(Still Yet Another DIY Thread)- Checking the Ignition Timing on a '97 TL 2.5
#1
09-16-2011, 06:37 PM
(Still Yet Another DIY Thread)- Checking the Ignition Timing on a '97 TL 2.5
Hello TL peeps!
Checking the ignition timing on your TL is simple and necessary if it has diverged from the specified stock numbers. Here's how you would check the timing on a 2.5L model (also works for a 3.0L model too):
Note: These vehicles have distributors, however the ignition timing is not adjustable. The ignition timing is controlled by the Powertrain Control (PCM) Module and can be checked for diagnostic purposes. If the timing is out of specification, all mechanical and electrical systems should checked for proper operation before replacing the PCM.
1) To check the ignition timing, start the engine and allow it to fast idle at 3000 rpm with all electrical accessories off and the transmission in N or P. Allow the engine to warm up and reach normal operating temperature. The engine cooling fan should cycle at least one time.
2) Locate the Service Check (SCS) connector out from under the glove box.
3) Connect the service connector tool part number 07PAZ-0010100 or equivalent to the SCS terminals.
4) Check the idle speed and adjust if necessary.
5) Connect a timing light to the No. 1 plug wire. While engine idles, point the light toward the pointer on the timing belt cover. (refer to this TL Timing Belt diagram)
6) Inspect the ignition timing at idle. The specifications are as follows:
2.5L Engine: 13-17 degrees Before Top Dead (BTDC) Center at 650-750 rpm
3.0L Engine: 8-12 degrees BTDC at 700-800
Note: All mechanical and electrical systems should checked for proper operation before replacing the PCM.
7) If the ignition timing is incorrect, replace the PCM.
8) Remove the service connector.
Checking the ignition timing on your TL is simple and necessary if it has diverged from the specified stock numbers. Here's how you would check the timing on a 2.5L model (also works for a 3.0L model too):
Note: These vehicles have distributors, however the ignition timing is not adjustable. The ignition timing is controlled by the Powertrain Control (PCM) Module and can be checked for diagnostic purposes. If the timing is out of specification, all mechanical and electrical systems should checked for proper operation before replacing the PCM.
1) To check the ignition timing, start the engine and allow it to fast idle at 3000 rpm with all electrical accessories off and the transmission in N or P. Allow the engine to warm up and reach normal operating temperature. The engine cooling fan should cycle at least one time.
2) Locate the Service Check (SCS) connector out from under the glove box.
3) Connect the service connector tool part number 07PAZ-0010100 or equivalent to the SCS terminals.
4) Check the idle speed and adjust if necessary.
5) Connect a timing light to the No. 1 plug wire. While engine idles, point the light toward the pointer on the timing belt cover. (refer to this TL Timing Belt diagram)
6) Inspect the ignition timing at idle. The specifications are as follows:
2.5L Engine: 13-17 degrees Before Top Dead (BTDC) Center at 650-750 rpm
3.0L Engine: 8-12 degrees BTDC at 700-800
Note: All mechanical and electrical systems should checked for proper operation before replacing the PCM.
7) If the ignition timing is incorrect, replace the PCM.
8) Remove the service connector.
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