172 phase 1 over revvng

[richardharbord]

I bought the car on ebay! A really nice car for eight years (its now done about 130,000) until I left it over christmas, now is sounds like a galopy. I have had a lot of work done on it and for this particular issue I have changed one set of injectors (indicated to be low by the ECU analysis), all plugs, HT leads and coils and had the butterly cleaned. But still the engine has less power and knocks as if one of the cylinders isn't firing properly or is incorrectly timed. Also the exhaust futs in a way it never has before, used to purr. But most annoying is the throttle, which stays revved high until you rev it and then it returns to idle when you again hear the knocking when accellerating. Still after all this work it sounds like only three are firing, it goes up hills but "you have to change down!" and the fuel efficiency is through the roof! Can anyone help me please, I don't have much money and cannot afford Renault but I need it everyday and I am on the verge of giving up and buying a Mondeo (nightmare).

Help me please, I love this car!

 

[Korky]

It sounds like you could have a few problems, one being a mis-fire and one being a sticky throttle body.
if your not going to plug the car in to find the fault then you could start replacing components sensor by sensor for example coilpack then plugs then leads then lambda then crank sensor etc.

To fix a stickey throttle body there is a guide on here but a quick step through it is remove from manifold, strip down throttle body, clean and grease spring, reassemble. If that doesnt fix the throttle body then you could have play in the shaft causing it to stick, if it isnt the throttle body causing the revs to stick it could be icv.

Hope this helps.

 

[richardharbord]

Thank you very much for the suggestions, I agree that it might have a lot to do with the sensors as it all started, as I said, leaving the car in a cold and wet carpark at the airport! I will investigate your recommendations. My accelerator has always stuck intermitently but never as badly as it has been recently so I will investigate the sensors and throttle body further. However, I wondered whether the firing and performance problems might be the cambelt dephaser. My car has always screeched on full lock (alternator belt) and my engineer felt that I may have also slipped the cambelt on a bump or something, but he said this was illogical so maybe the dephaser (not sure what a dephaser does) is the problem.

 

[richardharbord]

To continue the story with some successes... I had the injector replaced on two for 250 quid BUT my engineer "dropped a van door on the side of my car" and left a dent big as a CD in the door!, which he then tried to beat out! So I left them, never to return, and went to Renault who have replaced another injector (on three) 250 quid but this time it fixed it!, at least for the timing! Great! The car is almost back to it's usual self overtaking uphill Ha Ha!

However, when you put your foot on the clutch the revs still either shoot up or stay high so I am going back in to Renault for a test drive to show them the problem. Any ideas about what it could be? Sensor, lambda sensor I hope?

 

[Andyman]

Did i read that right - £250 to replace a injector?

 

[dann2707]

To continue the story with some successes... I had the injector replaced on two for 250 quid BUT my engineer "dropped a van door on the side of my car" and left a dent big as a CD in the door!, which he then tried to beat out! So I left them, never to return, and went to Renault who have replaced another injector (on three) 250 quid but this time it fixed it!, at least for the timing! Great! The car is almost back to it's usual self overtaking uphill Ha Ha!

However, when you put your foot on the clutch the revs still either shoot up or stay high so I am going back in to Renault for a test drive to show them the problem. Any ideas about what it could be? Sensor, lambda sensor I hope?

Please tell me that was supposed to be 25 not 250?

 

[Ph1 Tom]

Its a Weber injector. £35 from ECP and about £100 from Renault for the same part! Then add the £100+vat or whatever they charge per hour...

 

[richardharbord]

Actually, the price at my local engineers was over a hundred for the part, about sixty at Renault, plus VAT, then the cost of the labour, use of diagostic and other messing about. Incidentally, the injector was highlighted by the diagnostic but my engineer misinterpreted the computer and read the cylinder number from the wrong end and therefore replaced the wrong injector, so replacing the plugs, leads and the coil and the first injector as all a waist of time and money, so I should have gone to Renault in the first place. BUT my clio starts and runs well now but still revs high when you put the clutch in. I am taking it back into Renault on Tuesday and any advice would be very helpfull.

 

[joebloggz]

I changed all 4 for £122 in 30 mins .think you need to change your mechanic as well .:spanner::nut::car:😊

 

[JackD]

So you've paid over £500 for 3 injectors? If you'd only posted on here first you would have been pointed to your nearest specialist who wouldn't have pulled your pants down and taken the piss.

 

[DannyR]

The funny thing is the over revving wouldn't even be produced by the injectors, only maybe if a 5p o ring wasn't seated correctly.

You've got an air leak or a sticky throttle!

 

[richardharbord]

Yes over revving now better, there was an air leak in a sensor and the butterfly was sticking, all sorted by Renault. And yes, an expensive month on my car, which I could have avoided if I had gone to specialists first. Lesson learnt. I love my car. Fuel consumption still not back to previous level and engine idles a little higher than before. But it runs very well. I suppose I'm happy enough now, thanks for all your help and moral sipport!

 

[Diagro]

Wow, and i thought i had problems lol

It cost me £35 to replace all 4 injectors with 100 Mile old ones and No labour as i did it my self.
And you have been charged £500 for 3??

You should have come to me, i have an RS tuner for diagnostics and i have like 8 spare injectors I would have been happy to charge you £500 for the time

 

[JackD]

Yes over revving now better, there was an air leak in a sensor and the butterfly was sticking, all sorted by Renault. And yes, an expensive month on my car, which I could have avoided if I had gone to specialists first. Lesson learnt. I love my car. Fuel consumption still not back to previous level and engine idles a little higher than before. But it runs very well. I suppose I'm happy enough now, thanks for all your help and moral sipport!

As long as you learn from it, I'd always have a search on here before paying anyone to do work or at least take it to a trusted trader.