Revving on startup - Engines Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Revving on startup

lotek

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Location: Berkshire

Registered: 04 Dec 2007

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Post #1

I attempted to start the rallye today and whats happening is

it starts, splutters a lil then revs up to like 2-3k and stays there?

we changed the ICV and it still does it.

the only noticable things i can see is the TPS has oil sitting in it, if you unplug it then start , it just revvs up straight away, where as if its plugged in it will run then revv up?

if i plug the ICV pipe with thumb or throttle body it will stall he car?

I am on the verge of breaking both cars for spares.....

Posted 9th Jan 2011 at 23:11

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lotek

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Post #2

bump of urgency.
i have a couple hours i can spare on car tomorrow then i need to go back to work and thats it for progress

Posted 9th Jan 2011 at 23:15

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #3

had the fanimold off at all?

high revving with closed throttle screams air leak of some sort, either buggered ICV or inlet manifold gasket, or split resonator.

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Posted 9th Jan 2011 at 23:40

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lotek

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Post #4

i fitted inlet with a PTFE gasket Yes

it will sometimes run for a few seconds Then rev up , other times splutter then rev up Sad

if i plug the TB or IVC it will suck on my hand then stall.

Could it be the TPS?

Posted 9th Jan 2011 at 23:44

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phillipm

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Post #5

^What he said.

It's got to be an air leek/weep somewhere. Did the old gasket come off cleanly, no debris/muck under the gasket?
As per the other thread, it can help to seat the gasket into scratches/debris/etc if you overtorque the bolts by a few lbft and then slacken and re-torque them.

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Posted 9th Jan 2011 at 23:48

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lotek

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Post #6

the old gasket left a right ol mess so i scraped it off and fitted manifold,

so is it safe to say its not the TPS or MAP thats the culprit?

Posted 9th Jan 2011 at 23:49

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phillipm

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Post #7

I don't think it'd have enough air to hit 2krpm, although it does seem strange it stalling completely with the ICV plugged, usually if it's got that much air you'd hear it with the ICV/TB plugged.

Worth reseating it and seeing if it changes anyway.

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Posted 10th Jan 2011 at 00:03

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mechanical_repairs

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Post #8

Mei has it spot on, the car is getting un metred air so is revving up on that.

Carl

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Posted 10th Jan 2011 at 00:02

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stan_306gti6 Forum Admin

Location: Kent

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Post #9

Agreed, I say the manifold has to come back off if it has just been installed and everything checked and reinstalled. Yes

Stan.

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Posted 10th Jan 2011 at 00:03

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lotek

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Post #10

ok tomorrow i shall
tighten manifold more, prime a few times to ensure icv position and see what happens i suppoese ,

its soo disheartening Sad

Posted 10th Jan 2011 at 00:10

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #11

plugging the ICV in my experience always stalls the engine even if there is an air leak, there's a surprising amount of air going through them.

is the valve present in the oil breather to the head and are the other breather pipes intact?

just thinking aloud what else it could be other than ICV or gasket or resonator, not much!

Don't go mad on tightening the bolts up more as the PTFE gaskets are a lot thicker than the o.e paper type, which means less threads in the alloy head for the bolts to grab.

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Posted 10th Jan 2011 at 00:15

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lotek

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Post #12

the oil breather from head is going to Catch tank,

pipes on TB are Plugged temporarily

Posted 10th Jan 2011 at 00:15

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phillipm

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Post #13

Yeah, don't go FT on the bolts, just another couple of lbft to try and seat it, usually if it's the gasket the slackening and re-torque sorts it out

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Posted 10th Jan 2011 at 00:17

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lotek

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Post #14

ok shall do ,

if loosening them and re tightening doesent work then whats the next port of call?

the TPS wont cause this no ?

Posted 10th Jan 2011 at 00:38

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ryangti6

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Post #15

lotek wrote:

ok shall do ,

if loosening them and re tightening doesent work then whats the next port of call?

the TPS wont cause this no ?

Do what stan has said and check everything.

If you want to try and locate the actual leak you can spray some carb cleaner or a mist of water around the mani area and see if the revs change.

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Posted 10th Jan 2011 at 02:13

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Rich E Forum Admin

Location: Hertfordshire

Registered: 27 Apr 2005

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Post #16

Just picked up your PM Rick, I concur it's most likely to be an air leak somewhere.

I had a similar issue when I had a small gap in the inlet to TB gasket. Check the TPS wiring too, I've also had these symptoms when one of the TPS wires broke.

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Posted 10th Jan 2011 at 18:06

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lotek

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Post #17

well it seems to have been the inlet manifold Yes

its idling nice now Smile

revs sometimes take a lil while to drop if yo blip throttle but i put that down to IVC being dirty, tight throtle cable, and no air filter on.

all in al tho its good! thanks for help Thumbs up

Posted 10th Jan 2011 at 18:10

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