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2005 Envoy 4.2 Oil Pressure Low (DIC)
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MarineGrunt
Enthusiast
Jan 17, 2015, 8:54 AM
Post #1 of 25
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2005 Envoy 4.2 Oil Pressure Low (DIC)
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2005 GMC Envoy XL 4.2 4WD
I just changed the thermostat. Got it all back together and let it warm up to get the coolant to the proper level. Not the dic is saying that the oil pressure is low and to shut down the engine. The oil pressure gauge reads zero.
I removed the alternator in order to make it easier to get to the thermostat. Are there any wires or harnesses I could have bumped or pinched that could relate to this? The alternator and thermostat are over by the under hood fuse box so I guess a wire could be a possibility. If not, is there a way to test the oil pressure sender or the stepper motor?
I guess I should have added that the oil was changed about 500 miles ago and is at the proper level.
Thanks!
(This post was edited by MarineGrunt on Jan 17, 2015, 9:01 AM)
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Tom Greenleaf
Ultimate Carjunky
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Jan 17, 2015, 9:24 AM
Post #2 of 25
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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I didn't find location for the switch/sender but if really ZERO you know it would sound it and seize in no time so it must be wrong, disconnected or pinched as you suspect. Where wires are run I'll never know for sure but would check pressure manually at least to verify it's fine until you find where it's broken and doubt switch itself if just happened with the recent work.
Stay warm buddy! Tom
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Hammer Time
Ultimate Carjunky
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Jan 17, 2015, 10:03 AM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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MG, have you found the oil pressure sender?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
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Jan 17, 2015, 11:42 AM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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I am NOT coming up with credible info - sorry. I think this should be a three wire plug in that fits many GM vehicles. Wire colors should be a black w #s on it? beige one, and a light blue.
(edit - pic didn't show but this was where I looked,
http://www.napaonline.com/...R-ECHEC89_0334769523 )
Dang pic better show^^^^
Pigtail in stock at NAPA and Autosnooze's site shows a screw in (would expect that) but very old type gauge with a dome then a plug that wouldn't fit so screw that.
This just can't be NO oil pressure without obvious problems right now so it must have wires where you were working.
Guess I'd go back and look with alternator back off if anything got squished? Otherwise left to wild guessing for location, down rear under but visible by intake manifold or near oil filter? No clue why info is so lousy on this? Tom
(This post was edited by Tom Greenleaf on Jan 17, 2015, 11:43 AM)
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MarineGrunt
Enthusiast
Jan 17, 2015, 11:51 AM
Post #5 of 25
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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After posting and waiting for replies I sprayed down some of the coolant that was around the engine from the t stat replacement and dried it with air just to clean everything up. I started it back up and everything is fine. Gauge is reading normal and no more warning on the dic.
On alldata there's an oil pressure sensor that's located by the filter. It also lists an oil pressure sender but doesn't have any diagrams or repair information. It does list a part number and price though. Not sure what the deal is there.
If the stepper motor is bad would that cause the dic to warn you or is both the stepper motor and the dic sent information via the sender or sensor? I've heard that stepper motors are a known problem but don't know if that would trigger the dic to give a warning. I wouldn't think it would so if it happens again would it likely be the sensor?
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MarineGrunt
Enthusiast
Jan 20, 2015, 8:51 PM
Post #6 of 25
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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I did find the sender HT. It's right above the oil filter. There wouldn't be another one, would there?
Finally had time to dig in deeper. I checked pressure with a gauge. At idle it reads about 16 psi. At around 1200 rpm's I'm getting about 35 psi. Alldata says 12 psi minimum at 1200 rpm's. Obviously it isn't low but what is the ideal psi? What is considered too high? I took the above readings when the engine was at normal operating temps. When I first started the engine, and it was cold, pressure was 76 psi. It was sitting in my garage overnight and all day so the engine was freezing cold at start up. I guess non of that matters since the reading is taken at normal operating temp.
There is a little oil seepage that looks to be running down the filter. The oil sender is right above the filter. When I took the electrical connector off it looked like there was some oil inside the sender. I don't think the filter is leaking but rather the sender. I guess with oil inside the electrical connector it has to be.
