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High rpms..??

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Old Jul 26, 2015 | 10:36 PM
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High rpms..??

So I've started my swap up finally and it climbs to 4,000 and more rpms. I turn it off when it gets there cause the motor hasn't run in a while. Do they all do this? New to the game. Any help is appreciated. Thanks!
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Old Jul 27, 2015 | 08:48 AM
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High rpms..??

It's normal for a 3k warmup if the accelerate warmup system is intact and working. However, 4k+ would lead me to believe you've got other things out going on (timing, TPS, vacuum leaks, etc.). Have you messed with any of these things yet?
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Old Jul 27, 2015 | 08:59 AM
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Originally Posted by DC5Daniel
It's normal for a 3k warmup if the accelerate warmup system is intact and working. However, 4k+ would lead me to believe you've got other things out going on (timing, TPS, vacuum leaks, etc.). Have you messed with any of these things yet?
I still need to set timing and I'll check all vacuum lines. And TPS I haven't touched. Should I set my yellow line and my CAS up again and start there and see if that helps?
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Old Jul 27, 2015 | 09:52 AM
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or sticking throttle
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Old Jul 27, 2015 | 11:11 AM
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[QUOTE="Lyger;11946340"]or sticking throttle[/QUOTE

The peddle isn't down and it's not open. Can this still happen tho?
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Old Jul 27, 2015 | 01:17 PM
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yes. it can still happen. check the linkage on the throttle body itself.

my guess is you have a vacuum leak somewhere.
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Old Jul 27, 2015 | 03:30 PM
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if its a stock AFM system car then a vacuum leak usually results in an RPM drop and idle hunt if its bad enough. advanced timing can cause idle to speed up as well but not by more than a few hundred RPMs. a sticking thermowax can also raise the idle but not to 4k by itself without the AWS activated first.

id start with throttle linkage, since it seems the most likely problem.
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Old Jul 27, 2015 | 04:10 PM
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Originally Posted by Lyger
if its a stock AFM system car then a vacuum leak usually results in an RPM drop and idle hunt if its bad enough. advanced timing can cause idle to speed up as well but not by more than a few hundred RPMs. a sticking thermowax can also raise the idle but not to 4k by itself without the AWS activated first. id start with throttle linkage, since it seems the most likely problem.

It's a street ported turbo with emissions removed. I don't have the AFM hooked up either...
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Old Jul 27, 2015 | 05:09 PM
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Originally Posted by Graham7
It's a street ported turbo with emissions removed. I don't have the AFM hooked up either...
what engine management are you running?
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Old Jul 27, 2015 | 10:01 PM
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From: Gloucester va
Stock ECU
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Old Jul 28, 2015 | 05:41 AM
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High rpms..??

Originally Posted by Graham7
Stock ECU
How is it even running at all? The car should die after startup with no AFM activity detected.
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Old Jul 28, 2015 | 06:10 AM
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High rpms..??

Originally Posted by DC5Daniel
How is it even running at all? The car should die after startup with no AFM activity detected.
^this
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Old Jul 28, 2015 | 08:18 AM
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Originally Posted by DC5Daniel
How is it even running at all? The car should die after startup with no AFM activity detected.
I do not know but it is😳 so I take it it is dumb of me not having that?
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Old Jul 28, 2015 | 08:31 AM
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Originally Posted by Graham7
I do not know but it is😳 so I take it it is dumb of me not having that?
without the AFM the computer won't know how much fuel the engine needs, so yeah, surprised it even runs for more than a few seconds without it on the car.
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Old Jul 28, 2015 | 08:43 AM
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[QUOTE="Lyger;11946860"] without the AFM the computer won't know how much fuel the engine needs, so yeah, surprised it even runs for more than a few seconds without it on the car.[/QUOTE


So would that explain why it's throwing so much fuel in for 4,000 rpms...?
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Old Jul 28, 2015 | 09:21 AM
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[QUOTE=Graham7;11946868]
Originally Posted by Lyger
without the AFM the computer won't know how much fuel the engine needs, so yeah, surprised it even runs for more than a few seconds without it on the car.[/QUOTE


So would that explain why it's throwing so much fuel in for 4,000 rpms...?
anything is possible if a certain combination of issues exist.

but with everything proper, no, the car would stall due to a lack of fuel without the AFM installed.
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Old Jul 28, 2015 | 12:43 PM
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Ok so the TPS was responsible for the 4,000 RPMS but now it is stalling just as you say. So now onto that with the AFM
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Old Jul 28, 2015 | 03:15 PM
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High rpms..??

Originally Posted by Graham7
Ok so the TPS was responsible for the 4,000 RPMS but now it is stalling just as you say. So now onto that with the AFM
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