idle and running troubles...

[joebrent 0]

Hi all! :lol:

 

When I start the car using some throttle, it catches immediatley then the revs just drop and die. If i dont touch the throttle it starts after 3/4 seconds and idles at 500rpm for a bit, it should be at about 1000rpm though! occasionally when im driving the idle revs will rise from 1.5k to 2k, earlier today they were at 2k!!!

 

When I had my head gasket done a month or so ago, the car wasnt running right, the revs were bouncing from just about to stall to 1.5/2k and it was down to the cams being a couple of teeth out, is it possible they could of come out again??

 

All ideas appreciated :wink:

[Richie_FSOB 0]

Could be something to do with the mass air flow sensor, if the car has one.

I has ane escort that had the same symptoms as you describe, and it was a faulty sensor.

IE the engine isnt feeding the correct amount of fuel/air mix.

May be completetly off!

[Supercharged 2]

Have a search for 'ISV'

[joebrent 0]

Went for a run today, it started on the button with no gas and idled at 500 then up to 1000rpm, about 20 mins later it seems that when i dip the clutch to change gear the revs do not drop and sometimes even fluctuate. When i come to a stop the car doesnt want to stall, when i put the clutch in the revs rise to 1.5-2k at idle!! When i had finished my drive i let the car idle for a little bit and the revs would idle at 1.5k then in an exact rhythm, i.e, every 5 or 6 seconds the revs would drop a little then go back up to 1.5k?? Could it be that the cams have gone out again?

[Henny 0]

as Supercharged, says, do a search for ISV... these are classic symptoms of it... ;)

[joebrent 0]

Right....have cleaned up the ISV....No difference! What shall I try now??!! My mechanic has suggested an auto electrician look at it?

 

Cheers :cry:

[dr_mat 0]

scanned for error codes?

throttle cable isn't too tight?

You've checked that the throttle position sensor is ok (back to error codes..)?

[Kevin Bacon 5]

It's a 16V Matt.......so can't scan for error codes and neither does it have a TPS.

 

Definitely Idle valve. Replace it.

 

K

[dr_mat 0]

OOps, was under the impression joebrent had a VR..

[CazzaVR 0]

Give all of the hoses a thorough check. My first 16v used to do exactly this, and I found one of the ISV hoses was slightly split. Changed it for a couple of quid and 5 mins of my time and it was running beautifully :) 8)

[joebrent 0]

Is it worthless for an auto electrician to look at it then? can he get codes from anything else apart from vag-com? I dont wanna buy an ISV and for it not to work....Is their a way of defo knowing whats up before i buy an ISV???

[joebrent 0]

Anyone??

[dr_mat 0]

Um sorry, collective irresponsibility...

There's no codes to be read from your engine, AFAIK, so that was a red herring (from when I thought you had a VR..)..

You can check the operation of the idle valve - I've read on here that you stick a 12v supply on it you can see it open/close. If it's sluggish or struggling then the answer is clear.

[Kevin Bacon 5]

If you don't want to buy an ISV, at least try one from another car, or just buy the darn thing from GSF and take it back if it makes no difference.

 

From what you've described, it's definitely the ISV. Do you think an Autoelectrician will be cheaper than a new ISV??

 

Next time it revs all over the place, hit the ISV with a blunt object and it'll settle.

[joebrent 0]

I'm just gona buy the bloddy thing from gsf....I hope it works!!! If its on the car for literally one minute and it dont work will they be able to tell that its been fitted??

[Kevin Bacon 5]

Nah, I doubt it. Just claim you bought it for the wrong engine type by mistake...... although Stevemac works for GSF now, hope he doesn't see this :lol:

[joebrent 0]

Ok cheers Kev....If it dont work and i cant get my money back its all your fault!!!!!! :wink: :lol:

[Kevin Bacon 5]

LOL, can't hurt having a nice new one anyway!

 

Why not fit it outside the shop and ask them will they accept it back if it doesn't cure the problem? At least that way they'll see with their own eyes you haven't done 300 miles with it and chucked it about.

[dr_mat 0]

Flog it on ebay if it doesn't fix the problem.

If you're getting free advice (instead of £60/hr advice) take the hit on parts you buy just-in-case... ;)

[Kevin Bacon 5]

Yep that's what I do. If it doesn't sort the prob, oh well, in the cupboard it goes as a spare.

[joebrent 0]

When i fit it does anything else need adjusting?

[Kevin Bacon 5]

Nope.

[joebrent 0]

Just fitted a brand new ISV from german swedish........started her up and exactly the same :cry:

 

Revs were just fluctuating from 1500 to 2000 in a rhythm, getting pissed off with it now :evil:

 

The auto electrician will be checking it out tommorow, the mechanic thinks it may be an air leak, will keep everyone posted

 

Kev, You owe me £104 if german swedisd dont take it back :wink:

[joebrent 0]

all sorted now.....the idle screw on the fuel body had worked its way loose!!!!!!