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- - 87 R30 running rich, any suggestions (https://67-72chevytrucks.com/vboard/showthread.php?t=777287)

drivewaycustoms

12-16-2018 01:49 AM

87 R30 running rich, any suggestions

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I have an ‘87 R30 dually,454,400, fuel injected(tbi) . When I start it up it the exhaust gas smell is so rich that it’ll make your eyes water. Any suggestions? I’ve already changed the O2 sensor, throttle body gaskets and coolant sensor.

GIZZ	12-16-2018 02:47 AM

Re: 87 R30 running rich, any suggestions

Map sensor? A very plugged air filter? Spark plugs all look the same? Could take temp reading alongthe exhaust manifolds to see if all the cylinders are firing.

drivewaycustoms

12-16-2018 11:59 AM

Re: 87 R30 running rich, any suggestions

Thanks. I’ll check for the sensor and check the cylinder temps. The air filter is new.

4x4k30

12-16-2018 01:06 PM

Re: 87 R30 running rich, any suggestions

you need to check the fuel pressure regulator on the throttle body it will cause it to run rich and check the t/b gasket and t/b for any vacuum leaks .

drivewaycustoms

12-16-2018 10:24 PM

Re: 87 R30 running rich, any suggestions

Quote:

Originally Posted by 4x4k30 (Post 8406477)

you need to check the fuel pressure regulator on the throttle body it will cause it to run rich and check the t/b gasket and t/b for any vacuum leaks .

Thanks, I’m gonna pick up a rebuild kit, they’re cheap and shouldn’t take long to do.

kwmech

12-17-2018 02:22 PM

Re: 87 R30 running rich, any suggestions

Vacuum line to the MAP sensor...check for cracks. Also the water base plate under the TBI was famous for blowing the gasket out on the vacuum side of the EGR port

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