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My 2002, 9-5 Linear 2.3L with 188k mi., intermittently starts and idles. The MIL is not illuminated and there are no stored codes. The engine has an occasional miss but otherwise operates as designed at idle or minimal throttle. Full acceleration pushes the boost needle up to the red mark. The engine initially bogs down under full throttle then dies when the throttle is lifted. It will not restart until it has cooled. Today, I swapped the black ignition cassette (with dielectric grease in the tips), as well as the Crank Position Sensor with known good parts. The original CPS read 1580 ohms while its replacement read 956 ohms. Neither one moved the tach during cranking. Despite these replacements, the engine continued to crank, but wouldn't start. I disconnected the three pressure sensors individually, read their P codes, cleared the codes, then reconnected the sensors. When the engine was running I properly repositioned the throttle body cable clip. The main relay 229 was shorted across terminals 30, 87A, and 87 and was replaced. The fuel relay 102, start relay 21, and ignition relay 517 all operate as designed. Each has power on terminals 30 and 86. The legs of the Maxi fuses are clean and have been verified in-situ. The dash fuses all test fine. Fuel pressure measured 38 psi cranking and 40 psi running. Previously, I verified the resistance of the throttle body cross circuits.
Mechanically, the valve timing is correct and there is a quarter tank of 93 octane fuel. I think the failure is ignition related but do not understand what I have overlooked. HELP!!!
posted by 69.247.253...
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