92 explorer overdrive slip
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New User
Joined: Feb 2003
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From: Boston
92 explorer overdrive slip
I have a 92 explorer with 165K on it. Tranny was re-built at 120K. Now when driving long distances (especially in the mountains) it starts slipping out of overdrive, sending the rpms up. It will bump in and out of overdrive causing the check engine light to come on and go off. Another symptom is that when i take it off the highway (in this condition) the idleing rpms will shoot up to 1800 when I put it in park (usual is about 800). If I allow the truck to rest a couple hours the condition goes away.
I checked the fluid, thought it was low and added half a pint. Condition persisted so i got off the hiway drove backroads for half an hour. Got back on the highway and everything was fine. (at the end of the trip rpms still shot up when put in park).
appreciate any help
I checked the fluid, thought it was low and added half a pint. Condition persisted so i got off the hiway drove backroads for half an hour. Got back on the highway and everything was fine. (at the end of the trip rpms still shot up when put in park).
appreciate any help
Elder User
Joined: Aug 2002
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From: Cincinnati
92 explorer overdrive slip
which gives you a check engine light. I don't know of any transmission problem that ill give a check engine light till the 95 model. The transmission is sensitive to manifold vacuum and a poorly running engine will cause shifting problems as well as a bad TPS. The high idle is a different issue which I have in my 92. I diagnosed this to the IAC solenoid driver circuit in the EEC. I temporarily designed another circuit to operate the IAC independent of the computer. This vehicle is off the road till spring when I will work on a permanant solution.
Get your code read first. You can do this yourself with the procedure on www.batauto.com click on tech on the right.
Get your code read first. You can do this yourself with the procedure on www.batauto.com click on tech on the right.
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New User
Joined: Feb 2003
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From: Boston
92 explorer overdrive slip
The check engine light is coming on as the engine/transmission is slipping in and out of overdrive (4th gear)(automatic trans). This is occurring on the highway at about 60 mph when the rpms usually run just about 2000.
When it slips the rpms jump to 2700. It does this back and forth, but mostly it is out of 4th and at 2700rpm. This causes the check engine light tol come on intermittenly then correct itself and go off.
Seems to only happen on longer trips when the engine hot (after 2 hours of driving) I had no problems on the way to work today, and the rpm's where normal when I put it in park.
When it slips the rpms jump to 2700. It does this back and forth, but mostly it is out of 4th and at 2700rpm. This causes the check engine light tol come on intermittenly then correct itself and go off.
Seems to only happen on longer trips when the engine hot (after 2 hours of driving) I had no problems on the way to work today, and the rpm's where normal when I put it in park.
Elder User
Joined: Aug 2002
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From: Cincinnati
92 explorer overdrive slip
In the transmission are the 3-4 shift solenoid and the TCC lockup solenoid. These are controled by the computer and it does not check for slip. The computers only input to control these is the brake switch (BOO) and the TPS. So a light at the time this happens probably indicates an intermitant TPS.
Senior User
Joined: Jun 2000
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From: CANADA
92 explorer overdrive slip
Opera House is right. I had this happen exactly as you describe back around 2 years ago. I ran the codes and the throttle position sensor (TPS) was bad. I replaced it and it didnt' happen again.
Hoppy
Hoppy
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