NEED HELP, ASAP!!! 700r4
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,625
Likes: 1
From: Zagreb, Croatia
It's the same converter and flexplate, but this might be something looking into. If I remember correctly, I had to pull out the converter, to the flexplate, a little less than 1/2", maybe 1/3". But it bolted and spinned without any issues.
But if the converter isn't in the pump, there wouldn't be any fluid flow through cooler lines?
And the lines are warming up as the trans is warming up..
But if the converter isn't in the pump, there wouldn't be any fluid flow through cooler lines?
And the lines are warming up as the trans is warming up..
Melting Slicks
Joined: Nov 2008
Posts: 2,765
Likes: 5
You should remove the top transmission cooler line off of the radiator of your Corvette as Pete K. has advised yesterday And start the car to check for Adequate transmission oil pump flow.
Just because the lines are heating up with engine running time does not mean there may be enough flow.
Remove the top line with a 1/2" open end wrench or better yet a 1/2" line wrench.
Take a 3/8" section of rubber fuel line hose. Push it onto the top cooler line about 1".
Take the other end of the rubber hose and put it into an old coffee can or bucket.
Start the car and see if Trans oil comes rushing out, should collect a quart of oil in no time, Maybe 20 seconds or less.
Pete K. is definitely a C4 Auto trans expert. Listen to his advice 1st here on Corvette Forum.
Post your results after you do this test.
Just because the lines are heating up with engine running time does not mean there may be enough flow.
Remove the top line with a 1/2" open end wrench or better yet a 1/2" line wrench.
Take a 3/8" section of rubber fuel line hose. Push it onto the top cooler line about 1".
Take the other end of the rubber hose and put it into an old coffee can or bucket.
Start the car and see if Trans oil comes rushing out, should collect a quart of oil in no time, Maybe 20 seconds or less.
Pete K. is definitely a C4 Auto trans expert. Listen to his advice 1st here on Corvette Forum.
Post your results after you do this test.
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,625
Likes: 1
From: Zagreb, Croatia
I know that Pete is "the man" for the transmissions and I plan to follow his advice. He was also very helpful when I was rebuilding my trans. He sent me all of the parts, plus he was helping me through the process.
I can't work on the car today, but I hope to test this tomorrow, after I get the car back from exhaust shop.
I can't work on the car today, but I hope to test this tomorrow, after I get the car back from exhaust shop.
Racer
Joined: May 2010
Posts: 315
Likes: 0
From: Central New York NY
By the description of how the engine blew, it sounds like the tranny let go first. You don't expect to have to lift driving an auto so when something happens the reaction time is a little longer. Hence the over rev and blown engine. If a shaft in the tranny snapped could it still have pressure in the output line?
Moon
Moon
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,625
Likes: 1
From: Zagreb, Croatia
Maybe worth mentioning is that I did have some problems with trans but I'm not sure if it can be in any way related to what is happening now.
I had to release the throttle to get 3-4 shift if I shifted above ~4500, below that it would shift with WOT (remember, I have converted to manual shift, so I can shift at any rpm).
And sometimes, with trans fully heated, after some abusing, when I shifted to 4th and held WOT, trans would sometimes just let go and revved freely. As soon as I released the throttle it would engage 4th gear again. This was not allways situation, but sometimes it happened.
I had to release the throttle to get 3-4 shift if I shifted above ~4500, below that it would shift with WOT (remember, I have converted to manual shift, so I can shift at any rpm).
And sometimes, with trans fully heated, after some abusing, when I shifted to 4th and held WOT, trans would sometimes just let go and revved freely. As soon as I released the throttle it would engage 4th gear again. This was not allways situation, but sometimes it happened.
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,625
Likes: 1
From: Zagreb, Croatia
OK, here is an update, finally.
I've tried what Pete suggested and it looks like ther might be a problem with the pump. As soon as I start the engine, fluid starts to flow, but it flows for a very short period of time and than it stops. (Take a look at the video).
Fluid level was in the middle between min and max when I tried this.
Opinions? Pete?
http://www.youtube.com/watch?v=cmi5qbBPO8E
.
I've tried what Pete suggested and it looks like ther might be a problem with the pump. As soon as I start the engine, fluid starts to flow, but it flows for a very short period of time and than it stops. (Take a look at the video).
Fluid level was in the middle between min and max when I tried this.
Opinions? Pete?
http://www.youtube.com/watch?v=cmi5qbBPO8E
.
