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1997 Pontiac Grand Prix 3800 Engine Code P144- EVAP System Flow During Non-Purge - Diagnosis & Fix Guide

Model: 1997 Pontiac Grand Prix Fault Code: P1441 Posted: 2007-09-05 17:58

Hi everyone, I recently joined this forum because I deeply love my 1997 Pontiac Grand Prix SE with the 3800 engine, but I'm currently facing serious issues that need urgent attention. My car has 173,000 miles on it and recently had a tune-up along with a new oxygen (O2) sensor. Despite this, it's now throwing Diagnostic Trouble Code P1441 — indicating an EVAP (Evaporative Emission) System flow during non-purge condition. I initially took it to a shop in Idaho where the technician diagnosed it as a simple gas cap issue and charged me $140. After replacing the gas cap, the check engine light returned and the vehicle started shaking again. I demanded my money back and went to the dealership. The dealer explained that P1441 is an 'active' code and wasn't triggered at the time of inspection — so they advised driving it for a while. After several miles, no improvement was seen. I then returned to Southern California, where the vehicle continues to exhibit intermittent shaking on the freeway and suffers from reduced power. I'm now at a point where I can no longer afford the high prices dealerships typically charge. Any accurate technical guidance or troubleshooting steps for this specific code would be extremely helpful! Thanks in advance for your input.

Related fault codes
P1441
Comments (3)
Anonymous 2007-09-06 08:15

This is not a wrong forum — it's a very relevant issue for older Pontiac Grand Prix owners. If you can't afford dealership repairs, you're absolutely right to look for affordable DIY or independent solutions. Dealerships often charge premium prices without always providing the best value. Focus on reliable, cost-effective diagnostics and fixes.

Anonymous 2007-09-06 08:36

Moved to ensure proper categorization under engine and EVAP system issues.

Anonymous 2007-09-06 08:42

The P1441 code indicates constant purging of fuel tank vapors into the engine, which shouldn't happen during non-purge conditions. This abnormal behavior can cause drivability problems like stumbling, rough idle, or poor performance. Technicians who blamed a faulty gas cap are incorrect — while a bad cap can cause leaks, it wouldn’t explain the vehicle’s poor running characteristics. The root issue is likely a leaking purge solenoid. If dirt is clogged in the valve or the solenoid itself is defective, it won't seal properly and will create a vacuum leak, leading to engine hesitation and performance loss. To test this: locate the EVAP purge line — typically a small plastic hose with a green cap. Disconnect both ends of the hose from the engine and plug them securely. Drive the vehicle under normal conditions. If the shaking stops or improves significantly, then the purge solenoid is likely faulty. Note: This action will trigger a different EVAP code (e.g., P1442), but ignore it temporarily — we're testing whether purging is occurring continuously. Once you confirm this behavior, simply replace the purge solenoid and clear the original codes. This fix is cost-effective and commonly used in 1997–2000 Pontiac Grand Prix 3800 models with similar EVAP systems. Hope this helps!