atechbuy
New Member
- Joined
- November 29, 2008
- Messages
- 4
- Reaction score
- 0
- City, State
- Sharpsburg, GA
- Year, Model & Trim Level
- 94 Sport
1994 Explorer Sport - best vehicle I have ever owned - 378,000miles - original motor and transmission.
Transmission full-flush service about ever 30k
1. About 6 months ago the truck seemed weak/slow getting up to speed - it would take-off fine, but after 2nd gear it seemed to take much longer than normal to hit 55-60 - especially if it was cold out - laying on the gas hard would help, but i didn't want to damage it worse if it was slipping. It would eventually make third and then fall into OD.
2. A few months later, reverse would not engage one morning when it was cold - i put the truck in drive and it also would not engage. I stopped and shiffted from reverse to drive a couple of times and it started to engage in both directions - fluid level was about 1/2 quart low - first time I have ever found the fluid low.
No leaks visible on the ground. Truck has always had the external cooler as well. Drove fine, but still with issues #1 above.
3. A couple of months later - overdrive seemed to get weaker - meaning it would normally stay in overdrive just fine at 35+ MPH even on a moderate uphill grade - now it started to downshift far more than it ever had. It would normally do about 1600rpm @ 55mph.
4. Then overdrive "left the scene" - truck ran fine but would not shift to overdrive even on a flat surface at 55.
5. The next morning(very cold), I took it out to see if I could find the issue - truck would not come out of first gear.
6. A week later - I grabbed my ez-scan and did a few tests:
If I manually shifted the truck to 1rst it did drive in 1rst.
If I manually shifted the truck to 2nd it did drive in 2nd.
If I manually shifted the truck to D it drove in 1rst.
If I manually shifted the truck to [D] it drove in 1rst.
Check oil light was on during warm-up - this cleared on it's own after the tests. Odd....
KOEO is PASSING
KOER has a 536, but that looks to be an operator error with the ez-scan unit - I get it on my 93 explorer as well.
CEL flickers during the WOT test portion - don't know if that is important.
As I was manually shifting through gears, it started shifting normally except for over drive - its running 2000 rpm @ 55mph.
Cruise works, but seems to have an intermittent surge - very slight, but not going uphill.
In the past year - I have seen the speedometer go haywire 4-5 times - once you get past 60, the needle will swing forward to about 75mph to bottom-center of the gauge. If you lift the accelerator a bit it will return to your actual speed - it will eventually stop on its own or if you turn the truck off and restart (Reboot an exploder?)
Any advice would be helpful - maybe its just 378,000 miles catching up to it.
Thanx
Transmission full-flush service about ever 30k
1. About 6 months ago the truck seemed weak/slow getting up to speed - it would take-off fine, but after 2nd gear it seemed to take much longer than normal to hit 55-60 - especially if it was cold out - laying on the gas hard would help, but i didn't want to damage it worse if it was slipping. It would eventually make third and then fall into OD.
2. A few months later, reverse would not engage one morning when it was cold - i put the truck in drive and it also would not engage. I stopped and shiffted from reverse to drive a couple of times and it started to engage in both directions - fluid level was about 1/2 quart low - first time I have ever found the fluid low.
No leaks visible on the ground. Truck has always had the external cooler as well. Drove fine, but still with issues #1 above.
3. A couple of months later - overdrive seemed to get weaker - meaning it would normally stay in overdrive just fine at 35+ MPH even on a moderate uphill grade - now it started to downshift far more than it ever had. It would normally do about 1600rpm @ 55mph.
4. Then overdrive "left the scene" - truck ran fine but would not shift to overdrive even on a flat surface at 55.
5. The next morning(very cold), I took it out to see if I could find the issue - truck would not come out of first gear.
6. A week later - I grabbed my ez-scan and did a few tests:
If I manually shifted the truck to 1rst it did drive in 1rst.
If I manually shifted the truck to 2nd it did drive in 2nd.
If I manually shifted the truck to D it drove in 1rst.
If I manually shifted the truck to [D] it drove in 1rst.
Check oil light was on during warm-up - this cleared on it's own after the tests. Odd....
KOEO is PASSING
KOER has a 536, but that looks to be an operator error with the ez-scan unit - I get it on my 93 explorer as well.
CEL flickers during the WOT test portion - don't know if that is important.
As I was manually shifting through gears, it started shifting normally except for over drive - its running 2000 rpm @ 55mph.
Cruise works, but seems to have an intermittent surge - very slight, but not going uphill.
In the past year - I have seen the speedometer go haywire 4-5 times - once you get past 60, the needle will swing forward to about 75mph to bottom-center of the gauge. If you lift the accelerator a bit it will return to your actual speed - it will eventually stop on its own or if you turn the truck off and restart (Reboot an exploder?)
Any advice would be helpful - maybe its just 378,000 miles catching up to it.
Thanx
