Running Kind Of Rich, Why?

[sidewazegtst]

Hey everyone.

Ok did my emissions test and the car passed the curb/idle test but failed under load. Now b/c my temp plate was up today I had to go "do " another test which of course I passed.

Now anyway here's my issue, according to the sheet I'm running a bit rich and I wanted to know what most likely would be the problem. Here's a run down on my car,

1990 GTS, bone stock, 102K km's. I have reset the ecu to run on 94 octane (the highest grade available in Canada at the pumps, used a bottle of injector cleaner and octane boost to help clean the system but have not change my plugs as yet.

So here's the normal possibilities,

1. BAD PLUG(S)

2. BAD O2 SENSOR

3. BAD COILPACK(S)

I am trying to trouble shoot but based on what I wrote above what do you guys think it most likely will be? As well when the car is idling and I punch the throttle from under the hood it sounds kinda sluggish but then catches and goes. It's almost like a dead cylinder but of course once the rpm's are up there everything seems fine. So again, bad plug(s) or coilpack(s)? Would that really contribute to running rich b/c that seems more like a bad O2 sensor to me? LOL, who knows could be all the above.

I just wanted some of your thoughts on this and I appreciate it.

Take care all.

Cheers B)

[Johnny Cash]

How do you reset ecu?

[Kennedy]

Hey everyone.

Ok did my emissions test and the car passed the curb/idle test but failed under load. Now b/c my temp plate was up today I had to go "do " another test which of course I passed.

Now anyway here's my issue, according to the sheet I'm running a bit rich and I wanted to know what most likely would be the problem. Here's a run down on my car,

1990 GTS, bone stock, 102K km's. I have reset the ecu to run on 94 octane (the highest grade available in Canada at the pumps, used a bottle of injector cleaner and octane boost to help clean the system but have not change my plugs as yet.

So here's the normal possibilities,

1. BAD PLUG(S)

2. BAD O2 SENSOR

3. BAD COILPACK(S)

I am trying to trouble shoot but based on what I wrote above what do you guys think it most likely will be? As well when the car is idling and I punch the throttle from under the hood it sounds kinda sluggish but then catches and goes. It's almost like a dead cylinder but of course once the rpm's are up there everything seems fine. So again, bad plug(s) or coilpack(s)? Would that really contribute to running rich b/c that seems more like a bad O2 sensor to me? LOL, who knows could be all the above.

I just wanted some of your thoughts on this and I appreciate it.

Take care all.

Cheers B)

Could be any of those three. I'd be leaning towards bag plugs. Have you turned up boost at all?