The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - '87 R10 suburban 350 V8 TBI stalls at lights

**Desert1957** · 06-13-2010, 11:58 AM

Before you replace the "Map Sensor" I would make sure the vacum line going to it is in good shape. If it has a hole, or is disconnected the sensor will think the engine is wide open throttle and will go FULL RICH, poor idle , black smoke and other problems.

Remember "TBI" GM engines DO have a re-learn feature , everytime the Computer or Battery is disconnected , may take a few miles to re-learn all parameters.

Desert

06-13-2010, 11:58 AM	#28
Desert1957 Registered User Join Date: Apr 2009 Location: New Freedom Pa. Posts: 1,335	Re: '87 R10 suburban 350 V8 TBI stalls at lights - suggestions? Before you replace the "Map Sensor" I would make sure the vacum line going to it is in good shape. If it has a hole, or is disconnected the sensor will think the engine is wide open throttle and will go FULL RICH, poor idle , black smoke and other problems. Remember "TBI" GM engines DO have a re-learn feature , everytime the Computer or Battery is disconnected , may take a few miles to re-learn all parameters. Desert