Since the early 80's, most production vehicles have been "detuned" to reduce emissions. In the process, compression ratios have been reduced. As a result, those engines do not NEED higher octane fuel. If you do not have a high compression performance engine you do not NEED midgrade fuel even though the auto industry has entered into agreements with oil companies to try to persuade people to use the more expensive fuels. If you have the SHO or SC engine in your Topaz (did they even put those engines in a topaz?) then perhaps the higher octane will be better for you. Otherwise, to make sure your injectors function better, use FRESH fuel, in other words, buy fuel from a place that sells it fast and is constantly buying fuel from the refinery. That's a far better defense against injector problem than any additive or special fuel blend. If you don't hear pinging in your engine you don't NEED higher octane fuel. If you DO hear pinging and the engine is stock, you probably just need to have it timed.
Most likely the timing is a little too high for low grade octane. Either go to a higher octane ( $$$$ ) or best, with a timing lite, just lower the timing till it stops knocking for the fuel that you are using.
Mercury Topaz was created in 1983.
picture of the fan relay for 1993 mercury topaz
The 1994 Mercury Topaz has a chain and not a belt.
picture on how to replace a water pump for mercury topaz
A 1991 mercury topaz has drum brakes on the rear wheels.
where is the fuel reset swith for a 1989 mercury topaz
does some one know the fireing block numbers for a 1994 mercury topaz 4
1994 mercury topaz 4cyl
there are 5 wires that go to the starter relay on a 1993 mercury topaz
I also need to know how to install a alternator in a Mercury Topaz, but my car is a 1991. PLEASE HELP...
how to set timing on 92 ford mercury topaz 2.3 engine
The wheel bearings for the Mercury Topaz are found on each axle. The average cost for a set of bearings is about 70 dollars.
where is the thermostat
I need to find out how to replace a fuel pump for a 1993 Mercury Topaz, 4 cylinder, fuel injection
What is the engine? Year? If 2.3 L and the engine knocks due to low grade fuel 87 or 89 octane, then just back off the timing. Hope this helps. This engine should run on 87 octane with no problem. If not check the advance, and pick up in the dist.
Your 1991 Mercury Topaz 2.3 liter has a timing CHAIN
The 1989 Mercury Topaz has a curb weight of 1,183 kilograms. This translates into an Imperial Weight of 2,608 pounds.
The coolant temperature sensor on a 1993 Mercury Topaz is located at the rear of the engine. To get to it, you have to remove the driver side fan.
need diagram of rear brake lines for 1993 mercury topaz
i have an 87 topaz where the alternator goes bad also. have replaced it twice. it is just a common problem in the topaz's
90" topaz mercury is getting hot and shut off and the starts when it cool off.? what is the cause of this and how do i fix it?
Sorry , no ansewer because no Topaz 1995 ; last production was 1994.
location fuel pump relay 92' merc topaz
Drain plug for what?