1994 Ford Explorer no acceleration

GMONAHAN

MEMBER
1994 FORD EXPLORER
6 CYL
4WD
AUTOMATIC
200,000 MILES

The engine starts & idles fine. When the accelerator is depressed, the engine 'bogs down' - even under no load. If you 'pump' the accelerator quickly, engine speed can go to about 3000 RPM.
i installed new wires, and a new air filter. Plugs are less than a year old. This problem has gotten progressively worse.

i'm thinking a vacuum leak.

your thoughts?

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,772 POSTS

Have you checked fuel pump pressure? Also, have you checked to make sure the catalytic converter isn't plugged? And yes, a major vacuum leak could cause it too. Have you checked it? Let me know if the check engine light is on too.

Joe

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Monday, August 2nd, 2010 AT 11:21 PM

GMONAHAN

MEMBER
3 POSTS

Check engine light is not on now, but when the car ran better, it used to come on after about 10 minutes.

My son had this car for the last 9 months, so i'm a little sketch on what the exact sequence of events are.

RE: catalytic converter - - there appears to be plent of exhaust pressure. Is there an easy way to check?

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Tuesday, August 3rd, 2010 AT 8:20 AM

JACOBANDNICKOLAS

MECHANIC
109,772 POSTS

Check to see if is glowing red hot after running the vehicle for awhile. Also, you can check back pressure by removing the O2 sensor and checking it there.

Have you checked fuel pump pressure? Also, have you tried having the computer scanned for codes since the light was on? Most parts stores will do it for free.

Let me know.

Joe

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Tuesday, August 3rd, 2010 AT 11:08 PM