Explorer lacks power on highway
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Joined: Nov 2004
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From: Jacksonville, FL
Explorer lacks power on highway
Friend has a 1994 Explorer XLT with 3.2L V6. 135K miles.
He says that it lacks power on the highway, but only when the ambient temp is cold/cool . It also has a loud knocking sound. He says he first noticed it last winter, but it went away when summer came. Now that it's getting cool again, it's back. He can only get to about 50-55 mph out of it. The engine sounds great when not under a load, and it idles fine.
Moonen
He says that it lacks power on the highway, but only when the ambient temp is cold/cool . It also has a loud knocking sound. He says he first noticed it last winter, but it went away when summer came. Now that it's getting cool again, it's back. He can only get to about 50-55 mph out of it. The engine sounds great when not under a load, and it idles fine.
Moonen
Senior Member
Joined: Oct 2002
Posts: 7,295
Likes: 125
From: St. Louis (Out in the woods)
It's a 4.0 L V-6. Only one available on 1st generation Exploders.
Those engines were noted for intake manifold gasket leaks. I'd investigate there first for the knocking.
As for the power, I'd suggest cleaning the MAF sensor as a start. Plugged cats or a restricted exhaust also come to mind.
I'd also suggest running the EEC-IV quick test (both KOEO and KOER) to see if the PCM can self-identify any faults. This can be done with a paperclip.
Steve
Those engines were noted for intake manifold gasket leaks. I'd investigate there first for the knocking.
As for the power, I'd suggest cleaning the MAF sensor as a start. Plugged cats or a restricted exhaust also come to mind.
I'd also suggest running the EEC-IV quick test (both KOEO and KOER) to see if the PCM can self-identify any faults. This can be done with a paperclip.
Steve