91 ranger OBD 1 code help

[ImpalaSlayer]

hey guys i need some help with obd 1 codes on my 91 range 2.3L manual trans. i recently did some maintenance work on the truck that includes:

oil and filter change
cleaned the maf
new air filter
new pcv valve
new fuel filter

now for the problem. when driving the truck and some times at idle, the truck will do something that feels like a "miss". the truck will jerk violently and once the clutch is pushed in the engine will sputter for a second and go back to a normal idle. the problem is very intermittent and will happen in any gear at any time. my dad and i went through the self test procedure listed in the haynes manual (which is pretty interesting) to pull the codes and got 4 of them. i should also mention ive been getting a CEL every now and then and it idled kinda rough which was the reason behind the maintenence. the plugs and wires were replaced not too long ago. the codes i pulled are:

14
18
32
41

the haynes manual is very vauge and i dont really understand any of the descriptions they give. i should also note this happened imidetly after i did the work on the truck. but i dont see how anyhting i did could cause what is happeneing unless i disturbed something else while i was in there.

thanks in advance
Dave

[justbob]

Dave, let me retype ALL the info that just ERASED after I hit post reply!

[Got_1]

Key On Engine Off (KOEO) = (O)
Key On Engine Running (KOER) = (R)
Continuous Memory = (C) also refered to as Keep Alive (KA) codes
these codes are displayed after the KOEO codes are displayed and followed by code 10 seperator.

you can check the codes using a test light, or analog volt meter.
read about that here:
http://www.fordfuelinjection.com/?p=13


11) system pass (O)(R)(C)

12) cannot control RPM during engine running self-test high RPM check (R)

13) cannot control RPM during engine running self-test low RPM check (R)

14) PIP circuit failure (C)

15) ECM read only memory test failed (O)
ECM keep alive memory test failed (C)

16) Igintion Diagnostic Monitor(IDM) signal not recieved (O)
RPM too low to perform HEGO test (R)

17) RPM below self-test limit with ISC off (R)

18) SPOUT circuit open or Spark Angle Word(SAW)circuit failure (R)
Loss of tach input/IDM circuit failure/SPOUT circuit grounded (C)

19) Failure to ECM internal voltage (O)
RPM erratic, dropped too low during test (R)
Cylinder Identification(CID) circuit failure (C)

21) ECT out of self-test range (O)(R)(C)

22) Map/Baro out of self-test range (O)(R)(C)

23) TPS out of self-test range (O)(R)(C)

24) ACT or VAT input out of self-test range (O)(R)

26) MAF or VAF input out of self-test range (O)(R)

28) Loss of primary tach(IDM) - right side (C)

29) insufficient input from VSS (C)

31) EVP or PFE circuit below minimum Voltage (O)(R)(C)

32) EGR valve not seated (R)(C)
EVP voltage below closed limit(SONIC)/EPT circuit voltage low (PFE) (O)(R)(C)

33) EGR valve opening not detected (R)(C)

34) Insufficient EGR flow/Excessive exhaust back pressure; or EVP voltage above closed limit(SONIC)/PFE sensor voltage high or out of range. (O)(R)(C)

35) EVP circuit below minimum voltage (O)(R)(C)

41) HEGO circuit indicates system lean (right HEGO) (R)
No HEGO switch detected - always lean (right HEGO) (C)

42) HEGO circuit indicates system rich (right HEGO) (R)
No HEGO switch detected - always rich (right HEGO) (C)

43) HEGO lean at wide open throttle (C)

44) Secondary air injection system inoperative - right side (R)

45) Secondary air injection upstream during self test (R)

46) Secondary air injection Not by-passed durning self test (R)

49) Spout signal defaulted to 10 degrees BTDC (C)

51) ECT sensor fault or open circuit (O)(C)

53) TPS circuit above maximum voltage (O)(C)

54) ACT sensor fault or circuit open (O)(C)

55) Key power input to ECM is open (R)

61) ECT sensor or circuit grounded (O)(C)

63) TPS circuit below minimum voltage (O)(C)

64) ACT sensor fault or circuit grounded (O)(C)

65) Never went to closed loop fuel (C)

67) NDS circuit open; A/C input high (O)(R)

70) EEC-IV data transmission (DCL) (C)

