How to diagnose a rough running Ford Falcon

In this video I walk through how I diagnosed a rough running Falcon and the issues I ran into along the way. The error code P0356 appeared on my diagnostic tool. From there it was all about eliminating everything until I found the source of what was causing the issue.

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Please note: I am not a qualified mechanic, I just enjoy working on cars in my spare time and I want to bring you along on my journey. Modaufy Garage assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. All cars are different and what works for me, might not work for you. Working in or around cars can be dangerous so if in doubt talk to a qualified mechanic. Just remember to be safe at all times.

[LittlealxYT]

This is such a good video. Although you get little for it, I wanted to say thank you, this really helped me. My BF Falcon has started doing a similar thing, and i'm now able to investigate it properly before getting told stories by a mechanic whom may not be familiar with the issue

[iwillnotcomply]

thanks mate I did the same intake manifold gasket

[brandonshuttleworth]

Thanks mate just going through the same thing atm, new coils spark plugs and fuel injectors and still missing so going to look at the gasket next 😂

[connor]

Great video mate
Thank you very much
You covered all bases to help me a non mechanic
Cheers 👍🏻

[asiq]

if your idle is missing at a consistent rate you can tap the top of throttle body with your knukles continiously if more or all cylinders fire it is most likely gunk on your tmap sensor or problem with tmap sensor/wireing (pretty much maf sensor).

[AH-kyxb]

I have a rough idle when stopped (brake pressed, in drive), my rpms are stable, but my car just vibrates a lot. I have put new spark plugs, checked coils, did smoke test, changed one leaking fuel injector (that I thought was leaking) and its orings. I still get rough idle and my long term fuel trim is -25% in Park, and -12.5% when in drive and stopped. I am guessing my fuel injectors are not spraying properly or leaking. Will have to change those.

[T-fv]

I can hear air sucking in at cylinder 1 right where the intake manifold meets the head, sprayed some aerostart and idle dropped, I've got high idle, and fuel economy is getting worse, I guess the gasket is cactus.

[DanHickey-qs]

Heres one got bf falcon gas ...in morning drive for 20 mins get a miss and loss off power has stopped come back 5 min starts drives fine ...codes say cam sensor l replaced them ran fine for week problem came back any ideas

[simonmears]

Leaking manifold gasket putting more air in lean mixture trip a code ecu trys to compensate riching up fuel trim so will o2 sensor a little bit of knowledge is dangerous its fun to diagnose engine problems 😮

[robertprior]

Iniector pulse on cyclinders 2 and 4 fades out after 10 seconds of running . Any ideas. BA Falcon

[julianalderson]

It runs great now but. Does not like start again. Goes but should just startn go. Thanks

[julianalderson]

Mines lpg runs nice. First start up great. But if at garage turn off then on doesnt start well. If know thanks

[stevanzaharic]

Definitly your problem will be solved when you change spark plugs 6 gaskets and 2 VCT valve gasket on rock cover and it will prevent leaking oil in spark plug well.Make sure to puchase rock cover gasket kit from Ford, because aftemarket is not good and after short time rubber and seals will be hard and leakage in spark plug well will be again.Inatake gasket is from paper and usually they breake on clynder number 1 and if your idle were hight in park or neutral over 800rpm definitly vacum leakage is problem.Test for vacum leakage can be done from home made smoke detector easy to make or 1 metre hose you conect on brake buster and close trotle body hole with plastic gloves and buy one big cigaros and push smoke in true hose and if you have vacum leakage smoke will come out on damage part like gasket, O rings injector or other conection.Before changing rock cover gasket tray lock more top rock cover bolts and maybe you will prevent leakage on clynder number 1.2.3.

[Australia-bixd]

I have my fg ford xr6 turbo I scan the Car new spark, plugs, new coil, fuel, filter, new and clean the throttle body cleaned. Everything steal the Car vibrate at the top help plz and also, I checked the engine mount

[SamSam-wrwg]

I got the same problem I changed the spark plugs and the coils and the fuel filter and the oil sensor and clean the throttle body and use a fuel injection system cleaner and removed the air filter then installed a new one
i got a small leak from the muffler so I thought it could be the problem so I installed a straight pipe and still I got rough idle when stopped and on drive and it’s going with me for the last 20k so I will try what you did if it works I’ll edit my comment

[julianalderson]

Yer mines lpg wagan factory. It starts then wants to stop. Have had mechanic do new points plugs and battery, runs nice when goin but after start shitty. Gettin ignition done next week hope helps. otherwise im f...ked, thanks

[paulzytsel]

IN THIS CASE A WASTE OF TIME AND MONEY SWAPPING OUT THE COILS, THERE HAS TO BE A WAY OF CHECKING THEM.

[julianalderson]

Its not the points or motor think more the lpg is buildin up.