Engine Running Rich Due to Fuel Leak Inside Intake Manifold on Chevrolet S10

Vehicles using the enhanced vortec V6 engine may be hard to start run poorly and/or use to much fuel due to a fuel leak inside the intake manifold plenum. Commonly this is caused by a leaking fuel pressure regulator or fuel line. The fuel system will need to be pressurized with the upper intake manifold removed in order to determine the exact cause of the leak. Removing the "tuning valve" from the upper intake can allow for limited visual inspection without removing the upper intake manifold.

Average mileage: (–)
2 model years affected: 1994, 1995
2 people reported this problem
0 people shared problem details
Related Items:
Fuel leak where line connects to the fuel rail. such little room to move a wrench, between bloc...
4.3L V6 It takes 2 to 3 trys to fire over, when the engine warms up it miss fires when driving...
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Our technicians tell ...
Runs rough, won't idle, lurches, can't go faster than 25 mph. Replaced TPS & IAC Valve........N...
This is a new truck to me, service unknown. Starts up fine, idles with a slight roughness. Most...

Related Content