Hello out there can anyone help me!!!

I have a sapphire 4x4 cosworth (91) witch runs fine in till iam driving down the road and it starts judering and missing at 1400-1500rpm. i was told it was the phase sensor so i replaced the phase/crank/air temp/coolant temp sensors and thought i fixed it but it hasnt???? also if i put my foot down hard its gets to 6000 rpm and cuts out then back fires and misses till i turn the engine off and back on again. i think these two problems a relaited but not sure?

PLEASE HELP ANYONE!!!!!

 

Did you try changing the spark plugs my car was doing something the same it was backfiring and missing I changed the plugs and had no bother since that was two years ago

 

i have new iridium tip plugs set at .8 also iv been playing about with the engine today and cleaned the crank sensor & regaping the phase sensor. it's idles lovely and the jurking @1400-1500 has stopped, (so far so good) i havnt revved it up to 6000rpm out on the road yet but i wil let you know if it has fixed it completely.



cheers Mike

 

Fingers crossed.

 

You could try cleaning the 3 multi plug connections on the bulk head.These can cause problems too.

 

Ok will do. Where can I find the 3 multi plugs?

 

At the back end of the engine, they're fixed to the black bulkhead panel in the engine bay.

 

Yo, I took the car out saturday evening with no joy it now sometimes judders @ 1600rpm and when giving it some beans it will cut out and backfire with my foot on the throttle??? I think it may be an ECU problem. Any more help would be appreciated. Cheers Mike

 

Hi again, iv cleaned all connectors & took the cossy out saturday with no joy it now juders @1600 & when I give it some beans the engine cuts out @5500-6000rpm and backfires when I put my foot on the throttle??? I think it might be the ECU causing a problem. Any help is appreciated. Cheers Mike

 

have you checked the Phase and Crank Sensor Gaps??? If you send me your address i will send you some useful info.....

 

If you do not floor it and just raise the rev slowly does it do the same thing? It could be the Spark Plugs... Do you have your old ones to troubleshoot it? What boost are you running?

 

Iv tried 4psi to 15 psi with no luck. I have new iridium tip plugs also Iv got ford 071 plugs (new) to try? The crank position gap is 0.63 & and phase gap is 0.20 when this problem happens it cuts the engine revs off then back on and backfires thou?

 

what ignition leads are you using

 

Standard ht's there old ones too. I'll get some new ones this weekend, motorsport ones or something like them

 

I had this problem with my 3 door, had a old rotor arm in the shed and thought i would try that, thinking it would be a waste of time and it cured my problem, the old rotor arm is still on there.

 

Iv had this problem since I bought the car, iv just been renewing things bit by bit. I have a group A coil and new rotor arm & dizzy cap new sensors & plugs. I'll try the old rotor arm tonight with the ford 071 plugs will let you all know soon.

 

Good luck, will be watching this.....

 

I have some lovely motor sport ones. Used but in very good clean nick. Ł45

 

Have you tried to read out the fault codes? There is a thread somewhere how to build one of those readers and the codes, but cant find it at the moment.

 

Are all the lugs intact on the crank pulley ?

 

www.bigturbo.co.uk/main6.htm

 

Yep got for lug, i ordered a new set of ht leads last night, should be getting them tomorrow or thursday. I think having the ECU tested for faults is next, does anyone know how much these things cost?

 

Testing for faults is the cheapest thing you can do! It is just a wire, an LED and a Switch. And it probably tells you what is wrong before you buy a lot of parts.

 

If the management light isn't on I don't think you will extract a code from it. Misfiring is common fault on cossies usually simple to fix. Most of the time it relates to phase and crank sensor, a weak spark causes loads of problems. I would disconnect every plug on the engine loom and clean them up and then double check phase and crank sensor gaps and position. After this cap, arm, coil and leads and plugs. But also check connections under dash by ecu as a couple of relays are under there, one for ignition other for fuel pump. Also have a look see if any play in distributor shaft, as this can play havoc on sensor gaps.

 

Ok cool, I'll have a look later tonight at the dizzy shaft etc, I have the new motorsport leads on. but have not had time to go out in it yet . I started it up and held the revs @1600 and it starts missing still?

 

Hello all.
I took the car out earlier with new 071 plugs & new leads, regaped the phase sensor with no joy. I did however test it putting my foot down slowly to 6000rpm out on the road and its runs fine. I think fuel pump/filter my be the problem? It still kangaroos @1600rpm thou?

 

I forgot to say! I checked the dizzy shaft & CPS all seams to be good & I have a new cap & rotor arm on there.

 

Indeed, a faulty fuel supply can cause some missfires! Had a fooked fuelpump that causes some missfire problems in my escos.
But as said before, do a fautcode test to make sure all is fine and go from there.

And as we talk about fuel delivery, is your pump wireing still standard?

 

Yep as fair as know its all standard, I had a quick look under the boot earlier and seen two units in a metal cage witch look a tad worse for wear. I will get it fault read first thou & like you said go from there.

Cheers

 

If there is still the old wireing under there, then I would it change anyway!!

 

Yes I think so. its all rusty looking, nothings been replaced as fair as I know.