Engine locks at high rpm

Alfa_Zulu · 04-25-2011, 07:36 AM

When I run the engine close to the rev limiter the engine just locks briefly.
Thought it could be something to do with the valves not opening far enough to let the exhaust gasses out.

I'd appreciate any suggestions, and if you need more info just let me know

cre · 04-25-2011, 06:31 PM

You're going to have to explain precisely what "locks" means to you. To me it's a seized engine and those aren't a temporary issue.

Alfa_Zulu · 04-26-2011, 11:37 AM

Well it seems as though the exhaust gasses can't escape fast enough so some of it stays in the cylinder through the next intake and compression stroke causing to lock, a friend called it compression lock but I'm not real sure haha

mike91 · 04-28-2011, 02:08 AM

your probably just hitting the fuel cut.

Alfa_Zulu · 04-28-2011, 05:49 AM

No, this actually completely locks the drivetrain and the wheels for a brief second, if it was fuel flow it should just rev down shouldn't it?

mike91 · 04-28-2011, 11:50 PM

I'm pretty sure it could be. Kuz when I was doing some mods on my cars and hit fuel cut it felt like I hit a wall real quick and then kept going. And ya it happened when at high RPM. What mods have you done to your car?

mike91 · 04-29-2011, 12:12 AM

? do your wheels lock up and slide? or does it just feel like that?ha if they are stop driving it! LOL take your car into a shop, not a regular shop but a shop that knows performance cars. its guna be more $ but its worth it in the long run.

Alfa_Zulu · 04-29-2011, 08:53 AM

I think it just feels like it, not real sure lol. There aren't any mods atm so it could be fuel flow then

pwpanas · 04-30-2011, 02:44 AM

Quote:

Originally Posted by Alfa_Zulu

I think it just feels like it, not real sure lol. There aren't any mods atm so it could be fuel flow then

No mods at all? Not even to raise the boost? With a 100% bone-stock Mkiv Supra Turbo, you should never hit fuel cut...unless perhaps your wastegate VSV or your wastegate actuator is malfunctioning.

I agree with the others - if you are running more than oem boost levels, fuel cut does feel like you just ran into a wall.

04-25-2011, 07:36 AM	#1
Alfa_Zulu Stock Join Date: Apr 2011 Location: Australia Posts: 5	Engine locks at high rpm When I run the engine close to the rev limiter the engine just locks briefly. Thought it could be something to do with the valves not opening far enough to let the exhaust gasses out. I'd appreciate any suggestions, and if you need more info just let me know

04-25-2011, 06:31 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	You're going to have to explain precisely what "locks" means to you. To me it's a seized engine and those aren't a temporary issue. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-28-2011, 02:08 AM	#4
mike91 Stock Join Date: Jan 2011 Location: whittier CA. Posts: 17	your probably just hitting the fuel cut. __________________ 91 supra turbo targa

04-28-2011, 11:50 PM	#6
mike91 Stock Join Date: Jan 2011 Location: whittier CA. Posts: 17	I'm pretty sure it could be. Kuz when I was doing some mods on my cars and hit fuel cut it felt like I hit a wall real quick and then kept going. And ya it happened when at high RPM. What mods have you done to your car? __________________ 91 supra turbo targa

04-29-2011, 12:12 AM	#7
mike91 Stock Join Date: Jan 2011 Location: whittier CA. Posts: 17	? do your wheels lock up and slide? or does it just feel like that?ha if they are stop driving it! LOL take your car into a shop, not a regular shop but a shop that knows performance cars. its guna be more $ but its worth it in the long run. __________________ 91 supra turbo targa

04-26-2011, 11:37 AM	#3
Alfa_Zulu Stock Join Date: Apr 2011 Location: Australia Posts: 5	Well it seems as though the exhaust gasses can't escape fast enough so some of it stays in the cylinder through the next intake and compression stroke causing to lock, a friend called it compression lock but I'm not real sure haha

04-28-2011, 05:49 AM	#5
Alfa_Zulu Stock Join Date: Apr 2011 Location: Australia Posts: 5	No, this actually completely locks the drivetrain and the wheels for a brief second, if it was fuel flow it should just rev down shouldn't it?

04-29-2011, 08:53 AM	#8
Alfa_Zulu Stock Join Date: Apr 2011 Location: Australia Posts: 5	I think it just feels like it, not real sure lol. There aren't any mods atm so it could be fuel flow then

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