Destructive misfire help..

[Stu-]

As title says, my car has a slight misfire at low revs. I've changed the coil pack, spark plugs and leads and it's still there. What should I be looking at changing now? It's got me frustrated. Its not bad but I know its there.



Any help would be great. Cheers.

 

[r900smp]

I have this issue and have had for about four months :-D changed a
Coil pack! Issue still there :-S

 

[Dave..]

Injectors

 

[JackJack]

Injectors

+1 imo get it diagnosed properly though instead of just chucking money at parts.

 

[Stu-]

+1 imo get it diagnosed properly though instead of just chucking money at parts.

I've had it diagnosed and was told the likely hood was coil pack/leads.

Is there anyway of checking the injectors?

 

[JackJack]

I've had it diagnosed and was told the likely hood was coil pack/leads.

Is there anyway of checking the injectors?

Oh right. I think you can do it by unplugging the injector connector and see if it gets worse, whichever one has no effect indicates the one at fault iirc. I'd get someone to clarify that first though.

 

[Stu-]

If it was the injector, wouldn't it misfire all the time? It only does it at idle and pulling away speeds. Normal driving ect is fine. It's got my head battered.

 

[Andyrg@ ClioTurbo]

i have several injectors if you wish to pop over and ill swap the rale ??

 

[Stu-]

That'd be cool Andy! See you've got a new project, going to be as awesome as the last one?

 

[Andyrg@ ClioTurbo]

no probs worth checking before u spend money

 

[Russ_16v]

Just checking, have you fitted the right plugs? I had the same, 'distructive misfire' when I was forced to fit Bosche super 4's

 

[Ricardos]

O2 sensor

 

[Stu-]

Just checking, have you fitted the right plugs? I had the same, 'distructive misfire' when I was forced to fit Bosche super 4's

Yes, ngk pfr6e-10. It did have Bosch but binned them off ages ago.


Ricardo, before or after cat? Or just try both?

 

[Russ_16v]

Before cat mate, though they are both the same, the post cat has a longer wire from memory, you can actually swap them round to see if it makes a differnce

 

[Ricardos]

Well with mine it idled ok and drove ok on light throttle cruising but on full throttle it misfired slightly, rear sensor. I'd say have them tested, could try swapping them. CLIP should give you a reading on the sensors

 

[Stu-]

It's odd. Only when idling or gentle throttle. But normal driving is fine, no hint of a misfire. I've got a mate coming round tomorrow to try another 02 sensor. Then I'll try the injectors with Andy if that doesn't work I give up haha.

 

[Sean6545]

Injector. Remove the plugs and see which one is black and carboned up. That's which cylinder has the fault

 

[Stu-]

There wasn't one that was any worse than the others tbh. I've put brand new ones in so I'll check them again tomorrow when I've driven it back and forward to work.

Hopefully it isn't anything too serious.


Cheers for the advice everyone. I appreciate it.

 

[BlakeTillz]

This is the exact problem my clio 1.2 16v is having at the minute, just happens when starting up, pulling away in first gear and second gear low revs. im changing my coil pack, ht leads and spark plugs tomorrow to see if that does the trick.

 

[ND04]

I've got injectors aswell if you need them stu you can have them i'll drop them in for you if you want save's a drive to Andy's

 

[Stu-]

Yeah cheers mate. I'll reply to your pm.

 

[DTM]

has your timing been checked, also tdc sensor is a likely candidate.

 

[Stu-]

If the timing was our it wouldnt drive normally at speed? Tdc could be a good shout.

 

[DTM]

I only say about the timing as mine is out on the inlet and has an occasional misfire on low rpm / set off / cold + rough idle but is fine when driven above 1.5 - 2k rpm.

before knowing about the timing I've replaced coil pack, leads, plugs, MAP sensor, O2 sensor, air temp sensor and tdc, but still have an issue, so setting the timing is next. (p.s. some of those were replaced due to it running rich when I first got it)

 

[Stu-]

The timing belt and dephaser were done about 3 month a go and it's been fine up until about a week a go. I'm running out of ideas now lol.

