The Central Hub for DSM Community and Information

For 1990-1999 Mitsubishi Eclipse, Eagle Talon, Plymouth Laser, and Galant VR-4 Owners. This is where the DSM platform history is documented and archived. Log in to help us in our mission, and to remove most ads from the browsing experience.

Post a Question

wideband readings

Please Support ExtremePSI

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

peter535

15+ Year Contributor
162
0
Aug 5, 2007
montreal,
ok so i just installed my wideband and i wanted to know something,on idle its reading 10.7, on full throttle 11.2 sometimes 10.8, and on cruising its on 12.3, so are those numbers good or bad,aslo lets say when im accelerating is it supposed to stay at one number???
 
Sort by date Sort by votes
^^I believe so, our ecu's have what's called "rolling" fuel cut where if the rpm's are over a certain point and the tps reads 0% the ecu cuts fuel... i would imagine that's what's causing you to peg lean.

someone feel free to correct me if I'm wrong.
 
Upvote0
Running that is really not safe you will be fouling plugs all the time and you could wash out your piston rings also. I would recomend you buy some type of fuel controller and a data logger. You need to be able to control your a/f mixture. Hope that helps a little.
 
Upvote0
i just went for a drive and at full throttle it was reading 10.0 i know thats no good anyone got any clue why its so rich?
 
Upvote0
Because you're not controlling your fuel with anything. If you've got larger injectors and a larger fuel pump you will run rich because your ecu doesn't compensate for larger injectors or higher flowing fuel pumps. You will continue to run rich until you get something to control those injectors a little better.
 
Upvote0
Something is causing your ecu to think there is more air going into the engine than their actually is.

I would reset the ECU by pulling the battery and pulling the "yellow" twin fuse in the under hood fuse box for @ least 10 minutes..(to be sure). This will reset the ecu. you then need to check to make sure your maf is clean and 100% working. (I happen to have an extra PM me if you want it)

Check for boost leaks and check your plugs.

That'll be a good start. Try that out and let us know how that goes.
 
Upvote0
Your ECU is seeing more than stock airflow. This will automatically enrich the mixture to protect itself. Each car is different so it's hard to say.

OFF TOPIC EXAMPLE:
I tune with DSMLink - and I have fuel pretty much pulled across the board, however between 2500-3500 I have to enrich for some reason. Idle 15.0, cruise 14.7-15.0, decel is Lean, and WOT is 11.15 to 1. 22Psi.

Mods are in profile.

On Topic:
I would look into getting a AFC or DSMLINK or something that you can control your fuel with. I don't know why you're running so rich - something isn't right. What's your gas mileage like?

Maybe the wide band is reading wrong? it could be a number of things....
 
Upvote0
im gonna do a boost leak test maybe on thursday hopefully its a boost leak cz i dont know what to look for next
 
Upvote0
what kind of wideband are you using? I know that with innovate widebands you have to do open air calibrations in order for the gauge to read correctly. Also where did you place the sensor in your exhaust system, that will sometimes have odd effects as well.
 
Upvote0
You're not running too rich at all @WOT from the stock point of view, stock fuel map is at about 9.5:1. Idle and part throttle however is a different story, I suspect you're not getting into close loop due to either faulty O2 or coolant sensor readings. This is why a logger is as important, if not more so, as a WB.

BTW Peter, please use proper grammar, caps and punctuation when posting in the tech sections.
 
Upvote0
Drubble said:
You will be running rich with just the intake and exhaust upgrades you have made, so now it's time to invest in something to enable you to lean out your fuel settings.
Click to expand...

95GSXBLUR said:
Your ECU is seeing more than stock airflow. This will automatically enrich the mixture to protect itself. Each car is different so it's hard to say.

OFF TOPIC EXAMPLE:
I tune with DSMLink - and I have fuel pretty much pulled across the board, however between 2500-3500 I have to enrich for some reason. Idle 15.0, cruise 14.7-15.0, decel is Lean, and WOT is 11.15 to 1. 22Psi.

Mods are in profile.

On Topic:
I would look into getting a AFC or DSMLINK or something that you can control your fuel with. I don't know why you're running so rich - something isn't right. What's your gas mileage like?

Maybe the wide band is reading wrong? it could be a number of things....
Click to expand...

No, an exhaust will make him run slightly lean like he said.
 
Upvote0
Dom_c13b said:
what kind of wideband are you using? I know that with innovate widebands you have to do open air calibrations in order for the gauge to read correctly. Also where did you place the sensor in your exhaust system, that will sometimes have odd effects as well.
Click to expand...

its the aem wideband and the sensor is on the downpipe
 
Upvote0
oldman said:
You're not running too rich at all @WOT from the stock point of view, stock fuel map is at about 9.5:1. Idle and part throttle however is a different story, I suspect you're not getting into close loop due to either faulty O2 or coolant sensor readings. This is why a logger is as important, if not more so, as a WB.

BTW Peter, please use proper grammar, caps and punctuation when posting in the tech sections.
Click to expand...

could it be the front o2 or the back one?
 
Upvote0
Add Value - Be Respectful - No Trolling - No Misinformation - Participate Often!

Similar threads

LTUDSM
  • Question
question about wideband readings
Replies
11
Views
1K
bostonhatcher
bostonhatcher
sidewaystsi
  • Question
Viewing wideband readings on the logger
Replies
0
Views
492
sidewaystsi
sidewaystsi
  • Question
Does a Wastegate Dump Effect Wideband Readings?
Replies
8
Views
12K
viperlp01
viperlp01
  • Question
vacum readings
Replies
5
Views
845
eric4g63
la-panocha
  • Question
Results/readings
Replies
7
Views
6K
la-panocha
la-panocha
Boosted Fabrication
ECM Tuning
ExtremePSI
FIBA Motorsport
Fuel Injector Clinic
Innovation Products
Jacks Transmissions
JNZ Tuning
Kiggly Racing
Morrison Fabrications
Rix Racing
RockAuto
STM Tuned
Support Vendors who Support the DSM Community

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds

Back
Top