First off, I read a few of the posts similar (or exactly) like my issue. I'm looking for clarification on a couple points.
I just got a 1997 Astro Van 4.3, which I assume uses the 4L60E transmission.
It's been driving fine, but there was a delay in shifting when 1st started. Reverse was incredibly sluggish, even weak untill it had been driven a short time. (-15/-20C) After that, shifting from park to drive or reverse was 'normal'.
I was in a hurry when I checked my Transmission fluid, and ended up checking while it was not running, and it appeared to not be empty. (was up past the hatching)
We were going to the city doing 110 KM, slowed to 80 for a town, then upto 120 for primary highway speeds.
About 2-3KM later, I head the engine 'whine', and acceleration was lost.
After I pulled over, I check the fuild, it was low (about 2 litres low, so LOW), air filter, etc whatever was easily checkable for no power. I filled it to the proper levels while running after limping back to the town. (No change after)
I found that as soon as I hit about 60 under normal acceleration, the 'whine' returned, and power was lost.
It varied from 35-60 wether I had power or not, and going into 2nd had no issues.
Now I've read that this can be many things, from a solonoid (2-3?) to possibly a clutch?, wiring or just a wonky computer.
I pulled both fuses for the ECM and left it a good 10 minutes, although I read that pulling the cables does the same thing? (Assuming that pulling the fuses works in the 1st place)
I redrove it in town and nothing had changed, Drive and 3 both function up untill it wants to go into 3rd (I assume) around 40-60 depending on how hard I accelerate.
When I give it more thottle (normally when I give heavy throttle it shifts into some other gear, passing? OD?) it is still 'whining', although there is some power. I assume that it is shifting into the passing gear (or something), OR it is slipping and just the higher RPM is resulting in some power. (the power is 'weak', the engine is still whining, and I did not want to push it by giving more throttle to see if it is just the passing/od gear being weak due to only going 60ish km/h)
By whining, it basically sounds like it's not in gear at all.
So what I'm looking for is clarification to some things I would like to check, as I have to goto my works shop to tinker.
- If I drop the pan, do I need to drain any fluid first? (I'd think so?)
- If I'm checking for debrise what is considered normal or not? (Obviously anything metal, shavings, pieces, chunks, larger 'stuff' is bad)
- If I'm to check the soloniod is there a way to test it? (Can I swap soloniods to see how that affects it?)
- Is there any way to check the wiring for the soloniod? (out side of visual)
- My Haynes Manual has no mention of soloniods (anything internal is skipped), but does mention a TV Cable. Could this be the cuplrit?
- Is there a good 2L variance between running and not while checking tranny fluid? (And yes, I know, bad. I should have spent the time doing it right the 1st time!)
Any other general observations or suggestions on things to check or test while I've got it at the shop?
I'm REALLY hopping this isn't a done transmission.
PS! I've got no check engine light (I can't find one on the dash), so I have no idea if there's any codes or not.