scott y Posted April 10, 2012 Author Report Share Posted April 10, 2012 This morning I had a little time so I hooked up my spark tester similar to Mike's link image and there is no spark, and NO codes. I was kind of leaning towards the ICM but how can I determine what is actually wrong with no codes to follow up with You'd really think that in a positive no spark/no code condition that SOME kind of code would set! Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 10, 2012 Report Share Posted April 10, 2012 Check the power lead to the ICM to make sure its connected and not corroded. Check Fuses, check for power at the ICM with a volt meter and check grounds Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
scott y Posted April 10, 2012 Author Report Share Posted April 10, 2012 Would you happen to have a schematic for that Mike? The ICM itself is grounded when the 4 bolts to the cam cover are attached,the fuses all are clean and free of corrosion and none are blown. Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 10, 2012 Report Share Posted April 10, 2012 Yes, but the cam cover is magnesium I think, there is a separate ground wire on the ICM if I recall. You will find a plug that faces inboard, pull the plug and test for power with your volt meter, the WIRE should be a clue, it will probably be red and heavier gage. I don't have a schematic handy Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
scott y Posted April 10, 2012 Author Report Share Posted April 10, 2012 You're right there is another wire(black) which grounds the ICM,it seems to be doing its job.I found a red one and its about 16-18ga. with proper battery voltage,black is ground and a lite green possibly yellow for the tach. Triple checked for spark still nothing, apparently I should be setting a P012 code-no distributor signal. This according to my Chiltons manual which is all I really have to go on at this point Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 10, 2012 Report Share Posted April 10, 2012 So you are not setting any codes at all? If you could swap in a known good ICM, that would be telling Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
scott y Posted April 11, 2012 Author Report Share Posted April 11, 2012 Today I found a used ICM, I took the coils off and cleaned up all the connections installed and it fired right up! It slowly began to run a little rough so I pulled the codes and a pesky p083 was set(distributor to crankshaft failed). This seems to keep going on and on,bad used ICM? bad CKP's? Where to spent my time and money next? Link to comment Share on other sites More sharing options...
Ranger Posted April 11, 2012 Report Share Posted April 11, 2012 Maybe this will help you with the ICM wiring. Link to comment Share on other sites More sharing options...
scott y Posted April 11, 2012 Author Report Share Posted April 11, 2012 Thanks Ranger I have that exact same diagram. I guess that there is no other way to figure out this issue than to replace parts again (buy this, try that)....found this on the other site that seems mighty familiar to my woes http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/64376-1994-eldorado-p083-code.html Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 11, 2012 Report Share Posted April 11, 2012 Looks to me like your replacement ICM could be bad after reading that. Keep in mind that you got the code after a few minutes. You are getting there Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
KHE Posted April 11, 2012 Report Share Posted April 11, 2012 The code P083 (distributor to crankshaft) would seem to point at the camshaft position sensor since the car does not have a distributor. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
scott y Posted April 11, 2012 Author Report Share Posted April 11, 2012 Yes, I agree about the ICM Mike, I got ballsy this morning and took it out for some punishment(WOT)runs and even tho that p083 is still current it performs like the champ it always was. Idles nice and smooth, shifts great,fires right up time after time. I found another boneyard about 20 mins away that has 2 97 STS and 1 96 STS,I'm gonna go out and have a gander at the goods. Got my fingers crossed. Thanks for your patient responses Mike! Link to comment Share on other sites More sharing options...
scott y Posted April 11, 2012 Author Report Share Posted April 11, 2012 The code P083 (distributor to crankshaft) would seem to point at the camshaft position sensor since the car does not have a distributor. You could very well be right KHE however,don't these old OBD1 codes kind of reflect back to the cars with a distributor? And the reference to the dist. could be the ICM,just wondering... Link to comment Share on other sites More sharing options...
KHE Posted April 11, 2012 Report Share Posted April 11, 2012 You could very well be right KHE however,don't these old OBD1 codes kind of reflect back to the cars with a distributor? And the reference to the dist. could be the ICM,just wondering... The reason I think it may be the camshaft position sensor is that on the old 4.9 and 4.5 engines, the cam sensor was mounted on the distributor assembly. It makes sense since the distributor on those engines was driven off the camshaft. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
scott y Posted April 11, 2012 Author Report Share Posted April 11, 2012 Problem Solved!!!! Just installed my"new" 97 ICM, no more code p083 YAY! Strange that it ran out to the yard(roughly 1 hr round trip) without even so much as a hiccup. Swapped the coilpacks to the ICM fired up. Another thing is my p071(intermittent map signal) which was always history has also dissappeared. Happy Days after all that cryin and whinin I was doing. Thanks guys for all of your very helpful directives, I've definetly learned something from all of this Link to comment Share on other sites More sharing options...
Texas Jim Posted April 11, 2012 Report Share Posted April 11, 2012 Hey Scott, Glad you got it all fixed up... Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 11, 2012 Report Share Posted April 11, 2012 Way to go Scott! Glad to be part of the solution here at Caddyinfo. We also learn, so thanks Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
scott y Posted April 18, 2012 Author Report Share Posted April 18, 2012 Well, Folks it's been a week now since I've done my tweakin to the Ol 94 STS and may I just say it's been awesome! This car runs and drives like new! It sounds sooo nice as I perform the WOT treatments to er. Took er out on the freeway a few times and it's heaven to drive...Thanks again! I'm gonna tryin get a video in this week if I can. Also I think it deserves some fresh rubber, Goodyear Eagle GT's 225 55/16 v rated of course. http://www.1010tires.com/About/Goodyear/Eagle+GT Link to comment Share on other sites More sharing options...
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