95 5.8 problem

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Feb 18, 2009 | 04:24 PM

aluminumpuppy

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95 5.8 problem

Hello all you smart people that are going to save me from my problem!!

I have a 95 F150 with a 5.8 and E40D 183,000 miles,
It has a hesitation during acceleration right around 1000 rpm, just kinda sputters a little then takes off. it does it every time and has done it ever since I bought it 3 months ago. Idles great, and runs great once it's past that spot... The check engine light is not on and there are no codes stored in the computer.....

So far I have replaced the O2, Throttle Position and EGR sensors, Cap, rotor, plugs, wires, IAC solenoid, Fuel Filter, Air Filter and double checked the ignition timing.

What can it be????

Feb 18, 2009 | 05:03 PM

1994 F250: 351, C6

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Have you checked for Vacuum leaks? Also, a bad ignition coil can cause hesitation upon throttle application.

Feb 18, 2009 | 05:20 PM

aluminumpuppy

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Thank you,
I'll check it out after work, what's a good way to check for vacuum leaks? I can't hear any when it's running..

Feb 18, 2009 | 05:30 PM

1994 F250: 351, C6

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Checking for vacuum leaks sucks, there is no easy way to do it. If you have access to a vacuum gauge, that makes things easier. Start by checking all of the connections and looking for broken/rotted out lines. If that does not find a problem you can disconnect vacuum fittings and feel for vacuum with your finger.

Inspect the white line that goes from the resivor to the heater vent control up by the firewall on the passenger side. The heater hoses rest on top of this line and a loom of wires and other lines and the heat causes them to rot out. This happened to my truck and it would hesitate on acceleration but the heater controls still worked until I found the problem and touched the line causing it to totally fall apart. To protect this line and the other lines and wires under the heater hose, I cut a length of 5/8" heater hose open line a hotdog bun and put it around the lines and wires and secured it with a hose clamp on each end. Good luck.

If a vacuum leak is not the culprit, consider buying a new coil, they are cheap and frequently cause the problem you are describing.

Feb 18, 2009 | 05:36 PM

blakem_85

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Quote:

Originally Posted by aluminumpuppy

Thank you,
I'll check it out after work, what's a good way to check for vacuum leaks? I can't hear any when it's running..

The best way to check for a leak is with a vacuum gauge. Another method to check for leaks or to find the leak is to use an unlit propane torch, carb cleaner, starting fluid, or something similar and run over all of your vacuum lines with the engine running, if the idle speed increases then you've found your leak. A common place for leaks on these engines is around the pcv valve at the rear of the intake.