C200k 1.8 271 engine

[Doo-da]

New memeber saying hi with a question for the techs on here..

Just aqquired a 53plate c200 k 1.8 with a misfire, was too cheap to let it slip away in all honesty...

History of the car is,one owner, serviced on time by the same garage since new, with oe parts , cost hasnt been an issue until now.,

Has run fine for its 164k miles, until 3 weeks ago.

The car starts on the button and runs perfect until warm, then the misfire appears, ticks over sweet, but under load it misfires on cyl 1 .

Parts fitted to try to cure it before i bought it are

4x new bosch coil packs
new plugs
New upstream llambda sensor
new Breather hose from block to inlet man

Throttle body has been cleaned out, and an inlet cleaner run thru whilst running.
Theres no traces of oil in the loom at all.

Only 2 codes stored are misfire on cyl 1 and mixture adaption limits reached

ANy ideas guys


daz

 

[Cole@MBS]

Sticking valve in the head, was such a big problem when this engine first come out. Still on going to this day!! Head rebuild is the only cure........

 

[Doo-da]

OOh... not what i wanted to hear,,, what sort of job is taking the heads off on these.

Very confident in doin it myself , new chain requiered aswell?... and whats required to be done to the head, just a regrind of the valves or new guides, seats cut?

daz

 

[Steve@Avantgarde]

Also stretched timing chain will cause this fault and another very common issue, did one friday.

 

[Doo-da]

Its fine when cold which is whats throwing me.

 

[Steve@Avantgarde]

1 test to do is to take off the rocker cover and time it up. If its bang on then its what Cole said for sure.

 

[Doo-da]

Thanks for the replys guys...

Is it much of a job to time these up?. never had to do a chain before, but done loads of cambelts on other cars....

 

[Steve@Avantgarde]

No its easy, remove the rocker cover first of all, there is a mark on each camshaft which lines up with mark on the sprockets the crank times up with a mark on the timing cover with OT on the crank pulley.

There is a locking tool that locks the cams but you wont need it to check the timing marks.

 

[Doo-da]

JOb for the weekend then. will report back with my findings...

Do these suffer with injector problems at all as a guy at a local garage says he has had the same sypmtoms on other cars and it was blocked injectors..

 

[Steve@Avantgarde]

Never seen one with a failing injector. Stretched chains and sticking valves are par for the course on these engines.

 

[Doo-da]

Thanks again