Weird Things just started- Electrical
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Weird Things just started- Electrical
A few years ago, I had a strange problem, and you guys on here told me just what it was, ( cam position sensor) and I had it fixed immediatly. I don't know about this one, but I'm keeping my fingers crossed. I have 1999 7.3 L. Power Stroke Diesel, about a week ago, first I noticed strange things going on, like my ADS light came on, then the Overdrive was flashing Off. Then my speedometer went crazy, one day I was slowing down to stop when I got to about 30-35 mph it would just drop to 0. I've been working long hours, and had not had time to check into this. Then today, it seems that it has just decided die if I go over 40 mph. It will start back up, but will die again if I get to 40 mph. I've checked and noticed to that my trailer lights don't work either. Does anyone have any ideas where to start?
Last edited by wagcoll; Jul 8, 2007 at 04:33 PM. Reason: added
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Joined: Jun 2007
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I dont know about the trailer lights and all.But rhe a.b.s. and the flashing o.d. lights,and some driveability problems are the same that I had.I changed the speed sensor(or A.B.S. sensor at napa) for $12 and all is well.Its located on the top side of the rear pumpkin.Its held in by one bolt.I had to pry the old out with a screw driver.Good luck
Originally Posted by wagcoll
A few years ago, I had a strange problem, and you guys on here told me just what it was, ( cam position sensor) and I had it fixed immediatly. I don't know about this one, but I'm keeping my fingers crossed. I have 1999 7.3 L. Power Stroke Diesel, about a week ago, first I noticed strange things going on, like my ADS light came on, then the Overdrive was flashing Off. Then my speedometer went crazy, one day I was slowing down to stop when I got to about 30-35 mph it would just drop to 0. I've been working long hours, and had not had time to check into this. Then today, it seems that it has just decided die if I go over 40 mph. It will start back up, but will die again if I get to 40 mph. I've checked and noticed to that my trailer lights don't work either. Does anyone have any ideas where to start?
Hotshot
Joined: Jan 2002
Posts: 17,988
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From: La La Land
dryfly's got it!
You need a new VSS, Vehicle Speed Sensor. It's the one thing common to all of your symptoms.
Easy to buy, locate, and change. Just use a brush or something to clear away the dirt around the sensor before you take it out so that dirt doesn't fall into the differential when you have it out.
Pop
You need a new VSS, Vehicle Speed Sensor. It's the one thing common to all of your symptoms.
Easy to buy, locate, and change. Just use a brush or something to clear away the dirt around the sensor before you take it out so that dirt doesn't fall into the differential when you have it out.
Pop
More Turbo
Joined: Feb 2004
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From: North Branford
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Post Fiend
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Laughing Gas
Joined: Jul 2003
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From: Littleton, Colorado
The speed sensor could cause the engine to die in addition to the other issues your having, as the PCM uses the frequency signal generated by the VSS (and other inputs) to control such parameters as fuel injection, ignition control, transmission/transaxle shift scheduling and torque converter clutch scheduling.
Since the VSS signal is generated by the (GEM) Generic Electronic Module and sent to the PCM, try pulling a Diagnostic Trouble Code as there is quite posibly one triggered.
Good luck,and keep us posted on your findings,
Austin
Since the VSS signal is generated by the (GEM) Generic Electronic Module and sent to the PCM, try pulling a Diagnostic Trouble Code as there is quite posibly one triggered.
Good luck,and keep us posted on your findings,
Austin
Fleet Mechanic
Joined: May 2005
Posts: 1,567
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From: Chattanooga
Ive melted my rear differential and sensor down twice, the truck kept running but the speedo didnt work. Ive also had a fuse go bad giving indications that I lost the vss. The fuse itself was losing contact on the sides but did not look burned at all. I replaced all the underdashed fuses because it was cheap and fixed what I thought was going to be a 3rd rear end. Trust me, its hard to troubleshoot on the road without the proper equipment but if its bound to happen, its happened to me in the middle of nowhere.
Post Fiend
Joined: Feb 2006
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From: Middle Tennessee
Oh, he said it is dying and he needs to restart. Dies again over 40. Not so sure this is the VSS as it seems to work up to 40. The VSS doesn't appear to be an item that quits after 40. I think we need to look elsewhere.
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You guys are pretty awesome!
I have to say this is really the best site and you guys are awesome. I finally got a free hour to to work on this, and put a new ABS sensor in. I am happy to report that this fixed the problems with my tow lights, speedometer, all the gauges, the cruise control ( not sure if I mentioned this but it would work sometimes, not others) the Overdrive light quite flashing, I think thats its! I did not get a chance to take this out on the highway, but I'm taking it in the morning, so I'll let everyone know if the "engine dying after it get to 40mph" is fixed also. I really thing it will be, it had to be this sensor. Thanks everyone for helping. Let you tommorrow.
