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2000 Chevrolet S10 4.3L V6 Engine Misfire with P1345 Code - Rough Idle and Intermittent Symptoms

Model: 2000 Chevrolet S10 Fault Code: P1345 Posted: 2015-03-26 08:35

My 2000 Chevrolet S10 equipped with a 4.3L V6 engine is showing fault code P1345. The vehicle exhibits intermittent misfiring, rough idle, and poor engine performance under load. The issue does not occur consistently—some days it runs smoothly, while other days the symptoms worsen significantly. I have already replaced the EGR valve and camshaft position sensor, but the problem persists. I'm using a friend's scanner that lacks live data functionality. Can anyone confirm if P1345 is specifically related to CKP (Camshaft Position) and CMP (Crankshaft Position) sensor correlation? Any additional diagnostic steps or common causes for this intermittent issue?

Related fault codes
P1345
Comments (3)
Anonymous 2015-03-26 08:45

Code P1345 indicates a mismatch between the Camshaft Position (CKP) and Crankshaft Position (CMP) sensors. Are there any other diagnostic trouble codes stored in the system? Has there been any recent engine work performed, such as repairs or replacements? Do you have access to an OBD2 scanner with live data capability for real-time sensor readings?

Anonymous 2015-03-26 09:05

P134-than is the only fault code present. I used a friend's OBD2 scanner, which does not support live data monitoring. I've already replaced both the EGR valve and the camshaft position sensor. The issue appears intermittently—on some days it runs fine, but on others, especially under load, it becomes noticeably rough with poor idle performance.

Anonymous 2015-03-26 10:38

Please check the following potential causes: > A loose or missing distributor hold-down bolt. > A loose or damaged Cam Position (CMP) sensor leading to signal variance. > A worn or loose distributor rotor on the shaft. > Excessive free play in the timing chain and gear assembly. Since the symptoms come and go, an intermittent fault is likely. Possible root causes include: > Poor electrical connections. > Worn or rubbed wire insulation. A diagnostic scanner with live data can perform tests such as Camshaft Position Offset verification to confirm sensor alignment issues more accurately.