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Old 28-07-2017, 02:09 PM   #1
Bennjamini
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Default Honda B series High Revving on start up

Alright folks,

I literally just connected a new battery to my B18C4 conversion and attempted a quick start up - the first time in almost 10 years of project - and it sputtered into life after a few turns, but it almost immediately started to increase dramatically in revs, as if I'd opened the throttle up to max,

throttle is not connected, so the body/throttle plate would have been in idle position,

- standalone engine loom converted by VDM Motorsport
- Not yet filled coolant , don't know if this would have an effect (on idle sensor?)
- I have recently changed cam-belt, flywheel,clutch
- Standard P9K ECU
- All sensors are in, including O2 sensor, exhaust loosely fitted
-



To be fair I didn't give it chance to settle down, and just cut it off immediately, didn't wait to see if it would drop to idle - I was on a flyer on my lunch break so I've left it now will try again tomorrow,

In meantime, as I'm very nervous/excited about it all for some reason (10 years!), does anyone have anything to suggest that would cause an over-revving, even with throttle closed?
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Old 28-07-2017, 02:35 PM   #2
geachy87
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Must be an air leak at the inlet manifold somewhere, have you left any vacuum lines off? If you're not using a servo have you blanked off the part on the inlet for it?
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Old 28-07-2017, 02:55 PM   #3
Bennjamini
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Quote:
Originally Posted by geachy87 View Post
Must be an air leak at the inlet manifold somewhere, have you left any vacuum lines off? If you're not using a servo have you blanked off the part on the inlet for it?

I have switched the huge std C4 inlet to a skunk2, so I may have connected a vacuum up to wrong place

However servo 'hole' is definitely blanked with threaded bar

the crankcase breather box is still there, but I just have a pipe running off to nothing - I think this would've normally connected up to the IAB box beneath the std C4 intake?


I know the only other bit without something connected is the small 3-4mm pipe coming off the top of the throttle body, which I believe normally went off to the charcoal canister - which I have deleted completely from the system.

Is any of this likely to cause an issue?
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Old 28-07-2017, 03:02 PM   #4
geachy87
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Blank off the pipe that the charcoal canister went to and try it again, it'll be drawing air in through that if it's not blanked already
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Old 28-07-2017, 03:07 PM   #5
Bennjamini
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Quote:
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Blank off the pipe that the charcoal canister went to and try it again, it'll be drawing air in through that if it's not blanked already
Will do, thanks very much for this,
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Old 31-07-2017, 07:27 PM   #6
geachy87
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How's it going? Have you found the problem yet?
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Old 03-08-2017, 04:05 AM   #7
Bennjaminozhonda
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Everything needs to be connected , firmly installed and alll fluids at optimum for he car to hold cold start idle

Check your FITV or icav located on the throttle body and back of the inlet mani. these can get gunk inside and block giving high revs

also , is your throttle cable connected ? might be stuck somewhere in the engine bay

also if the tps and map sensors aren't swapped
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Old 05-08-2017, 09:44 PM   #8
UKMinis
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Have you checked the gasket between the throttle body and the inlet manifold?
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Old 07-08-2017, 11:19 AM   #9
miniphil30
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Quote:
Originally Posted by geachy87 View Post
Blank off the pipe that the charcoal canister went to and try it again, it'll be drawing air in through that if it's not blanked already
Mine did this, not max revs but idled at 3k. It was this above. I'd plumbed the crankcase breather into the inlet manifold as that's where it used to go. However the crankcase breather goes into the air flow before the throttle valve on a std inlet so will need venting to atmosphere on a Skunk 2. If that makes sense?
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