Running rich problem??!! please help!
Thread Starter
Teching In
Joined: Sep 2006
Posts: 1
Likes: 0
From: Caraquet N.-B.
Running rich problem??!! please help! I have a 350 lt1 with ported and polished head, 2.00 intake valve and 1.55 exhaust valve, new ring and piston, new opti, cc306 cam, 52mm throttle body, #28 LS1 injector, PCMforless chip,(1993) long tube headers,problem: the engine is running very rich, always black dust comming out of the exhaust.the mechanic said that i only have 13 of vacum and it supose to have 18 for the map sensor working properly. so he said that we could put a resistence in it to make it think that he is at 18. for the rest, the engine is very strong. Any advice please???!
Teching In
Joined: May 2006
Posts: 21
Likes: 0
From: York,PA
Vaccum could be a problem along with alot of other things that combined could make it run rich such as plugs, plug wires, O2 sensors, etc. that was my problem until i fixed it and noted no smoke, better gas milege and i could also stand behind my car and not get a tear in my eye from the unburned gas fumes.
Originally Posted by luda0840
i thought #28 lbs ls1 injectors on the lt1 were only 18lb injectors? Wh yare you running ls1 injectors?
18lbs is too low. I thought it was more or less like 23lbs?
13" of vacuum... that's pretty damn good. I have almost the exact same setup, except 58mm t.b. and 30 lb. accel injectors, and Im only pulling 10-10.5" of vacuum.I have no intake/vacuum/exhaust leaks. I've been over my car with a fine tooth comb. I don't think your going to get anywhere close to 18" of vacuum with the big of a cam... my 10" is in the pretty norm range. for the cc306 cam. so yours is doing fine in the vacuum range. prob. need to work on the tune some more... I had to have alot of tuning to get it straight. it is close but could be alittle closer. the overlap on the cam is prob. causing some of the richness probs. I think alittle more tuning will help you out.
Trending Topics
Has Unresolved Sales
Joined: Dec 2005
Posts: 67
Likes: 0
From: austin tx
Originally Posted by buffman
18lbs is too low. I thought it was more or less like 23lbs?
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
you're running rich because its a mail order tune. They are almost always rich because its safer to foul out plugs and get shitty gas mileage rather than run lean on one cylinder and melt a piston, get a dyno tune, should help out a bunch. My car runs rich as hell too on a mail order but im heading up and getting a dyno tune probably in a couple weeks.
