Is it possible to be running this rich without noticing it?

Heads, valves, pistons, rods, crankshaft, etc...

Moderators: Helpinators, Moderators

Post Reply
DeusExMachina
First Gear
Posts: 231
Joined: Mon May 10, 2004 5:01 am

Is it possible to be running this rich without noticing it?

Post by DeusExMachina »

Recently I've been attempting to re-tune my car for colder weather. I take some logs with my wideband...9.6 AFR into boost? Thats the lowest threshold on the sensor...it pegs down. I reset my eManage to stock mapping. Same thing. I run 13 psi on stock maps, pretty much stock car except for exhaust and intercooler, same thing..reset the car's ECU, the same.

The car drives like it always has. I pulled a plug, looked good, smelled it, didn't smell like it was drenched in fuel. I see no smoke when driving the car hard. The wideband seems to read normally at all other times.

I'm pretty certain my wideband decided to make itself a narrow band all of a sudden, but I'm real nervous about washing my cylinder walls.

Anyone got any input?
Top
vrg3
Vikash
Posts: 12517
Joined: Sun Nov 03, 2002 2:13 am
Location: USA, OH, Cleveland (sometimes visiting DC though)
Contact:
Contact vrg3

Post by vrg3 »

Does closed loop seem to be working correctly?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
Top
DeusExMachina
First Gear
Posts: 231
Joined: Mon May 10, 2004 5:01 am

Post by DeusExMachina »

vrg3 wrote:Does closed loop seem to be working correctly?
Can you elaborate, Vikash? Not sure what ya mean..
Top
vrg3
Vikash
Posts: 12517
Joined: Sun Nov 03, 2002 2:13 am
Location: USA, OH, Cleveland (sometimes visiting DC though)
Contact:
Contact vrg3

Post by vrg3 »

At idle, do air/fuel ratios bounce above and below 14.7:1, but stay fairly close?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
Top
DeusExMachina
First Gear
Posts: 231
Joined: Mon May 10, 2004 5:01 am

Post by DeusExMachina »

Yeah, it seems to bounce around, I remember usually it would stay pretty dead on 14.7. Now it bounces a LOT. Sort of dramatically, too. No difference in the feel of idle.
Top
vrg3
Vikash
Posts: 12517
Joined: Sun Nov 03, 2002 2:13 am
Location: USA, OH, Cleveland (sometimes visiting DC though)
Contact:
Contact vrg3

Post by vrg3 »

Hmm, that's a little odd... It is a little weird that it would start bouncing around more than it used to.

What does it do if you disconnect the ECU's oxygen sensor input?
"Just reading vrg3's convoluted, information-packed posts made me feel better all over again." -- subyluvr2212
Top
DeusExMachina
First Gear
Posts: 231
Joined: Mon May 10, 2004 5:01 am

Post by DeusExMachina »

Haven't tried it yet...I'll give it a go tomorrow. The sensor is new as of last spring, though.
Top
DeusExMachina
First Gear
Posts: 231
Joined: Mon May 10, 2004 5:01 am

Post by DeusExMachina »

Okay..update..
My wideband isn't bad unless the Zeitronix controller is. I haven't unplugged the ECU's o2 yet..but wont it just run rich without it?

I'm cleaning my MAF as we speak..I re-did my post-turbo/intercooler piping with silicone couplers to make sure there's no leaks...didn't do anything.

What could make the car go so rich? I did some logs...10 psi I'm getting 74% IDCs at a highest. That doesn't sound like much considering 11psi is 80%.

It seems to only have started when the weather got cold.
Top
DeusExMachina
First Gear
Posts: 231
Joined: Mon May 10, 2004 5:01 am

Post by DeusExMachina »

Bump...
Top
Post Reply

Return to “Engine”