Right got a perminant missfire .......

Cylinders 1,2 and 4 are 100% fine

Fault is on number 3 cylinder....

Disconnect HT lead makes no difference.

Got a good spark.
Got fuel (had injector out while cranking and ge ta good spray of fuel)
Got good compression.
Rockers are both ok on head.

But doesn't fire on that cylinder

any help much apreciated

 

Sounds like my cossie when a head i got had a problem!! Turned out when the bloke i bought it off got it checked there were 2 loose valve guides in it!!! Which was making it loose compression and only run on 3 cylinders.

 

U checked it aint some thing silly like the lead or spark plug. you never know u may be lucky.

 

Checked them

 

Worth checking the cam............even if you have good compression the cam may be fooked

 

How did the fault start, was it ok one day and then just appeared, or was I after hard abuse, or engine rebuild,etc.

CheeRS

Steve

 

Air Leak ? test engine comprestions.

 

mmm. Does the miss fire clear when you rev it??

 

Compression all fine.
Misfire all the time.
Bought the car like it.

Just doen't do anything on cylinder number 3 even tho it has fuel and a spark....weird

 

also .....

No air leaks and cam is fine

 

I think your gonna have to have the head of just to check. Ok it'll cost ya in bits. but u have done the things which I would try. Ok your getting a good compression, but if there is fuel being dumped into the bore and for some reason it is not firing, then the fuel will increase the figures you are given on the compression gauge.

 

bent or burnt valve

 

Does it rattle a bit Steve? If so, swop the followers from No:1 to No:3, they may be knackered.

 

have the followers still ot oil in them if the car hasn't been run for a long time, try squeezing the oil out of them and check if there worn underneath. if there full of oil have pressed so the oil is all out, so they will fil up when u start, if there already full sometimes they have difficulty as stu said if there worn items.

cheers

 

Book it in we will have a look for ya

 

Sorted now guys......Cheers to Karl Norris for the hand while he was here picking up some of my Cossie bits ......

 

Tell us waut the problem was then.

 

metering head