JeffKPDX
Registered User
In the last few days my 92 idi NA started going into limp mode when shifting into 3rd. It doesn't happen every time but it seems to eventually happen if I drive long enough. It also happened when shifting form 1st to 2nd and from 3rd to 4th but the vast majority has been when going into 3rd. If I shut it down and turn the key back on the OD flashing stops and it'll crank fine and run fine again until it shifts into 3rd. Usually I'd pull a code with the key on and engine off but since it reverts back I haven't been able to.
Previously and unrelated to this issue I have replaced my tone ring, speed sensor, and PCM so I'm hoping those are excluded from what's wrong. I've also had my trans rebuilt with a HD torque convertor so I'm hoping it's electrical and not actually anything wrong with my trans. I replaced the FIPL today and it did drive better and seem fine for awhile but then when shifting into 4th it happened again. The RPMs are displaying properly so I don't think it's my tach sensor.
While looking for a solution I saw a comment by aggiediesel01 mentioning that the brake light circuit and TCC solenoid circuit are connected and that can cause a similar issue. I do have a trailer brake controller. Would that affect the brake light circuit? I have had issues with the ABS light going on in the past and it does feel like my brakes lock up quicker than they should when I brake hard. Like they will lock if I brake hard at 35. Is there a way to determine if this is the issue?
Any thoughts on other routes I should explore?
Much thanks!
Previously and unrelated to this issue I have replaced my tone ring, speed sensor, and PCM so I'm hoping those are excluded from what's wrong. I've also had my trans rebuilt with a HD torque convertor so I'm hoping it's electrical and not actually anything wrong with my trans. I replaced the FIPL today and it did drive better and seem fine for awhile but then when shifting into 4th it happened again. The RPMs are displaying properly so I don't think it's my tach sensor.
While looking for a solution I saw a comment by aggiediesel01 mentioning that the brake light circuit and TCC solenoid circuit are connected and that can cause a similar issue. I do have a trailer brake controller. Would that affect the brake light circuit? I have had issues with the ABS light going on in the past and it does feel like my brakes lock up quicker than they should when I brake hard. Like they will lock if I brake hard at 35. Is there a way to determine if this is the issue?
Any thoughts on other routes I should explore?
Much thanks!