Top 20 1994 Toyota Previa - Page 3 Questions & Answers

Hi

Check that you have correct vacuum to booster and no leaks or lines off any where, try gravity bleeding the system . To check vacuum at booster connect the Gauge to the booster line, a reading below 16 might indicate a hose leak or obstruction, a blockage in the exhaust like a plugged catalytic converter or bad muffler or an engine problem such as head gasket or manifold vacuum leak. You need to check your vacuum with a Gauge should pull 20 to 22, if it doesn't your problem is the booster, but most probably your vacuum is low.

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remove the little cover from the combination meter and push the little button with a small screw driver its on the dash on the left side of the cluster. heres a pis to help guide you. hope this helps

Does the heater control appear to work correctly, as in it is not too loose or very tight? If it is working correctly, it is common for the heater pipes to become clogged with rust & scale on this model, due to the distance between the radiator and engine combined with lack of cooling system servicing.
If the heater control feels loose or tight, It is likely a problem with the cable controlling the heater tap. If tight, then likely the tap is faulty. If it is loose, the cable could have come off or snapped.

Maybe check for a fuse that is blown, or maybe the heater control has burnt out.
Is it a digital display one or is it just a simple fan switch?

change the heater core! pretty easy to do! buy a replacement at orileys, or autozone, etc!

Sounds like the radiator cooling fan isn't turning on, i would unplug the fan and run 2 jumper wires direct from the battery to the fan if the fan kicks on the fan is good, if it doesnt the fan needs to be replaced, if the fan checks out i would check the fan relay and make sure the relay is good, if the relay turns out to be ok then the coolant fan thermo switch is most likely the culprit for the fan not engaging when the engine reaches a certain temperature....

check fuses do u know where fuse box is it is in center of dash above heater a lil button push up and it should pop off

Your engine does not have an idle adjustment like an older vehicle would have. The idle is controlled by the PCM (computer). If you have a high idle issue, then there is a vacuum leak. The most common cause for a vacuum leak that will attribute to a high idle is a loose or broken vacuum hose. A missing vacuum cap on a vacuum port on the engine. Lift the hood and inspect all vacuum lines and ports for loose or cracked hoses's or connections. Sometimes, you can actually hear where the leak is coming from with the engine running, due to the pull of air being drawn in the leak. Also check the rubber intake boot going to the throttle body for cracks that can occur inbetween the ribbed sections of the intake boot.

looks like you have it full. it should hold between 4 and 5 quarts. your problem is elsewhere.

Dexron 3 is sufficient for this transmission

yes there is a engine core plug and its behind and inside of the bell housing,, sorry its a gear box out job to fix it,,,or you could try
"block weld!" that may stop the leak for a short time,,,

possible sway bar bushing and or sway bar links in front and worn out shocks in rear

Check for pieces of straw, paper etc in the MAF sensor. The mouse nest may have flown apart and bits are residing on thew sensor....

Here is a firing order diagram to help assist you.

If you have 150k or more, you probably need a water pump, which is under the seat next to the sliding door. You may not be able to hear it going bad, due to location. I would also switch to 20w50 motor oil. If you live in a high altitude area, it is definitely the water pump. I have two of these, with a combined total of 900k.

This could be a grounding problem. Check all battery connections. Also check motor to body ground strap for corrosion. Check battery to motor ground and battery to body ground. Even if the ground looks allright it can be corroder underneath, so you have to take the ground bolt off to clean it.

The speed sensor on the transmission maybe bad, replace it and see if that is the problem.I had the same problem with my previa and replaced it and it worked great!

fan doesnt come on ????
thermostat upside down ?

bad temp sensor for fan

Lucky you... we all dream of that day!

Why fix a gift of that ... you've got angels!

Suggestion:
1. Change oil every 3 months
2. If you really want to fix it... check the line, load with graphite as per manual.

Best

Change fuel filter, air filter and if that doesnt help check fuel pump pressure.