1992 cadilaac Deville

Tiny
BLOONHEAD
  • MEMBER
  • 1992 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 134,000 MILES
My engine is sputtering at red lights at idle and when on the highway at a set speed you can see the speed odometer dropping and coming back up to speed ever so slightly and feel the car slowing and going again what would cause this.I have gotten error codes, e-30, e-31, e-53, e-91, e-98, and f-48 out of the self diagnostics system can that tell you anything.
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Wednesday, March 16th, 2011 AT 1:49 AM

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Tiny
FACTORYJACK
  • EXPERT
Is there a check engine light on? There could be some relevance with the codes, but which one is at fault? Was there any that continued in the check displaying e.E, that would indicate a current fault. In order, you have an ISC out of range(30), MAP signal shorted(31), Distributor signal interrupt(53), PRNDL switch problem(91-type B, only a service vehicle soon telltale), and High RPM P/N to D/R in ISC range(98-type C, no telltale). The F48 is a body control code for low refrigerant(A/C). The first three of the codes will illuminate the check engine light. With the surging, and idle problem, it could indicate a faulty throttle switch integral to the ISC motor. By sputtering idle, is it possibly lower than normal, and feeling as if it may stall? If the check engine light is on, I would recommend recording the codes, and then clearing them. You clear them by pressing either off and lo fan, or off and high fan(after codes have displayed and 7.0 is on the fuel data display). One situation will clear ECM codes, the other will clear body codes, and right now I am not sure which is which. The visual confirmation thatthe codes have been cleared will be either F0.0, or E0.0 appropriately. After clearing them, drive until the check engine light comes on, and that may indicate where your fault may lie.
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Wednesday, March 16th, 2011 AT 4:20 AM
Tiny
BLOONHEAD
  • MEMBER
Thank you so very much for taking the time and the information, I will give it a shot, its nice to know that there are nice people like you out there, thanks again
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Wednesday, March 16th, 2011 AT 3:51 PM

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