What could cause VTEC not to work?
01-15-2004, 08:23 PM
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What could cause VTEC not to work?
I finally got my wastegate to stop creeping, and got my car running nicely except that I don't think VTEC is coming on... the car is pretty slow for 7psi (as slow as stock). I haven't checked the wire(s) yet to see if they're getting power, I'll be doing that this weekend.
In the event that I find that VTEC isn't coming on, what are the causes? Bad Coolant Temp sensor? Anything else?
In the event that I find that VTEC isn't coming on, what are the causes? Bad Coolant Temp sensor? Anything else?
01-15-2004, 08:32 PM
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Re: What could cause VTEC not to work? (SiRkid)
Oil Pressure... not sure.
Water Temp - Car was up to temp.
Throttle - WOT.
Any other possibilities?
Water Temp - Car was up to temp.
Throttle - WOT.
Any other possibilities?
01-15-2004, 09:15 PM
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Re: What could cause VTEC not to work? (silverbulletgsr)
In order for the ECU to initiate the VTEC system, 5 engine conditions must be met.
Temperature: The engine must have reached normal operating temperature.
Throttle Position: The throttle must be open far enough to allow for increased airflow in VTEC.
Vehicle Speed: The car must be in motion (wheels spinning).
RPM: Engine must spin to it's target value. The GS-R will send it's "GO" signal for VTEC at 4400 RPM while the Type R sends it's signal at 5700 RPM.
Oil Pressure: The engine must be operating with normal and safe levels of oil pressure determined by the VTEC pressure switch.
The ECU will send a signal for a spool valve to open. When this valve opens, oil is allowed into the pivot shaft inside the valve rockers and directed into the center rocker. Inside the center rocker, a set of pins are forced outward by the oil pressure and lock inside the rockers to both sides. This entire process occurs in 1/10 of a second.
- Taken from the Team-Integra.net articles
Temperature: The engine must have reached normal operating temperature.
Throttle Position: The throttle must be open far enough to allow for increased airflow in VTEC.
Vehicle Speed: The car must be in motion (wheels spinning).
RPM: Engine must spin to it's target value. The GS-R will send it's "GO" signal for VTEC at 4400 RPM while the Type R sends it's signal at 5700 RPM.
Oil Pressure: The engine must be operating with normal and safe levels of oil pressure determined by the VTEC pressure switch.
The ECU will send a signal for a spool valve to open. When this valve opens, oil is allowed into the pivot shaft inside the valve rockers and directed into the center rocker. Inside the center rocker, a set of pins are forced outward by the oil pressure and lock inside the rockers to both sides. This entire process occurs in 1/10 of a second.
- Taken from the Team-Integra.net articles
01-15-2004, 11:22 PM
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Re: What could cause VTEC not to work? (Chris1091)
Your speedometer must be conected and working right, if it's not then v-tec will not engage, that's from my own experience.
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