87 R30 running rich, any suggestions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

drivewaycustoms · 12-16-2018, 01:49 AM

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

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

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

4x4k30 · 12-16-2018, 01:06 PM

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

Quote:

Originally Posted by 4x4k30

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

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

12-16-2018, 01:49 AM	#1
drivewaycustoms Registered User Join Date: Jan 2007 Location: Waldorf,MD Posts: 308	87 R30 running rich, any suggestions 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. Attached Images __________________ 87 Crewcab Dually 66 Cadillac Sedan deVille 55 Chevy Belair 33 Plymouth sedan 03 S-10 86 S-10 Blazer _____________________________________________ IG drivewaycustoms

12-16-2018, 02:47 AM	#2
GIZZ Registered User Join Date: Jun 2005 Location: Vancouver Posts: 111	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. __________________ GIZZmotorsports on YouTube & my panel truck build '69 c10 panel, '75 c35 flatdeck car hauler

12-16-2018, 11:59 AM	#3
drivewaycustoms Registered User Join Date: Jan 2007 Location: Waldorf,MD Posts: 308	Re: 87 R30 running rich, any suggestions Thanks. I’ll check for the sensor and check the cylinder temps. The air filter is new. __________________ 87 Crewcab Dually 66 Cadillac Sedan deVille 55 Chevy Belair 33 Plymouth sedan 03 S-10 86 S-10 Blazer _____________________________________________ IG drivewaycustoms

12-16-2018, 01:06 PM	#4
4x4k30 Registered User Join Date: Jun 2003 Location: ga Posts: 630	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 . __________________ 4x4k30 if trouble was money i would have plenty Last edited by 4x4k30; 12-16-2018 at 01:11 PM.

12-17-2018, 02:22 PM	#6
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,630	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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