Skip the auto shop - Our mechanics make house calls

Q: Difficulty starting 1992 Volvo 740 when the engine warms up

asked by on

My car has difficulty starting up when the engine is warmed up. I don't have any problems to start it when the engine is cold. But, when I drive it for a while and then park it to get something done, when I get back to continue driving it would start cranking a lot but wouldn't start. It take the car several hours to restart after that. I've done many repair on it already. I had the fuel injectors replaced; I changed the spark plugs and spark plug wires; cam shaft sensor and crank shaft sensor are replaced; I changed the distributor cap as well. The problem remained. When I start the car, there is a sound of the fuel pump under the driver's seat rotating. However, I'm not sure about the other one, as the car has two fuel pumps. What should I do?

A: The fuel pressure on your 1992 Volvo 749 sh...

The fuel pressure on your 1992 Volvo 749 should be checked to make sure it is within proper specifications. If there is a clog or malfunction in the fuel system, the car may experience a poor running situation or may be hard to start. A faulted engine coolant temperature sensor is another cause for a no start situation. When these fail, generally they do so in a manner that constantly tells the computer the engine is cold and thus causes problems on warm starts. If you would like to have this done, an expert from YourMechanic can come to your car’s location to diagnose the starting problem and let you know what needs to be done.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: car wont start

Hello, thank you for writing in. The cold weather can cause a wide variety of problems for your vehicle. You can start by testing for spark and fuel pressure to make sure the engine is receiving what it needs in...

Q: My pickup cranks but don't start and there's no power to the crank fuse

Hello. You will only get power to the crank fuse when you have the ignition switch in the crank position. You need to check to see if you are getting spark from the coil. If not, then you most likely...

Q: Car leaking oil, oil blows out of dip stick tube

If you had excessive blowby from worn rings and all, then you would have excessive smoking and oil consumption through the engine. It almost sounds like your PCV (positive crankcase ventilation) system is not feeding blowby gasses back to the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...