72) Insufficient MAP/BP output change during dynamic response test (R)

73) Insufficient throttle position change (O)
Insufficient TPS output change during dynamic response test (R)

74) Brake On/Off circuit failure - not actuated during test (R)

75) Brake On/Off cicuit closed - always high (R)

77) Brief WOT not sensed during Self-Test/Operator error (R)

79) A/C or Defrost on during Self-test (O)

84) EGR vacuum regulator (EVR) circuit failure (O)(R)

85) Adaptive fuel lean limit reached (C)
cannister purge circuit failure (O)(R)

86) Adaptive fuel rich limit reached (C)

87) Fuel pump primary circuit failure (O)(R)(C)

91) HEGO circuit indicates system lean (left HEGO) (R)
No HEGO switch detected (Left HEGO) (C)

92) HEGO circuit indicates system rich (left HEGO) (R)

94) Secondary air injection system inoperative (left side) (R)

95) Fuel pump secondary circuit failure (O)(C)

98) Hard fault is present - FMEM mode (R)

99) EEC system has not learned to control idle (R)

[justbob]

This is from my Actron scanner book:

14: The Electronic Control Assembly (ECA) has detected an intermittent loss of Profile pick-up (PIP) signal during recent operation.

18: Loss of TACH signal to Electronic Control Assembly (ECA). or
Distributorless Ignition System (DIS) fault - primary ciruit failure in coil 1,2,3, or 4. or
Electronic Distributorless Ignition System (EDIS) fault - failure in Spark Angle Word (SAW) circuit.

32: EGR Valve Position (EVP) sensor or pressure feedback EGR (PFE) sensor - signal voltage is below closed limit or has gone beyond set limits. or
Problems with EGR valve controlling.

41: Exhaust Gas Oxygen (EGO) sensor: voltage signal always "Lean" (low value) - does not switch.


First guess, without testing, is a bad EGR valve since they are a highly replaced item on all early Fords. Perhaps a bad coil pack also? Strickly guessing here.

[ImpalaSlayer]

thanks guys,

want 1, i too found a similar list but found it to be not very helpful


Bob, those descriptions seem much easier to understand. any idea how an egr would make the truck jerk violently like it is? i just find it very odd that this happens after i put 200 bucks into this dumb thing. i looked over the area good and didnt see any un hooked vaccumme lines or wires or anyhting.

[justbob]

If the EGR were to completely stick it would run very rough and eventually die. Very common. I can't explain why it is happening after you serviced it.

[Breadfan]

I'd pull the EGR and clean it and make sure the EGR passages appear clean. I don't know the 2.3l well, so I don't know how it's setup. Also look for cracks in any vacuum lines. If the EGR isn't responding quickly enough to open or close in certain times I could see that causing an intermittent issue.

Interesting is that the O2 reports lean as well, so bear that in mind - perhaps something is letting in unmetered air? (i.e. vauum leak?)

[ImpalaSlayer]

If the EGR were to completely stick it would run very rough and eventually die. Very common. I can't explain why it is happening after you serviced it.


i did some more research on "bad egr" and it appears this could very well be my problem. ill putt it off tomorrow and see what it looks like.

[ImpalaSlayer]

I'd pull the EGR and clean it and make sure the EGR passages appear clean. I don't know the 2.3l well, so I don't know how it's setup. Also look for cracks in any vacuum lines. If the EGR isn't responding quickly enough to open or close in certain times I could see that causing an intermittent issue.

Interesting is that the O2 reports lean as well, so bear that in mind - perhaps something is letting in unmetered air? (i.e. vauum leak?)

i will check all the vac lines again to make sure but i didnt see anyhting that looked to be problematic.

i have had an intermittent CEL for quite some time but the "jerking" just started after service. must just be an odd coincidence.

[ImpalaSlayer]

thanks to all, it ened up being the EGR posiiton sensor. put a new one in and its good to go!

[justbob]

Thats great news Dave.

[ImpalaSlayer]

Thats great news Dave.

i took a gamble and it paid off. after doing a little more research everyting was pointing to the egr. so i supplied vacuum to the egr its self and it seemed to work fine. i looked it up on line and saw you could buy each part seperate (the sensor is mounted to the egr) and the sensor was only $30 to the egrs $140 price tag. finnaly something worked in my favor.