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Rb25 Problem

PIG747

By PIG747,
in Engines & Forced Induction

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PIG747 Mentor

PIG747

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Posted

Hey guys,

Just after some help with my current problem.

When I drive my car and go over 5000rpm the revs hold up. When its in gear it will hold the revs say at 4000rpm and when I engage the clutch it will redline. It does this for a few seconds then goes back to normal.

When this happened last I put my foot behind the pedal and it was all the way up.

I've checked if the throttle cable is jamming and I can't fault it when the car isn't moving.

Cleaned the AAC

Cleaned the throttle body

What else can I check? I'm lost at what it could be.

Mods are:

Greddy plenum

Hypertune throttle body

3037s

Injectors

Power fc

Z32

It had all this work even before the problem started. And sometimes it won't happen

Thanks for your help

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https://www.sau.com.au/forums/topic/421902-rb25-problem/
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PIG747 Mentor

PIG747

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Possible TPS fault. If you can get a commander hooked up to the ECU, look for TPS voltage to drop to <0.5 V as you close the throttle.

Also you need to look for vacuum leaks and watch the ignition timing. If it is unusually high, that may cause a big rev too.

Thanks mate, ill check the tps

I don't think it would be a vacuum leak because it doesn't happen all the time

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https://www.sau.com.au/forums/topic/421902-rb25-problem/#findComment-6787956
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PIG747 Mentor

PIG747

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I changed the tps and the problem is still occurring.

I took the throttle body off and it still looks good. Sat there for a while opening and closing it and never jammed.

While I was out testing the problem again I would dab the throttle when it was keeping the revs up and it would stop.

I'm going to have a look at where the throttle cable joins the pedal and see how I go.

Wish me luck

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