I've done some searching and I can't find anything that might explain why my car went into limp mode the other night. I had finished a long flight back for
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10-23-2009, 11:49 PM | #1 (permalink) |
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Unexplained Limp Mode
I've done some searching and I can't find anything that might explain why my car went into limp mode the other night.
I had finished a long flight back for work and got to the car around midnight in Texas. Them temperature outside was around 55F when I started the car. I drove about 18 miles in 6th gear at an average of 2650rpm (65mph). I turn off the highway and begin my back roads trip to the house when I'm startled to have no power. At first I thought it was VDC pulling power but I wasn't even getting on the car, so I tried to accelerate normally and BAM, no power. Looked at the tach and it would hit 3500rpm and not give me anymore. Shifted to 2nd, 3rd, 4th and tested the gears, couldn't get past 3500rpm. Turned off VDC to make sure that wasn't faulting the ECU, still could not get past 3500rpm. I had read that high oil temps cause limp mode, but I glanced at that temp and it was reading 180. Remember, it was a cold night and I was just trying to get home to get in bed. Now, I'm kinda freaking out because I can't even find a reason WHY it would want to go into limp mode. No warning light, no code, nothing, it was frustrating. Also, I assumed (also read around here) that limp mode was capped at 5500rpm and not 3500. So this also raises my concerns as to why it would do this. If anyone has information on why or how to possibly find a reason for this, it would be awesome. I hope this isn't a trend the car will continue to have causing major work to fix it. Thanks |
10-24-2009, 12:05 AM | #2 (permalink) | |
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10-24-2009, 12:15 AM | #4 (permalink) |
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sorry to hear that! I'd closely monitor for a while. I've personally never witnessed limp mode. All and all , It is a machine and is prone to fail ; nothing is perfect. Do some searching for the service manual, it's on here somewhere. Research what it says about causes.
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10-24-2009, 12:28 AM | #6 (permalink) |
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You DID NOT hit the limp mode. As a matter of fact, your stalling had NOTHING to do with oil temp. I have seen couple of threads like this but I can't seem to locate them now. I have to manually search them page by page. Give a little time. If I recall correctly, when they shut the car off, car reset itself and everything was fine. Did your car reset itself as well? did you unplug negative battery to reset the ECU?
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10-24-2009, 12:35 AM | #7 (permalink) | |
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The only other clue that could mean anything is I had just clocked 3000 exact miles on the car during the 18 mile trip. But in order for me to prove this, I'd need a poster who is close to hitting that to test the before and after response of the car while it is still running, shutting off the car would just reset it. I wonder if there is any documentation that would point to a 3000 mile point and warn you of this "inconvenience". Last edited by Dallas-Z; 10-24-2009 at 12:40 AM. |
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10-24-2009, 12:42 AM | #9 (permalink) | ||
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10-24-2009, 12:53 AM | #11 (permalink) | ||||
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Transmission continued to rev while in neutral...
not quite what you've experienced but happened exactly at 3000 miles Quote:
Possible limp mode? Quote:
Quote:
limp mode for no reason at all? Quote:
thanks. AK
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10-24-2009, 07:48 AM | #12 (permalink) |
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like someone said before, could be a sensor that malfunctioned or was accidentally disconnected. things like these can confuse the heck out of the ecu. i remember once i was doing work on my old intrepid, and forgot to reconnect the camshaft position sensor, which caused the ecu to cut engine rpm at 3500
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10-24-2009, 10:57 AM | #13 (permalink) | |
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10-24-2009, 11:54 AM | #14 (permalink) |
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Somebody please find my old Buick that only had an engine with 8 spark plug wires and a couple of coolant hoses outside the block and nothing remotely resembling a computer. Thank you in advance.
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10-24-2009, 11:59 AM | #15 (permalink) |
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got a 71 c10 c/d sitting in storage. has a very similar motor
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