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There can be two reasons for not getting a rpm signal... 1. PROBLEM W/ VEHICLE: The smog machine uses an inductive pickup system to track engine RPM signals. This system involves a non-intrusive method of gathering data. The smog technician rather then tapping directly into the ignition system uses a tool call the inductive pickup which is attached to the exterior of the number 1 spark plug wire over the wires insulation. The unit senses electronic pulse through the wire and relays the data to the smog machine. One reason the signal can not be detected may be due to low voltage. This could mean your vehicle needs new spark plugs and wires, and perhaps a new ignition coil. A smog check repair station can use an engine ignition analyzer to determine if this is the case. 2. PROBLEM W/ SMOG MACHINE: The second reason for a lack of RPM signal might be due to a faulty inductive pickup. This would require the smog station to utilize a non faulty tool. The verify whether the problem is due to the smog machine or you vehicle would require a hands-on diagnosis of both the smog machine and/or vehicle. More information can be found at: http://www.smogtips.com Please copy and paste the link above in your web browser.

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Q: What do you replace or check if you cannot get an RPM signal during a smog check for a 1995 Chrysler Sebring LXi?
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