Contour Enthusiasts Group Archives Forums General Troubleshooting Secondaries question

Originally posted by pctour:

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Thanks, the odd thing is they seem to work ok while driving the car, I don't have any hesitation while at that rpm or higher.

On a side note I'm one of the many on here chasing the low end hesitation. Would it be of any benefit for me to remove/clean the fuel pump screen? I have already changed coil pack, wires, plugs twice, fuel filter, UIM/LIM cleaning, would that or the throttle position sensor, IMRC, MAF, etc. be the next thing to try? By the way I have no CELs and the hesitation is the same no matter the amount of fuel in the tank. This hesitation is EXTREMELY frustrating and I've been battling it for a while. The kicker is the engine never even hiccuped until I changed the plugs initially at about 80,000 or so. Now I have 120,000 and still haven't permanetley fixed it. Anything I've done has only helped for a couple of days and yes I've reset the PCM after doing any troubleshooting. Any help out there would be greatly appreciated. Thanks!!

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Here's something you can try that I actually just did on my SVT by accident. Look at the orientation of your IAT sensor in your accordian tube. Make sure that sensor is lined up properly (wiring harness directly on top side). I rotated mine back and forth and it actually (!!!) made quite a noticeable difference in the low speed bucking. I guess that when the throttle plate is closed and air is swirling around between the TB and the filter, the sensor can get confused depending on its orientation. (But that's just a guess! )

Also, make sure your intake and filter are as straight and level as possible - this improves the efficiency of the intake and allows the air to enter the engine more smoothly - I'm guessing again that turbulence in the airstream can contribute to the bucking behaviour as well.