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Scott W.
Scott W., Ford Technician
Category: Ford
Satisfied Customers: 3288
Experience:  28 yrs. experience as Ford ASE Master Technician. Accolades include being a 2005 Ford PTS Regional Finalist and 2006 ASE Ford National Technician.
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Ok i have 1998 ford f150 and i have a new exhaust job on it

Customer Question

Ok i have 1998 ford f150 and i have a new exhaust job on it plugs, plug wires coil packs, egr vavle, pcv vavle throttle postion sensor, fuel filter and air filter still running rough what else is wrong with it
Submitted: 8 months ago.
Category: Ford
Expert:  Scott W. replied 8 months ago.

Hello my name is ***** ***** engine do you have?

Customer: replied 8 months ago.
4. 6
Expert:  Scott W. replied 8 months ago.

Is there any codes stored, misfire codes? Does it feel like a dead miss or really rough idle?

Customer: replied 8 months ago.
The last time i codes tested it it pulled a few of them bank 1 bank 2 lean combustion egr vale and im pretty sure i fixed those with the new exhaust system and parts and it just runs rough many when its in gear loses power
Expert:  Scott W. replied 8 months ago.

Have you checked the fuel pressure when it loses power?

Customer: replied 8 months ago.
Havent tested it other than when its running i hit the fuel thang on the motor and it shots fuel out of it
Expert:  Scott W. replied 8 months ago.

Ok I would get a fuel pressure gauge and put on it to make sure it isn't running out of fuel volume.

Expert:  Scott W. replied 8 months ago.

Does it idle ok?

Customer: replied 8 months ago.
Maybe a a fuel pump
Expert:  Scott W. replied 8 months ago.

If the pressure goes low under accel with a load on the engine, yes the fuel pump could be failing.

Customer: replied 8 months ago.
What if it passes got got the test kit heading to test it now but if it passes what else could it be
Expert:  Scott W. replied 8 months ago.

I will give some possible causes for lack of power, give me a few minutes.

Expert:  Scott W. replied 8 months ago.

Here is our test for lacking power and items to check.

Expert:  Scott W. replied 8 months ago.

You might do a compression test also to make sure the base engine is ok, valves, springs, piston rings. You should have around 150 psi.