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Sent to Car Experts June 15 02:35 PM

I have a 1992 cadillac fleetwood with a 4.9 engine and it starts and shuts right off. I checked the engine codes and it has code E31 and E74 I changed the MAT senser and the car is doing the same thing. It starts and shuts right off. Can you help me. Thank you

Customer (name blocked for privacy)
Status:  Closed   Value: $10
Answer
June 15 2:40 PM (5 minutes and 47 seconds later)
         
REPLIEDCheck Mark

E31 Shorted MAP Sensor Signal

E74 Intermittent MAT Sensor Signal

It sounds like you have some wiring problems. You going to have to start testing the circuits between the computer and sensors to locate the problem. You have a short somewhere



Edited by Tech501 on June 15 2005 at 2:41 PM
Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 16 3:49 PM (1 day and 1 hour later)
         
Reply to Tech501's Post: I had a guy check the wiring and that is not the problem. Sometimes i hold my foot to the floor and i can get it to run but it dosen't run that good.
Customer (name blocked for privacy)
Answer
June 16 6:48 PM (2 hours and 59 minutes and 15 seconds later)
         
REPLIEDCheck Mark
If your "guy" was smart enough to check the wiring, why can't he tell you what's wrong with the circuit. If the circuit is tested properly, there will be a diagnosis and resolution. The PCM is receiving a shorted signal. Someone who knows how to trace the circuit needs to find out where it is.

Edited by Tech501 on June 16 2005 at 6:48 PM
Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 16 7:17 PM (28 minutes and 34 seconds later)
         
Reply to Tech501's Post: I let the car sit overnight and when i got out of work i tryed to start the car and it ran for about two or three minutes then it shut off again. Now it is starting and shutting right off again. The only code it has now is code E32.
Customer (name blocked for privacy)
Answer
June 16 7:20 PM (3 minutes and 38 seconds later)
         
ACCEPTEDCheck Mark
I told you what needs to be done. I can't tell you what's wrong with your car without testing these circuits. I've answered your question and told you how to resolve it. That's as far as I can go. Please click on the accept button.
Tech501 -- Auto Service Technician -- 96% Positive Feedback on 740 Car Accepts
38 years exp, ASE Mastertech with L1 Advanced Engine performance
Reply
June 16 8:09 PM (48 minutes and 19 seconds later)
         
Reply to Tech501's Post: Hi, I found it. It has a bad wire at the map sensor. Problem fixed. I will send you the money and thanks alot.
Customer (name blocked for privacy)
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