Engine shuts off when pressing on the accelerator pedal

CALICAL

MEMBER
1993 FORD EXPLORER
4.0L
6 CYL
4WD
AUTOMATIC
96,000 MILES

My SUV (listed above) touch the gas it shuts off. Unplugged the MAF and it runs but idles up and down badly and will not go into 4th gear and it's running colder than normal. I put a new MAF it fixed it for 10 miles and it started the same thing again. Any ideal what could be wrong? I also tuned it up; put new fuel pump and fuel filter and another sensor and it's still doing it.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

Just to be clear, you put another MAP sensor on it and it is still doing it? So you replace the MAP and it ran for 10 miles, broke again, replaced the MAP again, and it is still not fixed?

If that is the case, let's start with checking for codes.

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval

Next we need to check for a vacuum leak. It sounds like the fuel is not able to match the amount of air coming into the engine. So when you are idling it is able to maintain it. Once you step on the accelerator and introduce more air, it is not able to match that amount of air with the proper amount of fuel because you have unmetered air coming into the engine.

Here is a guide that will help with checking for a leak:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Let us know what questions you have and we can go from there. Thanks