Question about Cars & Trucks
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Posted on Jan 02, 2017
Answer these questions to determine power loss while driving:
1. Do you hear any pinging or knocking? A bent rod will cause loss of power. ( should be able to hear wihtout strain)
2. Have you changed the fuel filter/airl filter recently? A plugged (dirty) fuel filter will cause this, as well as a plugged (dirty) air filter. Change both if needed.
3. Injected? On a full tank run one can of SeaFoam in the tank - first, pull vacuum lines and run through lines for about 20 seconds (will have to put hose in can, and manually rev the engine to keep from dying). Pour rest of contents into tank (full tank) and drive.
4. If you use Pemium fuel, use up what you can (if possible) and switch to regular (or vise versa). Some vehicles don't run well, if at all with Premium fuel.
5. Upon changing fuel filter, make sure all air lines, fuel lines and vacuum lines are not kinked, or have holes in them.
6. If none of the above make a difference, start the truck and locate the MAS (mass air flow sensor) which is between the intake and the air filter. (black); lightly tap on the top of the MAS with a screwdriver handle or a wrench. If the truck stalls (hesitates, stutters) or dies, then it needs replaced. Before replacing however, go to the local parts dealer and purchase a can of MAS cleaner. It is safe for sensors and will clean the sensor inside (honey come inside like a catalytic converter).
Sometimes the MAS is dirty and the sensor isn't able to read the air intake causing it to mix the air and fuel incorrectly. This is a cheap and affective fix for the problem you're having.
If this does not work, try first options above, and this should cure the issue. If not, you may have a timing issue. If you have access to, or own a timing light, use it to determie timing placement is correct. Also, make sure that two of the spark plug wires have not been misplaced. Though it idles fine it will not make too much of a difference at idle but will while driving. I've experienced this first and, and thus I mention it.
Please let me know if you need any further assistance. Here is a tip to get you started. Check with your local parts dealer and find out what the cheapest fix is, and work your way up. 99% of the time it's the simplist components that cause the biggest issues.
Guru, Premium Expert @ Fixya
Posted on Apr 10, 2010
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