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Ricky Posted on Aug 09, 2017
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98 ford explorer will not accel after going into passing gear

When running at a normal speed and you floor it to pass someone, it drops into passing gear, but it will not pick up speed. You have to let the accelerator before it will change back into overdrive. When driving along normally, it changes pefectly. Have replaced EGR valve, TPS senor, new fuel pump, new fuel filter, new plugs and wires, mass air flow sensor, idle speed sensor, etc. Any ideas?

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Marvin

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  • Ford Master 85,242 Answers
  • Posted on Aug 09, 2017
Marvin
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And what fault codes prompted you to replace these parts you listed? You never mention fuel pressure readings under a load, how about excessive exhaust system back pressure? Has the transmission been scanned for fault codes?

5 Related Answers

Jordan Waldrop

  • 147 Answers
  • Posted on Aug 15, 2009

SOURCE: Repalced O2 sensors, mass air flow sensor, and plugs error messag

dpfe velve

small emissions valve with one electrical connnector and three to four vacume lines located near your egr valve. this is a comon fault on fords emmissions system.

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Anonymous

  • 6 Answers
  • Posted on Oct 15, 2008

SOURCE: 2000 ford explorer 4.0 x-engine is stalling, missing and lose power while driving

Exhaust might be stopped up. Check the catalytic converter and or muffler.
Good luck!

Anonymous

  • 393 Answers
  • Posted on Nov 16, 2008

SOURCE: bogs when accelerating from an idle, rough starts.

listen for a vaccum leak.also try disconecting bat for 5 min the reconnect and start truck and hold idle at 1500-2000 for 5 min. this resets and teaches computer to self adjust

motor1258

Mike Butler

  • 6674 Answers
  • Posted on Oct 12, 2009

SOURCE: MY 98 FORD WINDSTAR STALLS WHEN I IDLE OR COMING

I'd be looking at removing IAC valve, and cleaning it out with throttle body spray cleaner, and checking mounting gasket as well. Usually some success with cleaning it & spray ports it came out of, but if not you may need to replace it.

Anonymous

  • 3489 Answers
  • Posted on Dec 19, 2009

SOURCE: 1997 Mustang Cobra (4V, 4.6L), rough idling, won't stay running

silly question, however did you check the air box for nests. it is not uncommon for rodents to climb in and make themselves at home. i would also say to get a maf from ford. check ALL around the engine compartment and underneath for evidence of rodents and their leavings. youll be very suprised what you may find.cheers

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98 tahoe with 4 wheel drive, It will shift fine when I dont step on it but when I do it dont. also when I try to pass it seems to drop down more than one gear and revs high r's. If I am going more...

You may have a partially plugged fuel filter or a weak fuel pump causing your problems. When you slowly build up speed to, say, 65 mph, it doesn't take a lot of fuel all at once to get to that speed but if you try to accelerate more quickly to that same speed you essentially run out of fuel which will cause the engine to bog...which then causes the transmission to downshift one or more gears...which then will allow the engine to speed up considerably but you won't really gain all that much speed. Same goes for passing someone: If you ease into it you will be using the fuel that's available more efficiently but if you step on it then you have way more air than fuel entering the engine and it just won't hardly go much faster until the fuel supply catches back up again. The quickest way to figure out what is happening is to have someone test the actual fuel pressure during a test drive to see if the pressure remains normal or falls off as the problem occurs. If the fuel pressure does fall then I always change the fuel filter first and test it again. If the pressure is normal and the problem is gone then you've found the culprit. If the pressure is still low then you most likely have a weak fuel pump. A restricted catalytic converter can also cause similar problems but is much more rare. Good luck, hope this helps!
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98 Ford Explorer engine/exhaust noise

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But you can just unbolt it, break up the loose chunks, pour out the pieces, and it will run better than ever.
If you don't pass the next emissions test, then replace it.

But it could just be the heat shield rattling instead.
Take the shield off first, to see if it goes away.
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I HAVE A 2006 FORD RANGER LEVEL 2 4X4....when giving it gas in neutral or park the motor jars around 3,000 rpms and won't go higher? when driving it works fine and passing gear works fine too...just when i...

Funny....thats a safety feature ford now uses. Keeps you from blowing the engine and no you cant by pass it. So yes its natural. But nice to know that someone still trys to feed some speed.....
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