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.

 

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

 

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64 would be normal for a cold engine.
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?

 

not that i know of i think it all this started when i got ahold of some bad gass maybe i dont know,

ive replaced all the vac lines and it still idles real bad

 

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)?

 

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

 

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.

 

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

 

There are four main things that can cause this:
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

 

ok got the idle good but got some more codes here they are
57
47
87
got a good link to a code websight

 

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.

 

yea replaced the relay but still has a bad idle im going to check the compresstion then the timming chain next

 

hey egr valve was bad