Last edited by Sliding; Jun 22, 2010 at 01:59 PM.
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Based on the video it looks like the pump is shot or is not being driven by the converter.
One other thing.....I'm a little confused, how did we go from this statement in your first post;
Trans was out of the car for 9 months, but it ran normally when i removed it.
To this one in your post #25?
Maybe worth mentioning is that I did have some problems with trans but I'm not sure if it can be in any way related to what is happening now.
I had to release the throttle to get 3-4 shift if I shifted above ~4500, below that it would shift with WOT (remember, I have converted to manual shift, so I can shift at any rpm).
And sometimes, with trans fully heated, after some abusing, when I shifted to 4th and held WOT, trans would sometimes just let go and revved freely. As soon as I released the throttle it would engage 4th gear again. This was not allways situation, but sometimes it happened.
One other thing.....I'm a little confused, how did we go from this statement in your first post;
Trans was out of the car for 9 months, but it ran normally when i removed it.
To this one in your post #25?
Maybe worth mentioning is that I did have some problems with trans but I'm not sure if it can be in any way related to what is happening now.
I had to release the throttle to get 3-4 shift if I shifted above ~4500, below that it would shift with WOT (remember, I have converted to manual shift, so I can shift at any rpm).
And sometimes, with trans fully heated, after some abusing, when I shifted to 4th and held WOT, trans would sometimes just let go and revved freely. As soon as I released the throttle it would engage 4th gear again. This was not allways situation, but sometimes it happened.
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,625
Likes: 1
From: Zagreb, Croatia
I guess that after all the problems that I've had with this trans over
last 10 years, I started to think that it actually ran normally.
If anybody is interesed in all that I've done to the transmission
and what it worked like here are 3 topics with all the details
http://forums.corvetteforum.com/c4-t...e-rebuild.html
http://forums.corvetteforum.com/c4-t...e-results.html
http://forums.corvetteforum.com/c4-t...ions-suck.html
last 10 years, I started to think that it actually ran normally.
If anybody is interesed in all that I've done to the transmission
and what it worked like here are 3 topics with all the details
http://forums.corvetteforum.com/c4-t...e-rebuild.html
http://forums.corvetteforum.com/c4-t...e-results.html
http://forums.corvetteforum.com/c4-t...ions-suck.html
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Race Director
Joined: Feb 2004
Posts: 12,518
Likes: 19
OK, here is an update, finally.
I've tried what Pete suggested and it looks like ther might be a problem with the pump. As soon as I start the engine, fluid starts to flow, but it flows for a very short period of time and than it stops. (Take a look at the video).
Fluid level was in the middle between min and max when I tried this.
Opinions? Pete?
http://www.youtube.com/watch?v=cmi5qbBPO8E
.
I've tried what Pete suggested and it looks like ther might be a problem with the pump. As soon as I start the engine, fluid starts to flow, but it flows for a very short period of time and than it stops. (Take a look at the video).
Fluid level was in the middle between min and max when I tried this.
Opinions? Pete?
http://www.youtube.com/watch?v=cmi5qbBPO8E
.
The rotor likely cracked in half.
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,625
Likes: 1
From: Zagreb, Croatia
It looks that my luck might be getting better. I've pulled the trans pan
and found a broken filter neck. I really don't know how it happened but
it looks like because of this, pump was pulling air and maybe some fluid,
but definatelly not enough.
I only hope that this didn't cause any other problems. I'll know soon.
Also, over the time I did some research regarding my 3-4 upshift problems
and I've found that there are some modifications that can be done to
improve 3-4 shifts, so while I have the pan down, I'll try to make them.
and found a broken filter neck. I really don't know how it happened but
it looks like because of this, pump was pulling air and maybe some fluid,
but definatelly not enough.
I only hope that this didn't cause any other problems. I'll know soon.
Also, over the time I did some research regarding my 3-4 upshift problems
and I've found that there are some modifications that can be done to
improve 3-4 shifts, so while I have the pan down, I'll try to make them.
Thread Starter
Drifting
Joined: Jun 2001
Posts: 1,625
Likes: 1
From: Zagreb, Croatia
Thanks! I'm also really happy that I solved this so fast because I'm
in the middle of trying to tune my new engine (actually mseven is, not me)
and this would definately make things more complicated.
in the middle of trying to tune my new engine (actually mseven is, not me)
and this would definately make things more complicated.
