OK, well that explains it then. I've had this engine to 6K multiple times already, so I need to figure out what's going on with the SDS.
Rob, would that explain the goofy wideband readings when I let off the gas as well? That just started last night. It's like the ECU completely cuts fuel when I let off the gas.
Also to answer wheming's question, I do not have the ability to change the tune yet. All I have done is run MPScan and recorded a few datalogs.
When I was replacing the input shaft seal on my tranny the speed sensor wires were melted together. Worth checking.
89 Voyager LE, 2.5T2 - rest in peace
87 Charger Shelby T2 (2.4 conversion in process)
I've always found that my cars go way lean when I totally let out of the gas, if only momentarily. I usually have them set up to cut fuel when I'm off the gas so after I've tweaked it, the car will be lean until I get back in the gas.
I kind of assume that's what mine is doing, because if I just push the gas a little it comes back in the normal range. It just waits so long, it dies. But that might be related to the VSS issue I have. Because as I remember, doesn't the ECU look for the vehicle to slow down before adjusting idle? If it's not seeing it, it won't make the adjustment. I'll get under it tomorrow and see if it just came unhooked, or if I have a bad sensor.
Greg, I'll offer this MPScan user tidbit (free of charge even!)...
Eventually you may want to export datalogs into spreadsheets, and Morris has the export to .csv already setup to do that easy (i even save them with the same filename as my .mpl file). But you'll see the order that the gauge columns appear in the .csv is in the same order the gauges were added to the dashboard.
So, when i discovered that, i rebuilt my dashboard layout adding the gauges in the order i wanted them in the spreadsheet.
You can of course shuffle them around once in the spreadsheet, but it is easier always having the files be the way you prefer.
Wayne H.
'91 Dodge Spirit ES 2.5L turbo 5spd
'05 PT GT 2.4T HO autostick (RIP)
'89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
'89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
and other cars, trucks and motorcycles
https://www.youtube.com/user/SlugmobileMeanMini
After doing some checking last night, I'm pretty sure the VSS is bad. Got under the truck, and it was plugged in. I get good speed readings on my speedometer, which is mechanical, so I know it's rotating fine.
I hooked up the laptop, started the truck, and dropped it into 2nd gear on the jack stands, and I get zero speed on MPScan. So I guess I stop tonight & pick up a new one...
It sucks that I can't even update to the newer hall effect version, because I need the mechanical output for my stock speedo...
Have you seen this? http://minimopar.net/speedsensor.html#convert
I have repaired my speed sensor before. Since they're still available there's not much point but I just wanted to see if I could do it. You see the reed switch in the picture on minimopar? Those can be found inside the cheap door alarms you get at the hardware store. The ones with the magnet that mount on the door frame with double sided tape. If you can solder it's very easy to remove the old one and replace it. Mine was shattered and was permanently shorted.
If you hold it up to your ear and spin it you should be able to hear the switch closing. You can also test it with an ohmeter. You should get 8 shorts/clicks per rotation.
Update:
After waiting 3 days for delivery, first new speed sensor I bought from O'Reilly's was bad out of the box. So found an Autozone in the next city over that had one in stock. Fixed my issue, and now run like it did before. Going to try and put a few miles on it this next week before taking it to the show in Kokomo next Sunday. Hopefully that's the end of the issues for a while...