BigErn

Bought a 2wd Sapph cos on Tuesday and when driving home from work today it dropped on to 3 cylinders.

It runs fine under full throttle in a straight line but on 3 at light throttle and low revs. If you corner right it runs fine but corner left it will drop on to 3 again. I had a quick look at the plug leads (first thought) and they seem fine, never had a proper look into it cos its cold and wet outside and I cant be arsed to be out in the street covered in oil tonight. Anyone had this problem before or have some idea as to what it could be?

Thanks in advance.

Rex Kramer

iTrader: (1)

how much fuel is in it when it runs on 3?

BigErn

I just put 30 quid in it

Rex Kramer

iTrader: (1)

mmm thought it might have been the tank vents

Dicko&Vacant

iTrader: (3)

ern that was what mine was like but only round corners etc not in straight line before getting it set up etc last wk was due to not getting enough fuel running lean as fcuk lol or just try the easy things 1st like a set of plugs etc.

fordsportjay

iTrader: (6)

when was it last serviced....
give it agood service,phase sensor,leads,cap rotor arm,fuel filter,plugs.
check all connections on injectors.

does it run on 4 on tickover?

sure it will be something silly

BigErn

Its had no bother in the 300 odd mile I done in it up to now. Just wondered if there may be a sensor with a loose connection or somethin similar that could cause it?

I did flick the arse end out about a minute before it started acting up.

The inertia switch cant only half trip can it?

BigErn

It was fully serviced about 400 mile ago, got the stamp in the service book.

fordsportjay

iTrader: (6)

ive had bad connections on the top of the spark plugs in the past.

if its running rough on tickover,pull off each lead one at a time to see which cylinder has the problem.

BigErn

Been round the full engine bay checking making sure all connention plugs are on well. Cheked the ignition leads, they fine too. Spark plugs have a really big gap which will be attended to shortly when I can get a lend of some feela blades. The car idles fine on tickover (most of the time) miss fires at really low revs and light throttle but runs fine when its under heavy throttle and boost.

Wondering if it may be plug gap, but surely that would be the opposite? Run ok at low revs but miss under boost?

Starting to do my head in now.

aduz

welcome to the world of cossy ownership

rapidcossie

sounds like it might be overfueling..

best to spend some cash and get a PROPER set up at a good roling road(not just your local garage)

this will save you lots of hassle and heartache in the long run.

BigErn

[/quote]welcome to the world of cossy ownership

BigErn

Yeah I forgot how much fun owning a Cossy could be


I think its overfuelling like a right bastard too, big clouds of black smoke when it drops to 3. Smells really rich

rapidcossie

maybe a faulty map sensor or connectin to the map sensor...would explain why it did it ubder certain condtions ie going round corners etc etc

rabmc

Shit !

What about this , bought my 3 door about 2 months ago if that , drove out the guys street an dropped to 3 vooomit !!!!! limped her home shitting myself !

Changed plugs/cap/rotor arm/leads and it cured it pfffeww !

Part and parcel !

hope is easy fixed

JTECH James

iTrader: (13)

could it be rocker cover, filled the plug holes up with oil when you corner it shorts out?

discodenkelly

could have a point there, mine did it years ago, shite rocker gasket leaked oil into the plug space and it went down to 2/3 occasionally. Took me weeks to sort it out, changed everyting else until i noticed

JTECH James

iTrader: (13)

rabmc

Yep happened to me too , rocker gasket , or lack of , was getting a miss-fire here and there , and accidently found the problem !

BigErn

Im pulling the plugs out in a bit to re gap them and Ill check for oil on them. Cheers

BigErn

Not nice, bet it pissed you off something rotten?

Hope mine is something so simple, just had all new ones on tho.

discodenkelly

Was a right pain in the arse at the time. Never fit a non Ford rocker gasket, they leak
If there is oil around the collar of the plug then it will probably be the problem, if not then I think you need to get it diagnosed by a pro if everything else has been changed

BigErn

DISCODENKELLY
Do you know anywhere up in North East where I can get it done tomorrow?

discodenkelly

Not on a Sunday pal, I only ever took mine to Stu at MSD in Blackpool or Pete Slights in York. neither work a Sunday. Someone else on here might know somewhere though

BigErn

Well I re gapped the plugs, no better.

Its number 4 its dropping. I found it idles ok but if you stand on the sill and bounce the car it will drop to 3 cylinders till a few seconds after you stop bouncing.

This is really doing my bonce in now!!!!!

Can see me sending it to a garage on Monday cos Im fookin sick, just wanna play in my new toy not fart about on the drive in the dark.

JTECH James

iTrader: (13)

plug lead rubbed through somewhere?

BigErn

Thought it may have been the lead arcing out on the inlet manifold where it goes on the dizzy, this was a recurrent problem on my last one. Couldnt see anything but wrapped it in insulating tape nevertheless, still no better. Leads are only a few weeks old too.

SteveB

iTrader: (3)

How old does the fuel filter look?? In the past I've seen some filters look so old they are seriously corroded!!!

Dicko&Vacant

iTrader: (3)

could the wiring to number 4 injector be faulty or have a break in it etc me mate bought a cossie not to long back and had the same sort of problem. found it was injector wiring rewired and now fine

BigErn

Goona have a look at injector wiring in the morning.

Just had to use it to take my girlfriend home, cos its pissin down and theres no chance of gettin a taxi at 1am on Sat night/Sun morn, and I noticed its not running its normal vacuum. Its a bit less than normal, could this be caused by a vac leak or is it just cos its only running on 3? Wonder if its disturbed a loose pipe when I put it sideways? Suppose it would explain why it runs shit until its in boost too.

Gonna go round all vac and boost pipes making sure thet all tight and leak free.

Fingers crossed

jake-cos

iTrader: (4)

I'd try the map sensor.
mine did exactly the same thing at lightwater valley RS show,
proper ruined my day!!

took the connector of and gave the connections a clean and bobs your mothers brother!
back to running sweet as a nut!!!

sounds like the same problem, seems to be running on 3 and chucks loads o fuel through the exhaust.

worth a try, hope you get it sorted mate!

BigErn

Cool, Ill give that a bash too.

Think I saw the vac pipe for the map sensor, where it goes on to plenum was possibly loose too.

biscuittin

i had a 2wd saff when i went sideways in it used to drop onto 3 cylinders
it was the phase sensor in the dizzy !!!
took the cap off and just touched the wires it fell to bits

BigErn

Cheked all vac pipes, they all ok.

Cheked MAP sensor connections, they fine.

Checked phase sensor, thats new too.

Im going to cry soon!!

Alvyn

iTrader: (1)

check the crank sensor gap and also check that the crank pulley is tight!

BigErn

Do you know what the gap should be Alvyn mate?

rabmc

I feel your pain big ern ! Its like pissing in the wind sometimes
I need to go out and fix a niggly problem , ither the battery or alternator/bad earth or whatever , but its pising down and i really cant be aRSed at the moment

Hope you get it fixed soon

Alvyn

iTrader: (1)

gap between lug and sensor should be between 0.6-1mm

PeterLucas

Mine ran on 3 at tick over, but if reved it was ok.

Turned out to be a burnt out exhaust valve.

Do a compression test mate.

Good luck