Hi my 2003 316ti won't start petrol in cylinder 2 changed plugs and coils won't start but cranks please help xx

Hi
Is the TT Diesel or Petrol/Gasoline ? If its Petrol/Gasoline I would check/change the spark plugs, if its Diesel I would put an injector cleaner through it.
I hope this helps Nick

you have changed all the electronics but that is half the problem
misfires are from low fuel pressure , faulty injectors/tips , wiring to the injectors and ECM

Check your PCM fuse

could be petrol out water in petrol

Trouble Code: P0300

Multiple Cylinder Misfire Detected
Possible Causes:


Air leak in the intake manifold, or in the EGR or EVAP system Base engine mechanical fault that affects two or more cylinders Erratic or interrupted CKP or CMP Sensor signals Fuel delivery component fault that affects two or more cylinders (i.e., a contaminated, dirty or sticking fuel injector)

Trouble Code: P0302

Cylinder 1-10 Misfire Detected
Possible Causes:


Air leak in the intake manifold, or in the EGR or EVAP system Base engine mechanical fault that affects only one cylinder Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)

Trouble Code: P0305

Cylinder 1-10 Misfire Detected
Possible Causes:


Air leak in the intake manifold, or in the EGR or EVAP system Base engine mechanical fault that affects only one cylinder Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)

Trouble Code: P0351

Ignition Coil No. 1, 2 or 3 Primary Circuit
Possible Causes:


ASD relay power circuit to the ignition coil is open Ignition Coil No. 1, 2 or 3 primary "driver" circuit open or grounded Ignition Coil No. 1, 2 or 3 is damaged or it has failed

Trouble Code: P0352

Ignition Coil No. 1-8 Primary Circuit
Possible Causes:


ASD relay power circuit to the ignition coil is open Ignition coil primary "driver" circuit open or grounded

Trouble Code: P0353

Ignition Coil No. 1-8 Primary Circuit
Possible Causes:


ASD relay power circuit to the ignition coil is open Ignition coil primary "driver" circuit open or grounded Ignition coil is damaged or it has failed PCM has failed Ignition coil is damaged or it has failed PCM has failedPCM has failed Ignition system problem (coil or plug) in only one cylinder Ignition system problem (coil or plug) in only one cylinder Ignition system problem (coil or plug) in two or more cylinders Vehicle driven with low fuel pressure or while very low on fuel

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Hi

P0305 is misfire in cylinder #5.
P0306 is misfire in cylinder#6.
P0316 is misfire on start up.
Have the plugs on those 2 cylinders, and the 2 fuel injectors checked, also check for spark from the coil on those 2 plug wires.

Please get back to us if you have further query or else please accept the solution.

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Check the crank position sensor. Had alot of irratic misfire and starting issues related to that little guy.

I would suggest taking out ALL the plugs. The engine will turn over much faster and not drain the battery. You may find that the fuel in the engine has become diluted with water. This turning over without plugs will do a couple of things: a)free up and lubricate everything.
b) give the fuel pump the greatest chance of getting fuel through to the cylinders, c) purge some stale fuel out of the engine. You should be able to smell petrol vapour once it's coming through, albeit feintly.
c)Give you chance to check the spark on each plug.
NOTE THE LOCATION OF EACH PLUG LEAD! If these get swapped round, it will never start until they are corrected!

Fine, do you have spark all the way to the plugs? What is the fuel pressure must be AT LEAST 42 PSI as soon as you turn on the ignition
You didn't mention the ignition module
Check the engine cranking Vacuum it needs to be at least 2" cranking if not the catalytic converters can be so plugged the engine can't start YES IT IS VERY POSSIBLE HAPPENS ALL THE TIME
The other reason you may not have 2" of cranking vacuum would be a jumped timing chain also check the compression look for any low cylinders add some ennginen oil to those low cylinders and if they do not come way up right away you have valve problems.
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