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Discussion Starter #1
Lately, in my 98 1500 quad cab 5.9 sport, I'll brake hard, and today even semi hard (maybe I'm paranoid lol), as I'm coming to a stop, and at like 8mph the oil pressure kicks completely to zero, on the stock oil pressure gauge. The light saying check gauges comes on. This started only about a week ago, but the trucks rather late for an oil change is one thing, already passed 4k, maybe 5k...(overall had 115k'ish) And I'm waiting for a check to show up and get it changed asap, but I'm worried about driving to work until that happens, at least a week, while this oil pressure thing its going in, incase the engine takes damage in the mean time.

Plus, I do not notice any change whatsoever in the engine sound, no vibration at all (out of the ordinary anyway), which leads me to believe some sensor or whatever might be giving a false reading... I read online that these use an electronic pressure deal, which could maybe possibly have something to do with it?

What's your thoughts guys? Old oil clogging some strange part up? Electrical malfunction? Really losing all my oil pressure suddenly at quick stops?

Trucks in decent shape - I don't push it too hard, and have not had really any problems with it since purchase a year and a half or so ago, at 106k miles.
 

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when mine did this it was a faulty oil pressure sensor...however, my check ngine light didnt come on...just the pressure guage dropped at idle/stops.
 

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Discussion Starter #4
Its not the check engine light, its the "check gauges" light, which comes on whenever a gauge drops too far, or something like that. I drove like fifteen miles yesterday, and its almost for sure not actually losing any pressure, like the idle changes none, and when accelerating out of the stops, there is no lack of power or response. Kind of has me thinking its some sensor. I'll look into this - any idea what you ended up paying for your part? Did you install yourself? I'm not the greatest at wrenching, but if its doable I'll do it myself.
 

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Discussion Starter #6
Awesome, had just priced that exact part at thirty something, I'll report back if this takes care of it or not. Probably gonna go for the mopar part even if its a little more. Thanks for the advice!
 

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hey good luck man...

i was worried about this too, but it was a simple fix for me...

hell even my gas guage didnt work in my old 96, but i sure miss it!!! i had to reset the trip meter every trip and never went more then 400 km before i filled up again!!!:LOL:
 

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Discussion Starter #8
Lol, I love this old truck - been nothing but dependable and powerful over the time I had it, that's why I'm always coming here with my problems, to really keep it going as long as I can. Mopar forever is how I'm feeling about these trucks.
 

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When my then new Shelby Dak started doing that it was due to hard running on a hot day. The factory 10W30 couldn't hold up. Later, when due for an oil change it'd do the same thing. A switch to 20W50 solved the problem.
 

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This may sound like a dig and it's not, but... Have you checked the oil? I say this because my '98 did this when the oil was low. I had a plenum leak so there was no oil on the ground it ended up clogging the cat and it ran like crap at that point. I bet you're down about 3 quarts.
 

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Discussion Starter #11
I think its still got oil left, but its getting pretty black from being late for a change. Might be lower since i last checked. I'll do the oil change first here next week, then if the light remains at stops, the send unit.
 

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My 98 5.2 did this and I was losing oil due to a plenum leak as well. Was going through about 3 quarts every othe week or so.
 

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My 98 5.2 did this and I was losing oil due to a plenum leak as well. Was going through about 3 quarts every othe week or so.
WOW 3 quarts every other week. :SHOCKED: Mine was only loosing a quart a month.
 

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Discussion Starter #14 (Edited)
Umm yeah I'm pretty sure that's not happening, but your making me nervous lol, I will double check the oil level when I go out later. I think its really an electronic thing, and at this point I really hope so! Sounds like the other possibilities are much more severe. What's a plenum leak mean? Does that mean like burning off oil?

Edit: ok read up in that, sure hope I'm not experiencing this, checked the oil, both running and off, does seem low when off, but perhaps even too much while its running... I'll try to get under the top off the engine to check the possibility of plenum leaking going on... Gulp...
 

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If your overdue for an oils change you might be down abit in oil,this is normal. Change out the sensor that's the most common problem. For the needle dropping down and your light coming on. I have also seen these sensors leak abit also causing the same problem.
 

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Discussion Starter #16
Well here either later today, or early next week I'll be doing the oil change finally, and possibly tranny fluid if I'm feeling ambitious. I'll take it for a spin and brake hard and turn tight, and if that light beeps at me I'm gonna turn around and get that sensor right away. I'll be sue to let you guys know how low it really turns out to be, and if i have to get that part put in or not.
 

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If this is happening when you brake hard or turn sharply, my money says it's not a sensor issue. You probably have a sludge/pickup/pump issue.
 

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Discussion Starter #18 (Edited)
Oil change did the trick. Old oil must have been screwing with the sensor... Was low, probably to be expected this late to change. Thanks for all the help guys!

Edit: oh hey, obviously don't forget to change the filter, and if your oil is not getting old, it could be really low! Do check both of those first if you get this problem, now its running like a champ. I used castrol high mileage Dino oil if that matters at all.
 

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Oil change did the trick. Old oil must have been screwing with the sensor... Was low, probably to be expected this late to change. Thanks for all the help guys!

Edit: oh hey, obviously don't forget to change the filter, and if your oil is not getting old, it could be really low! Do check both of those first if you get this problem, now its running like a champ. I used castrol high mileage Dino oil if that matters at all.
If your oil was that low between changes, I'd bet you have a blown plenum pan gasket. Fix that and your consumption problem will go away.
 
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