My zetec turbo will not idle at all and if I hold the revs at about 1500-2000rpm it runs for about 5 seconds then starts to miss fire and then dies, but when I drive it it runs ok? Any ideas what it could be

 

can you be a bit more specific on spec

 

im guessing maybe crank signal but as above wot spec is car

 

2.0 zetec silvertop engine, decompression plate, adapter kit to fit fiesta rs turbo inlet manifold, erst t3 and manifold, universal front mount intercooler, ofac management

 

Check inlet not leaking. Check pipe to map sensor. Decomp plate could be leaking.

 

hey mate mine did the same thing.. start it and just touch the throttle a tiny bit so it stays running and not cut out then let go after 5mins now it should stay runing? mine does it when cold basically i keep getting told that the cold start on it needs setting when going in to be mapped but it dont bother me because i start it and just wait in it till it warms up so stays runiing.chane plugs leads ec.mine leaked oil but was still fine it dont leak now tho

 

Have replaced all the gaskets on the inlet and used a smear off instant gasket on them so they shouldn't be leaking, but some times I can go out there and start it and it will tick over perfect and rev fine, but then I could go out there the next day and it won't tick over at all and if I hold it at about 2000 rpm it will stay there for about 5 seconds, then the revs will go up and down then it will start to miss fire then dies?

 

any one got any ideas ? really want to try fix this

 

Poor idling could be your ICV but misfiring will be something ignition or fueling related, MAP sensor, plugs, leads, coil pack, CPS, etc..

 

i dont have a icv but i never had one on my fiesta rs turbo and that idled fine once warm, the inlet manifold, all off the sensors loom and ecu all come off my efi engine which ran fine so i know they are good, brand new plugs and leads, if i unplug the water temp sensor the car runs alot better, if i plug it in it pops and bangs when i full throttle it so i think it might be running lean? because by unplugging it im guessing the ecu thinks the engine is cold so it is giving it more fuel?

 

borrow a mates ecu and try that if no luck water senseor that u unplugd must be the culprit

 

Yeah ok mate will try get hold off another ecu, checked for air leeks today and there is deffinatly none at all sprayed wd40 on every thing and made no difference

 

Also it wouldn't start earlier today, so took battery off and charged it put it back on it took ages to start was firing every now and again then it started so guessing its deffinatly a electrical fault somewhere

 

when at idle check the alternator is charging the battery, if it not this cause problems. should be around 13volts

 

Thats correct the ecu will make it run richer when this is unplugged, that would suggest to me that the ecu and wiring is fine and that the coolant temp sensor is at fault. What is the resistance of the coolant temp sensor?

 

just had a thought, are you using a zetec coolant temp sensor with cvh management? could be a different resistance range, although unlikley

 

Altenater is charging fine mate, no I'm using the cvh one I haven't got a multi meter I will have to take it to work and check it, what should the resistance be? Also I'm using a xr2i air temp sensor but apparently there not compatible with a fiesta rs turbo ecu?

 

22,000 ohms ish

 

Ok thanks mate will check it tomorrow and let you now what I get, but I still don't know why some times I can go out there and it will start straight away and tick over perfect and that that for about 2 mins then starts missing on tick over then starts running bad and other days it will will run bad straight from start up any one from the kent area want to come take a look and see what you think ill pay for petrol and that, just really want this fix as been trying to figure is out for ages now!

 

how do you know if its charging if you don't have a multimeter?

 

Beacause I used my mates one but hees on holiday at the moment so will have to use my one at work, was around 13.5 at 2500 rpm

 

right checked the resistance on the temp sensor and seemed fine, so tonight put it back together unplugged every electrical connection and cleaned put back on, then disconnected the battery for 30 mins to reset ecu, put battery back on and it started straight up and once warm idles perfectly now, but when i put my foot to the floor quick it bogs for a second then revs i got a video off it doing it what could be causing this? http://www.youtube.com/watch?v=I1H6ae8JgEE

 

had a similar fault with mine turned out to be a knackerd c0 pot!

 

or the acceleration enrichment needs bumped up in megasquirt

 

thats a point actually the little adjuster screw is seized on mine so i cant adjust it, do they still sell them?, im running fiesta rs turbo management mate, megasquirt i wish lol

 

hi, can i just ask what loom and ecu that yu used for it?? could i use standard zetec loom wit ofac ecu??thanks

 

hello mate, im using a xr2i engine loom with a ofac ecu no you couldnt use the zetec loom

 

worth checking map sensor and iscv are you still using the triangle speed sensor from gearbox? poor battery charge can give same faults

 

Map sensor is good it came off my old engine, not running a iscv and yeah am using the speed sensor, I'm pretty sure its the c0 pot but I can't find one anywhere ? Anyone selling one?

 

what inlet etc are yu using?

 

fiesta rs turbo with inlet adapter kit from ebay

 

nice 1 just hopin i didnt buy parts for nothin...do yu rekon the 1.8 or 2.0 zetec head fit the 1.6 zetec?

 

you manage to fix this im running ofab having same sort of problems i might try come to you and connect all my ecu n loom to ures to see what happens

 

Maybe its because your tryin to run a 2ltr zetec turbo with t3 turbo ect on a managment system that thinks its trying to run a 1.6 cvh with a t2 turbo?

 

As above and also..

XR2i loom wont work for Turbo application (OFAB/OFAC) without a re-wire and mods.
It must have a FRST ACT sensor.