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Witch vacuum port dose the trans line hook up to for the kick down on a turbo 400

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  • Cars & Trucks Expert
  • 243 Answers

Should draw direct vac through intake (constant vacuum)

Posted on Apr 19, 2015

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Posted on Jan 02, 2017

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johnny5846
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SOURCE: 89 chevy 2500 silverado

that was old school , vehicles with the turbo 400 transmission are equipped with an ECM controlled downshift system , when vehicle is at speeds below 70 mph a forced (detent) downshift is possible by fully depressing the accelerator ,when the ECM detects a drop in manifold vacuum (high map sensor reading) the downshift control relay is energized by the ECM , the relay detects battery voltage to the detent solenoid in the transmission to open open an oriface to force the transmission to downshift ..... if yours is not working i would first check the downshift relay , under hood , picture is so bad i can't tell , looks like on the firewall more to the passenger side , next to fuel pump relay , if it needs more diag than that maybe you should get an estimate for repair from a trans shop or such , hope ya fix it , cheers .

Posted on Jan 09, 2009

  • 60 Answers

SOURCE: looking for 1995 volvo 850 turbo vacuum line schematic diagram

This is for a 98 T5, but it should be close enough. http://www.matthewsvolvosite.com/forums/viewtopic.php?p=93956#p93956

Posted on Oct 20, 2009

ZJLimited
  • 17970 Answers

SOURCE: is there a diagram that shows how the vacuum lines hook

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Vacuum hose routing-1989 2.5L California Turbo I engine


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Vacuum hose routing-1990-91 2.2L and 2.5L Federal engines with manual transaxles, and 2.2L and 2.5L Canadian and California engines


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Vacuum hose routing-1990-91 2.5L Turbo I California engines


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Vacuum hose routing-1990-91 2.5L Turbo I Federal and Canadian engines

Hope helped with this information (remember rated this help) Good luck.

Posted on Nov 10, 2009

  • 2002 Answers

SOURCE: I have A 1985 Pontiac Trans Am with A 5.0L E4ME

You need to hook the vacuum advance for the distributor to the front lower left on the carb. The PCV valve goes in the center bottom front. The dashpot for the choke goes upper left front. The vacuum to the brake booster goes in the lower middle at the rear. If you have a second vacuum pot on the rear on the choke side it needs vacuum from the front. The transmission vacuum usually hooks to the rear on the intake. This is all you need. The rest of the ports on the carb and intake can be plugged. Hope this helps.

Posted on May 19, 2010

  • 6982 Answers

SOURCE: 1973 chevy truck vacuum diagram

Pretty sure I have the diagrams etc but they are buried away and would take a week to find.
BUT: The setup on that engine for that year is fairly uncomplicated and you could pretty much do away with all the emission controls etc and get the engine running really well. (just block off all vacuum ports on the manifold and carb except for the one to the transmission and power brake booster) I'm not really familiar with the edelbrock carb (looks like they are based on the old carter AFB carb though. I am partial to holley carbs, and the old quadrajet carbs)
What you need to check first though is your fuel pressure and delivery. You should be seeing 5-7 psi at the carb. With the fuel line disconnected, and attached to a rubber hose diverted into a container, you should see at least a gallon of fuel pumped at idle before the carb runs out of fuel. Make sure you don't have any leaks in the fuel line coming from the tank...with a pull type pump (mechanical pump on the engine) a leak often will not drip, but will allow air to be drawn into the line while running. Make sure that if your carb has a filter in the fuel inlet, it is clean. Make sure that the fuel line filter (sock) in the tank is also clean.
It's likely you have an egr valve on the manifold, If so, you can temporarily block it off with a small piece of metal from a soda can installed between the valve and the manifold. That will prevent it from working and if it has any leaks, blocking it off will eliminate it from the system. If that helps, replace the valve.
Your ignition system is fairly simple. a single 12 volt lead goes to the battery side of the distributor. You can block off the vacuum advance temporarily and just set the initial timing at about 8 degrees advanced. (depending upon fuel quality, you can go as high as 12) . The ignition module is not "testable" usually though they either work or they don't )
You do need to check the wires that attach to the pickup under the mount plate to make sure they are not partially broken and grounding when the advance moves the plate.
Back to your carburetor... If you are test driving without the air cleaner housing in place, it is possible that if there is a heat pad mounted to the underside of the hood, it can get drawn down against the carb inlet and cause problems. If the air cleaner housing is in place, make sure that the inlet door in the snorkel is opening or, disconnect the vacuum hose going to it as default on those is wide open. If you have tried everything I've outlined, you may have to go inside the carb and make sure that the power valve isn't frozen or that the float level isn't set too low.
Once you get it running right, you can begin to look for the diagrams etc you are looking for, but at least it will be running and usable.
The only other item that could give you a problem like the one you have is if the cam timing was set incorrectly at the factory (doubtful but it can happen) but I really would not worry about that just yet.
Hope something here helps!!! Good luck!