 

[Stu-]

Good news gents. New injectors seem to have cured it.

Cheers for all the pointers. Hopefully it'll be alright for a while now.

Thanks to ND04 for the injectors. I owe you mate!

 

[ND04]

Just pleased i could help mate glad its sorted.

 

[r900smp]

Out of interest anyone know the trade price for new injectors for a 182 from Renault?

Sam

 

[Andyrg@ ClioTurbo]

i guess i best not leave work early tonight then! Cheers for letting me know :/

 

[Stu-]

i guess i best not leave work early tonight then! Cheers for letting me know :/

Been mega busy with work mate. Sorry. Cheers for offering to help though, I appreciate it!!

 

[Dave..]

Good news gents. New injectors seem to have cured it.

Cheers for all the pointers. Hopefully it'll be alright for a while now.

Thanks to ND04 for the injectors. I owe you mate!

Injectors

God I'm good.

 

[Stu-]

Haha! :clap:

 

[TGee]

How can you check the injectors? Can you just unplug like you do with the leads?

 

[Stu-]

at a guess, you can. But i just changed all of mine without checking them.

 

[paulindor]

at a guess, you can. But i just changed all of mine without checking them.

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my car has a misfire when it idles also!will a snap on computer or any computer show an injector fault?

 

[Dave..]

Yes, a snap on computer will show an error along the lines of "Circuit fault on injector X"

 

[15MAS]

I am getting a misfire, my car has been in the parked in the garage since last August. Have a track day on Tuesday so thought I better get it out to check it over and it's misfiring. I have checked the following:

No water in plug wells
Spark plugs are correct NGK R all appeared OK and less than 14k miles old
Plug 4 was more sooty and cleaned
Leads original renault and all appeared in good condition.
Tested in garage with lights off. No arcing.
Disconnected leads one at a time from coil, when I disconnected cyl1 was a increase in misfire and stalled when removed leads for cyl 2/3
Marginal change in engine noise when disconnected and connected Cyl 4
When I disconnected HT at Cyl 1 can see strong spark between end of HT lead and coil, weak on cyl 4 but a spark.
Removed injectors and getting fuel from all four
Drove 100 miles to get a new coil back from eurocar parts (only one available on a Sunday) and it was wrong connector plug shape!
None of the local euro parts type places can get a coil for tomorrow.
Not been able to source any plugs in time for track day, no one has any stock these days.

No time to get to a garage before the track session so any ideas appreciated.

Thanks.

 

[STEVE.M]

I am getting a misfire, my car has been in the parked in the garage since last August. Have a track day on Tuesday so thought I better get it out to check it over and it's misfiring. I have checked the following:

No water in plug wells
Spark plugs are correct NGK R all appeared OK and less than 14k miles old
Plug 4 was more sooty and cleaned
Leads original renault and all appeared in good condition.
Tested in garage with lights off. No arcing.
Disconnected leads one at a time from coil, when I disconnected cyl1 was a increase in misfire and stalled when removed leads for cyl 2/3
Marginal change in engine noise when disconnected and connected Cyl 4
When I disconnected HT at Cyl 1 can see strong spark between end of HT lead and coil, weak on cyl 4 but a spark.
Removed injectors and getting fuel from all four
Drove 100 miles to get a new coil back from eurocar parts (only one available on a Sunday) and it was wrong connector plug shape!
None of the local euro parts type places can get a coil for tomorrow.
Not been able to source any plugs in time for track day, no one has any stock these days.

No time to get to a garage before the track session so any ideas appreciated.

Thanks.

Check the resistance of HT leads 1 & 4.
If one is higher than the other, the spark will take the easier route.
172/182 runs a dead spark system.

If no joy, swap 1 & 4 injectors.

 

[STEVE.M]

.

 

[15MAS]

It’s seems not only is my Clio not working neither is my multi meter, just been out to test and it’s not even showing the main battery voltage. I had tested the injectors by cranking when out against card board. Got four dots.