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I am getting a cel code 45 (too rich or too lean).

I recently instaled venome injectors could this be the cause of this cel?

If so is there any thing that I can do to correct this?

 

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My car started showing a CEL light last night. (#45: too rich, too lean)

From reading some of the archived threads I get the impression that the 45 code is primarily related to some type of O2 sensor problem. And that its not really something that is going to grenade the engine if left untouched for a week or two until I get it into the shop to see what is going on.

I'm not sure if its related to my cam upgrade or if its related to a sensor in the header or cat. What should I be looking for when I inspect the o2 sensor at the header exit and at the cat?
 

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my friend has a Civic Si with skunk2 stage 2 cams. he ran into the code 45 problem. it's just dumping way too much fuel in at idle. you can a.) run higher octane fuel or b.) get a standalone engine management system. my friend went with the AEM EMS and seemed to take care of his problems after being dyno tuned.
 

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nospeedlimit143 on Feb/11/03 said:
It's just dumping way too much fuel in at idle. you can a.) run higher octane fuel or b.) get a standalone engine management system.
This makes sense but why would it take 3 weeks to register the rich mixture at idle from the cams?

Earlier in the day (that is started showing the CEL) I switched from 91 octane down to 89 octane. My intake cam is only advanced 1 degree and my ignition timing is at 16. So there is no way that I'm running higher CR's, so I decided to step down to the 89.

Is it a coincidence that the same day I started using the 89 octane that it showed the CEL later on in the day?
 

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hmm... i don't know the details behind it, but it makes sense that if you used a lower octane fuel it would kick on the CEL. I honestly don't know what to tell ya other than bring it to a performance shop and see what they say. If you continue to keep burning rich, you risk messing up the O2 sensor or cat. I don't think the engine itself is in danger though until then. If the cams you put in are mild, you can probably get away with tuning it with a VAFC to lean it out a bit. Do you have adjustable cam gears? Also have you had it dyno tuned?
 

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LTB420 on Jun/10/02 said:
I am getting a cel code 45 (too rich or too lean).

I recently instaled venome injectors could this be the cause of this cel?

If so is there any thing that I can do to correct this?

i just checked your list of mods you have, and it looks like you definitely have way too much fuel going in your engine for what you have done. i'm not familar with the Venom 400 computer, but if possible, get it tuned with a wideband O2 sensor and get your air/fuel mixture straightened out.
 

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nospeedlimit143 on Feb/11/03 said:
If the cams you put in are mild, you can probably get away with tuning it with a VAFC to lean it out a bit. Do you have adjustable cam gears? Also have you had it dyno tuned?
I already have an SAFC and the cam gears....its also been tuned on a dyno (three weeks ago) and ran fine up until yesterday evening. I haven't figured out how to lean out the fuel via the safc at idle though. My throttle points are 35% for the "low" position and 85% for the "high" position. So leaning out the 1000 rpm setting doesn't help me until I'm under partial throttle.
 

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hmm... after looking over your mods... i'd have to say you are heading in the right direction. you may been a better engine management unit than the SAFC so you have more control over the engine. an AEM EMS may be a bit of overkill, but will leave you with a lot of room for expansion.

just to clear something up... if you reset your ECU... the CEL won't come back on until you let the car idle again, right?

have you tried running premium in it after resetting the ECU. you might just be having problems from when you put lower octane fuel in it. before you go spending $$$ on new parts and more dyno tuning... see if switching back to premium and resetting your ECU works.
 

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I put some 91 octane in the car last night on my way home from work. The CEL still lit up on my way to work this AM....but on my lunch break I noticed that it no longer appears. So guess that the lower octane was what was causing the CEL. Very weird......mmm
 
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