Transmission Leak

2288 Views 22 Replies 4 Participants Last post by Moparian1997, Jun 2, 2020

bigtony

Discussion Starter · Jul 19, 2014

After dropping the transmission and doing a seal kit, (OEM) from the dealer it's still leaking at the engine. Any ideas why? It only leaks when I drive and the faster I go the more it seems to leak, to the point of smoking at about 70 mph if I keep it at 60 mph no smoke.
Was reading many threads and seen something mentioned about a pressure sensor and solenoid? Could this cause more pressure at the TQ seal and make it leak?

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bigtony

Discussion Starter · #21 · Jul 27, 2014

ramvan2500 said:
It is certainly vacuum related. I would start off by checking vacuum lines for any leaks, including rubber connectors. If all that checks out I would look into the vacuum reservoir, as it might be filled with water from moisture which present in the air. This waster build up in the reservoir would reduce the capacity of the reservoir during times vacuum are low (such as hard acceleration or climbing up hill). In addition I would check the reservoir for leaks and cracks.

That's the canister located on the passenger side frame correct? I hear it pulsing while the engine is running, one round and one square around the back corner of the cab of the truck. I'll check that out. I also think there is an electronic solenoid hooked to the box/canister on the passenger side tire well under the hood because I've been tracking down vacuum lines since I got the truck, inspecting lines also. I've got a few around the transfer case that will need attention eventually, oil/fluid leaks play hell on them. Was wondering if the control on the dash could be worn out, it gets used all seasons and I believe it has multiple vacuum going to it, just a thought.

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ramvan2500

· #22 · Jul 27, 2014

bigtony said:
That's the canister located on the passenger side frame correct? I hear it pulsing while the engine is running, one round and one square around the back corner of the cab of the truck. I'll check that out. I also think there is an electronic solenoid hooked to the box/canister on the passenger side tire well under the hood because I've been tracking down vacuum lines since I got the truck, inspecting lines also. I've got a few around the transfer case that will need attention eventually, oil/fluid leaks play hell on them. Was wondering if the control on the dash could be worn out, it gets used all seasons and I believe it has multiple vacuum going to it, just a thought.

The canister with the solenoid is the EVAP canister. This EVAP canister contains active charcoal which absorbs evaporate fuel out of the gas tank, when the vehicle is driving it periodically sends signal to the solenoid which in turn allows the engine to pull the vapor from the canister.

It could be an issue under the dash, it could be a check valve under the hood (highly likely), and it could just be a vacuum reservoir. I would just grab a hand vacuum pump (handy pump) and just test every little check valve and the vacuum control valves. I would however drain the reservoir when you find it, I can promise you that water will come out. Mine had about 8oz of water in it.

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Moparian1997

· #23 · Jun 2, 2020

I'm having the same problem with my truck this is my 3rd trans and some times it leaks more than others if I put it under a load or just drive it all day. It does the smoking thing. If I put it in reverse it pours out the front of trans. I've replaced seal twice and same problem. Please help too

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