I guess I mainly want to know how the readings look. I've never had to check oil pressure so just wondering if a reading can be too high.
Thanks!
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Tom Greenleaf
Ultimate Carjunky
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Jan 20, 2015, 9:44 PM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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Oil inside plug to sensor! Send that one to the circular file.
76PSI oil pressure? Was that just a split second spike or what? It shouldn't be able to go and stay that high no matter what?
T
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Hammer Time
Ultimate Carjunky
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Jan 21, 2015, 3:05 AM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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Those pressures sound fine MG. I'd probably throw a new sender at it and see what happens.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
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Jan 21, 2015, 8:53 AM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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Hey, you happy about your new coach?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MarineGrunt
Enthusiast
Jan 21, 2015, 11:30 AM
Post #11 of 25
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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You know, I am happy with their choice. Fox has never been that coach that I really like but he isn't one I don't like. You know what I mean. There are those coaches you can't stand. Normally the Bears pick up some guy that has never been a head coach or even in the NFL because they're too cheap. Fox has quite a bit of experience and has been around the league for a long time. Really, the Bears should've been better than what they were. If you look at their receivers, Forte, and even Cutler they should've won more games than they did. Look how Cutler did in Denver. There's no reason he can't play the same in Chicago. I think they just need to find an offense that suits him. Hopefully Fox can get the D back on track and help Cutler pull his head out of his backside. Cutler's main problem is his arrogant attitude. I can't stand him for that. I say give Fox a couple years. If he doesn't perform it's time to bring Ditka back! Then again, Fox has a better when % than Ditka. I just grew up with Ditka as coach so I've always liked him. He did awful with the Saints though.
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Hammer Time
Ultimate Carjunky
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Jan 21, 2015, 2:11 PM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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Isn't Fox the guy that chased Cutler out of Denver?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Double J
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Jan 21, 2015, 2:40 PM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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No, that was Josh Mcdaniels
Hopefully he can come here and chase him out of town again...
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Double J
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Jan 21, 2015, 2:44 PM
Post #14 of 25
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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Matter of fact, He'd look better in a Dolphins uniform.
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Hammer Time
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Jan 21, 2015, 2:53 PM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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No, thank you
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
Ultimate Carjunky
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Jan 22, 2015, 3:18 AM
Post #18 of 25
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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My neighbors have no doubt who my team is. Remember, around here the doors and windows are usually open in the winter.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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MarineGrunt
Enthusiast
Jan 22, 2015, 7:48 AM
Post #19 of 25
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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How did I know we were going to get that warm weather rubbed in our face....There's just no comeback for that one. The only thing I can hold onto is that even if I have 0 degree weather here I usually have 10+ degrees on Double J. Maybe more if the wind is whipping off of lake Michigan.
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Hammer Time
Ultimate Carjunky
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Jan 22, 2015, 7:56 AM
Post #20 of 25
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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Well, I do have to put the heat on sometimes when it drops into the low sixties during the day.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Jan 22, 2015, 7:58 AM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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LOL, MG - Of course they must brag that they can leave doors and windows open for Winter because they don't want to mention the whole rest of the year they are cowering for their life from man eating bugs, humidity that you can cut so take a swim and get stung or bitten by some newfangled protected species of something that could eat thru a space shuttle's heat tiles.
Cold for a few months doesn't sound so bad sometimes. Just kidding all around, Tom
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Hammer Time
Ultimate Carjunky
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Jan 22, 2015, 8:24 AM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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Tom, you should get some help for the phobia you have about tropical life. I'm not bothered with any of those things. I saw more mosquitos up north than I see here, but them I don't hang out in the bushes at night.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
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Jan 22, 2015, 5:50 PM
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Re: 2005 Envoy 4.2 Oil Pressure Low (DIC)
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Hey, nothing like going camping at Fort Desoto and leaving your window down on your station wagon that was full of food. Then coming out the next morning to find the raccoons had a party inside along with raccoon crap everywhere, including the wiper cowling.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 22, 2015, 5:50 PM)
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