Running Rich
Thread Starter
Le Mans Master
Joined: May 2007
Posts: 5,753
Likes: 15
From: Parkersburg West Virginia
Cruise-In X Veteran
Running Rich
I have a heads/cam '99 Coupe that has been tuned but seems to run extremely rich. It almost burns your eyes to stand behind it and really coats the pipes. Someone told me to run one step hotter plugs and this will help. What are your thoughts on this?
Le Mans Master
Joined: Jan 2007
Posts: 7,364
Likes: 6
From: Rocky Mount Virginia
First check for codes. Are you running a different MAF? Sounds like it is out of whack. Try cleaning it with electrical cleaner. Your O2 sensors may be faulty.
Start with checking codes on your DIC.
Start with checking codes on your DIC.
Race Director
Joined: Mar 2001
Posts: 11,405
Likes: 26
From: Whippany NJ
CI 6-7-8-9 Veteran
St. Jude Donor '08-'09
NCM Sinkhole Donor
I would first have it strapped to a dyno with wide band and check what the afr its running at. optimal is 12.8-12.9. Then have a reputable tuner make the necessary adjustments. 
Thread Starter
Le Mans Master
Joined: May 2007
Posts: 5,753
Likes: 15
From: Parkersburg West Virginia
Cruise-In X Veteran
I don't have any codes but something tells me that it may be disconnected. I'm having other issues with it as well and will get in to those in another thread. I bought the car because the guy said that it was done right and didn't need anything. Guess that wasn't the case.
Thanks for the replies.
Thanks for the replies.
Le Mans Master
Joined: Oct 2000
Posts: 6,362
Likes: 30
From: Oak Harbor WA
Burning Brakes
Joined: Sep 2005
Posts: 987
Likes: 1
From: Braidwood Il.
When a fuel injected car runs that rich as yours does, I would say the fuel pressure regulator is bad. I've seen that before on cars with that same thing happening.
Put a gauge on the fuel line and check the pressure that will tell you if its the regulator.
Put a gauge on the fuel line and check the pressure that will tell you if its the regulator.
