DADCAD Posted October 28, 2005 Report Share Posted October 28, 2005 Two days in a row, sitting at a stop light. "Stop Engine" "Low Oil Pressure" Warning...Checked oil level(I do have a leak) Level was o.k...First thought was the strainer clogged, second was bad filter...Third? are there any relief valve's,bypass valves, etc on the on the 4.9? This only happen's at idle in traffic...Stop light, etc. No noticable difference in engine noise, knocks, ping's and such...pulling code's in the morning. I will get back with those...Thanks for any help...Pete Link to comment Share on other sites More sharing options...
adallak Posted October 28, 2005 Report Share Posted October 28, 2005 Some sensors, connectors, ECM, etc. may malfunction when engine is really hot (some 220 plus). For example, my ABS light turns on when I have to stop for a while. I disconnected and reconnected the related connector - did not help. I would not worry much. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Ranger Posted October 28, 2005 Report Share Posted October 28, 2005 This has been discussd before. Do a search for oil pressure or low oil pressure. I think one cure was to try 15w40 oil. Link to comment Share on other sites More sharing options...
WarrenJ Posted October 28, 2005 Report Share Posted October 28, 2005 I would not worry much. Well, I would worry. And A LOT! After all, you might actually have low oil pressure! Bad wiring, sensors, etc. do not normally express themselves only at idle. Resolve this problem before going any further. Of course, you'd want first to check the oil pressure sending unit as well as the "Oil Level" switch. Let's not forget that "Low Oil Level" is VERY different than "Low Oil Pressure." This has been discussd before. Do a search for oil pressure or low oil pressure. I think one cure was to try 15w40 oil. Ranger, isn't that a workaround rather than a solution? Regards, Warren P.S. When my "Oil Level" switch (on the oil filter adapter plate) was defective, I got the same "Stop Engine Now . . . . Low Oil Pressure" warning. Of course, that's a 4.6L kinda thing. There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises Link to comment Share on other sites More sharing options...
Ranger Posted October 28, 2005 Report Share Posted October 28, 2005 This has been discussd before. Do a search for oil pressure or low oil pressure. I think one cure was to try 15w40 oil. Ranger, isn't that a workaround rather than a solution? Regards, Warren I suppose I should have first said, check the oil pressure switch but, from past expirience it seems that most cases there was nothing wrong and a heavier oil was all that was needed. Especially since it is only at idle. If infact the pump where bad I suspect the engne would be toast by now and making all sorts of racket. Link to comment Share on other sites More sharing options...
Scotty Posted October 28, 2005 Report Share Posted October 28, 2005 DADCAD, what kind of oil are you using, brand, viscosity, synthetic? Link to comment Share on other sites More sharing options...
adallak Posted October 28, 2005 Report Share Posted October 28, 2005 Bad wiring, sensors, etc. do not normally express themselves only at idle. This is not about just idle... sitting in traffic and idle in the morning are different in terms of the temperatures in the engine compartment.... ECM gets hot too since the heater core is in close proximity. Why should the oil pump act differently when engine is hot? Oil viscosity? The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
bobnsue2 Posted October 28, 2005 Report Share Posted October 28, 2005 The oil pump may not act differently, but the oil is thinner when hot. You ought to get a real gauge installed even if just under the hood to see for yourself what the pressure is. Bob B Link to comment Share on other sites More sharing options...
Scotty Posted October 28, 2005 Report Share Posted October 28, 2005 Good suggestion Bob. That is what I was thinking. That is the reason I was trying to find out what type of oil was being used. The only solution is to actually see what the rear oil pressure is. We had an 86 corvette that the oil light would come on at idle when the engine was very hot (traffic, etc). We sold it because I thought that the main and rod bearings had worn and the engine needed an overhaul plus I didnt want to deal with it. Link to comment Share on other sites More sharing options...
DADCAD Posted October 28, 2005 Author Report Share Posted October 28, 2005 DADCAD, what kind of oil are you using, brand, viscosity, synthetic? Running Quaker 10-30...I wish Kendall Oil was avail. in this area, no luck though...No codes present...I just went to Napa and purchased a pressure switch...Leak also appears to be coming from that general area...I will know more later after the work thing...thanks Pete Link to comment Share on other sites More sharing options...
KHE Posted October 28, 2005 Report Share Posted October 28, 2005 I just went to Napa and purchased a pressure switch...Leak also appears to be coming from that general area...I will know more later after the work thing...thanks Pete Have you verified that the oil pressure is OK? That is the first step I'd do before throwing parts at it... Don't install the switch from NAPA - buy one from the Cadillac dealer. The OEM sensors have a specific trip point that the aftermarket sensors do not seem to have. The result is that the aftermarket sensors will be much more likely to indicate low oil pressure when all is fine. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
DADCAD Posted October 29, 2005 Author Report Share Posted October 29, 2005 - buy one from the Cadillac dealer. The OEM sensors have a specific trip point that the aftermarket sensors do not seem to have. The result is that the aftermarket sensors will be much more likely to indicate low oil pressure when all is fine. I am partial to GM parts...Ordered at my dealer on my way home...returned Napa...Chking prerssure Sat...Thanks, stay tuned Link to comment Share on other sites More sharing options...
kyle01 Posted November 28, 2005 Report Share Posted November 28, 2005 - buy one from the Cadillac dealer. The OEM sensors have a specific trip point that the aftermarket sensors do not seem to have. The result is that the aftermarket sensors will be much more likely to indicate low oil pressure when all is fine. I am partial to GM parts...Ordered at my dealer on my way home...returned Napa...Chking prerssure Sat...Thanks, stay tuned How much did the sensor cost? Link to comment Share on other sites More sharing options...
DADCAD Posted November 28, 2005 Author Report Share Posted November 28, 2005 How much did the sensor cost? A whopping $5.00 and change...It was the switch...When unplugging the old one,oil was presentat the plug in...No problems after replacment...Thank you to everyone for the input... Link to comment Share on other sites More sharing options...
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