I cant pass emissions because of to much unburned fuel. I really dont know what todo. Help!

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92 Firebird
305TBI, Edl.Tbi Perf.Manifold, Full exhaust, air intake, 16" wheels, Tbi spacer

 

I would suggest checking the vacuum line to the MAP sensor. If it is broken or missing that allows less vacuum to be on the MAP sensor which causes the ECM to think the car is @ WOT all the time (dumping quite a bit of fuel into the engine). This would definitly cause the unburned fuel problem.

Also I'm sure you checked spark @ all 8 cyl.

 

Ditto on the spark plug check. Then watch the injectors at idle, they shouldn't be firing too crazy and just have a friend give it a little gas, watch the rate increase. Do you have an aftermaket chip? Do you have any codes pop up?
Change the wires and the cap/points. Sometimes the easiest stuff gets overlooked.
Another option could be to get a MSD 6a box but that would be after you figure out the rich condition.

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, Jon (350 TBI! getting 23mpg highway)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

 

I have no chip. Im going to check my plugs and such tomorrow. There has been no codes eather.

 

Well I put new plugs(NGK) and wires on. The plugs are a little hotter and I gaped them more than 3.5. Never knew those things could make such a diff. Runs great now! As far as the running rich, I think it was the vacume line dealing with the egr. Still a little more checking todo though.

 

Good to hear it was the little stuff . I had that same problem when I did my engine swap. The old wires were crap and there was major arcing, I changed them and the car runs without stalling and doesn't miss.

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, Jon (350 TBI! it's trenuous and efficacious while getting 23mpg highway with off the shelf eprom)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

 

You should also check the water temperature sensor on the intake manifold (at the front). If it's not working right, it will cause it to run rich and sometimes stall at idle. I know this because it's exactly what my car did before I changed it. Runs 100 times better now. Your air intake temperature sensor could do the same thing too (the one in the air cleaner).

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1992 RS
305 TBI, Edelbrock Performer TBI, TPI heads, Open K&N filter, SLP 1 5/8" headers, !cat, custom 3" exhaust, Flowmaster 80 series, MSD 6-AL, MSD Blaster GM coil, Accel Cap and Rotor, Accell 8.8 MM wires, World Class T-5, B&M Ripper Shifter, Nitto 275/50/15 Drag Radials, Radial T/A's up front, LakeWood LCA's, Edelbrock panhard rod, Aluminum driveshaft, LakeWood Drag shocks, IROC rear springs, custom interior, etc.

 

Your cat could be the culprit. If you still have the original catalytic convertor I would have it replaced. I failed emission test due to being to rich and passed when the new cat was incorporated.

 

Well I finally passed! I changed my sparkplugs to a hotter plug and that seemed to work. H\c was at 22 instead of 448. I might have to look into replacing the water temp. sencor, its loose. Maybe the air sencor too, Its looking worn if you know what I mean. Thanks for all the help guys!