So I call Renault direct...

[-Sparky-]

So I call renault direct, for a quote on 4 new injectors for the 172. Expecting about £20 a piece as I have read on this forum that's reasonable price...

The guy comes back with £67.91+vat! Each!

Is this correct or are renault charging way too much. I am not paying that for them and I have seen them brand new on eBay for £30 a piece.

 

[Dave..]

Whoever told you that £20 for a brand new injector is a reasonable price, is lying.

 

[Gray]

Whoever told you that £20 for a brand new injector is a reasonable price, is lying.

This.

 

[Carbonraider]

Sound about rite.. thats why i sent you a pm. The ones on ebay you seen for 30 are recon

 

[-Sparky-]

Oh! Well that's annoying, looks like I am going for the recon ones then.

Thanks for clearing that up.

 

[Dave..]

Why are you after 4 new ones by the way?

 

[-Sparky-]

Why are you after 4 new ones by the way?

One has failed and I have decided to change all 4 at the same time

 

[Dave..]

If only one has failed, you only need to replace that one?

That's all I did anyway. Plugged it in, found which injector was at fault, changed injector, job done.

 

[-Sparky-]

If only one has failed, you only need to replace that one?

That's all I did anyway. Plugged it in, found which injector was at fault, changed injector, job done.

Yes I know but for piece of mind I want to replace all 4

 

[Rob]

I wouldn't worry, it's not really like spark plugs or whatever.

Just change one, if another goes in 6 months, just change another. It's that simple, and it's not like one failing will cause the car to explode.

 

[-Sparky-]

I wouldn't worry, it's not really like spark plugs or whatever.

Just change one, if another goes in 6 months, just change another. It's that simple, and it's not like one failing will cause the car to explode.

Ok well I am getting a quote for 4 then I will decide, I have just changed the plugs leads and coil pack

 

[Gray]

You just can't tell some people!

one failed injectors means you replace one, not all of them.... There is no need to do that!

 

[Dave..]

You just can't tell some people!

one failed injectors means you replace one, not all of them.... There is no need to do that!

Wait... only one? Not all 4?

 

[danzman1991]

I'd replace the broken one and the one to the left of it, leave the other two well alone.

 

[-Sparky-]

I understand completely that I only need to replace one but I know that the car will run far better with 4 new injectors than just 1.

It is not your money being spent so why the need for some people to take the piss.


Thanks for your help.

 

[Dave..]

The car wont run any better by replacing all 4. Because the other three are already working.

You've also started this thread off complaining about the price of 1 injector, yet after being told you only need to replace one, you're still wanting to pay for 4? We're trying to help!

 

[Addicted]

CS Logic at it's best again, asks for advice, ignores it.

FLOL @ Buying 4 when only 1 is broken, there's no gain if they work fine..

 

[Rob]

If you were running boost and 300 bph I'd agree a whole set of injectors may be of some merit, but I can't be bothered to type any more and give up.

 

[@Spoonie]

My car runs better on 4 new tyres. If i get a puncture i don't replace all 4. Madness.

 

[-Sparky-]

If you were running boost and 300 bph I'd agree a whole set of injectors may be of some merit, but I can't be bothered to type any more and give up.

Thanks for your help, I am only going to buy one injector.

 

[Tunst]

You just can't tell some people!

one failed injectors means you replace one, not all of them.... There is no need to do that!

Unless its a megane you everyone tells you to change all 4 :rasp:

 

[Gray]

Unless its a megane you everyone tells you to change all 4 :rasp:

Because boost iirc.

I guess its because The megane injectors run higher duty, especially when people have mapped.

 

[ben lee]

it is better to replace all 4 as over time they get dirty and flow rate will reduce and change the spray pattern meaning the injector has to work harder.

 

[jenic]

it is better to replace all 4 as over time they get dirty and flow rate will reduce and change the spray pattern meaning the injector has to work harder.

You can get them cleaned fairly cheaply, about a tenner each.

 

[Xanda73]

I had an intermittent misfire that was down to a failing injector - this was replaced with a second had one. A few months later another (different) injector started doing the same thing. I replaced all 4 and the car felt a lot better to drive and definitely had more power, it honestly did, so I would say change all 4 if you want - it made my car a lot better. The idle was smoother too. It did however lower the economy a couple of mpg but I put that down to the increased power.

Euro Car Parts

Fuel Injector 431745200

£187.20

 

[-Sparky-]

I can get a full set for £115, I have ordered the one so far to replace the faulty one. The reasons I was going to get all 4 is because of what's stated in the last few comments above.

Ovbiously that's not what very body does on this forum that's why I got so much stick for saying I wanted to buy all 4...

 

[Dan519]

Unless its a megane you everyone tells you to change all 4 :rasp:

Because boost iirc.

I guess its because The megane injectors run higher duty, especially when people have mapped.

no, it's becuase they revised the part on the megane. Brown ones were poor, blue ones are the updated version

 

[The Fatty]

it is better to replace all 4 as over time they get dirty and flow rate will reduce and change the spray pattern meaning the injector has to work harder.

