Idles high, hesitates or stalls when attempting to accelerate

1995 CHEVROLET MONTE CARLO

186,000 MILES • 3.1L • 6 CYL • 2WD • AUTOMATIC

KELB1911

MEMBER
1 POST

Car cranks fine. Ran and drove perfect until about a month ago. Now it loses acceleration on inclines, and when it comes to a complete stop (ie stoplight/stop sign) when I press the gas pedal, it hesitates and stalls out.

I have cleaned the throttle body, replaced IAC, TPS, MAP sensor, coolant temperature sensor, and fuel filter. No change.

Any help or assistance with this issue will be greatly appreciated.

Jul 2, 2020 at 6:05 AM

KASEKENNY

✓Experienced Mechanic
18,907 POSTS

I suspect you have an issue with the purge valve. If these get stuck open then it can cause this issue. Basically the engine runs to rich and it will do what you are seeing.

I would remove the purge valve and inspect it to see if it looks like it has some charcoal build up in it. If it does then I bet you have raw fuel in the charcoal canister which breakdown the charcoal and causes the valve to stick.

Let me know what you find and we can go from there. Thanks

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
Click here to log in and view diagram.

Jul 2, 2020 at 12:05 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.