High HC emissions
Thread Starter
Intermediate
Joined: Aug 2004
Posts: 49
Likes: 1
From: Crown Point IN
High HC emissions
The HCs are high and looks like only when at idle or decelerating. They also detectd a HC leak at the right rear of car @39 PPM.
It’s had this problem since I have had it and I took it in to get it diagnosed a few years ago and they said it was the CATS. I changed these and the problem was still there. I have also changed plugs, wires, O2 sensors, and cleaned injectors. The replacement CATS I used were some cheap ones and look undersized so may still be the cause.
Any other suggestions??
It’s had this problem since I have had it and I took it in to get it diagnosed a few years ago and they said it was the CATS. I changed these and the problem was still there. I have also changed plugs, wires, O2 sensors, and cleaned injectors. The replacement CATS I used were some cheap ones and look undersized so may still be the cause.
Any other suggestions??
Melting Slicks
Joined: Feb 2005
Posts: 2,135
Likes: 0
From: Sebastian Florida
St. Jude Donor '06
Car will not run at 39 rpm, did you mean 3900 rpm?
What do you mean by high HC's at the right rear?
Does that mean the right exhaust at the tip or right rear of engine?
What year?
Was the car diagnosed, after throwing parts at it failed?
What do you mean by high HC's at the right rear?
Does that mean the right exhaust at the tip or right rear of engine?
What year?
Was the car diagnosed, after throwing parts at it failed?
Burning Brakes
Joined: Apr 2006
Posts: 765
Likes: 0
From: Houston Texas
Don't know what he meant about the rear of the car though.
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
HC is unburned fuel, in the exhaust it is often caused by misfire if the vehicle has no other failures. HC at the right rear could be a gas cap problem or evap system leak, they are designed to contain and burn fuel vapors that would otherwise escape to the atmosphere.
Instructor
Joined: Jan 2000
Posts: 225
Likes: 0
From: Round Rock, TX
