Something loose? Exhaust pipe rattling/hitting on something? You'll have search it out.
you could use a turkey baster
Idle could possibly be too low.
There is a circuit breaker thaich could be bad.
where is the fuel reset swith for a 1989 mercury topaz
On the air condition COMPRESSOR is an electric CLUTCH that may be making contact and noise while the a/c is off and the engine is running...when the a/c is turned on the CLUTCH engages, and the noise goes away.....good luck:)
Clean them and see.
The rattle could be caused by loose bolts or worn suspension parts. The rear suspension should be checked to insure that no parts are close to breaking.
Only the 2.3L HSC Inline 4 will fit in the 1986 Mercury Topaz. If everything in the engine bay were gutted, perhaps something larger such as a 3.0L V6 from a 1992-1994 model MIGHT fit but it would require a complete running 92-94 Ford Tempo or Mercury Topaz with the V6 engine as a donor car (and, if you could find such a car, it would be more worth your time/money to invest in it v.s. a 1986 model). The automatic transmission from a Taurus WILL NOT WORK in a Tempo/Topaz.
There could be hundreds of different things that could rattle. Give us more details. A common rattle is from the catalytic converter. The inside breaks and pieces get into the exhaust and rattle.
What kind of 'rattle' are you trying to describe? Is it simply 'annoying?' Does the wheel itself feel 'loose?' It could be something as simple as a loose wire that runs inside the column up to loose steering linkage. If you have any doubts as to the seriousness, get it to a shop ASAP!
There are many things that it could be, but you should try checking your fuel pressure regulator. Did you replace the fuel filter first?
Have someone that you know that knows about cars check the starter cellanoid.