who have run into this problem including myself. There is a small black wire coming off the neg battery cable that goes to the pcm. Mine was torn up behind the radiator.
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Joined: Dec 2005
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From: Newbern, Tn
I to am having the same problem. would the pcm wire cause the motor to stumble,almost like the fuel was being cut off. My problem started all of a sudden.
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From: La Grande, OR
Checked the wires on the pump, they were tight, took them off and scratched em up a bit, then put em back on just in case, but it still does it.
ok, I have 2 small black wires from the neg. cable, I will check them and see if they're broken.
Mine started all-of-the-sudden too, coincidentally right after I took off the throttle body, cleaned everything there, and put it back on, so I thought that it might have been something there.
Another thing about this, it doesnt do it at the same point anywhere, its pretty random, and it just cuts in and out for a second.
ok, I have 2 small black wires from the neg. cable, I will check them and see if they're broken.
Mine started all-of-the-sudden too, coincidentally right after I took off the throttle body, cleaned everything there, and put it back on, so I thought that it might have been something there.
Another thing about this, it doesnt do it at the same point anywhere, its pretty random, and it just cuts in and out for a second.
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From: Central NY
fuel pump relay would be my first guess.
Please start a new thread to discuss your truck in the future. Sorry to nit-pick but somepople might miss your posting becuase they don't want to get involved with this one.
Please start a new thread to discuss your truck in the future. Sorry to nit-pick but somepople might miss your posting becuase they don't want to get involved with this one.
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From: La Grande, OR
I did re-route my plug wires, and yeah some are touching. I will re do those in the morning and make sure that they are touching as little as possible, but would that still throw a code 95? Not sure what you mean about the new thread thing, I just put down what it felt like was happening to better explain it.
My pump works, runs for the 2-3 seconds when the key is on and shuts off, just like its supposed to.
My pump works, runs for the 2-3 seconds when the key is on and shuts off, just like its supposed to.
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From: La Grande, OR
lol, yeah, we've all been known to hijack a thread or two to get some extra info.
Would the wire problem still throw a Code 95 you think? Also, just so that I can check to see if the wires are bad somewhere, where is the FP relay?
Would the wire problem still throw a Code 95 you think? Also, just so that I can check to see if the wires are bad somewhere, where is the FP relay?
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From: Central NY
For the code 95 I would clean all the grounds, there are several. Mine has a body ground just by the battery, a frame ground right from the battery, a block ground, an exhaust ground, a pcm ground... not sure how it is in the 87's. Which year did your 5.8 come out of?