19 16v slows down do much

Newbie Joined: 24 Jan 2005 Posts: 14

ok this is basicly the problem when i ease up on the accelerator to keep the speed the same the car slows down to much much more then nomal like its just run out of petrol but if i press the accelerator againg its seems to be fine it runs just as it always has apart from its a pain if im folowing some one any help will be grate full

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

your brakes may be sticking, caliper seized and applying a slight braking force all the time.

jack up the wheels one at a time and see if they spin freely with the brakes off.

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

drive it as normal and then touch each road wheel. The rear ones will be coller than the fronts and should be equal in temp, if one is roastign then its siezed.

Same with the fronts.

Also what car is it as we can advise further when we know what car it is.

Retroholic Joined: 12 Feb 2004 Posts: 5685

I think its a 19 16v matey...

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

yes that would be the answer due to the title, I really should have read it lol!

Well its discs all round so look for sticking sliders/seized pistons.

Newbie Joined: 24 Jan 2005 Posts: 14

na its an enging problem i no the difrence between the car braking and the enging braking its just like i have run out of petrol then press the make me go foot thingy and it will pic up and its not every time but it seems to be promanant at about 2/3 thou revs
i was wondering if a sensor has gone some where

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

well on all injection cars when you release the throttle the fuel injectors stay closed so zero fuel goes in to the engine until the over run fuel cut off disengages which shoudl happen around 1500rpm.

Newbie Joined: 24 Jan 2005 Posts: 14

but it never run like this in 2 years of ownin it .its only started in the last 3 weeks

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

could even be a duff mount. Mine is the same cos the back mounts gone. Back off it keeps going then clunk as the engine shifts it starts slowing as normal.

Newbie Joined: 24 Jan 2005 Posts: 14

could my road speed sensor be up the duff and it thinks i have stoped when im just roling along some one said map sensor but as i dont no where to find it i got no idea
can i test the map sensor ?
can i test the road speed sensor ?
dose my car have them ?
and where do i find them ?
its a phase 2 btw

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

Yes they have them.

Map sensor if you look in the megane K7M running problems tech article you will see the map sensor, same position and type as the 19.

Raod speed sensor, when your rolling along and dip the clutch does the engine stay slightly above idle then when you stop drop down to idle speed?

Newbie Joined: 24 Jan 2005 Posts: 14

best was to discribe it is its like taking my foot of the pedel when i have only lifted it up about 5mm to level out the speed

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

throttle position sensor then, at low throttle angles they can get arsy, I thought you meant when backing off totally.

Newbie Joined: 24 Jan 2005 Posts: 14

ok took for a drive today it was hard to satrt keped cuting out in sted of idaling after satrt but once warm not a problem with idle except it keped going up and down between 1000 ans 1100 revs took her for a drive and when i press in the clutch (and am still moving )the revs do drop to idle speed being about 1000 or 1100 revs i could not cruise at all in second about 2100 revs inles i put my foot right down and under acelaration it was fine it just refuses to sit at one constant speed

btw thank you for all your help so far hope i can sort it out fast as my missis is about to drop a baby like any day kind of nead it for the hospital run (alwasy pics a bad time)

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

I had a similar problem. Not long ago.

The connector to the throttle position sensor was loose, it basically made it cut out and more to the point rev up and down, I just thought the lambda had finally gone as the car had sat for a month or 2 not used.

Checked it and the plug just fell off. Plugged it back in and it was fine again. Might not be your prob but worth a look.

Newbie Joined: 24 Jan 2005 Posts: 14

ok just looked it al seems fine the never tries to speed up just slow down can test any parts like the
map sensor ?
lamda sensor ?
roads speed sensor ?
throttle position sensor ?

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

TPS can be teseted with preferably swinging needle multimeter, just make sure the needle moves slwoly as the throttle opened, if it drops to 0 then shoots back up its pretty much past it.

Map sensor, make sure the pipes clear and not burst. As for testing you cvan't really on a diy basis unless you have another to swap with it.

Road speed sensor like I said the revs should stay up with the clutch dipped and the car rolling.

Lambda sensor, unplug it and see if the problem goes.

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

mine doesnt keep revs up if coasting with clutch down....

it does the drop to 1400ish then settle to just under 1000

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

well it should

mine only does it sometimes. Other times it drops straight to idle which is about 900rpm.

Mr Quoter-vator Joined: 16 Feb 2004 Posts: 7405

before i changed my stat and rad switch for std ones, i always used to have to blip the throttle when putting clutch down and braking as if i didnt it would nearly always try and cut out.

since changing them it simply acts perfectly...drops like i said and settles...still gettin used to not havin to blip throttle...

why do u think that was? i cant see connection....works as it should right from cold start....

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

Well the management is perfected around a certain temp range so to cold and it will run crap.

Before I fitted a stat to mine it was the same, then I used chamadyelooks old stat then got as new one eventually after it died.

Best benefit for me was the major hike in fuel economy!