Q: cold start problum. after started though it well start back up if not sitting more then few hours.

asked by on

well not start after sitting 3-4 hours, but after spraying starter fluid in the in the filter chamber it starts up, and can shut it off for 20-min's and restart it with out a problem, it only has problem starting after it has sit for some hours. battery good. have engine codes: p1000 oxygen sensor, c1095 drive cycle test not complete, and it said something about hydraulic pump motor circuit malfunction. has something to deal with a fuel problem, but don't know what.

My car has 117 miles.
My car has an automatic transmission.

The fuel system needs to keep the fuel pressure in the injection system after you shut off the car in order for the vehicle to start back up without waiting for the fuel system to pressurize again.

There are three possible problems. The fuel pump inlet check valve built into the fuel pump is not holding pressure and allowing the fuel pressure to bleed back to the tank after you shut off the car. The next possibility is that the fuel pressure regulator is not holding pressure on the return side of the fuel system and is leaking. Lastly, one of the injectors is may not be sealing properly and leaking pressure.

A mechanic will need to test and isolate the fuel system to see if the regulator or fuel pump is bad. An injector may also be at fault which would require a repair.

You can try cycling the key on and off, four or five times slowly, and then try to start the car. This will help build enough fuel pressure to start it cold until you get it fixed.

If you decide to get this fixed, consider enlisting a professional mechanic who can diagnose your starting problem firsthand and fix it accordingly. Good luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. cold start problum. after started though it well start back up if not sitting more then few hours.

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: Converting

The body for these two models are different. The mounting locations for the the front header panel is going to be different on each one. You can try, but I do not think the parts will be interchangeable.

Q: Service engine soon notification

If the light is on then you have set a code in the computer. The tester you got may not be able to read the code. I suggest you have the code tested to see what it is with someone...

Q: Brake fluid leak

Hello. Brake hoses tend to leak only when they are cut by some sort of road debris. The brake hose has several layers on it because of the safety factor involved with brakes. It is possible for the line to...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...