shudder?............. this cant be fixed - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 08-16-2007
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shudder?............. this cant be fixed

a shudder at 1500-2200 RPMs............... wont start till 2nd or 3rd try. will start after if you try and start it right after you turn it off. However leave it for an hour it wont start the first few times you try. At a dead stop if you gunn it it hesitates and shudders, then goes fine. Anything you think could be the problem plese let me know. Replaced MAFS, IAC, Checked for vac leaks, checked fule pump and filter, checked injectors, replace computer, cleaned air filter, reprogramed three times at Ford. The shop had it for 2 weeks............ ANYTHING that you think it could be plz let me know to steer the mech in the direction. Oh the only thing the test tool says is the the berometic pressure is reading 1.2Ghz and it is low. I have no idea what that means but thats what the mech told me. Thanks, this has been a 7 month ordeal and has cost me time effort and about 2grand thus far. It used to not even be driveable until all above was replaced
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Old 08-16-2007
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Your 2001 does not have a barometric pressure sensor or a manifold absolute pressure sensor, so I don't know where the the 1.2 GHz BP value is coming from.

If it starts on the second or third try, that is often a symptom of a tired fuel pump or a bad check valve at the fuel pump. You can check it out yourself with a simple test:
Tomorrow, with a cold engine, turn the key to ON without trying to start the engine. Leave it in the ON position for three full seconds, then turn it OFF.

Repeat the above step 3 more times.

Now try to start the engine. If it starts immediately after the above procedure, it means that the fuel system is coming up to pressure too slowly to support a quick start. It could be your pump is tired or that the check valve is not working. Either problem should be repairable by replacing the intank pump/sender unit.

If the test does not help, then you will need to look elsewhere.
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Old 08-16-2007
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what would acount for the rest of the problems?
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Old 08-16-2007
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The only other problem I see in your post is the hesitation/shudder. I suppose that could be fuel delivery related as well. I'd try the test - it's free.
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Old 08-16-2007
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k, tried the test and it didnt start. I tried cranking it for 10 seconds and all I could get it to do was sound like a harley and eventually stall. Then the next time it started right up.
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