Q: Rough Starts & Idle

asked by on

Truck is having a hard time starting up. Once i get it started it seems to be alright. Battery is fine, starter is fine, alternator is fine. Im getting a secondary circuit failure code for my fuel pump, other than that no codes. I have noticed that at idle when i press on the gas a bit i can hear a wooshing sound of air as if the vacuum line has a leak. It has a bit of RPM variation when idling but not too bad. I also notice when i try to accelerate at times it wants to hesitate and i cant get the same torque and performance i know its capable of. Im going to search for vacuum leaks with propane enrichment today but im goping i can get some advice before dropping my gas tank to look at the fuel pump. Only other thing ive noticed is my brakes are very stiff so im wondering if its a problem with the vacuum assisted brake line.

My car has 225000 miles.
My car has an automatic transmission.

The fuel pump code for the secondary fuel circuit fault may be the fuel pump module on the cross member under the truck. The module can go bad and cause no fuel pump operation intermittently. The engine vacuum line from the brake booster connection at the motor should be checked for any loose or cracked connections at where it connects to the engine.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Rough Starts & Idle

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: What is the main reason for a random misfire on Audi A6 2002 3.0

Hello, thank you for writing in. Without the codes that are present it is hard to narrow down the possibilities for you. Coil packs and fuel supply are going to be towards the top of the list. You should start...

Q: Running lean and I can't find a vacuum leak. Sometimes vibrates at various speeds. I let off the gas and then there is a lack of power.

Hi there. For the vacuum leak, look at all of the vacuum hoses on the engine and brake booster. Check to see if the hoses are split, cracked, or unmounted. A vibration could be the engine running rough from the...

Q: How to change sparkplugs? 1997 Cadillac Eldorado

Hi there - your first move would be to carefully sketch or cellphone camera record each coil position, then removed the coil packs. Using a spray tube, hose down the spark plugs with rust penetrant (WD-40, PB Blaster or similar),...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...