lightflood Posted August 5, 2014 Report Share Posted August 5, 2014 Hello everyone. I have had this car since it was 3 years old or so. I drove it for the first 150k miles or so then I yanked the engine to do head/oilpan gaskets with norms inserts. I think I mostly did it for the challenge because once I was done I gave the car to my needy sister who now has her ran up to 205k miles. Anyway she has been complaining that the car has gotten very difficult to start sometimes but other times it starts immediately. I'm sure some of you guys have given a car away before to a relative, but not many of you probably give "lifetime warranty" like I do...funny how that works out isn't it? Also it stalls at high speeds sometimes. It seems to me that the idle speed motor is functioning correctly ( I replaced it once under my use of the car.). Just from hearing it run, it seems to misfire some on startup and almost sounds like a backfire sometime as it cranks. I think it has ignition control issues ie. crank sensors or ignition control module issues, but I default to the wiser people who can be found here. I did NOT do crank sensors while the engine was out......Anyway here is a list of the codes I pulled. I'm sure most are old and unrelated but all show "History" after the code: P012 P013 P017 P023 P030 P052 P053 P070 P083 P091 P095 P0109 It was a real joy to hear my old Caddy run even if not correctly. I have on hand a used ignition module with all the coil packs that I yanked from a boneyard years ago. I may as well start there I believe. I also have a pretty new looking EGR but that's not it I'm sure. Link to comment Share on other sites More sharing options...
lightflood Posted August 5, 2014 Author Report Share Posted August 5, 2014 To make it clear...It is a 93 STS northstar. Link to comment Share on other sites More sharing options...
lightflood Posted August 5, 2014 Author Report Share Posted August 5, 2014 Probably P012,P053, P083 together tell the story? Link to comment Share on other sites More sharing options...
Cadillac Jim Posted August 5, 2014 Report Share Posted August 5, 2014 P012 (E012) No Distributor SignalP013 (E013) Right Oxygen Sensor Not ReadyP017 (E017) Left Oxygen Sensor not readyP023 (E023) Electronic Spark Timing (EST) Signal problem [EGR]P030 (E030) ISC RPM out of rangeP052 (E052) PCM Memory ResetP053 (E053) Distributor Signal InterruptP070 (E070) Intermittent TPS SignalP083 (E083) Crankshaft to Ignition Module FailureP091 (E091) PRNDL Switch Problem (transaxle range switch problem)P095 (E095) Engine Stall DetectedP109 (E109) Keep Alive Memory (KAM) Reset/PCM has lost primary battery power If all the codes are HISTORY codes, you can reset the codes and see what comes back. P052 and P109 tell us that the battery was disconnected recently, so somebody may have done that, you just don't know how long ago because it can take three or four months for a HISTORY code to go away. The P012, P023, P053, and P083 all point to the crank sensors, the cam sensor, or the ignition module. Whoooa, P012 means that you have a 4.9, not a Northstar, although the 1993 STS should have the Northstar. Look at the wiring under the module in the distributor. If you *do* have the Northstar, look at the wiring to the ignition module and to the cam and crank sensors. Also, it looks like the heated oxygen sensors might need a fuse. The P070 and P091 codes also can be wiring problems. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
lightflood Posted August 6, 2014 Author Report Share Posted August 6, 2014 Thanks Jim, I as soon as I get a chance I intend to get this fixed. I am 100% sure this is a northstar engine. I will report back when I try something. Does anyone know how hard the crank and cam sensors are to get at? I'm sure I saw them but I don't recall where. Does this one have 2 crank sensors? Thanks guys! Link to comment Share on other sites More sharing options...
lightflood Posted August 6, 2014 Author Report Share Posted August 6, 2014 And are both crank sensors the same if it has two? Thanks again. Link to comment Share on other sites More sharing options...
KHE Posted August 6, 2014 Report Share Posted August 6, 2014 Two crankshaft sensors - you can see them above the oil filter adapter plate. I believe they're the same but the wiring is different color for the upper and lower sensor. There is one cam sensor - mounted in the rear head/chaincase area on the passenger side of the car. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Göran W Posted August 6, 2014 Report Share Posted August 6, 2014 The crank sensors are not the same. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted August 6, 2014 Report Share Posted August 6, 2014 The cam sensor is on the end of the cam cover on the rear head on the front (right side). The sensors rarely went bad on the 1993-1999 model years, so check the connectors and wiring before you replace any sensors. Someone with a 1993-199 FSM should look at the codes in their FSM to make sure that we are looking at the right places in the wiring. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
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