Posted on Aug 01, 2010

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1 Answer

I put a turbo 400 n my 1988gmc truck now I don't have any power it's like it go a rev limiter on it but it don't and it dose good n park


Check the vacuum port from intake to make sure its getting vacuum if it is it sound like it could be the shift module which isnt allowing the gears to shift proper

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How to hook up a kick down cable on a turbo 350 with a 5.7 350chevy properly


The turbo 350 ,,,,uses vacuum and a cable,,,to kick down,,, just run a vac line from intake to the regulator on back of the trans,,,pull the cable out as far as it will go,, hold your throddle wide open,,, will get you close,,, you may have to make a bracket to the kickdown in the proper place,,,

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Trans will not shift i have to let off the gas to get it to shift is the relay bad and were is it


Which transmission? My 87 with a Turbo 400 uses a vacuum modulator. In that case it's a vacuum line or the modulator that's the problem. The modulator is a little "mushroom" on the passenger side of the ******. Pretty obvious with a vacuum line going to it.

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Car wont start has power steering fluid in mufflar


That's most likely transmission fluid because the diaphragm on your trans that changes the shift point, the vacuum line hooked to the carb is sucking trans fluid right into the engine and now it's fouled the plugs and won't start. Change the plugs, unhook the vacuum line to the tranny, plug the vacuum port and re-start the engine. You know now you have to replace the vacuum unit on the trans.

Dec 29, 2010 | 2006 AMC CJ7

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Newer tranny older truck


The cable on the 90 Suburban is not a kick-down cable, it is a TV cable (Throttle Valve) cable and it controls the amount of fluid line pressure through the transmission according to the throttle position, and if it is not properly adjusted the transmission will have shifting problems and it will lead to early failure of the transmission.

The electrical connection on the side of the transmission is for the electrical solenoids inside of the transmission that the computer uses to monitor and control the shifting and the kick-down.

The best thing for that truck would be a good Turbo 400 transmission.

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1 Answer

I have A 1985 Pontiac Trans Am with A 5.0L E4ME carbonated engine and I had to remove all the vacuum line's and I need to get A diagram to hook it all up again. Or since I don't need to pass any emission...


You need to hook the vacuum advance for the distributor to the front lower left on the carb. The PCV valve goes in the center bottom front. The dashpot for the choke goes upper left front. The vacuum to the brake booster goes in the lower middle at the rear. If you have a second vacuum pot on the rear on the choke side it needs vacuum from the front. The transmission vacuum usually hooks to the rear on the intake. This is all you need. The rest of the ports on the carb and intake can be plugged. Hope this helps.

May 19, 2010 | 1985 Pontiac Firebird

1 Answer

Vacuum line on top of my 4l60


some trannys have a hard line that comes out on top of trans. all your old 350's and 400 turbos had them, thats just a breather tube for trans., it don't hook to anything. just a breather. i believe thats what your talking about.

Feb 02, 2009 | 2000 Chevrolet S-10

1 Answer

89 chevy 2500 silverado


that was old school , vehicles with the turbo 400 transmission are equipped with an ECM controlled downshift system , when vehicle is at speeds below 70 mph a forced (detent) downshift is possible by fully depressing the accelerator ,when the ECM detects a drop in manifold vacuum (high map sensor reading) the downshift control relay is energized by the ECM , the relay detects battery voltage to the detent solenoid in the transmission to open open an oriface to force the transmission to downshift ..... if yours is not working i would first check the downshift relay , under hood , picture is so bad i can't tell , looks like on the firewall more to the passenger side , next to fuel pump relay , if it needs more diag than that maybe you should get an estimate for repair from a trans shop or such , hope ya fix it , cheers .

Jan 09, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

I have a 1978 chevy k20 4x4 truck. Lately my transmission will not shift to third gear, and if it does, it shift back down to second gear.


On the back right side of the tranny you will find the modulator valve with a vaccum line. First check the the line is ok, if so, replace the valve. Note; there is an adjusting screw inside the vaccum hose fitting to change the shift modes. Don't mess with it unless necessary! Frankster016

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Where is the transmission modulator located on a 1989 chevy k1500


If it has TH400 Transmission, its mounted L/H rear just above pan.
Looks about 2" Dia with hose in centre.

Jul 31, 2008 | 1999 Chevrolet Silverado 1500

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