rough idle need help please
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Junior User
Joined: May 2006
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From: Alabama
rough idle need help please
hey guys Newbee here i have a 1990 ford f250 with a 351W
i let the truck sit for about 1 week and when i started it back up it would not stay running. ive replaced the plugs wire ext....
even the IAC MAP. also im looking on how can i retieve the OBD codes without the scanner any help would be great.
i let the truck sit for about 1 week and when i started it back up it would not stay running. ive replaced the plugs wire ext....
even the IAC MAP. also im looking on how can i retieve the OBD codes without the scanner any help would be great.
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Junior User
Joined: May 2006
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From: Alabama
hey i got the codes off the computer
here they are.
64 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded
53 Throttle Position sensor too high
34 EVP - (R) EGR did not respond properly during test EVR - (O, R, M) EVP sensor is/was high PFE - (O, R, M) PFE sensor is/was out of range
22 MAP (vacuum) or BARO signal out of range
any help would be great
64 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded
53 Throttle Position sensor too high
34 EVP - (R) EGR did not respond properly during test EVR - (O, R, M) EVP sensor is/was high PFE - (O, R, M) PFE sensor is/was out of range
22 MAP (vacuum) or BARO signal out of range
any help would be great
Last edited by grndlzrd; May 3, 2006 at 11:06 PM. Reason: new info
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
Originally Posted by grndlzrd
here they are.
64 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded
53 Throttle Position sensor too high
34 EVP - (R) EGR did not respond properly during test EVR - (O, R, M) EVP sensor is/was high PFE - (O, R, M) PFE sensor is/was out of range
22 MAP (vacuum) or BARO signal out of range
any help would be great
64 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded
53 Throttle Position sensor too high
34 EVP - (R) EGR did not respond properly during test EVR - (O, R, M) EVP sensor is/was high PFE - (O, R, M) PFE sensor is/was out of range
22 MAP (vacuum) or BARO signal out of range
any help would be great
34 & 22 sounds like a vacuum line off.
53 if over 5VDC then you would have a bad EEC.
Also all of the above may also come from an open SIG RTN (46).
Any small varmints been under the hood?
Junior User
Joined: Jan 2006
Posts: 59
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From: North Royalton, Ohio
When did you change your fuel filter last? You mentioned bad gas. I would say to check your fuel pressure.
Do you just have a bad idle, no idle(won't start), idle sergeing(rpms up and down)?
Do you just have a bad idle, no idle(won't start), idle sergeing(rpms up and down)?
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Junior User
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From: Alabama
just a bad idle run the truck till it completly ran out of gas changed fuel filter and still idles bad and sometimes stalls while idling runs fine when the eng. is good and warm
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Try reading the codes again when it is warm. Any of the codes above would cause this problem but codes are to be taken while the engine is warm and I had the impression that you took them with a cold engine.
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Originally Posted by grndlzrd
yea i reset the cpu and no codes showed up still idles bad rpms started to jump while at a idle stills stalls after a min or 2
1. Bad TPS.
2. Bad ECT Sensor. (The one with two wires on it)
3. Stuck open EGR valve.
4. Vacuum Leak.
Other items that can do it also are:
1. Bad IAT Sensor.
2. Bad Heated Oxygen Sensor
3. Bad MAP Sensor.
You will just have to go through the tests for each one until you get.
Go here to get some understanding of how test them.
http://fordfuelinjection.com/?p=10
Laughing Gas
Joined: Oct 2005
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From: The OC
57, Neutral Pressure Switch (NPS)-open circuit failure, or, circuit failed in Neutral position, or, octane adjust service pin installed.
47, Exhaust Gas Oxygen (EGO) sensor signal voltage indicates "rich" during "lean" air/fuel conditions, or, Vane Air Flow (VAF) sensor-voltage signal is too low. or, Transaxle problem-4X4L switch is closed.
87, Fuel Pump (FP) relay - circuit failure.
I would change the fuel pump relay first, $10 to $20 and that will probably fix your rough idling problem and may clear codes 47 and 87. As you change the relay, disconnect the ground cable on the battery to clear your codes.
47, Exhaust Gas Oxygen (EGO) sensor signal voltage indicates "rich" during "lean" air/fuel conditions, or, Vane Air Flow (VAF) sensor-voltage signal is too low. or, Transaxle problem-4X4L switch is closed.
87, Fuel Pump (FP) relay - circuit failure.
I would change the fuel pump relay first, $10 to $20 and that will probably fix your rough idling problem and may clear codes 47 and 87. As you change the relay, disconnect the ground cable on the battery to clear your codes.
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