97 5spd jerking on accel - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 08-12-2014
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97 5spd jerking on accel

Hello all. I just had a couple questions. My 4x4 ranger is jerking around a lot upon acceleration. The cel code says bank 1 and 2 lean. When I unplug the sensors it runs exactly the same. I would assume that would mean my two sensors are completely shot, and it's always running on open loop, but I'm not sure. It used to only jerk sometimes, now it's always. I've put new u joints (they were shot) and a new clutch and slave cylinder (also shot). Could bad 02 sensors cause a problem like this? I'm sure the truck could use plugs and wires and a coil and a cleaned MAF too since it has 218000 on it. Any help would be appreciated, thanks.
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Old 08-13-2014
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Mileage, as in how many miles are on this engine? What, if any prior maintenance has been done to the engine in the way of a tune up (i.e. plugs, wires)?

Jerking or hesitation because of a lean mixture can be several things. Have you checked the fuel pressure at the injector rails? This check can rule out the fuel pump and dirty fuel filter as a possibility. Plugs good? Gap look good? Plug wire condition? While the plugs or plug wires don't cause a lean condition code to be set, they can cause a jerking or hesitation on eccelerating.

If the O2 senors are the original ones, they are most likely dead, so replacing them could be in order.
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Old 08-13-2014
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Engine has 218000 on it, I havent checked fuel pressure but its got a new pump and filter as of last year. Plugs and wires could be the culprit, havent been done in a long time. The cel says bad o2 sensors, but could that really cause it to run like that? When I unplug them it runs tge same
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Old 08-13-2014
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Also on top of what bucko said, make sure you check for vacuum leaks, the 4.0L OHV are known for having the upper intake gasket leak.
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Old 08-14-2014
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Quote:
Originally Posted by Khustle View Post
Engine has 218000 on it, I havent checked fuel pressure but its got a new pump and filter as of last year. Plugs and wires could be the culprit, havent been done in a long time. The cel says bad o2 sensors, but could that really cause it to run like that? When I unplug them it runs tge same
the 1st thing i would do is , replace both O2 sensors , and run a can of seafoam mixed in with the fuel

make sure that you run a full tank of high grade good quality fuel as seafoam dilutes a fuels octane level

you just might have some nearly plugged up fuel injectors
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