Our 2.0JTS is misfiring when under load, i.e hills or acceleration. When this happens the computer screen goes dim briefly & the engine warning light flashes. Yesterday I tried the 90 sec throttle reset & it ran perfectly afterwards revving cleanly thru the gears, today misfires again
My local garage have changed the plugs, cleaned the throttle body & run a diagnostic check to no avail, except a large bill.
Another mechanic I know has suggested a bad earth somewhere or HT leads breaking down.
My JTS Had similiar problems- coil packs- 3 of them in a year, all on separate occasions. It started with a faint misfire then went to 3 cylinders all of a sudden, you'll know about that when it happens !
About £60 a pop from stealers.
Jez get it on the examiner as some of the other systems in the car might give you a clue and it is ngk plugs as bosch plugs only work properly on motronic 1.7 and 2.7..... but were the modifications carried out when the lambdas were changed
I had same problem 6months back...2 new coil packs (10mins to fit) sorted it..
But get it on a diagnostic and find out which cylinder its missfiring..Then reset, swap coil pack over for a week,plug back into diagnostic to confirm fault coil pack then buy new..
good luck and enjoy once sorted
update - diagnostics have shown an intermittent misfire on 3 so the garage have swapped coil packs on 2 & 3 to see if it occurs on 2 next time. Needless to say its running perfectly at the moment
My 2.0JTS was mis-firing last year, and it took me ages to sort. It turned out to be a bad connection on the injection computer (on top of the n/s wing) - just removed the connectors and gave them a blast with WD40 and it was ok.
Sorry for my bad english, i am from holland i own an very nice 156 JTS TI
I also have a problem with my 156 JTS with returning misfires on cil3.
At the workshop is done so far,... complete head dismantle/ cleaning,... four new injectors one new coilpack on cilinder three,.... and new spark plugs, also compression tested and it was oke, and a part of the wiring was replaced.
one new lambda probe, and the first cat is replaced for a new one, it is all done under warranty.:thumbs:
But can someone tell me the location of the injection computer (on top of the n/s wing) ??
(picture maybe?)
I have exactly the same problem on my 2.0 JTS, it started a few weeks back, with a very occasional misfire under load, now it's happening a lot and this morning for the first time I had the warning message.
I want to fix myself if possible, but don;t have a diag cable, is there anything you suggest, or is it worth me taking to a garage to read diags or getting my own? Any instructions on making a cable anywhere?
Dave, cheers for this. I borrowed a cable from a colleague and downloaded the FiatECUScan software. Connected to car this morning and got the following: Misfires detected - Cylinder 1 misfire.
This weekend, I'll remove and clean and maybe swap with another to see if problem moves. Could anyone tell me how they are numbered, is it left to right for example? Fairly new to all this, but really want to learn to do stuff myself.
Also seem in other forums that the MAF can be at fault - anyone can tell me how to disconnect this temporarily?
Dave, cheers for this. I borrowed a cable from a colleague and downloaded the FiatECUScan software. Connected to car this morning and got the following: Misfires detected - Cylinder 1 misfire.
This weekend, I'll remove and clean and maybe swap with another to see if problem moves. Could anyone tell me how they are numbered, is it left to right for example? Fairly new to all this, but really want to learn to do stuff myself.
Also seem in other forums that the MAF can be at fault - anyone can tell me how to disconnect this temporarily?
no1 is at cam belt end and goes to 4 gearbox , youll probably find oil in plug well ,so clean it out and refit ,will probably fix your miss-fire:thumbs:
edit:::leave maf alone till misfire is sorted
OK, they weren't much help again saying it took them both... I went for a 14, but it looks way too big. I did notice someone must have topped the oil up messily at some point as there was quite a bit around the coil pack (only outside before you remove the pack). I visually checked the coil pack and it looked ok, cleaned up the oil off the top and then swapped coil packs 1 and 2. Still a bit jumpy, so will wait for the next warning now and then check which cylinder, hoping for 2, can then get a new coil pack. If 1, will go for new plugs and check the wiring. Thanks again for your help Dave.
Good news, after swapping coil packs, the fault now moved to cylinder 2, so will order a new coil pack today. Will update once fitted, thanks again for all the help on this.
OK, brand new coil pack arrived yesterday morning, fitted at lunchtime, now drives amazingly with not a single misfire to be found. Thanks Dave for all your help and thanks Smaky for the suggestion though hope that it won;t come to that now...
:thumbs:
A guy of squadra tuning was today at the alfa workshop, he told the most jtses have a bit problems wit little hikups at 900rpm reduce the sparkplug gap a bit wil help with that.
My problem of misfires could be an oil leak (problem occurs only with a cold engine, the will look at it.
A guy of squadria tuning was today at the alfa workshop, he told the most jtses have a bit problems wit little hikups at 900rpm reduce the sparkplug gap a bit wil help with that.
My problem of misfires could be an oil leak (problem occurs only with a cold engine, the will look at it.
mis fires from cold usually condensation making gap smaller on plug is just reducing resistance of spark jumping across gap so keep your gap as factory states and make sure ignition system is tip top and apply some dielectrical grease FORD do it stop same problems
So the lean burn and condensation can be a problem, when squadria remaps and disable the lean burn, she runs much smoother, also more horsepower and Torque at the middle revs.
To give it a treatment with the dieelectrical grease, wat are the best spots to apply it?
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