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2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 02-12-2010
Brandon77's Avatar
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Running rough

My truck is running rough, shaking slightly at idle and hesitating when accelerating. I thought it might be bad gas or something, but having gone through a couple tanks and adding some Heet it didn't help. Then I changed the spark plugs thinking that might do the trick but it didn't help either. Any other ideas?
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Old 02-12-2010
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had something similar and it turned out to be dry rotted spark plug wires that look good but when bent would snap in half.
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Old 02-12-2010
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hesitating when accelerating might be caused by a bad TPS
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Old 02-12-2010
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Highly unlikely a bad TPS, in OBDII, it has several reference points for voltage (KOEO, idle, 30 MPH, 60 MPH, etc), if it is not within the very tight tolerances (We are talking usually an acceptable range of .050v) it will trip a Circuit Malfunction DTC.

Given the carbon-harvesting nature of the 3.0, I would recommend removing the intake manifold, cleaning it by hand, remove the EGR valve sampling tube, cleaning it by hand, remove the IAC, cleaning it by hand and then finish it all off with a nice dosing of Seafoam.
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Old 02-15-2010
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Quote:
Originally Posted by 84FordMan View Post
Highly unlikely a bad TPS, in OBDII, it has several reference points for voltage (KOEO, idle, 30 MPH, 60 MPH, etc), if it is not within the very tight tolerances (We are talking usually an acceptable range of .050v) it will trip a Circuit Malfunction DTC.

Given the carbon-harvesting nature of the 3.0, I would recommend removing the intake manifold, cleaning it by hand, remove the EGR valve sampling tube, cleaning it by hand, remove the IAC, cleaning it by hand and then finish it all off with a nice dosing of Seafoam.
Thanks. I will get to it as soon as I figure out how, haha. Anyone have a repair manual PDF?
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