Skip the auto shop - Our mechanics make house calls

Q: Sporadic starting issues - 1990 Dodge Dynasty

asked by on

I have sporadic starting problems with the car. Once it does start, it has no problems at all and runs great without hesitating or losing power. However, when I cannot get it to run, it usually starts up, runs rough for about 20 seconds and shuts off. The fuel pressure seems fine and there is spark. I had the fuel pump replaced along with the fuel filter. The dashboard isn't showing any lights on. What might be the problem?

A: This problem sounds like the fuel pressure ...

This problem sounds like the fuel pressure check valve, which maintains some fuel system pressure overnight, is leaking down and sticking "open" when the car is first started each day. Once the vehicle has started, with adequate pressure built up in the fuel system, it doesn’t leak down enough during the day to cause a problem. Monitoring fuel pressure during a "first time each day" startup scenario will confirm this cause. A professional mechanic, like YourMechanic, can check out this problem, and replace any failed parts.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Starts for a second, dies, and won't start again unless you disconnect battery.

Hi there. The symptoms that you are having seems to be with a faulty PCM (powertrain control module, computer). If you are able to reset the computer by disconnecting the battery, then restart the vehicle, there is an issue with...

Q: Fuel is not returning to the tank and there is too much pressure on the feeding line.

The only things that are likely to cause fuel not to return are either a failed fuel pressure regulator, or an obstruction in the fuel rail. Even though you recently replaced the fuel pressure regulator, my guess is that it's...

Q: how much does it cost to change an alternator

Hi there. Quotes cannot be given through the ask a mechanic portal. I can provide you a link to schedule the alternator replacement. Your request has been forwarded to customer service. Please have your vehicle make, model, mileage, and VIN...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...