2.0 16v Si-Help needed

onslack · 12-09-2007, 07:18 PM

right this is doing my head in now

since day one of my 2.0 conversion my car's rev's hunt. i was told to replace the plugs and leads.

i replaced the plugs and leads for standard ford ones, i think replaced my iscv with a fairly clean second hand one, i also replaced the tps while i as there

the other day my car would run,but as soon as the rev's dropped it would cut out,i replaced the lambda sensor and the car started idling oki replaced the maf while i was at it

i then disconnected the water temp sensor that sends signals to the ecu and the car idles ok and the rev's stopped hunting

i replaced the water temp sensor(new one) today and the car still does it Confused , when i disconnect it ,it seems to idle ok but smells very rich

the battery has been off since 10.30am this morning and was reconnected at 5.30pm, so the ecu was reset

i dont know what else to try or to check

i couldn't feel any vacum leaks, a few weeks ago the breather hose under the coil pack was replaced

but it does sound like a "tuff tuff" noise coming from the engine when i switch it off, but not a clue where its coming from as it only me, and i can hear it when i am by the drivers seat

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Wardy257 · 12-09-2007, 07:48 PM

Do you have the correct ECU for the engine? Are all the sensors the correct sensors for the ECU?

onslack · 12-09-2007, 08:23 PM

yeah i am using a desk ecu as only 3 ecu's work, all my sensors are correct

boost mad · 12-09-2007, 09:11 PM

thinking about it.... could it be a badly adjusted TPS ?

onslack · 13-09-2007, 09:36 AM

hi alex

it could be, as i was talking to someone and they said that they didn't think the 1.6 TPS of the SI would work with a 2.0 throttle body

when my conversion was done a friend( or so called friend) did the inlet side while i was reconnecting read hoses etc. and i think he used the 1.6 TPS

i have a 2.0 TPS at home i will try that

Wardy257 · 13-09-2007, 05:10 PM

Unplug the MAF and see if it gets better.

onslack · 13-09-2007, 08:02 PM

i have tried unplugging the maf, it does nothing still does the same thing

Wardy257 · 13-09-2007, 08:21 PM

Very strange. I think you need to check your look over very carefully checking for chaffed wires, dirty conections etc. Continuity check all the sensor wire and volt drop each sensor and so on.

onslack · 14-09-2007, 12:16 PM

thank you again for your help, i will get some help with this as i dont have a clue

onslack · 18-09-2007, 12:34 PM

took it to a friend yesterday, hooked it up to thier diagnostic machine and it picked up my EGR which it would as i removed it

and it picked up that i am running lean at my lambda, so i am having my timing checked this week and going to hook it back up and see what it says

it seems to have stoppped hunting now and idles a little bit better

i think thr guy who did my inlet used the wrong gaskets, think he used the 2.0 inlet gasket with my rs1800 inlet so those will be getting replaced asap

so in short i am getting there slowly

just did my GF's 2.0 conversiob this weekend

http://www.fiesta-si.com/forum/viewtopic.php?t=8668

its runs sweet as a nut , so i'd best pull my finger out and get mine sorted

12-09-2007, 07:48 PM	#2
Wardy257 Too many posts.. I need a life!! Garage is empty, add now Trader Score: (0) Join Date: Aug 2006 Location: Lisbon Posts: 818 Rep Power: 6	Do you have the correct ECU for the engine? Are all the sensors the correct sensors for the ECU? __________________ If it's not sideways, it's not my way www.zetecescorts.bravehost.com

12-09-2007, 08:23 PM	#3
onslack PassionFord Regular Garage is empty, add now Trader Score: (2) Join Date: Apr 2005 Location: Location Posts: 412 Rep Power: 7	yeah i am using a desk ecu as only 3 ecu's work, all my sensors are correct __________________

12-09-2007, 09:11 PM	#4
boost mad PassionFord Post Whore!! Garage is empty, add now Trader Score: (7) Join Date: Sep 2004 Location: sussex Posts: 5,949 Rep Power: 13	thinking about it.... could it be a badly adjusted TPS ? __________________ cossies, making supercar owners look like cunts, since 1986

13-09-2007, 09:36 AM	#5
onslack PassionFord Regular Garage is empty, add now Trader Score: (2) Join Date: Apr 2005 Location: Location Posts: 412 Rep Power: 7	hi alex it could be, as i was talking to someone and they said that they didn't think the 1.6 TPS of the SI would work with a 2.0 throttle body when my conversion was done a friend( or so called friend) did the inlet side while i was reconnecting read hoses etc. and i think he used the 1.6 TPS i have a 2.0 TPS at home i will try that __________________

13-09-2007, 05:10 PM	#6
Wardy257 Too many posts.. I need a life!! Garage is empty, add now Trader Score: (0) Join Date: Aug 2006 Location: Lisbon Posts: 818 Rep Power: 6	Unplug the MAF and see if it gets better. __________________ If it's not sideways, it's not my way www.zetecescorts.bravehost.com

13-09-2007, 08:02 PM	#7
onslack PassionFord Regular Garage is empty, add now Trader Score: (2) Join Date: Apr 2005 Location: Location Posts: 412 Rep Power: 7	i have tried unplugging the maf, it does nothing still does the same thing __________________

13-09-2007, 08:21 PM	#8
Wardy257 Too many posts.. I need a life!! Garage is empty, add now Trader Score: (0) Join Date: Aug 2006 Location: Lisbon Posts: 818 Rep Power: 6	Very strange. I think you need to check your look over very carefully checking for chaffed wires, dirty conections etc. Continuity check all the sensor wire and volt drop each sensor and so on. __________________ If it's not sideways, it's not my way www.zetecescorts.bravehost.com

14-09-2007, 12:16 PM	#9
onslack PassionFord Regular Garage is empty, add now Trader Score: (2) Join Date: Apr 2005 Location: Location Posts: 412 Rep Power: 7	thank you again for your help, i will get some help with this as i dont have a clue __________________

18-09-2007, 12:34 PM	#10
onslack PassionFord Regular Garage is empty, add now Trader Score: (2) Join Date: Apr 2005 Location: Location Posts: 412 Rep Power: 7	took it to a friend yesterday, hooked it up to thier diagnostic machine and it picked up my EGR which it would as i removed it and it picked up that i am running lean at my lambda, so i am having my timing checked this week and going to hook it back up and see what it says it seems to have stoppped hunting now and idles a little bit better i think thr guy who did my inlet used the wrong gaskets, think he used the 2.0 inlet gasket with my rs1800 inlet so those will be getting replaced asap so in short i am getting there slowly just did my GF's 2.0 conversiob this weekend http://www.fiesta-si.com/forum/viewtopic.php?t=8668 its runs sweet as a nut , so i'd best pull my finger out and get mine sorted __________________

18-09-2007, 12:34 PM
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