Missfire under load

andrew880 · Feb 21, 2017

Hi guys wonder if someone could belp me here
I have an 02 plate 172 it developed a mossfire over night a couple days ago and was there for a couple days then went away but came back again yesterday i have already changed the coil pack and leads and the plugs havent been in the car for very long any ideas would be appreciated

STEVE.M · Feb 21, 2017

andrew880 said:
Hi guys wonder if someone could belp me here
I have an 02 plate 172 it developed a mossfire over night a couple days ago and was there for a couple days then went away but came back again yesterday i have already changed the coil pack and leads and the plugs havent been in the car for very long any ideas would be appreciated

Did you fit the recommended PFR6E-10 NGK Platinum plugs?

andrew880 · Feb 21, 2017

STEVE.M said:
Did you fit the recommended PFR6E-10 NGK Platinum plugs?

I cant remember of the top of my head i remember they were the long life ones but not sure if they were ngk or not

R3k1355 · Feb 21, 2017

Do you get any warning lights on the dash when it misfires?
Injectors are another possibility.

STEVE.M · Feb 21, 2017

andrew880 said:
I cant remember of the top of my head i remember they were the long life ones but not sure if they were ngk or not

If their not, that`s likely to be your problem.

andrew880 · Feb 21, 2017

R3k1355 said:
Do you get any warning lights on the dash when it misfires?
Injectors are another possibility.

The E/M light flashes when missfiring and the service light cmae on last night which im guessing is to do with the missfire

Rojer · Feb 21, 2017

Sounds like injector then.

andrew880 · Feb 21, 2017

Rojer said:
Sounds like injector then.

How do i test the injectors to find out which one is faulty or am i best just to replace all 4

Rojer · Feb 21, 2017

Best way to do it is plug in a code reader, they are relatively cheap at £25/30 each, but don't replace them before you have checked the plugs first and plugged it in.

andrew880 · Feb 21, 2017

Rojer said:
Best way to do it is plug in a code reader, they are relatively cheap at £25/30 each, but don't replace them before you have checked the plugs first and plugged it in.

Okay cheers will take the plugs out and check them the car has always had a rough idle though i know there meant to but mines osnt great but will get it plugges in and see what it says thanks for the help

Rojer · Feb 21, 2017

No problem, let us know what the outcome is.

KitsonRis · Feb 21, 2017

Another way of checking is to un plug an injector while the car is running and if it gets worse and goes to 2 cylinders then that injector is OK. If there is no change then that injector is at fault.

Renparts on eBay do new genuine injectors for ~£35 each (or they did when I bought them last summer). What I would do is change all four anyway if they haven't been done before. Doing all four of mine along with a new coil pack and HT leads did make a difference to how the car drove.

Coops Mk1 · Feb 22, 2017

as above, easiest check is just to unplug each injector in turn and listen to engine note change, no change = fubar injector

STEVE.M · Feb 22, 2017

Coops Turbo said:
no change = fubar injector

Or an ECU or wiring fault.

Coops Mk1 · Feb 22, 2017

on the off chance perhaps, but 10 times out of 10 for me its been injector

andrew880 · Feb 26, 2017

Just an update on the problem git the car plugged in to find out what injector had gone and it said number 3 has gone so just waiting on new ones coming and gonna replave all 4 as the injectors have been on from new. Thanks for the help guys

Search

Search

Missfire under load

andrew880

STEVE.M

andrew880

R3k1355

Absolute wetter.

STEVE.M

andrew880

Rojer

andrew880

Rojer

andrew880

Rojer

KitsonRis

Coops Mk1

STEVE.M

Coops Mk1

andrew880

Similar threads