I notice some hesitation from the engine every time I drive my Dodge Dynasty. I hear stumbling noises, and the engine runs really rough during warm-up. Sometimes while driving, I also notice poor acceleration. What should I do to fix this?
A common issue of Dodge Dynasty vehicles from 1990 to 1993 is a clogged exhaust gas recirculation (EGR) back pressure tube. Often, it does not affect engine performance; however, in your case, it is possible that the system has become too clogged to the point that it has become inoperative. Some of the signs you mentioned—hesitation, poor acceleration, and rough running—only happen once NOx and hydrocarbon emissions in the exhaust have elevated to unhealthy levels. Your EGR system is supposed to reduce these emissions, so if the amount of emissions is already affecting engine performance, then it is likely that the system has started breaking down. It may also have excessive backpressure, which is why the valves are recycling too much exhaust gas, causing the aforementioned symptoms.
I bought a restored and upgraded Dodge Dynasty, and everything was going well until I noticed that it consumes more oil than usual, exceeding one quart per 750 miles. How can I fix this? Any tips to improve its fuel economy?
Several mechanical problems can affect your vehicle's fuel economy, so it might be difficult to pinpoint the exact cause without close inspection. However, for this vehicle, the first part you might want to check is the valve guide. A worn valve guide causing poor fuel economy is a common issue among Dodge Dynasty models from 1990-1993. You only have to realign or replace the existing valve guides to fix the issue. If this does not solve the problem, you can inspect if the vacuum advance unit is still working. This is also an issue that is common in old cars like the Dynasty. Inspect the engine for other possible causes that include a worn timing belt, a poorly adjusted carburetor choke, clogged PCV valve, or too much exhaust backpressure from a clogged catalytic converter, muffler, or pipe. Sometimes, the transmission may also cause issues in fuel economy due to low fluid levels, excessive oil viscosity, bad bearings, or failure to engage one or more gears.
How often should I replace the timing belt of my Dodge Dynasty?
The recommended timing belt replacement interval is between 60,000 and 106,000 miles. However, if you live in an area with a hot climate, it is advised that you replace the Dynasty's timing belt every 60,000 miles as it is more prone to breaking due to its exposure to excessive heat. However, you might have to change the timing belt earlier if you notice any of the following symptoms: hesitation when you rev up the engine from 2000 to 4000 RPM, difficulty in starting the engine, and emission of too much smoke from your exhaust. In any case, it is more economical to replace the timing belt than to wait until it breaks and causes further damage to other engine parts.