1994 Toyota Previa Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1994 Toyota Previa
Verified by mechanics, reported by drivers like you
Ask a mechanic in our community
Never overpay. Check prices with our estimator
1994 Toyota Previa ProblemsFailed Emissions Test Due to Blocked EGR System
The EGR System tends to get restricted or blocked with carbon after 100,000- 125,000 miles which will cause an emissions test failure for NOX. If the EGR system is equipped with an EGR temperature sensor it will trigger a Check Engine Light for improper EGR flow. The repair is to clean out the EGR passages and the EGR Temperature sensor. Our technicians tell this repair is pretty straight forward and takes about 1-1.5 hours. It is also wise to verify the EGR system components i.e. the Transducer, EGR Valve and VSV Solenoid at this time.
A loss of power on the freeway may due to an internally leaking fuel pulsation dampener. This commonly occurs on higher mileage vehicles.
At higher mileages (125,000+) the mass air flow sensor may cause the vehicle to idle rough, run rich and even stall. It is recommended to replace the mass air flow sensor with a factory unit because the aftermarket units have very mixed results.
1994 Toyota Previa QuestionsCan oil leak into cylinders thru intake manifold? misses on start then smooths (1 answer)
out oil level in reservoir dropping. also appeared to be coolant coming out of exhaust(white smoke)replaced water pump now no loss of coolant but oil level still dropping.
I have new spark plugs, new wires, new distributor cap, new air filter, oil/filter changed. Could It be that the Throttle position sensor is worn out and affecting my timing advance and increase my HC. The NoX is below avg.
the van runn's hot if you drive the van to long