I had an intermittent misfire that was down to a failing injector - this was replaced with a second had one. A few months later another (different) injector started doing the same thing. I replaced all 4 and the car felt a lot better to drive and definitely had more power, it honestly did, so I would say change all 4 if you want - it made my car a lot better. The idle was smoother too. It did however lower the economy a couple of mpg but I put that down to the increased power.

Euro Car Parts

Fuel Injector 431745200

£187.20

I don't see how changing a 'working' injector will provide any gains tbh.

 

[ben lee]

I don't see how changing a 'working' injector will provide any gains tbh.

over time the injectors get deposits build up that reduce its performance.
if injectors have different flow rates then they will be spaying different amount of fuel to each cylinder so giving each cylinder a different AFR. if you have one over fuelling and one under fuelling the engine takes an average AFR reading of all cylinders via the lambda or map setting. over fuelling or under fuelling can loose power. and if really bad can kill an engine .

if the spray pattern or solenoid response is effected it wont spray fuel as a mist so wont atomise with the intake air and give a clean burn so loose performance.

injectors should be within 10% tolerance of each other not to cause any problems on a road car on a race engine it would be a tolerance 3% tolerance.

 

[Gray]

no, it's becuase they revised the part on the megane. Brown ones were poor, blue ones are the updated version

And that

 

[-Sparky-]

over time the injectors get deposits build up that reduce its performance.
if injectors have different flow rates then they will be spaying different amount of fuel to each cylinder so giving each cylinder a different AFR. if you have one over fuelling and one under fuelling the engine takes an average AFR reading of all cylinders via the lambda or map setting. over fuelling or under fuelling can loose power. and if really bad can kill an engine .

if the spray pattern or solenoid response is effected it wont spray fuel as a mist so wont atomise with the intake air and give a clean burn so loose performance.

injectors should be within 10% tolerance of each other not to cause any problems on a road car on a race engine it would be a tolerance 3% tolerance.

Thank you for this helpful information.

So all the agro I got for wanting to replace all 4 because i knew the car would run better was unnecessary.


my views on some of the posts I read on this forum are pretty patronising and if it's something that's not the norm with the guys that are always on here they all jump on the bandwagon.

 

[Rob]

There was no patronisation mate, it's just people giving you advice to stop you pissing money up the wall.

In a super highly tuned track car you might gain 0.001* of a second per lap due to having 0.000006ml* more fuel making it through your injectors but in a road car you'd get better overall results by changing something such as the gearbox fluid that might not have been done in a while.

*all figures are approximate

So yeah, it's your choice, it always was, but as many have said, on the megane's they advise changing them all because the part was upgraded by Renault, on the Clio's, just changing one is fine.

 

[Sunglasses_Ron]

over time the injectors get deposits build up that reduce its performance.
if injectors have different flow rates then they will be spaying different amount of fuel to each cylinder so giving each cylinder a different AFR. if you have one over fuelling and one under fuelling the engine takes an average AFR reading of all cylinders via the lambda or map setting. over fuelling or under fuelling can loose power. and if really bad can kill an engine .

if the spray pattern or solenoid response is effected it wont spray fuel as a mist so wont atomise with the intake air and give a clean burn so loose performance.

injectors should be within 10% tolerance of each other not to cause any problems on a road car on a race engine it would be a tolerance 3% tolerance.

Just out of curiosity, are you the same person who took payment for a sat nav and then then didn't bother sending it?

If you're not I apologise, its just I read something recently on here and I'm sure it was your name all over it.

 

[Ol’ Tarby]

Just out of curiosity, are you the same person who took payment for a sat nav and then then didn't bother sending it?

If you're not I apologise, its just I read something recently on here and I'm sure it was your name all over it.

yes mate I think it was

 

[Sunglasses_Ron]

I thought so

 

[...]

I thought so

Speaking of which is it time to post aron a soap on a rope yet .... been on hols so trying to catch up

 

[-Sparky-]

Fitted my new injector to replace the one that was faulty in cylinder 2, I only ordered one as you guys insisted replacing the others was pointless. 5 minutes after fitting the new injector and going for a drive the Injector in cylinder 1 has now packed up!

This Cars nothing but a headache!

Ordered 3 more from renparts tonight so I will have a new full set, great service and a nice discount too.

 

[TonkaTruck]

I'd replace the broken one and the one to the left of it, leave the other two well alone.

...Glad it's sorted at least.

 

[-Sparky-]

...Glad it's sorted at least.

Replacing the faulty injector 2 and injector 3 wouldn't have stopped injector 1 failing?

Or am I reading his post wrong?

 

[Xanda73]

Fitted my new injector to replace the one that was faulty in cylinder 2, I only ordered one as you guys insisted replacing the others was pointless. 5 minutes after fitting the new injector and going for a drive the Injector in cylinder 1 has now packed up!

This Cars nothing but a headache!

Ordered 3 more from renparts tonight so I will have a new full set, great service and a nice discount too.

This is what happened to me (and what I reported above).

This is why I replaced all 4. They were all original and so nearly 12 years old afaik, and I guess from the results after, one of the reasons old(er) cars lose performance.