FORD FOCUS P0301 is a throttle body problem

[andybaz]

Now, im expecting a full list of views on this one .
FORD FOCUS - 2004 - 2.0 16v dohc - zetec.
Sinlge coil pack with 4 leads to each plug - MISFIRING
RAC was 1st called out, said fault was coil pack, customer replaced.

I went to it, eobd read it & manufacture read it - p0301 ( we all no what this is), went back following night:
removed leads- carried out spark test - good
removed plugs - compression check , ford start their threads low down in the hole, so had to forcably hold gauge in hole, cranked - NO COMPRESSION no 1, spin over for 20 sec, tried 2,3&4, got compression - blew my tool out, retried NO 1, no compression - so misife no 1 cylinder is correct. I advise on head investigation possible removal.

Some on has been out after me and said, if i set my machine up right it should have read p2135 and NOT p0301 .

Seemingly this is a common known problem, ford garages charge for head work at ££££££££ and simply replace the throttle body and she's as good as new, now there's a lot of profit in that job wouldnt you say ?.

This car is throttle cable and NOT FLY BY WIRE, the throttle body is a simple plastic body screwed via 4 screws onto a plastic inlet manifold and houses a simply butterfly to control ammount of air, forgive me for being thick, back to basics, this body controls the air into the 4 branch plastic manifold, AND THIS IS CAUSING THE MISFIRE on cylinders 1 & 2 (been out tonight and it now shows p0302 aswell).

This other person who has been out to car removed rocker cover, said valves open and close correct - and not sticking, checked for wet staining and plumes of smoke out of exhaust - none, oil level seems ok.

So no compression on NO 1 cylinder - throttle body ? - like to know what your views are people, i find it hard to believe a throttle body can be the cause of no compression and naughty if ford hide this sympton under code p0301.

Right i wearing a wet suit an hard hat ready for all insults and rotten veg throwing

[markt]

ha
if theyre like the ones we get looked at after us then its the bloke down the pub who looked at it the other night while they were playing pool.lol
we simply let them get stung by them..then stung by us when they bring it back for us to fix because its still not righ t
valves opening and closing correctly...thats tells you the gasket is ok or the piston doesnt have a hole in it..i will have to apply these skills when i get back to work.

[hefaus]

Cylinder miss

ha
if theyre like the ones we get looked at after us then its the bloke down the pub who looked at it the other night while they were playing pool.lol
we simply let them get stung by them..then stung by us when they bring it back for us to fix because its still not righ t
valves opening and closing correctly...thats tells you the gasket is ok or the piston doesnt have a hole in it..i will have to apply these skills when i get back to work.

Hi Andybaz.
Why not try a cylinder leak down test? I am sure you will find the problem if there is one in that cylinder. Sounds like a solution to the no compression reading. Basic train of thought is necessary Hth . Keep Smiling

[andybaz]

And to think, if you pop along to my place tomorrow you will see me with a 2lt diesel unit on the floor replacing piston an rings, can do them in my sleep, probably talk you through each nut an bolt over a pint , i even had to draw a little pic for my client for him to understand,wish i had some crayons, then i showed him the throttle body aswell, you see i take the time to fully explain and if i dont know, i tell them, honesty all the way, he then turned round and said this other guy was a fitter, any way , be interesting to see what other views come back , back to primary school for me