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My R-33 Gts-t High Revs.

blitz r33
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blitz r33 Collaborator

blitz r33

Posted
Posted

hi,

my mate took off my rocker covers and painted them for a Christmas present but when we took off the intake pipe we noticed my throttle body was putrid so we took off the throttle body and the plenum plus the aac valve and gave it a very good clean.

we put it all back together but now my car revs at 1200-1300rpm even when the car is fully warmed up,it used to rev at 800rpm.

any ideas? any help to fix this problem would be greatly appreciated.

thanks.

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blitz r33 Collaborator

blitz r33

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Ive done what the guides told me,i warmed the car up and took off the brown plug that's connected to the aac valve and rotated the idle screw clockwise to decrease my idle but it only decreased by a fraction then i reconnected the plug.

in the thread it said to aim for 900rpm before reconnecting the brown plug but my car only went down to 1000rpm even with the idle screw nearly all the way in.

i even tried doing it how it said to in the other thread with disconnecting the TPS plug but ended with the same result.

so its at 1000rpm which is better then 1200-1300rpm.

but still shouldn't it go back to 800-850rpm where it was normally? i just don't know why it wouldn't go below 1000rpm?

any thoughts? last thing i want is to take it to a mechanic to charge me a fortune.

also i haven't messed with the idle screw on the ecu yet.

LotusGTR Veteran

LotusGTR

Posted
Posted

When my engine was re-built the builder clean my throttles. GTR throttles have a teflon coating which after many years of wear, plus the cleaning, no longer seal 100% hence the high idle. The carbon build up was probably sealing the throttle with its body. My idle screw is adjusted as far as it will go and the natural idle is 1400! but it's managed back to 1100 with the PowerFC. Not great but better than 1400. You can re-coat the throttle blades but this is (for me) a pain and expensive, so high idle it is....

That's my experience.

MBS206 Grand Master

MBS206

Posted
Posted

You have an air leak.

You've most likely broken the gasket either between plenum and AAC valve, or the TB and plenum, or you haven't reconnected a pipe properly.

Listen VERY closely for air leaks in whilst it's running, and use your hand to feel for them too.

superspit Mentor

superspit

Posted
Posted
You have an air leak.

You've most likely broken the gasket either between plenum and AAC valve, or the TB and plenum, or you haven't reconnected a pipe properly.

Listen VERY closely for air leaks in whilst it's running, and use your hand to feel for them too.

+1 air leak.

superspit Mentor

superspit

Posted
Posted
perhaps i am misinterpreting what you write.

but i do not like the way you wrote that.

what exactly did you mean?

yes...I think you have.

I am sorry if I offended you....this is not what I am here for. (ie.to offend)

The '+1' was referring to more ideas from fellow members for the user with the rev/idle issue.

I still believe it's air/vac related......(but want to know what it actually is!)...that's why I've asked for 'updates'.

I have put you down as a friend, I hope you reciprocate?

Spit.

blitz r33 Collaborator

blitz r33

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i will check for an air leak but they are really hard to find because of the fan and the noise of the engine,i might have to take the plenum back off to make sure he put the gasket on properly.

blitz r33 Collaborator

blitz r33

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any success with this issue mate?...updates?

i had a look around the plenum and intake pipes but there is that much air being blown around its nearly impossible to feel or hear for an air leak.

i had a listen at the back of the plenum and engine and there is a hissing noise but i don't know if that noise has always been there.

any ideas???

blitz r33 Collaborator

blitz r33

Posted
  • Author
Posted
When my engine was re-built the builder clean my throttles. GTR throttles have a teflon coating which after many years of wear, plus the cleaning, no longer seal 100% hence the high idle. The carbon build up was probably sealing the throttle with its body. My idle screw is adjusted as far as it will go and the natural idle is 1400! but it's managed back to 1100 with the PowerFC. Not great but better than 1400. You can re-coat the throttle blades but this is (for me) a pain and expensive, so high idle it is....

That's my experience.

i think your right,i just read on a site cant remember what its called something bout skylines & GTR owners but there was a topic basically the same as mine and alot of them have the same problem after cleaning their throttle and plenum.

they say there is a seal which was covered with shit & they cleaned it but didn't realize they were cleaning off the seal as well and when put back together = in 1200rpm+ even with the idle screw all the way in.

did you know how much it will cost to fix? is it really expensive?

Silent Shadow Rising Star

Silent Shadow

Posted
Posted
i will check for an air leak but they are really hard to find because of the fan and the noise of the engine,i might have to take the plenum back off to make sure he put the gasket on properly.

1. cut 3 ft of garden hose from the side of you house (or neighbors).

2. stick one end in your ear and use the other end to source the leak sound!

you now have a budget stethoscope ;-) i actually learnt this when i was an apprentice mechanic for jaguar lol...

  • 1 month later...
joeleo87 Experienced

joeleo87

Posted
Posted
When my engine was re-built the builder clean my throttles. GTR throttles have a teflon coating which after many years of wear, plus the cleaning, no longer seal 100% hence the high idle. The carbon build up was probably sealing the throttle with its body. My idle screw is adjusted as far as it will go and the natural idle is 1400! but it's managed back to 1100 with the PowerFC. Not great but better than 1400. You can re-coat the throttle blades but this is (for me) a pain and expensive, so high idle it is....

That's my experience.

god damn it!!!

my GTR has always idled high as - 1300-1400, tried everything. just got a powerFC and was hoping it helped the idle :( negative lol.

my tuner said he had expended every option except checking the throttle bodies for the coatings.

he also said the to get the idle back down to normal 800~ it would be expensive as!

its at about 1100 now but with my powerfc it hunts a fair bit. it will have to do lol

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