Ok posted before but it's nothing that was recomended....basically.my saff is missing like mad, BUT she only misses when you are driving normally (if there is such a thing).

So if i leave her ticking over she is fine (sometimes lumpy but aren't they all), then if I take her for a drive she misses like mad - but stops wen i plant my foot to the floor, now its all well and good coz i luv planting my foot, but the 3 police cars ive past in the last 2 nights or so aren't going to appreciate it I dont think........I'm gonna book it in with Stu @ MSD im just a bit worried I mite do some damage driving all that way with it like this (3 quarters of an hr), so does anyone have any ideas.....PPPPPLLLLLLEEEEEEEAAASSEEEEEE

 

it sounds like a fueling problem like as if the fuel is at the rail and holding presuer and when you drive it hard the fuel presuer is increasing or it could be plugs lead phase sensor or at wores it could be some thing like is contamanting the plugs and would need head off

 

phase sensor in the dizzy?
tps sensor ?
poor contact in cap?
mapping issue ?
incorrect plug gaps (too big)?
the list is endless tbh . It comes down to trial and error with changing bits n bobs

 

Have u made any changes recently or round about when this started ?? when is the last time u changed plugs?

 

Had the plugs done at MSD, but had a new bottom end in since then.....it run fine for the first week or so then 1 day it wouldn't start changed the ECT sensor, and it started but then this prob with the missing started....my fella thinks it cud b the wiring to the ECT plug, but not sure how hard it is to change the wiring/plug.....

 

does the rev counter stay steady when it's missing, or does the reading get erratic?
If the Rev counter stays steady then it's a fuelling problem or HT problem (dist cap, leads, plugs). However, HT problem is unlikely if it behaves OK under load..
If the rev counter is all jumpy when it's misfiring, then it's likely to be a non- HT electrical issue - crank or phase sensor, poor earth connection on the ignition or ECU parts of the loom, ignition amplifier etc...

 

could be a set of leads too.

Had many a problem with my leads Kim.


Swap on at a time over with Andys set if he will let you.



Dave.

 

richm - my rev counter doesn't work - hasn't since i got the car lol


Dave mate - wud it be the leads if its not missing all of the time?

 

May be Kim, worth a try swapping things over.

Coil, leads, plugs,gap in plugs,dizzy cap,fuel pressure,bad earth somewhere,spark amplifier.

Could be any of the above but you have had some of the above done by Stu so should be all o.k.




Dave.

 

I giv up!

Cant afford to keep buying things for it - anyone want a saff.....

 

its proberly something really minor, its just finding out what it is thats the nightmare

 

I know hun, I just haven't the patience at the moment, it's one thing after another.....its getin worse and worse - gonna end up killing myself! When it annoys me I rag it all over.....then nearly crash coz im driving like a ****!!!!!


Sorry its a big winge day today........

 

IMO, if it's leads/plugs then it's likely to misfire under load which is where the HT components have to work hardest, which usually shows up the shortcomings..

 

Ok - I'm gonna go see if i can borrow sum leads from sum wer try that........thanks 4 your help guys!!!!

 

OK - took leads and dizzy cap off, put sum diff plug leads on, started running on 2 cylinders, so put the old leads back on still on 2 cylinders, 1 & 4 are dead but if you put a plug in the leads they are all sparking.......just took plugs out to clean em and number 1 was covered in oil......any ideas???

Also wen I put the ignition on (dont even have to start it) it backfires well loud!!!!!

 

Well 1 & 4 are firing again not sure wat we did though - just wiggled all the leads lol.....aw well its one for the experts me thinks.....

 

Got pretty similar problem with mine after yesterday.

Mine is sparking on all 4 but missing on idle, when you boot it it is o.k then.

Changed a few plugs etc....still missing on 2,4.

did find though when i unplug the injector plug on them there is no difference, unplug 1 and 3 the car nearly cuts out.

check if yours is doing the same.

think it is down to a sensor but not sure which one.

need to make a few phone calls 2morrow.



Dave.

 

Shes running now (for the min), but still misses wen ur driving her......ne mind.....

 

would it be worth sticking some injector cleaner in and running it through??

Can you make it misfire by revving it when its idling??? or is it only as your driving it??

 

Only when your driving it. Off boost it misses but it's ok when its boosting

 

Oh ye and ok when idleing even if u rev it

 

its your map sensor had the same problem try if not take it back to your tuner

 

I've totally given up tbh, tried messing with things yesterday and made it twice as bad, so off to MSD she will go................

 

have you tried the tps?

sounds like it could be this

 

That means nothing to me mate PMSL!!!!

 

Have you got RAC/AA recovery?! as u said its a long drive to stu and you wouldnt wanna melt the engine driving that far Prob better off getting it recovered to his if u have or borrow a mates if you havnt got it

 

you really won't melt anything driving off-boost, but the fuel bill will obviously be less on the back of a truck..

 

I've been driving it for a week or so like this now - tried it down the motorway yesterday, and its cool on there, it seems to get better the faster you are going - strange!!!!! - will have to just take it easy - my fellas coming with me and he is with AA so if worst comes to the worst.....im covered


Just booked it in with Stu going down tomorrow so fingers crossed all will be ok.....

 

Cool hope u get it sorted

Just from experiance if theres a prob and it needs to go to a tuners i'll always get it recovered, cant afford for any more engines to go pop when i get my new saph

 

Tell me about it, put Ł20 in yesterday, got 35 mile to about Ł15 of that lol.....aw well - prob cost me a full tank of petrol, but as long as she gets there.... She seems worse wen its not on boost, she misses like mad - but wen you bring the boost in she's fine

 

So do I mate.......only had her a month already had a Ł500 tune up and a bottom end - so if the engine does go pop on the way down - I'll be driving a fiesta popular plus or sumat for the next year lol

 

the tps is the throttle position sensor

when these f*ck up it makes the splutter and hesitate

my mates old saff had a didgy tps on it and it drove fine on boost, but would idle all over the place and hesitate and splutter when driving slowly at low revs

its really easy to change, its the part by the throttle, cant remeber what colour it is but you cant miss it

http://search.ebay.co.uk/cosworth-throttle_W0QQfltZ9

hope this helps. and it may save a journey

 

Will have a look at this later thanks mate