Suspected cylinder not firing or maybe misfire V7 sti

[johnny5]

Ok was driving along then all of a sudden there was a sudden loss of power (not much but noticeable) parked up and the car was shaking its ass like Miley cyrus humming like it was a Veedub beetle which lead me to believe I could be running on 3 cylinders or misfiring.

Anyone had this problem before? as it happened suddenly I\'m assuming something may have come loose maybe wiring on an injector or coil plug wiring maybe the spark plugs could be farked (highly unlikely 10k old bosch platinum iridium spark plugs) not sure if it threw a code or not might have to get Pappu to check

[Guest]

Try unplugging each coil pack and see if ones makes no difference.

[Kiwi_Fozze]

get him to check the avcs position sensors too, actually, unplug your main harness plug and look for oil

[johnny5]

 kwi_fozze said:

get him to check the avcs position sensors too, actually, unplug your main harness plug and look for oil

I check that plug religiously bro have been in 1 of his cars when the avcs was playing up and it is kinda similar to that so might get him to check that to

[johnny5]

 evowrx said:

Try unplugging each coil pack and see if ones makes no difference.

was my next step to try tomoro when I get time

[Pappu1]

Hey bro unug each coil and see if makes a difference and Lso maybe check all injector plugs are tight

Is the cel on?

If none of the coils an injectors make a difference then could be the avcs issue like I had before

Hmm Also as an alternate test remove afm and start car and see if its any different just in case it\'s not 3 cylinders and just a badly/rough running due to afm/leaks

[D1Style]

 johnny5 said:

Ok was driving along then all of a sudden there was a sudden loss of power (not much but noticeable) parked up and the car was shaking its ass like Miley cyrus humming like it was a Veedub beetle which lead me to believe I could be running on 3 cylinders or misfiring.

Anyone had this problem before? as it happened suddenly I\'m assuming something may have come loose maybe wiring on an injector or coil plug wiring maybe the spark plugs could be farked (highly unlikely 10k old bosch platinum iridium spark plugs) not sure if it threw a code or not might have to get Pappu to check

I had the same thing happen to me 2 weeks ago but no CEL came on. dont know if yours would be the same fault but I needed to try as sort asap as its my only mode of transport, so went and got a scan tool plugged in and it came up with Cam position sensor. I pulled the front one out, cleaned it, disconnected battery and reset ecu and car has been running mint since. have ordered another sensor as a precaution so i can replace it, should arrive this week.

[johnny5]

 SP00N said:

Hey bro unug each coil and see if makes a difference and Lso maybe check all injector plugs are tight

Is the cel on?

If none of the coils an injectors make a difference then could be the avcs issue like I had before

Hmm Also as an alternate test remove afm and start car and see if its any different just in case it\'s not 3 cylinders and just a badly/rough running due to afm/leaks

cheers bro halfway through my checks will let you know I thinkit logged a CEL but mot sure if it came on

[johnny5]

 D1Style']

[quote name='johnny5 said:

Ok was driving along then all of a sudden there was a sudden loss of power (not much but noticeable) parked up and the car was shaking its ass like Miley cyrus humming like it was a Veedub beetle which lead me to believe I could be running on 3 cylinders or misfiring.

Anyone had this problem before? as it happened suddenly I\'m assuming something may have come loose maybe wiring on an injector or coil plug wiring maybe the spark plugs could be farked (highly unlikely 10k old bosch platinum iridium spark plugs) not sure if it threw a code or not might have to get Pappu to check

/quote]

I had the same thing happen to me 2 weeks ago but no CEL came on. dont know if yours would be the same fault but I needed to try as sort asap as its my only mode of transport, so went and got a scan tool plugged in and it came up with Cam position sensor. I pulled the front one out, cleaned it, disconnected battery and reset ecu and car has been running mint since. have ordered another sensor as a precaution so i can replace it, should arrive this week.

could very well be the same will give that a try cheers

[Pappu1]

U had a cam sensor code last time we Checked remember. But that should jerk at sort but running on 3 cylinder is totally different

Oh and might also pay to check plugs as have seen where the insulator cracks and then it goes not to fire properly

[johnny5]

kinda magically fixed itself but I think the it was the coil plug on the spark plug closest to the passenger headlight after i took it off then put it back to was fine very weird will run some codes when I see you bro

[Minaj]

Wow, this sounds like the same problem I'm having. I was driving near mission bay 2 days ago and the car suddenly lost power, it ran **** like it had a vacuum leak. I checked for vacuum leak and it's all sweet. I then opened the bonnet and sounded like it wasn't running on all four cylinders. I checked all the spark plugs they were ok, then I thought it might be a injector issue so I unplugged the injectors one at a time and the car would sound different except for cylinder 1. When I un plugged the injector for cylinder 1 it did nothing unlike the rest of the injectors where it did something. I changed the coil pack for cylinder 1 and changed the injector still the same issue. I did a compression check and the readings came 120 for the rest of the cylinders except for cylinder 1 which was 110 which I think is okay still in the range. The car didn't chuck any check lights.

Edited July 19, 2014 by Minaj

[johnny5]

Yup was a weird one bro but could be avcs advancement as well

[Minaj]

 johnny5 said:

Yup was a weird one bro but could be avcs advancement as well

I plugged in my standard ecu still same problem. Narrowed down the issue it's somewhere in the wiring because IAT isn't working either.