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vtec?

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Old Jul 15, 2003 | 02:52 PM
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Check your oil level. What are the engine codes that you have?
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Old Jul 15, 2003 | 05:26 PM
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Originally posted by fc735
a bad upstream one will...downstream will do nothing but set a code.

JOEY
Doesnt the ecu ignore the upstream during open loop, therefor not causing any performance problem at wot? Now at part throttle thats another story....
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Old Jul 15, 2003 | 05:39 PM
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in open loop, the ECU is running off of its base maps..with no correction for fuel control. when its in closed loop..thats when it does its thing, using the o2 sensor to constantly monitor the fuel mixture, and change it accordingly. and, most vehicles have to be over set parameters to go into closed loop...usually a time limit, and a set engine temperature has to be reached..usually 165ish...depends on the maker...
that is why any "stage 2" chip has to be used with a low temp thermostat......keeping the engine cold enough to run on the programmed maps, and not having the ECU compensate for it....kinda confusing, and prolly too much unneded info, but i figured i'd share it.

JOEY
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Old Jul 15, 2003 | 06:28 PM
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i dont know much about vtec but a friend of mine had a problem with his vtec. the problem happened to be with the Knock sensor. try seeing if thats the problem
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Old Jul 15, 2003 | 07:02 PM
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Originally posted by mpg9999
I dont think a bad o2 sensor will make the car go into limp mode.
It would however make it run rich.
thats what limp mode is, open loop, somethings wrong, it dumps fuel..........
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Old Jul 15, 2003 | 08:33 PM
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Originally posted by MORE IMPATIENT
thats what limp mode is, open loop, somethings wrong, it dumps fuel..........
No, that is wrong. Open loop and limp mode are two very different things.
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Old Jul 15, 2003 | 08:46 PM
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Originally posted by fc735
in open loop, the ECU is running off of its base maps..with no correction for fuel control. when its in closed loop..thats when it does its thing, using the o2 sensor to constantly monitor the fuel mixture, and change it accordingly.
JOEY
Exactly.
Originally posted by fc735

and, most vehicles have to be over set parameters to go into closed loop...usually a time limit, and a set engine temperature has to be reached..usually 165ish...depends on the maker...
that is why any "stage 2" chip has to be used with a low temp thermostat......keeping the engine cold enough to run on the programmed maps, and not having the ECU compensate for it....kinda confusing, and prolly too much unneded info, but i figured i'd share it.
over set parameters? Im not sure what you mean by that. Open loop is used during WOT, indicated by I think tps voltage and load (maf sensor). It is also used during startup, when the oxygen sensor is too cold to give a good reading.
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Old Jul 16, 2003 | 04:53 AM
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the oil is fine, ill try to check my codes today
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Old Jul 17, 2003 | 03:55 PM
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set parameters:meaning programmed specifics the engine has to be over for the vehicle to go into closed loop....wuch as, has to be over X temp, for X minutes...etc...varies with each manufacturer

JOEY
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Old Jul 17, 2003 | 07:27 PM
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Are you sure your oil is fine my old EX would quit working (VTEC) when the oil was old.....(Over 3000 miles...* we were harsh on her..lol)

Edit: buy a nissan this wont be a problem anymore.....


I would also say get on the rd. put it in 3rd and stay in 3rd jumping the throttle....It seemed to work on my boys GSR.....(His solenoid is going bad though)...just a thought.......







J/K
Last edited by RatedV; Jul 17, 2003 at 07:32 PM.
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