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I am about to replace the distributor cap, rotor and plugs in my '93 944T with 97K miles. I have never done this before (on this or any other car) so I apologize if I sound like the newbie that I am. My car shudders during idle and fluctuates between 500-800 RPM. I have cleaned the throttle body, which did not seem to eliminate the problem. Someone else on this board suggested that I check the cap, rotor and plugs. Since I don't know when the PO did this work, I will probably replace them even if the old ones look OK. What I am confused about is whether I will need to check the timing when I am finished installing the new components. It appears from the FAQ that the later cars that have an RPM sensor do not require timing adjustments, using a timing light, etc. Is this true? The VolvoWorld site includes instructions for installing a new cap and rotor that includes using a light to adjust the timing by rotating the cap to the proper position and tightening the bolts, but I think this may be for older 740's. Will I need to do this, or can I forego buying a timing light? Is there anything else I should do in addition to plugs, caps and rotors (wires look fresh, no evidence of worn insulation, etc.). Anything else I should do to make my car stop shaking? I will have a Volvo mechanic do a new timing belt at 100K, but I want to do as many other things myself as I can. Thanks.
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Steve Van Steenhuyse ('95 944T, 95K)
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